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• 1. [Article] Individual Habitat Quotas for Fisheries

  Research Paper

  Citation × Citation Citation Abstract Copy Title: Individual Habitat Quotas for Fisheries Author: Holland, Daniel S., Schnier, Kurt E. Research Paper Title: Individual Habitat Quotas for Fisheries Author: Holland, Daniel S., Schnier, Kurt E. Research Paper Close

• 2. [Article] A Bioeconomic Model of Partial Closures and Habitat Effects - The Case of a Migratory Fish Species

  Research Paper

  Citation × Citation Citation Abstract Copy Title: A Bioeconomic Model of Partial Closures and Habitat Effects - The Case of a Migratory Fish Species Author: Armstrong, Claire W., Reithe, Siv, Armstrong, Richard J. Research Paper Title: A Bioeconomic Model of Partial Closures and Habitat Effects - The Case of a Migratory Fish Species Author: Armstrong, Claire W., Reithe, Siv, Armstrong, Richard J. Research Paper Close

• 3. [Article] A Prototype Study for Evaluation of Algal Beds

  Research Paper

  Citation × Citation Citation Abstract Copy Title: A Prototype Study for Evaluation of Algal Beds Author: Takashima, Yoshikazu, Kaneko, Tomomi Research Paper Title: A Prototype Study for Evaluation of Algal Beds Author: Takashima, Yoshikazu, Kaneko, Tomomi Research Paper Close

• 4. [Article] The Effects of Derelict Gear on Blue Crab Production in the Chesapeake Bay

  Several factors currently threaten blue crab (Callinectes sapidus) in the Chesapeake Bay. In addition to poor water quality, degraded habitat, and shifting environmental conditions, derelict gear has recently ...

  Citation × Citation Citation Abstract Copy Title: The Effects of Derelict Gear on Blue Crab Production in the Chesapeake Bay Author: Bilkovic, Donna M., Scheld, Andrew M., Havens, Kirk J. Several factors currently threaten blue crab (Callinectes sapidus) in the Chesapeake Bay. In addition to poor water quality, degraded habitat, and shifting environmental conditions, derelict gear has recently been recognized as a significant source of mortality for this economically and culturally significant species. From 2008 through 2014, commercial watermen in Virginia were hired during their winter off season to locate, document, and remove derelict gear as part of a larger research effort to determine the biological impacts of marine debris in the Chesapeake Bay. Data on derelict gear removal generated by this research was subsequently paired with spatially resolved catch and effort data and entered into a translog production model used to estimate the economic effects of derelict gear on commercial blue crab production. Model results indicate removal significantly improved pot production and economic profits, a finding which had been previously confounded by concurrent blue crab management action. Our research builds on previous work through explicit acknowledgment of important spatial production differences and incorporation of derelict gear removal. Title: The Effects of Derelict Gear on Blue Crab Production in the Chesapeake Bay Author: Bilkovic, Donna M., Scheld, Andrew M., Havens, Kirk J. Several factors currently threaten blue crab (Callinectes sapidus) in the Chesapeake Bay. In addition to poor water quality, degraded habitat, and shifting environmental conditions, derelict gear has recently been recognized as a significant source of mortality for this economically and culturally significant species. From 2008 through 2014, commercial watermen in Virginia were hired during their winter off season to locate, document, and remove derelict gear as part of a larger research effort to determine the biological impacts of marine debris in the Chesapeake Bay. Data on derelict gear removal generated by this research was subsequently paired with spatially resolved catch and effort data and entered into a translog production model used to estimate the economic effects of derelict gear on commercial blue crab production. Model results indicate removal significantly improved pot production and economic profits, a finding which had been previously confounded by concurrent blue crab management action. Our research builds on previous work through explicit acknowledgment of important spatial production differences and incorporation of derelict gear removal. Close

• 5. [Article] Applying Benefit Transfer to Improve the Transfer of Ecological Estimates in Ecosystem Services Research and Policy

  Ecosystem services (ES) represent a way to represent and quantify multiple uses, values as well as connectivity between ecosystem processes and human well-being. Ecosystem-based fisheries management approaches ...

