Search

Search Results

• 1. [Article] The Limitation of Spread of Non-native Marine Invertebrates from Artificial Structures to Natural Habitats

  Artificial structures created for aquatic anthropogenic activities are often colonized and fouled by many non-native species, few of which have invaded natural areas. Some research has indicated predation ...

  Citation × Citation Citation Abstract Copy Title: The Limitation of Spread of Non-native Marine Invertebrates from Artificial Structures to Natural Habitats Author: McClees, Whitney, de Rivera, Catherine E. Year: 2017 Artificial structures created for aquatic anthropogenic activities are often colonized and fouled by many non-native species, few of which have invaded natural areas. Some research has indicated predation is limiting the spread of non-native species, while other research has indicated that it is dispersal-driven. To determine the effects of dispersal limitation and predation on the risk to surrounding habitats of being invaded by non-native species established on marina docks, we used a three-factor design, deploying seven unglazed ceramic panels per each treatment combination of 1) inside versus outside a marina in Yaquina Bay, Oregon; 2) cage keeping out predators >mesh size, no cage, or partial cage; 3) fixed near the substrata (benthic) versus floating 1m below the surface. We also moved panels of either adults or recruits from floating in the marina to any of the treatment combinations to test if they would have lower survival outside by the substrate. The community on panels suspended in the marina only minimally overlapped with panels outside of the marina near the bottom. However, there was no difference between the cage treatments, which suggests that predators excluded by the cages are not responsible for the observed differences in species richness or composition. Title: The Limitation of Spread of Non-native Marine Invertebrates from Artificial Structures to Natural Habitats Author: McClees, Whitney, de Rivera, Catherine E. Year: 2017 Artificial structures created for aquatic anthropogenic activities are often colonized and fouled by many non-native species, few of which have invaded natural areas. Some research has indicated predation is limiting the spread of non-native species, while other research has indicated that it is dispersal-driven. To determine the effects of dispersal limitation and predation on the risk to surrounding habitats of being invaded by non-native species established on marina docks, we used a three-factor design, deploying seven unglazed ceramic panels per each treatment combination of 1) inside versus outside a marina in Yaquina Bay, Oregon; 2) cage keeping out predators >mesh size, no cage, or partial cage; 3) fixed near the substrata (benthic) versus floating 1m below the surface. We also moved panels of either adults or recruits from floating in the marina to any of the treatment combinations to test if they would have lower survival outside by the substrate. The community on panels suspended in the marina only minimally overlapped with panels outside of the marina near the bottom. However, there was no difference between the cage treatments, which suggests that predators excluded by the cages are not responsible for the observed differences in species richness or composition. Close

• 2. [Article] Integrating Ecosystem Services, River Restoration and Community: A Case Study at Fisher's Bend

  Natural areas and ecosystem services at the edge of urban areas are threatened by increasing development. This paper examines how community based restoration partnerships can work to identify, protect ...

