Perry, Stephen

EBTJV Management Structure: The document describes the EBTJV Steering Committee's Charter/By-Laws.
Located in Groups / Steering Committee
SEACAP: Southeast Aquatic Connectivity Assessment Project: Assessing the ecological impact of dams on Southeastern rivers.: This report provides details about the data, methods, results, and tools developed for SEACAP.
Located in Science and Data / Aquatic Organism Passage I&A and state design guidelines
Northeast Aquatic Connectivity: An Assessment of Dams on Northeastern Rivers.: A report that describes an approach to strategically reconnect fragmented river, stream, coastal, reservoir, lake and estuarine habitat by removing or bypassing key barriers to fish passage.
Located in Science and Data / Aquatic Organism Passage I&A and state design guidelines
Chesapeake Fish Passage Prioritization: An Assessment of Dams in the Chesapeake Bay Watershed.: Prioritizing fish passage barriers.
Located in Science and Data / Aquatic Organism Passage I&A and state design guidelines
Modified Culvert Inventory and Assessment Protocol: This culvert inventory and assessment method is a modified version of the National Inventory and Assessment Procedure developed to collect data needed to run coarse filter evaluations of fish passage.
Located in Science and Data / Aquatic Organism Passage I&A and state design guidelines
Aquatic Organism Passage I&A and state design guidelines: This folder contains documents related to aquatic organism passage inventory and assessment protocols and design guidance from state partners.
Located in Science and Data
10th International Charr Symposium in Japan: First Announcement: The International Symposium on Charr (genus Salvelinus) attracts a diverse community that uses charr in research, recreation, and as a food resource.
Located in News & Events / News Inbox
Individual behaviour and resource use of thermally stressed brook trout Salvelinus fontinalis portend the conservation potential of thermal refugia: Individual aggression and thermal refuge use were monitored in brook trout Salvelinus fontinalis in a controlled laboratory to determine how fish size and personality influence time spent in forage and thermal habitat patches during periods of thermal stress. On average, larger and more exploratory fish initiated more aggressive interactions and across all fish there was decreased aggression at warmer temperatures. Individual personality did not explain changes in aggression or habitat use with increased temperature; however, larger individuals initiated comparatively fewer aggressive interactions at warmer temperatures. Occupancy of forage patches generally declined as ambient stream temperatures approached critical maximum and fish increased thermal refuge use, with a steeper decline in forage patch occupancy observed in larger fish. These findings suggest that larger individuals may be more vulnerable to stream temperature rise. Importantly, even at thermally stressful temperatures, all fish periodically left the thermal refuge to forage. This indicates that the success of refugia at increasing population survival during periods of stream temperature rise may depend on the location of thermal refugia relative to forage locations within the larger habitat mosaic. These results provide insights into the potential for thermal refugia to improve population survival and can be used to inform predictions of population vulnerability to climate change.
Located in Science and Data / Brook Trout Related Publications
Evaluating the Trade-Offs between Invasion and Isolation for Native Brook Trout and Nonnative Brown Trout in Pennsylvania Streams: A popular conservation strategy for native trout species in western North America is to prevent invasions by nonnative trout by installing barriers that isolate native trout populations into headwater streams. In eastern North America, native Brook Trout Salvelinus fontinalis are frequently replaced in coolwater habitats by nonnative Brown Trout Salmo trutta and relegated to small headwater streams. In this study, we compared the effects of isolation and invasion by nonnative Brown Trout on the distribution and demographic structure of Brook Trout populations from 78 trout streams in northwestern Pennsylvania. The Brook Trout and Brown Trout distributions varied in predictable ways along the stream size gradient, with Brown Trout becoming dominant in larger streams. However, there was a prominent barrier effect, with streams 12 times more likely to have Brook Trout than Brown Trout when a downstream barrier was present between the sample site and the nearest Brown Trout stocking location. In comparison, 91% of the streams with Brown Trout had no downstream barrier, suggesting that barriers are important in creating refugia for Brook Trout. Brown Trout also appeared to have a negative impact on Brook Trout population demographics, as Brook Trout populations in sympatry with Brown Trout had fewer age-classes and lower population densities than allopatric Brook Trout populations. Isolating Brook Trout to small headwater streams with downstream barriers that prevent Brown Trout invasion could be a viable conservation strategy in regions where barriers would serve to reduce the negative impacts from Brown Trout. Since barriers could further fragment local Brook Trout populations, however, they would need to be strategically placed to allow for seasonal movements to maintain metapopulation structure and ensure population persistence.
Located in Science and Data / Brook Trout Related Publications
Brook Trout Thermal Habitat Forecasts Catoctin Mountain Park, Maryland & Shenandoah Valley, Virginia: Users can zoom-in to an area of interest and then compare current conditions against various future scenarios (3 levels of air temperature change x 3 levels of GW sensitivity to air temperature change). The interpretation is simple: red sites are too warm (MWAT > 23 C) and blue sites have suitable temperatures.
Located in Science and Data / Data and Brook Trout Decision Support Tools

« Previous 10 items Next 10 items » 1 2 [3] 4 5 6 7 ... 37

Sections

Personal tools

Search results