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Effects Of Climate And Density On The Distribution Growth And Life History Of Juvenile Sockeye Salmon Oncorhynchus Nerka In Iliamna Lake Alaska
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Book Synopsis Effects of Climate and Density on the Distribution, Growth, and Life History of Juvenile Sockeye Salmon (Oncorhynchus Nerka) in Iliamna Lake, Alaska by : Harry B. Rich
Download or read book Effects of Climate and Density on the Distribution, Growth, and Life History of Juvenile Sockeye Salmon (Oncorhynchus Nerka) in Iliamna Lake, Alaska written by Harry B. Rich and published by . This book was released on 2006 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Canadian Journal of Fisheries and Aquatic Sciences by :
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 2009 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Climate Change and Geomorphic Evolution in an Alaskan Watershed and Implications for Salmon Production by : Jennifer Rhiannon Griffiths
Download or read book Climate Change and Geomorphic Evolution in an Alaskan Watershed and Implications for Salmon Production written by Jennifer Rhiannon Griffiths and published by . This book was released on 2012 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freshwater ecosystems are not only the source of a disproportionate number of ecosystem services given their relative area on the planet, but they are also highly sensitive to anthropogenic impacts including climate change. Landscape heterogeneity provides a filter for regional climate forcing in aquatic systems and provides the context in which the biological components of ecosystems will interact with climate change. I used the Chignik watershed, Alaska as a case study in which to explore the response of juvenile sockeye salmon (Oncorhynchus nerka) growth and body condition to differences across habitats and variation in climate. Furthermore, I investigated the interaction of climate change and geomorphic evolution and its effects on juvenile sockeye salmon habitat and growth. I used genetic tools to assess individual performance of sockeye salmon among connected freshwater habitats. I found that individual performance converged on habitat productivity rather than being determined by genetic origin. I investigated the effects of climate variability on juvenile salmon growth among lake habitats using 40 years of freshwater growth data from scales. Growth showed a coherent response to climate variables affecting growing season duration but opposing responses to growing season temperatures. This indicated that different lake habitats not only filter regional climate differently but that this leads to differences in the biological response. Juvenile sockeye salmon length data over a similar time frame indicated that temperature had a greater effect on growth than sockeye density. Finally, I assessed the relative importance of air temperature, lake volume and tributary for lake thermal regimes and juvenile sockeye salmon growth. Increases in lake volume had little effect on lake thermal regimes which were highly sensitive to lake temperature. Future increases in air temperature will likely reduce growth of juvenile sockeye although maintaining tributary connectivity is important to reducing the effects of air temperature. Because uncertainty exists in how freshwater ecosystems will respond to climate change preserving networks of heterogeneous habitat may be critical to supporting ecosystem resilience. Intact ecosystems provide an opportunity to evaluate the relative importance of climate, geomorphology and connectivity for salmon populations and inform the management and restoration of impacted landscapes.
Book Synopsis Variation in the Early Life History of Sockeye Salmon (Oncorhynchus Nerka) by : Caryn A. Abrey
Download or read book Variation in the Early Life History of Sockeye Salmon (Oncorhynchus Nerka) written by Caryn A. Abrey and published by . This book was released on 2005 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Canada. Department of Fisheries and Oceans Publisher :Fisheries and Oceans, Information and Publications Branch ISBN 13 : Total Pages :508 pages Book Rating :4.:/5 (31 download)
Book Synopsis Sockeye Salmon (Oncorhynchus Nerka) by : Canada. Department of Fisheries and Oceans
Download or read book Sockeye Salmon (Oncorhynchus Nerka) written by Canada. Department of Fisheries and Oceans and published by Fisheries and Oceans, Information and Publications Branch. This book was released on 1987 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: A three-day symposium was organized by the Department of Fisheries and Oceans and convened at Nanaimo, British Columbia in November 1985. Advice on subject matter and participation came from an external committee of senior scientists and administrators in contributing agencies in Canada, Japan, the United States, and the Union of Soviet Socialist Republics. The papers included in the proceedings deal with sockeye biology and stock management. Papers on sockeye biology are divided into those concerned primarily with life history strategies and enhancement and development. Papers dealing with management are divided into the tools of management and management of some principal stocks.