  Citation × Citation Citation Abstract Copy Title: Integrating Ecosystem Services, River Restoration and Community: A Case Study at Fisher's Bend Author: Carlson, Michael Year: 2011 Natural areas and ecosystem services at the edge of urban areas are threatened by increasing development. This paper examines how community based restoration partnerships can work to identify, protect and restore ecosystem services provided by salmon and our local rivers. Floodplains provide a wide range of ecosystem services to urban and rural communities and we should work collaboratively to protect and restore them. Floodplains are especially valuable and important for salmon recovery. By using a case study, we explore the process and feasibility of restoring off-channel salmon habitat at Fisher's Bend in the lower Clackamas river. A feasibility study was conducted to identify costs, benefits and risks of different design alternatives for the side channel. Hydrology of the river and hydraulics of the site were determined by estimating peak and low flow hydrology then running a HEC-RAS hydraulic model. Results indicate that the river overflows into the side channel near the 2 year recurrence interval. On average there is currently about a 50 % chance each year that the river will enter the side channel. These current flows do not provide much opportunity for juvenile salmon to access the side channel where they can grow and thrive in a protected habitat before their journey to the ocean. Further investigation produced results that indicate 95% of the time from 1959-2009 the river discharge was above 726 cfs from October to June. These results highlight that we will need to excavate about 9 feet from current elevations at the side-channel outlet to gain reasonable assurance of a one foot water depth for good salmon access. This depth will provide access from the river during critical periods when adult and juvenile salmon are seeking refuge from predators and high flood flows in the main channel. Although more design is needed for the inlet and outlet it appears the project is feasible and will meet the objective of providing salmonid access to critical habitat. In closing, I recommend investment in natural area protection and restoration at the edges of the urban growth boundary to maintain valuable ecosystem services provided by river floodplains and salmon. Title: Integrating Ecosystem Services, River Restoration and Community: A Case Study at Fisher's Bend Author: Carlson, Michael Year: 2011 Natural areas and ecosystem services at the edge of urban areas are threatened by increasing development. This paper examines how community based restoration partnerships can work to identify, protect and restore ecosystem services provided by salmon and our local rivers. Floodplains provide a wide range of ecosystem services to urban and rural communities and we should work collaboratively to protect and restore them. Floodplains are especially valuable and important for salmon recovery. By using a case study, we explore the process and feasibility of restoring off-channel salmon habitat at Fisher's Bend in the lower Clackamas river. A feasibility study was conducted to identify costs, benefits and risks of different design alternatives for the side channel. Hydrology of the river and hydraulics of the site were determined by estimating peak and low flow hydrology then running a HEC-RAS hydraulic model. Results indicate that the river overflows into the side channel near the 2 year recurrence interval. On average there is currently about a 50 % chance each year that the river will enter the side channel. These current flows do not provide much opportunity for juvenile salmon to access the side channel where they can grow and thrive in a protected habitat before their journey to the ocean. Further investigation produced results that indicate 95% of the time from 1959-2009 the river discharge was above 726 cfs from October to June. These results highlight that we will need to excavate about 9 feet from current elevations at the side-channel outlet to gain reasonable assurance of a one foot water depth for good salmon access. This depth will provide access from the river during critical periods when adult and juvenile salmon are seeking refuge from predators and high flood flows in the main channel. Although more design is needed for the inlet and outlet it appears the project is feasible and will meet the objective of providing salmonid access to critical habitat. In closing, I recommend investment in natural area protection and restoration at the edges of the urban growth boundary to maintain valuable ecosystem services provided by river floodplains and salmon. Close

• 3. [Article] Estuarine Habitat Mitigation in Oregon: Policy Review, Analysis, and Recommended Improvements

  The report is organized in the following manner. After the introductory chapter (Chapter 1), Chapter Two describes Oregon’s current estuarine policy and related state and federal policies. Chapter Three ...

  Citation × Citation Citation Abstract Copy Title: Estuarine Habitat Mitigation in Oregon: Policy Review, Analysis, and Recommended Improvements Author: Buckley, Anna Year: 2006 The report is organized in the following manner. After the introductory chapter (Chapter 1), Chapter Two describes Oregon’s current estuarine policy and related state and federal policies. Chapter Three provides an inventory of recent permitted impacts and associated estuarine resource replacement. Chapter Four consists of a brief summary of the status of estuarine ecology and restoration/mitigation, with knowledge gaps identified. Chapter Five discusses wetland functional assessment tools and options for compensatory mitigation. This chapter begins with a description of the tidal Hydrogeomorphic (HGM) assessment method, how it compares to the estuarine resource replacement rules’ relative values table, and the utility of the tidal HGM in estuarine mitigation. Chapter Five, then, explores alternative mitigation options such as out-of-kind, banking, payment-in-lieu, and conservation in lieu. Chapter Six introduces the concept of incorporating compensatory mitigation into a watershed approach. Based upon the information gathered from the ecological and restoration/mitigation literature and the permit inventory, Chapter Seven outlines recommendations to change the statute, the rules, the standard operating procedures, and other aspects of Oregon’s estuarine resource replacement program. Title: Estuarine Habitat Mitigation in Oregon: Policy Review, Analysis, and Recommended Improvements Author: Buckley, Anna Year: 2006 The report is organized in the following manner. After the introductory chapter (Chapter 1), Chapter Two describes Oregon’s current estuarine policy and related state and federal policies. Chapter Three provides an inventory of recent permitted impacts and associated estuarine resource replacement. Chapter Four consists of a brief summary of the status of estuarine ecology and restoration/mitigation, with knowledge gaps identified. Chapter Five discusses wetland functional assessment tools and options for compensatory mitigation. This chapter begins with a description of the tidal Hydrogeomorphic (HGM) assessment method, how it compares to the estuarine resource replacement rules’ relative values table, and the utility of the tidal HGM in estuarine mitigation. Chapter Five, then, explores alternative mitigation options such as out-of-kind, banking, payment-in-lieu, and conservation in lieu. Chapter Six introduces the concept of incorporating compensatory mitigation into a watershed approach. Based upon the information gathered from the ecological and restoration/mitigation literature and the permit inventory, Chapter Seven outlines recommendations to change the statute, the rules, the standard operating procedures, and other aspects of Oregon’s estuarine resource replacement program. Close