Search

Search Results

• 1. [Article] Habitat management for beneficial insects on Willamette Valley vegetable and berry farms

  Conservation biological control involves manipulating farm landscapes or management systems to enhance populations of beneficial predators of agricultural pests. Farmscaping is one aspect of conservation ...

  Citation × Citation Citation Abstract Copy Title: Habitat management for beneficial insects on Willamette Valley vegetable and berry farms Author: Russell, Michael C. Conservation biological control involves manipulating farm landscapes or management systems to enhance populations of beneficial predators of agricultural pests. Farmscaping is one aspect of conservation biological control where predators of important pests are identified, the availability on the farm landscape of resources and habitat components needed by the beneficials to complete their lifecycles is evaluated, and hedgerows, beetle banks, or other conservation plantings can be added to the landscape to provide the lacking resources. To be able to efficiently survey a farm landscape for the presence of resources that support beneficial predator populations there needs to be information on the resource availability with different habitats. This dissertation describes a series of investigations into determining the amount of resources available in particular habitat types, and how to create conservation plantings which provide these resources with minimal expense and impact on the farming system. The first investigation is into the floral resource availability to parasitoid wasps in cane berry production landscapes. A meta analysis was performed to estimate the effects of different species on longevity of and attraction to various flowers. This information was then used to evaluate the plant species found on Willamette valley cane berry farms and calculate the total floral resource availability of different habitats during different times of the year. Surveys identified particular habitats on the landscape, and different management regimes as having high floral resource availability relative to other habitats or management regimes. The second investigation focuses on the biology of a group of ground beetles that are common on Willamette valley vegetable farms. Pitfall trapping and soil core samples were used to determine the seasonal activity patterns of the carabids, and to identify which habitats they were using most. Sentinel prey cards were used to compare pitfall trap counts with the risk of predation of a potential prey item. Laboratory experiments identified differences in the feeding and activity of different species, and the changes over the season. The third investigation used soil cores to sample the over wintering arthropod predator populations in a variety of habitats on Willamette valley farms, and in plantings of native species on beetle banks in a common garden at the Hyslop research farm in Corvallis, Oregon. Grassy habitats were found to support the highest arthropod populations both on the farms and in the common garden. Some perennial forbs also had high arthropod numbers, while other perennial forbs and annual forbs had low numbers. Differences in the number of over wintering arthropods in different species were related with differences in the structure and composition of the vegetation. The information presented here can be used to assign value to different habitats based on the provision of specific resources required for beneficial predators to complete their life cycles. This will aid in rapid evaluations of farm landscapes based on aerial imagery interpretation or a quick tour. After initial predictions are made it is easier to conduct more in depth sampling to confirm whether the beneficials are in fact present and thriving. If there are resources that are in too short a supply the information provided here will help in designing conservation plantings to provide those resources. Title: Habitat management for beneficial insects on Willamette Valley vegetable and berry farms Author: Russell, Michael C. Conservation biological control involves manipulating farm landscapes or management systems to enhance populations of beneficial predators of agricultural pests. Farmscaping is one aspect of conservation biological control where predators of important pests are identified, the availability on the farm landscape of resources and habitat components needed by the beneficials to complete their lifecycles is evaluated, and hedgerows, beetle banks, or other conservation plantings can be added to the landscape to provide the lacking resources. To be able to efficiently survey a farm landscape for the presence of resources that support beneficial predator populations there needs to be information on the resource availability with different habitats. This dissertation describes a series of investigations into determining the amount of resources available in particular habitat types, and how to create conservation plantings which provide these resources with minimal expense and impact on the farming system. The first investigation is into the floral resource availability to parasitoid wasps in cane berry production landscapes. A meta analysis was performed to estimate the effects of different species on longevity of and attraction to various flowers. This information was then used to evaluate the plant species found on Willamette valley cane berry farms and calculate the total floral resource availability of different habitats during different times of the year. Surveys identified particular habitats on the landscape, and different management regimes as having high floral resource availability relative to other habitats or management regimes. The second investigation focuses on the biology of a group of ground beetles that are common on Willamette valley vegetable farms. Pitfall trapping and soil core samples were used to determine the seasonal activity patterns of the carabids, and to identify which habitats they were using most. Sentinel prey cards were used to compare pitfall trap counts with the risk of predation of a potential prey item. Laboratory experiments identified differences in the feeding and activity of different species, and the changes over the season. The third investigation used soil cores to sample the over wintering arthropod predator populations in a variety of habitats on Willamette valley farms, and in plantings of native species on beetle banks in a common garden at the Hyslop research farm in Corvallis, Oregon. Grassy habitats were found to support the highest arthropod populations both on the farms and in the common garden. Some perennial forbs also had high arthropod numbers, while other perennial forbs and annual forbs had low numbers. Differences in the number of over wintering arthropods in different species were related with differences in the structure and composition of the vegetation. The information presented here can be used to assign value to different habitats based on the provision of specific resources required for beneficial predators to complete their life cycles. This will aid in rapid evaluations of farm landscapes based on aerial imagery interpretation or a quick tour. After initial predictions are made it is easier to conduct more in depth sampling to confirm whether the beneficials are in fact present and thriving. If there are resources that are in too short a supply the information provided here will help in designing conservation plantings to provide those resources. Close

• 2. [Article] Investigation of Crangon spawning behavior, assemblage, and trophic relationships in the estuarine and shelf habitats of the central Oregon coast

  This was a final project for BI 450 Marine Biology, which included a paper and a presentation by myself and Larkin Loewenherz. The presentation was given on June 6th, 2014, to a public audience at Hatfield ...