  Citation × Citation Citation Abstract Copy Title: Applying Benefit Transfer to Improve the Transfer of Ecological Estimates in Ecosystem Services Research and Policy Author: Errend, Melissa, Moon, JB, DeWitt, Ted Ecosystem services (ES) represent a way to represent and quantify multiple uses, values as well as connectivity between ecosystem processes and human well-being. Ecosystem-based fisheries management approaches may seek to quantify expected trade-offs in ecosystem services due to actions such as restoration and gear restrictions, or due to changes such as climate change and ocean acidification. However, lack of adequate data, time or budget constraints needed to model these scenarios in part creates a demand to directly apply (i.e., transfer) existing models and estimates of ecological production across different geographic, temporal, or spatial scales. Inconsistency and a lack of transparency in how knowledge gaps are filled by transfers can create sources of uncertainty and error that can propagate through and between ecosystem service values and assessments. While production estimate transfer represents a useful tool for research, policy and management to gain ES information when primary research is not available, transparency concerning these values is needed for assessing assumptions, trade-offs, and the need for primary research. While methodologies exist to facilitate and analyze the transfer of economic ES values (e.g., benefit transfer), there is no analogous formalized process to transfer ecological data underlying ES production. Drawing from the benefit transfer literature, we present a framework to similarly improve the transparency and accuracy of transferred ecological and biophysical ES production estimates in coastal ecosystem services assessments, specifically for habitat-fishery linkages. Title: Applying Benefit Transfer to Improve the Transfer of Ecological Estimates in Ecosystem Services Research and Policy Author: Errend, Melissa, Moon, JB, DeWitt, Ted Ecosystem services (ES) represent a way to represent and quantify multiple uses, values as well as connectivity between ecosystem processes and human well-being. Ecosystem-based fisheries management approaches may seek to quantify expected trade-offs in ecosystem services due to actions such as restoration and gear restrictions, or due to changes such as climate change and ocean acidification. However, lack of adequate data, time or budget constraints needed to model these scenarios in part creates a demand to directly apply (i.e., transfer) existing models and estimates of ecological production across different geographic, temporal, or spatial scales. Inconsistency and a lack of transparency in how knowledge gaps are filled by transfers can create sources of uncertainty and error that can propagate through and between ecosystem service values and assessments. While production estimate transfer represents a useful tool for research, policy and management to gain ES information when primary research is not available, transparency concerning these values is needed for assessing assumptions, trade-offs, and the need for primary research. While methodologies exist to facilitate and analyze the transfer of economic ES values (e.g., benefit transfer), there is no analogous formalized process to transfer ecological data underlying ES production. Drawing from the benefit transfer literature, we present a framework to similarly improve the transparency and accuracy of transferred ecological and biophysical ES production estimates in coastal ecosystem services assessments, specifically for habitat-fishery linkages. Close

• 6. [Article] Non-use Values in Natural Resource Management – A Bioeconomic Model of Fisheries and Habitat

  As fisheries management becomes more collaborative by seeking input and involvement from stakeholders, it is important to understand and address the diversity of those stakeholders. Gulf Coast fisheries ...

  Citation × Citation Citation Abstract Copy Title: Non-use Values in Natural Resource Management – A Bioeconomic Model of Fisheries and Habitat Author: Kahui, Viktoria, Armstrong, Claire W., Aanesen, Margrethe, Czajkowski, Mikolaj, Vondolia, Godwin Kofi As fisheries management becomes more collaborative by seeking input and involvement from stakeholders, it is important to understand and address the diversity of those stakeholders. Gulf Coast fisheries communities include diverse racial and ethnic groups, particularly a large number of Vietnamese Americans involved in all aspects of the seafood industry. Recent disasters, including hurricanes and the BP Macondo oil spill, have exposed a number of communication barriers between state and federal agencies and the Vietnamese American fishing community on the Gulf Coast as well as a lack of reliable socioeconomic data on Vietnamese American fishers and their management and governance priorities. This research focuses on a mixed methods approach to create a database of key baseline socioeconomic data on the Vietnamese American communities affected by fishery management in Mississippi and Alabama and as well as to identify avenues and barriers for communication between Vietnamese American fishers and state and federal fisheries-related agencies in the region. In doing so, we discuss using a combination of 1) face-to-face surveys with Vietnamese Americans in the fishing industry, 2) interviews with representatives of relevant state and federal agencies, 3) interviews with community organizations and key informants, and 4) focus groups with Vietnamese Americans in different aspects of the fishing industry. Collection of this type of data will be used in identifying potential strategies to improve engagement of Vietnamese American stakeholders in the region and be crucial to understand the current and future consequences of management choices for diverse stakeholders. Title: Non-use Values in Natural Resource Management – A Bioeconomic Model of Fisheries and Habitat Author: Kahui, Viktoria, Armstrong, Claire W., Aanesen, Margrethe, Czajkowski, Mikolaj, Vondolia, Godwin Kofi As fisheries management becomes more collaborative by seeking input and involvement from stakeholders, it is important to understand and address the diversity of those stakeholders. Gulf Coast fisheries communities include diverse racial and ethnic groups, particularly a large number of Vietnamese Americans involved in all aspects of the seafood industry. Recent disasters, including hurricanes and the BP Macondo oil spill, have exposed a number of communication barriers between state and federal agencies and the Vietnamese American fishing community on the Gulf Coast as well as a lack of reliable socioeconomic data on Vietnamese American fishers and their management and governance priorities. This research focuses on a mixed methods approach to create a database of key baseline socioeconomic data on the Vietnamese American communities affected by fishery management in Mississippi and Alabama and as well as to identify avenues and barriers for communication between Vietnamese American fishers and state and federal fisheries-related agencies in the region. In doing so, we discuss using a combination of 1) face-to-face surveys with Vietnamese Americans in the fishing industry, 2) interviews with representatives of relevant state and federal agencies, 3) interviews with community organizations and key informants, and 4) focus groups with Vietnamese Americans in different aspects of the fishing industry. Collection of this type of data will be used in identifying potential strategies to improve engagement of Vietnamese American stakeholders in the region and be crucial to understand the current and future consequences of management choices for diverse stakeholders. Close

