The Afognak Lake sockeye salmon, Oncorhynchus nerka, run severely declined in 2001. Concerns expressed by local subsistence users to the Alaska Dept. of Fish and Game and the U.S. Fish and Wildlife Service Office of Subsistence Management prompted an investigation of the lake's rearing environment in 2003 followed by subsequent annual studies. This report provides 2013 project results and an evaluation of limnology conditions and their effects upon smolt production.
Concerns expressed by local subsistence users over declines in Afognak Lake sockeye salmon Oncorhynchus nerka prompted the Alaska Department of Fish and Game to investigate Afognak Lake's rearing environment. Funded through the U.S. Fish and Wildlife Service Office of Subsistence Management and Alaska Sustainable Salmon Fund, this report provides results from the 2015 season. Based on established mark-recapture techniques, an estimated 133,880 sockeye salmon smolt outmigrated from Afognak Lake in 2015. From 2010 to 2014, the outmigration averaged 258,042 and ranged from 127,861 to 329,948 smolt. Age-1 smolt comprised 84.9% of the outmigration in 2015 and averaged 74.9% of the outmigration from 2010 to 2014. Although age, weight, and condition data indicate fairly healthy, robust smolt, a life-history based model produced a significantly larger estimate, which could indicate poor survival prior to the outmigration. Limnological sampling was conducted during 5 monthly events from May to September in 2015. Phosphorus concentrations and zooplankton densities remained low, while chlorophyll-a levels were slightly above average. Nitrogen concentrations, lake temperatures, and phytoplankton biovolume were above average for the third consecutive year. Nutrient loading in Afognak Lake was influenced mainly by precipitation events (runoff), spring/fall turnover events, and to a lesser extent, wind-induced disturbance and mixing of the benthic substrate. Afognak Lake sockeye salmon returned in sufficient numbers to meet the escapement goal of 20,000-50,000 sockeye salmon and support subsistence, sport, and commercial harvests. The escapement of 38,151 fish in 2015, was slightly below the average of 44,300 sockeye salmon (2014-2014) and predominately composed of age-1.3 and age-1.2 fish.
"This operational plan provides the instruction and procedures to properly operate the Afognak Lake adult salmon escapement weir and successfully meet each project objective. The primary function of maintaining a weir at Afognak River is to enumerate sockeye salmon Oncorhynchus nerka returning to Afognak Lake for the Alaska Department of Fish and Game (ADF&G) management of the Afognak Bay commercial, subsistence, and sport fishery. All fish passing upstream or downstream through the weir are identified, enumerated, and reported to the ADF&G office in Kodiak daily. Enumeration at the weir serves a secondary purpose by providing run timing and escapement information for Kodiak Regional Aquaculture Association (KRAA), which uses Afognak Lake sockeye salmon as an early-run brood stock source for various enhancement projects on Kodiak Island. Project activities at Afognak River weir include installation, operation, and maintenance of the weir, salmonid enumeration, record daily physical weather observation, and the collection of age, sex, and length (ASL) samples and corresponding data."--Page 1
Concerns expressed by local subsistence users over declines in Afognak Lake sockeye salmon Oncorhynchus nerka prompted the Alaska Department of Fish and Game to investigate Afognak Lake's rearing environment. Funded through the U.S. Fish and Wildlife Service Office of Subsistence Management and Alaska Sustainable Salmon Fund, this report provides results from the 2014 season.
Concerns expressed by local subsistence users over declines in Afognak Lake sockeye salmon Oncorhynchus nerka production prompted the Alaska Department of Fish and Game to investigate Afognak Lake?s rearing environment beginning in 2003. Funded through the U.S. Fish and Wildlife Service Office of Subsistence Management, Alaska Sustainable Salmon Fund, and Kodiak Regional Aquaculture Association, this report provides results from the 2016 season. Based on established mark-recapture techniques, an estimated 227,178 sockeye salmon smolt outmigrated from Afognak Lake in 2016. From 2003-2015, the outmigration averaged 319,205 and ranged from 127,861 to 564,793 smolt. Age-1 smolt made up 93.6% of the outmigration in 2016 and averaged 76.9% of the outmigration from 2003 to 2015. Length, weight, and condition data indicate fairly healthy, robust Age-1. smolt over the fourteen years of the project with an average condition factor of 0.81. Limnological sampling was conducted during 5 monthly events from May to September in 2016. Phosphorus concentrations and zooplankton densities remained low, while chlorophyll-a levels were slightly above average. Nitrogen concentrations, lake temperatures, and phytoplankton biovolume were above average for the third consecutive year. Afognak Lake sockeye salmon returned in sufficient numbers to meet the escapement goal of 20,000?50,000 sockeye salmon while supporting subsistence, sport, and commercial harvests. The escapement of 33,167 fish in 2016 was slightly below the average of 41,479 sockeye salmon (2011?2015) and was predominately composed of age-1.3 and age-1.2 fish.
The Afognak Lake sockeye salmon, Oncorhynchus nerka, run severely declined in 2001. Concerns expressed by local subsistence users to the Alaska Dept. of Fish and Game and the U.S. Fish and Wildlife Service Office of Subsistence Management prompted an investigation of the lake's rearing environment in 2003 followed by subsequent annual studies. This report provides 2012 project results and an evaluation of limnology conditions and their effects upon smolt production.
Overviews of the source, supply and variability of DOM, surveys of the processes that mediate inputs to microbial food webs, and syntheses consolidating research findings provide a comprehensive review of what is known of DOM in freshwater. This book will be important to anyone interested in understanding the fundamental factors associated with DOM that control aquatic ecosystems."--BOOK JACKET.
A must for biologists, resource assessment workers, forestry workers, salmon enhancement groups, naturalists, fisheries students and members of the public interested in fisheries projects.
This Companion is comprised of 27 original contributions by leading scholars in the field and summarizes the state of anthropological knowledge of Indian peoples, as well as the history that got us to this point. Surveys the full range of American Indian anthropology: from ecological and political-economic questions to topics concerning religion, language, and expressive culture Each chapter provides definitive coverage of its topic, as well as situating ethnographic and ethnohistorical data into larger frameworks Explores anthropology’s contribution to knowledge, its historic and ongoing complicities with colonialism, and its political and ethical obligations toward the people 'studied'
In its statutory authority (National Science Foundation Act of 1950, as amended), the NSF is directed to both initiate and support basic scientific research. In its Ecology Program, one mode of initiating research is to en courage the development of new ideas through advisory workshops. The NSF is specifically directed to strengthen our nation's research potential. In addition, stimulating new approaches to research will continue to be prominent in the coming years as federal attention is given to increasing the innovativeness and competitiveness of the U. S. in science and engineering. A decision to initiate a workshop does not arise de novo in the Ecology Program. Rather, it emerges from panel discussions, conversations with in vestigators at meetings or on the phone, and from discussions between pro gram officers in the Division of Biotic Systems and Resources. This workshop was developed to provide advice to the NSF and the lim nological community. Some NSF perceptions on future funding for ecolog ical research on lake communities are presented here. Researchers often mentioned a paucity of innovative lake ecology at the community level. This perception was accompanied by a certain frustration since lakes probably have the best empirical data base of any natural environment and should continue to lead in the development of ecological concepts. Members of NSF advisory panels sometimes expressed similar concerns during consid eration of proposals for lake research.