  Citation × Citation Citation Abstract Copy Title: Investigation of Crangon spawning behavior, assemblage, and trophic relationships in the estuarine and shelf habitats of the central Oregon coast Author: Huff, David D., Danilchik, Nikolai M., Loewenherz, Larkin This was a final project for BI 450 Marine Biology, which included a paper and a presentation by myself and Larkin Loewenherz. The presentation was given on June 6th, 2014, to a public audience at Hatfield Marine Science Center. Title: Investigation of Crangon spawning behavior, assemblage, and trophic relationships in the estuarine and shelf habitats of the central Oregon coast Author: Huff, David D., Danilchik, Nikolai M., Loewenherz, Larkin This was a final project for BI 450 Marine Biology, which included a paper and a presentation by myself and Larkin Loewenherz. The presentation was given on June 6th, 2014, to a public audience at Hatfield Marine Science Center. Close

• 3. [Article] Ultraviolet radiation as an environmental stressor of amphibians

  My thesis explored the effects of and potential mediating mechanisms for an important environmental stressor, ultraviolet-B (UVB) radiation. UVB radiation has negative effects on organisms in both terrestrial ...

  Citation × Citation Citation Abstract Copy Title: Ultraviolet radiation as an environmental stressor of amphibians Author: Bancroft, Betsy A. My thesis explored the effects of and potential mediating mechanisms for an important environmental stressor, ultraviolet-B (UVB) radiation. UVB radiation has negative effects on organisms in both terrestrial and aquatic systems. I used meta-analysis to quantify the effects of UVB radiation on a diversity of aquatic organisms (Chapter 2). UVB negatively affects aquatic organisms by reducing both survival and growth. In particular, UVB reduces growth of embryos more than any other life history stage. Some taxonomic groups may be more affected by UVB radiation than others. In our analysis, the growth of members of the kingdom Protozoa was suppressed by UVB radiation to a greater degree than any other kingdom. These analyses suggest that UVB is an important stressor in both freshwater and marine systems. Amphibians are a common component of freshwater systems and are experiencing world-wide population declines. These declines may be due to a number of causes including habitat loss, introduced species, global climate change, disease, toxic chemicals and UVB radiation. I used meta-analytic techniques to quantify the effects of UVB radiation on amphibians. By synthesizing the results of 41 articles on the effects of UVB radiation on amphibians (Chapter 3), I found a nearly 2-fold reduction in survival of amphibians exposed to UVB radiation. Salamanders (caudates) appear to be more susceptible to damage from UVB than frogs or toads (anurans). Moreover, survival of larvae was much lower than survival of embryos or metamorphic individuals under UVB radiation. In addition, I used factorial meta-analytic techniques to explore the interaction between UVB radiation and other stressors in amphibian habitats. UVB radiation acted synergistically with other stressors to reduce survival of amphibians. Behavioral avoidance of UVB radiation may help mediate the negative effects of UVB radiation on amphibians. In aquatic systems, behavioral avoidance usually requires movement out of shallow water, where UVB levels can be high, into deeper waters with lower UVB transmittance. However, these two microhabitats have very different thermal profiles, creating a trade-off between exploiting warm waters with high UVB levels and avoiding UVB by seeking cooler, deeper regions of ponds. I explored the microhabitat use of larvae of four species through a series of laboratory experiments, field experiments, and observational field transects at three different amphibian habitats (Chapter 4). Larvae did not avoid UVB radiation in either the laboratory or field experiments. Larvae in thermal gradients selected relatively high temperatures regardless of the UVB exposure at these temperatures. In field transects, salamander larvae were most common in deeper, cooler waters where UVB levels were lower. In contrast, anuran larvae were frequently observed in the warmer and shallower regions of each habitat. These regions also had the highest UVB levels, suggesting that anuran larvae are exposed to high levels of UVB due to thermoregulatory behavior. Behavioral avoidance of UVB radiation is not the only mechanism amphibians may use to prevent damage from UVB. Pigments such as melanin may allow larvae to exploit warm shallow waters by absorbing harmful UVB radiation before it causes cellular damage. I tested the efficacy of melanin as a photoprotective pigment in the larvae of two species, Rana cascadae and Pseudacris regilla (Chapter 5). I found no evidence of a photoprotective function for melanin in these larvae. In contrast, lighter colored tadpoles grew more under UVB radiation compared to darker colored tadpoles. Overall, exposure to UVB reduced survival of P. regilla larvae and reduced growth of R. cascadae larvae. Larvae of both of these species were frequently observed in very shallow water with intense solar radiation. This thesis emphasizes the importance of UVB radiation as an environmental stressor in aquatic habitats. Many aquatic organisms are negatively affected by UVB exposure. My thesis work quantitatively demonstrated that UVB radiation is one factor that reduces survival of amphibians and suggests that some species are exposed to high levels of UVB radiation in natural habitats. While UVB radiation is not the sole cause of amphibian population declines, my work suggests that UVB radiation is an important stressor for amphibians that should not be overlooked. In addition, UVB radiation is clearly an important stressor for many other aquatic organisms. Future work should consider the effects of UVB in aquatic systems, particularly the effects of UVB radiation on community