• 7. [Article] Baseline investigation and promotion of self-organizing networks in two Southern areas of Thailand

  Research Paper

  Citation × Citation Citation Abstract Copy Title: Baseline investigation and promotion of self-organizing networks in two Southern areas of Thailand Author: Tandavanitj, Sanchai, Henoque, Yves Research Paper Title: Baseline investigation and promotion of self-organizing networks in two Southern areas of Thailand Author: Tandavanitj, Sanchai, Henoque, Yves Research Paper Close

• 8. [Article] Valuing Ecosystem Services: Oysters, Denitrification, and Nutrient Trading Programs

  Maryland, Pennsylvania, Virginia, and West Virginia have all developed nutrient trading programs to defray the cost of achieving mandated nitrogen load reductions in Chesapeake Bay, and there is increasing ...

  Citation × Citation Citation Abstract Copy Title: Valuing Ecosystem Services: Oysters, Denitrification, and Nutrient Trading Programs Author: DePiper, Geret S., Lipcius, Romuald N., Lipton, Douglas W. Maryland, Pennsylvania, Virginia, and West Virginia have all developed nutrient trading programs to defray the cost of achieving mandated nitrogen load reductions in Chesapeake Bay, and there is increasing interest in the role oysters can play in generating credits. A number of bioeconomic models highlight the impact these credits have in optimizing oyster harvest rates, but all overlook a major limiting factor in oyster population dynamics: oyster shell is an oyster’s preferred settling medium. Harvest thus impacts oyster productivity through the removal of both extant oysters and the future shell habitat. This is extremely important given that the removal of shell and oyster meat is a major channel by which nutrient credits could be generated. Further, recent research suggests that multiple oyster reef equilibria exist, and reef height determines the trajectory of oyster population change. In this research we couple a biological model of an oyster population, including shell dynamics, to a value function and analyze optimal oyster harvest regimes. The value function incorporates both the oyster harvesting profits and the value of an oyster reefs’ nutrient sequestration and denitrification. We then maximize the net present value of the oyster reef, using numerical dynamic programming and simulation techniques for a reasonable range of biological and economic parameters, to provide policy guidance on the trade-off between harvest, sequestration and denitrification services. Results indicate that optimal harvest rates are more sensitive to variability in the biological rather than economic parameters, although some level of harvest is almost always optimal. Title: Valuing Ecosystem Services: Oysters, Denitrification, and Nutrient Trading Programs Author: DePiper, Geret S., Lipcius, Romuald N., Lipton, Douglas W. Maryland, Pennsylvania, Virginia, and West Virginia have all developed nutrient trading programs to defray the cost of achieving mandated nitrogen load reductions in Chesapeake Bay, and there is increasing interest in the role oysters can play in generating credits. A number of bioeconomic models highlight the impact these credits have in optimizing oyster harvest rates, but all overlook a major limiting factor in oyster population dynamics: oyster shell is an oyster’s preferred settling medium. Harvest thus impacts oyster productivity through the removal of both extant oysters and the future shell habitat. This is extremely important given that the removal of shell and oyster meat is a major channel by which nutrient credits could be generated. Further, recent research suggests that multiple oyster reef equilibria exist, and reef height determines the trajectory of oyster population change. In this research we couple a biological model of an oyster population, including shell dynamics, to a value function and analyze optimal oyster harvest regimes. The value function incorporates both the oyster harvesting profits and the value of an oyster reefs’ nutrient sequestration and denitrification. We then maximize the net present value of the oyster reef, using numerical dynamic programming and simulation techniques for a reasonable range of biological and economic parameters, to provide policy guidance on the trade-off between harvest, sequestration and denitrification services. Results indicate that optimal harvest rates are more sensitive to variability in the biological rather than economic parameters, although some level of harvest is almost always optimal. Close