structure and ecosystem function. Title: Ultraviolet radiation as an environmental stressor of amphibians Author: Bancroft, Betsy A. My thesis explored the effects of and potential mediating mechanisms for an important environmental stressor, ultraviolet-B (UVB) radiation. UVB radiation has negative effects on organisms in both terrestrial and aquatic systems. I used meta-analysis to quantify the effects of UVB radiation on a diversity of aquatic organisms (Chapter 2). UVB negatively affects aquatic organisms by reducing both survival and growth. In particular, UVB reduces growth of embryos more than any other life history stage. Some taxonomic groups may be more affected by UVB radiation than others. In our analysis, the growth of members of the kingdom Protozoa was suppressed by UVB radiation to a greater degree than any other kingdom. These analyses suggest that UVB is an important stressor in both freshwater and marine systems. Amphibians are a common component of freshwater systems and are experiencing world-wide population declines. These declines may be due to a number of causes including habitat loss, introduced species, global climate change, disease, toxic chemicals and UVB radiation. I used meta-analytic techniques to quantify the effects of UVB radiation on amphibians. By synthesizing the results of 41 articles on the effects of UVB radiation on amphibians (Chapter 3), I found a nearly 2-fold reduction in survival of amphibians exposed to UVB radiation. Salamanders (caudates) appear to be more susceptible to damage from UVB than frogs or toads (anurans). Moreover, survival of larvae was much lower than survival of embryos or metamorphic individuals under UVB radiation. In addition, I used factorial meta-analytic techniques to explore the interaction between UVB radiation and other stressors in amphibian habitats. UVB radiation acted synergistically with other stressors to reduce survival of amphibians. Behavioral avoidance of UVB radiation may help mediate the negative effects of UVB radiation on amphibians. In aquatic systems, behavioral avoidance usually requires movement out of shallow water, where UVB levels can be high, into deeper waters with lower UVB transmittance. However, these two microhabitats have very different thermal profiles, creating a trade-off between exploiting warm waters with high UVB levels and avoiding UVB by seeking cooler, deeper regions of ponds. I explored the microhabitat use of larvae of four species through a series of laboratory experiments, field experiments, and observational field transects at three different amphibian habitats (Chapter 4). Larvae did not avoid UVB radiation in either the laboratory or field experiments. Larvae in thermal gradients selected relatively high temperatures regardless of the UVB exposure at these temperatures. In field transects, salamander larvae were most common in deeper, cooler waters where UVB levels were lower. In contrast, anuran larvae were frequently observed in the warmer and shallower regions of each habitat. These regions also had the highest UVB levels, suggesting that anuran larvae are exposed to high levels of UVB due to thermoregulatory behavior. Behavioral avoidance of UVB radiation is not the only mechanism amphibians may use to prevent damage from UVB. Pigments such as melanin may allow larvae to exploit warm shallow waters by absorbing harmful UVB radiation before it causes cellular damage. I tested the efficacy of melanin as a photoprotective pigment in the larvae of two species, Rana cascadae and Pseudacris regilla (Chapter 5). I found no evidence of a photoprotective function for melanin in these larvae. In contrast, lighter colored tadpoles grew more under UVB radiation compared to darker colored tadpoles. Overall, exposure to UVB reduced survival of P. regilla larvae and reduced growth of R. cascadae larvae. Larvae of both of these species were frequently observed in very shallow water with intense solar radiation. This thesis emphasizes the importance of UVB radiation as an environmental stressor in aquatic habitats. Many aquatic organisms are negatively affected by UVB exposure. My thesis work quantitatively demonstrated that UVB radiation is one factor that reduces survival of amphibians and suggests that some species are exposed to high levels of UVB radiation in natural habitats. While UVB radiation is not the sole cause of amphibian population declines, my work suggests that UVB radiation is an important stressor for amphibians that should not be overlooked. In addition, UVB radiation is clearly an important stressor for many other aquatic organisms. Future work should consider the effects of UVB in aquatic systems, particularly the effects of UVB radiation on community structure and ecosystem function. Close

• 4. [Article] Re-examining the relationship between invasive lionfish and native grouper in the Caribbean

  This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by PeerJ. The published article can be found at: https://peerj.com/.

  Citation × Citation Citation Abstract Copy Title: Re-examining the relationship between invasive lionfish and native grouper in the Caribbean Author: Hackerott, Serena, Valdivia, Abel, Bruno, John F., Cox, Courtney E., Green, Stephanie J. This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by PeerJ. The published article can be found at: https://peerj.com/. Title: Re-examining the relationship between invasive lionfish and native grouper in the Caribbean Author: Hackerott, Serena, Valdivia, Abel, Bruno, John F., Cox, Courtney E., Green, Stephanie J. This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by PeerJ. The published article can be found at: https://peerj.com/. Close

• 5. [Article] Aspects of the ecology of the common raven in Harney Basin, Oregon

  Common Ravens (Corvus corax L.) have been implicated as significant predators on the eggs of waterfowl and shorebirds on Malheur National Wildlife Refuge. Malheur Refuge, located in southeastern Oregon ...

  Citation × Citation Citation Abstract Copy Title: Aspects of the ecology of the common raven in Harney Basin, Oregon Author: Stiehl, Richard B. Year: 1978 Common Ravens (Corvus corax L.) have been implicated as significant predators on the eggs of waterfowl and shorebirds on Malheur National Wildlife Refuge. Malheur Refuge, located in southeastern Oregon on the northern edge of the Great Basin, is one of the largest waterfowl refuges in the United States and is an important breeding area for waterfowl. In order to provide fundamental information on which a sound raven management plan could be based, research was conducted from 1975-1977 on aspects of population density, brood phenology, nesting success, seasonal use of the study area, roosting behavior, and food habits of ravens on and near the refuge. Nesting density was determined to be one pair per approximately 25 km2 . Most nests occurred in rimrocks, but trees and abandoned human structures were also used. Investigation of 87 nests revealed that the incubation period was 21 + 1 days. Incubation began with the laying of the first egg; hatching was asynchronous. Nesting period was 41 + 3 days. An original method of age-classing ravens is described. A total of 266 ravens was marked with patagial tags. Observation of marked individuals as far as 480 km from the study area suggests considerable mobility in the population. Population numbers vary seasonally, peaking in the winter. The Harney Basin is the location of an exceptionally large winter roost for ravens. Analysis of food remains, collected from 34 nests, indicates that ravens have varied diets and that there are significant differences in the diets of ravens nesting in different habitats. A correlation exists between the proportion of the diet that is avian material and the proximity of the raven nest to waterfowl production areas. Based on these findings, suggestions are offered for a management plan for Common Ravens on Malheur National Wildlife Refuge. Title: Aspects of the ecology of the common raven in Harney Basin, Oregon Author: Stiehl, Richard B. Year: 1978 Common Ravens (Corvus corax L.) have been implicated as significant predators on the eggs of waterfowl and shorebirds on Malheur National Wildlife Refuge. Malheur Refuge, located in southeastern Oregon on the northern edge of the Great Basin, is one of the largest waterfowl refuges in the United States and is an important breeding area for waterfowl. In order to provide fundamental information on which a sound raven management plan could be based, research was conducted from 1975-1977 on aspects of population density, brood phenology, nesting success, seasonal use of the study area, roosting behavior, and food habits of ravens on and near the refuge. Nesting density was determined to be one pair per approximately 25 km2 . Most nests occurred in rimrocks, but trees and abandoned human structures were also used. Investigation of 87 nests revealed that the incubation period was 21 + 1 days. Incubation began with the laying of the first egg; hatching was asynchronous. Nesting period was 41 + 3 days. An original method of age-classing ravens is described. A total of 266 ravens was marked with patagial tags. Observation of marked individuals as far as 480 km from the study area suggests considerable mobility in the population. Population numbers vary seasonally, peaking in the winter. The Harney Basin is the location of an exceptionally large winter roost for ravens. Analysis of food remains, collected from 34 nests, indicates that ravens have varied diets and that there are significant differences in the diets of ravens nesting in different habitats. A correlation exists between the proportion of the diet that is avian material and the proximity of the raven nest to waterfowl production areas. Based on these findings, suggestions are offered for a management plan for Common Ravens on Malheur National Wildlife Refuge. Close

• 6. [Article] Identifying genomic and metabolic features that can underlie early successional and opportunistic lifestyles of human gut symbionts

  This is the publisher’s final pdf. The published article is copyrighted by Cold Spring Harbor Laboratory Press and can be found at: http://www.cshlpress.com/.

  Citation × Citation Citation Abstract Copy Title: Identifying genomic and metabolic features that can underlie early successional and opportunistic lifestyles of human gut symbionts Author: Gordon, Jeffrey I., Frank, Daniel N., Lozupone, Catherine, Faith, Jeremiah J., Knight, Rob, Faust, Karoline, Raes, Jeroen, Zaneveld, Jesse This is the publisher’s final pdf. The published article is copyrighted by Cold Spring Harbor Laboratory Press and can be found at: http://www.cshlpress.com/. Title: Identifying genomic and metabolic features that can underlie early successional and opportunistic lifestyles of human gut symbionts Author: Gordon, Jeffrey I., Frank, Daniel N., Lozupone, Catherine, Faith, Jeremiah J., Knight, Rob, Faust, Karoline, Raes, Jeroen, Zaneveld, Jesse This is the publisher’s final pdf. The published article is copyrighted by Cold Spring Harbor Laboratory Press and can be found at: http://www.cshlpress.com/. Close

• 7. [Article] Quantification of the Bacteria on Human Skin

  33 pages. A thesis presented to the Department of Biology and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Arts, Fall 2017

  Citation × Citation Citation Abstract Copy Title: Quantification of the Bacteria on Human Skin Author: Sarao, Maria Rose Year: 2017 33 pages. A thesis presented to the Department of Biology and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Arts, Fall 2017 Title: Quantification of the Bacteria on Human Skin Author: Sarao, Maria Rose Year: 2017 33 pages. A thesis presented to the Department of Biology and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Arts, Fall 2017 Close

• 8. [Article] Watershed restoration, jobs-in-the-woods, and community assistance : Redwood National Park and the Northwest Forest Plan

  There are many parallels between the 1978 legislation to expand Redwood National Park and the Northwest Forest Plan, which together with the Northwest Economic Adjustment Initiative formed the 1993 Pacific ...

  Citation × Citation Citation Abstract Copy Title: Watershed restoration, jobs-in-the-woods, and community assistance : Redwood National Park and the Northwest Forest Plan Author: DeForest, Christopher E., Pacific Northwest Research Station (Portland, Or.) There are many parallels between the 1978 legislation to expand Redwood National Park and the Northwest Forest Plan, which together with the Northwest Economic Adjustment Initiative formed the 1993 Pacific Northwest Initiative. In both situations, the Federal Government sought to promote retraining for displaced workers, to undertake watershed assessment and restoration work, and to assist communities with economic planning, grants, and transitions. Both of these efforts point out the inherent conflicts between the economic and ecological objectives of watershed restoration. No one wants to have to choose between reducing sediment an reducing unemployment in coastal forests. Title: Watershed restoration, jobs-in-the-woods, and community assistance : Redwood National Park and the Northwest Forest Plan Author: DeForest, Christopher E., Pacific Northwest Research Station (Portland, Or.) There are many parallels between the 1978 legislation to expand Redwood National Park and the Northwest Forest Plan, which together with the Northwest Economic Adjustment Initiative formed the 1993 Pacific Northwest Initiative. In both situations, the Federal Government sought to promote retraining for displaced workers, to undertake watershed assessment and restoration work, and to assist communities with economic planning, grants, and transitions. Both of these efforts point out the inherent conflicts between the economic and ecological objectives of watershed restoration. No one wants to have to choose between reducing sediment an reducing unemployment in coastal forests. Close

• 9. [Article] Cryptogam communities in forest and steppe ecosystems of Oregon, USA

  I focus on addressing knowledge gaps relating to management of cryptogams in Oregon's public lands in Pseudotsuga menziesii-Tsuga heterophylla forests on the west side of the Cascade Range and dryland ...

  Citation × Citation Citation Abstract Copy Title: Cryptogam communities in forest and steppe ecosystems of Oregon, USA Author: Root, Heather T. I focus on addressing knowledge gaps relating to management of cryptogams in Oregon's public lands in Pseudotsuga menziesii-Tsuga heterophylla forests on the west side of the Cascade Range and dryland steppe in the Cascade Range's rainshadow. While a great deal of research has illustrated the importance of late-successional forests for maintaining biodiversity in the Pacific Northwest of North America, over 76% of the forests in the region are less than 100 years old. To preserve landscape-level biodiversity, forest managers are increasingly interested in how young stands can be manipulated to favor late-successional species. At two sites in moist conifer forests of western Oregon, lichen community monitoring plots were established prior to treatment and resampled approximately 10 years after alternative thinning treatments aimed at promoting late-successional strucural characteristics. At both sites, hardwood gaps and open-grown trees were positively associated with cyanolichen species richness. At one site, thinned plots hosted more Bryoria, Candelaria concolor, Leptogium polycarpum, Peltigera collina, Nephroma laevigatum and Physcia tenella than had been observed prior to thinning. I concluded that thinning treatments retaining remnants, open-grown trees and hardwood gaps have potential to favor lichen communities rich in cyanolichen and alectorioid species. In the same sites, I sought to understand how stand-level gradients in canopy structure relate to dominant forest floor bryophyte and lichen species composition and abundance. At the one site, I found no strong associations between forest floor communities and stand structural characteristics. At the the other, lichens, particularly Cladonia, were negatively associated with canopy cover whereas bryophyte abundance was positively associated with Tsuga basal area. This relationship was stronger in the thinned stands, which had a different community composition than those left unthinned. Overall, the forest floor communities were fairly homogeneous at both sites and relationships with stand structural variables were subtle, indicating that thinning did not have a strong impact. Biological soil crusts are ecosystem engineers in arid and semi-arid habitats; they affect soil chemistry, stability, and vegetation. Little is known about regional variation in biotic crust communities of North America. I explored how biotic crust lichen community composition and richness related to vascular plant, soil and climate characteristics in Oregon. In 59 0.4-ha plots, I found 99 biotic crust lichen taxa, one-third of which were observed only once, 33 of which occurred in only one plot and seven of which were new to Oregon. I compiled records from herbaria and other studies to evaluate the rarity of 124 biotic crust lichen species and conclude that 37 are rare or uncommon. Many of these appear to be associated with calcareous substrates. I modeled occurrences in relation to climate and soil variables for four uncommon biotic crust lichens: Acarospora schleicheri, Fuscopannaria cyanolepra, Rhizocarpon diploschistidina, and Texosporium sancti-jacobi. Based on climate and soils, I mapped regions of Oregon that may support new populations of these species and overlay habitats unsuitable for biotic crusts due to development and agriculture. These species, except Fuscopannaria cyanolepra, are strongly associated with the fine soils along the Columbia and Treasure Valleys that are most intensively used for agriculture. Biotic crust lichen communities rich in cyanolichens characterized Juniperus stands whereas warm grasslands were home to regionally uncommon species including Texosporium sancti-jacobi and Rhizocarpon diploschistidina. I discerned biotic crust communities in sandy Artemisia tridentata ssp. wyomingensis sites from those loamy A. arbuscula sites. Hotspots of biotic crust diversity were geographically scattered, weakly negatively associated with abundance of shrubs of disturbed sites, Gutierrezia and Chrysothamnus. The poorest sites for biotic crust lichen richness were heavily grazed, burned plots with Gutierrezia in the grassy north, unstable steep talus slopes at the center, and sandy, grazed sites with Chrysothamnus in the southern portion of our region. Overall, regional patterns in biotic crust lichen communities were strongly associated with vegetation, soils, and climate. I hope that my findings will promote intentional management of epiphytic and forest floor cryptogams of western Oregon forests and monitoring of biotic lichen communities in eastern Oregon. Title: Cryptogam communities in forest and steppe ecosystems of Oregon, USA Author: Root, Heather T. I focus on addressing knowledge gaps relating to management of cryptogams in Oregon's public lands in Pseudotsuga menziesii-Tsuga heterophylla forests on the west side of the Cascade Range and dryland steppe in the Cascade Range's rainshadow. While a great deal of research has illustrated the importance of late-successional forests for maintaining biodiversity in the Pacific Northwest of North America, over 76% of the forests in the region are less than 100 years old. To preserve landscape-level biodiversity, forest managers are increasingly interested in how young stands can be manipulated to favor late-successional species. At two sites in moist conifer forests of western Oregon, lichen community monitoring plots were established prior to treatment and resampled approximately 10 years after alternative thinning treatments aimed at promoting late-successional strucural characteristics. At both sites, hardwood gaps and open-grown trees were positively associated with cyanolichen species richness. At one site, thinned plots hosted more Bryoria, Candelaria concolor, Leptogium polycarpum, Peltigera collina, Nephroma laevigatum and Physcia tenella than had been observed prior to thinning. I concluded that thinning treatments retaining remnants, open-grown trees and hardwood gaps have potential to favor lichen communities rich in cyanolichen and alectorioid species. In the same sites, I sought to understand how stand-level gradients in canopy structure relate to dominant forest floor bryophyte and lichen species composition and abundance. At the one site, I found no strong associations between forest floor communities and stand structural characteristics. At the the other, lichens, particularly Cladonia, were negatively associated with canopy cover whereas bryophyte abundance was positively associated with Tsuga basal area. This relationship was stronger in the thinned stands, which had a different community composition than those left unthinned. Overall, the forest floor communities were fairly homogeneous at both sites and relationships with stand structural variables were subtle, indicating that thinning did not have a strong impact. Biological soil crusts are ecosystem engineers in arid and semi-arid habitats; they affect soil chemistry, stability, and vegetation. Little is known about regional variation in biotic crust communities of North America. I explored how biotic crust lichen community composition and richness related to vascular plant, soil and climate characteristics in Oregon. In 59 0.4-ha plots, I found 99 biotic crust lichen taxa, one-third of which were observed only once, 33 of which occurred in only one plot and seven of which were new to Oregon. I compiled records from herbaria and other studies to evaluate the rarity of 124 biotic crust lichen species and conclude that 37 are rare or uncommon. Many of these appear to be associated with calcareous substrates. I modeled occurrences in relation to climate and soil variables for four uncommon biotic crust lichens: Acarospora schleicheri, Fuscopannaria cyanolepra, Rhizocarpon diploschistidina, and Texosporium sancti-jacobi. Based on climate and soils, I mapped regions of Oregon that may support new populations of these species and overlay habitats unsuitable for biotic crusts due to development and agriculture. These species, except Fuscopannaria cyanolepra, are strongly associated with the fine soils along the Columbia and Treasure Valleys that are most intensively used for agriculture. Biotic crust lichen communities rich in cyanolichens characterized Juniperus stands whereas warm grasslands were home to regionally uncommon species including Texosporium sancti-jacobi and Rhizocarpon diploschistidina. I discerned biotic crust communities in sandy Artemisia tridentata ssp. wyomingensis sites from those loamy A. arbuscula sites. Hotspots of biotic crust diversity were geographically scattered, weakly negatively associated with abundance of shrubs of disturbed sites, Gutierrezia and Chrysothamnus. The poorest sites for biotic crust lichen richness were heavily grazed, burned plots with Gutierrezia in the grassy north, unstable steep talus slopes at the center, and sandy, grazed sites with Chrysothamnus in the southern portion of our region. Overall, regional patterns in biotic crust lichen communities were strongly associated with vegetation, soils, and climate. I hope that my findings will promote intentional management of epiphytic and forest floor cryptogams of western Oregon forests and monitoring of biotic lichen communities in eastern Oregon. Close

• 10. [Article] Averting biodiversity collapse in tropical forest protected areas

  This is the publisher’s final pdf. The published article is copyrighted by Macmillan Publishers Limited and the Nature Publishing Group and can be found at: http://www.nature.com/nature/index.html. To ...

  Citation × Citation Citation Abstract Copy Title: Averting biodiversity collapse in tropical forest protected areas Author: Lovett, Jon, Arroyo-Rodriguez, Victor, Ewango, Corneille, Rendeiro, Julio, Dirzo, Rodolfo, Poulsen, John, Corlett, Richard, Waltert, Matthias, Cords, Marina, Goodale, Uromi, Struhsaker, Thomas, Terborgh, John, Magnusson, William, Schaab, Gertrud, Banki, Olaf, Babweteera, Fred, Foster, Mercedes, Rainey, Hugo, De Dijn, Bart, Herbinger, Ilka, Janovec, John, Montag, Luciano, Stanford, Craig, Lugo, Ariel, Guix, Juan C., Sun, I. Fang, Cannon, Charles H., Silman, Miles R., Kasangaki, Aventino, Wang, Benjamin, Surbeck, Martin, Bunyavejchewin, Sarayudh, Maisels, Fiona, Lindsell, Jeremy, Nielsen, Martin R., Krishnaswamy, Jagdish, Savini, Tommaso, Parthasarathy, N., Auzel, Philippe, Killeen, Timothy, de Almeida, Samuel Soares, Abernethy, Kate, Benitez-Malvido, Julieta, de Castilho, Carolina Volkmer, Venn, Linda, Umapathy, Govindaswamy, Carroll, Richard, Pisciotta, Katia, Arias-G, Juan Carlos, Wright, Patricia, Baker, Patrick, Jin, Chen, Round, Philip, Bruehl, Carsten A., Linsenmair, K. Eduard, McNab, Roan, Huang, Zhongliang, Itoh, Akira, Scatena, Frederick, Sloan, Sean P., Schulze, Christian, Klop, Erik, McGraw, W. Scott, Pearson, Richard, Laval, Richard, Karpanty, Sarah, Sanaiotti, Tania, Roedel, Mark-Oliver, Ickes, Kalan, Ashton, Peter, Diesmos, Arvin, Guthiga, Paul, Coates, Rosamond, Nepal, Sanjay, Kone, Inza, Plumptre, Andrew, Williams, Stephen, Goodman, Steven, van der Ploeg, Jan, Pitman, Nigel, Lattke, John, Mack, Andrew L., Brockelman, Warren, Haber, William, Wright, Debra D., Clark, Connie J., Chellam, Ravi, Smith, Thomas B., Zamzani, Franky, Reynolds, Glen, Edwards, David, Chapman, Colin, Quesada, Mauricio, Knott, Cheryl, Rajathurai, Subaraj, Renton, Katherine, Danielsen, Finn, Jiangming, Mo, Whitney, Ken, Vasudevan, Karthikeyan, Bila-Isia, Inogwabini, Estrada, Alejandro, Ivanauskas, Natalia, Whitacre, David, Timm, Robert, Congdon, Robert, Kalko, Elisabeth, Harris, David, Stewart, Kristine, Xiankai, Lu, Jackes, Betsy, da Silva, Rosa de Nazarepaes, Martins, Marlucia, Kalka, Margareta, Rivera, Jorge Vega, King, Hen-biau, Turkalo, Andrea, Clavijo, Jose, Wilkie, David, Wright, S. Joseph, Cao, Min, Sodhi, Navjot, Janzen, Daniel, Mudappa, Divya, Laurance, Susan G., Stoner, Kathryn E., Rovero, Francesco, McClearn, Deedra, Eaton, Mitchell, Hamer, Keith, Parker, Kenneth, Leal, Miguel, Norconk, Marilyn, Gale, George, Stokes, Emma, Hill, Jane, van Weerd, Merlijn, Logsdon, Willis, Fedigan, Linda, Alvarez, Patricia, Brokaw, Nicholas, Marshall, Andrew R., Dave, Chittaranjan, Seidensticker, John, Edwards, Felicity, Campbell, Mason, Useche, D. Carolina, Feer, Francois, Nabe-Nielsen, Jacob, Di Fiore, Anthony, Ouboter, Paul, Yonzon, Pralad, Watts, David, Laurance, William F., Davies, Glyn, Arroyo, Luzmila, Kudavidanage, Enoka, Blake, Stephen, Hart, John, Verea, Carlos, Tobler, Mathias, Willis, Jacalyn Giacalone, Forget, Pierre-Michel, Lentino, Miguel, Lawton, Robert, Roetgers, Christiane, Blom, Allard, Robinson, Douglas, Opiang, Muse, Tscharntke, Teja, Ribeiro, Jose Lahoz da Silva, Thompson, Jo Myers, Losos, Elizabeth, Babaasa, Dennis, Rothman, Jessica, Chao, Jung-Tai, Doran-Sheehy, Diane, Dinerstein, Eric, Harrison, Rhett, Ling-Ling, Lee, O'Donnell, Sean, Donnelly, Maureen A., Reichard, Ulrich, Leonel, Cristiane, Leighton, Mark, Bobo, Kadiri S., Kress, W. John, Fruth, Barbara, Pringle, Catherine, Thomas, Duncan, Justiniano, Hermes, Farwig, Nina, Bradshaw, Corey J. A., Sukumar, Raman, Venkataraman, Meena, Lwanga, Jeremiah, Ashton, Mark, Reynolds, Vernon, Sheil, Douglas, Riley, Erin, Siaka, Alhaji, Nakagawa, Michiko, Fashing, Peter, Urbina-Cardona, J. Nicolas, Beisiegel, Beatriz de Mello, Emmons, Louise, Weber, William, West, Paige, Reinartz, Gay, Dattaraja, H. S., Chave, Jerome, Prawiradilaga, Dewi, Jones, Trevor, Sakai, Shoko, Bass, Margot, Novotny, Vojtech This is the publisher’s final pdf. The published article is copyrighted by Macmillan Publishers Limited and the Nature Publishing Group and can be found at: http://www.nature.com/nature/index.html. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. Title: Averting biodiversity collapse in tropical forest protected areas Author: Lovett, Jon, Arroyo-Rodriguez, Victor, Ewango, Corneille, Rendeiro, Julio, Dirzo, Rodolfo, Poulsen, John, Corlett, Richard, Waltert, Matthias, Cords, Marina, Goodale, Uromi, Struhsaker, Thomas, Terborgh, John, Magnusson, William, Schaab, Gertrud, Banki, Olaf, Babweteera, Fred, Foster, Mercedes, Rainey, Hugo, De Dijn, Bart, Herbinger, Ilka, Janovec, John, Montag, Luciano, Stanford, Craig, Lugo, Ariel, Guix, Juan C., Sun, I. Fang, Cannon, Charles H., Silman, Miles R., Kasangaki, Aventino, Wang, Benjamin, Surbeck, Martin, Bunyavejchewin, Sarayudh, Maisels, Fiona, Lindsell, Jeremy, Nielsen, Martin R., Krishnaswamy, Jagdish, Savini, Tommaso, Parthasarathy, N., Auzel, Philippe, Killeen, Timothy, de Almeida, Samuel Soares, Abernethy, Kate, Benitez-Malvido, Julieta, de Castilho, Carolina Volkmer, Venn, Linda, Umapathy, Govindaswamy, Carroll, Richard, Pisciotta, Katia, Arias-G, Juan Carlos, Wright, Patricia, Baker, Patrick, Jin, Chen, Round, Philip, Bruehl, Carsten A., Linsenmair, K. Eduard, McNab, Roan, Huang, Zhongliang, Itoh, Akira, Scatena, Frederick, Sloan, Sean P., Schulze, Christian, Klop, Erik, McGraw, W. Scott, Pearson, Richard, Laval, Richard, Karpanty, Sarah, Sanaiotti, Tania, Roedel, Mark-Oliver, Ickes, Kalan, Ashton, Peter, Diesmos, Arvin, Guthiga, Paul, Coates, Rosamond, Nepal, Sanjay, Kone, Inza, Plumptre, Andrew, Williams, Stephen, Goodman, Steven, van der Ploeg, Jan, Pitman, Nigel, Lattke, John, Mack, Andrew L., Brockelman, Warren, Haber, William, Wright, Debra D., Clark, Connie J., Chellam, Ravi, Smith, Thomas B., Zamzani, Franky, Reynolds, Glen, Edwards, David, Chapman, Colin, Quesada, Mauricio, Knott, Cheryl, Rajathurai, Subaraj, Renton, Katherine, Danielsen, Finn, Jiangming, Mo, Whitney, Ken, Vasudevan, Karthikeyan, Bila-Isia, Inogwabini, Estrada, Alejandro, Ivanauskas, Natalia, Whitacre, David, Timm, Robert, Congdon, Robert, Kalko, Elisabeth, Harris, David, Stewart, Kristine, Xiankai, Lu, Jackes, Betsy, da Silva, Rosa de Nazarepaes, Martins, Marlucia, Kalka, Margareta, Rivera, Jorge Vega, King, Hen-biau, Turkalo, Andrea, Clavijo, Jose, Wilkie, David, Wright, S. Joseph, Cao, Min, Sodhi, Navjot, Janzen, Daniel, Mudappa, Divya, Laurance, Susan G., Stoner, Kathryn E., Rovero, Francesco, McClearn, Deedra, Eaton, Mitchell, Hamer, Keith, Parker, Kenneth, Leal, Miguel, Norconk, Marilyn, Gale, George, Stokes, Emma, Hill, Jane, van Weerd, Merlijn, Logsdon, Willis, Fedigan, Linda, Alvarez, Patricia, Brokaw, Nicholas, Marshall, Andrew R., Dave, Chittaranjan, Seidensticker, John, Edwards, Felicity, Campbell, Mason, Useche, D. Carolina, Feer, Francois, Nabe-Nielsen, Jacob, Di Fiore, Anthony, Ouboter, Paul, Yonzon, Pralad, Watts, David, Laurance, William F., Davies, Glyn, Arroyo, Luzmila, Kudavidanage, Enoka, Blake, Stephen, Hart, John, Verea, Carlos, Tobler, Mathias, Willis, Jacalyn Giacalone, Forget, Pierre-Michel, Lentino, Miguel, Lawton, Robert, Roetgers, Christiane, Blom, Allard, Robinson, Douglas, Opiang, Muse, Tscharntke, Teja, Ribeiro, Jose Lahoz da Silva, Thompson, Jo Myers, Losos, Elizabeth, Babaasa, Dennis, Rothman, Jessica, Chao, Jung-Tai, Doran-Sheehy, Diane, Dinerstein, Eric, Harrison, Rhett, Ling-Ling, Lee, O'Donnell, Sean, Donnelly, Maureen A., Reichard, Ulrich, Leonel, Cristiane, Leighton, Mark, Bobo, Kadiri S., Kress, W. John, Fruth, Barbara, Pringle, Catherine, Thomas, Duncan, Justiniano, Hermes, Farwig, Nina, Bradshaw, Corey J. A., Sukumar, Raman, Venkataraman, Meena, Lwanga, Jeremiah, Ashton, Mark, Reynolds, Vernon, Sheil, Douglas, Riley, Erin, Siaka, Alhaji, Nakagawa, Michiko, Fashing, Peter, Urbina-Cardona, J. Nicolas, Beisiegel, Beatriz de Mello, Emmons, Louise, Weber, William, West, Paige, Reinartz, Gay, Dattaraja, H. S., Chave, Jerome, Prawiradilaga, Dewi, Jones, Trevor, Sakai, Shoko, Bass, Margot, Novotny, Vojtech This is the publisher’s final pdf. The published article is copyrighted by Macmillan Publishers Limited and the Nature Publishing Group and can be found at: http://www.nature.com/nature/index.html. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. Close