Author :Jeremy M. B. Hume Publisher :Cultus Lake, B.C. : Fisheries and Oceans Canada, Science ISBN 13 : Total Pages :126 pages Book Rating :4.:/5 (31 download)
Book Synopsis An Assessment of the Juvenile Sockeye Salmon (Oncorhynchus Nerka) Populations of Babine Lake by : Jeremy M. B. Hume
Download or read book An Assessment of the Juvenile Sockeye Salmon (Oncorhynchus Nerka) Populations of Babine Lake written by Jeremy M. B. Hume and published by Cultus Lake, B.C. : Fisheries and Oceans Canada, Science. This book was released on 2000 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Juvenile sockeye salmon rearing in Babine Lake were re-examined 22 years after the initiation of the Babine Lake Development Project (BLDP). Abundance, distribution, size, and species composition of the limnetic fish populations, including juvenile sockeye salmon, were determined by hydroacoustic and midwater trawl surveys in the autumn of 1993 and the summer and fall of 1994 and 1995 and compared to results collected before and shortly after the start of the BDLP. Our objectives were to look for: 1) changes in the abundance of juvenile sockeye relative to spawning numbers; 2) changes in the utilization of the available nursery area; and 3) the effects of increased popualtion size and density on the size and growth of juvenile sockeye.
Book Synopsis Age, Growth and Productivity of Juvenile Sockeye Salmon in Two High Latitude Lakes, Alaska by : Lorna I. Wilson
Download or read book Age, Growth and Productivity of Juvenile Sockeye Salmon in Two High Latitude Lakes, Alaska written by Lorna I. Wilson and published by . This book was released on 2009 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The growth of Seward Peninsula sockeye salmon (Oncorhynchus nerka) from Salmon and Glacial lakes is related to their physical environment. Dermal scales collected over many years were measured to document the annual age specific growth of smolts and adults. The effect of fertilization on fry growth was examined using the first year of growth. The growth histories of Salmon Lake sockeye salmon were compared to Glacial Lake sockeye salmon through smolting and in the marine environment. Annual age specific fry growth had no direct relationship to fertilization; however, there were interactions between biomass of salmon prey and fertilization, and between prey biomass and age of smolting. Glacial Lake age-1 smolts are the same size as Salmon Lake age-1 smolts, but age-1.3 Salmon Lake juveniles after their first year in the ocean are smaller than age-1.3 Glacial Lake juveniles suggesting lower size based mortality. The differences in growth histories show each population's response to lake production and mortality experienced by smolt between the rearing lake and the ocean"--Leaf iii.
Book Synopsis Distribution, Abundance, and Growth of Juvenile Sockeye Salmon, Oncorhynchus Nerka, and Associated Species in the Naknek River System, 1961-64 by : Robert J. Ellis
Download or read book Distribution, Abundance, and Growth of Juvenile Sockeye Salmon, Oncorhynchus Nerka, and Associated Species in the Naknek River System, 1961-64 written by Robert J. Ellis and published by . This book was released on 1974 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Assessing Juvenile Sockeye Salmon (Oncorhynchus Nerka) Energy Densities and Their Habitat Quality in the Chignik Watershed, Alaska by : Heather Finkle
Download or read book Assessing Juvenile Sockeye Salmon (Oncorhynchus Nerka) Energy Densities and Their Habitat Quality in the Chignik Watershed, Alaska written by Heather Finkle and published by . This book was released on 2004 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Chignik watershed, on the southern side of the Alaska Peninsula, supports a large salmon fishery vital to the local economy. Recent morphological changes to the watershed generated concern regarding the sockeye salmon (Oncorhynchus nerka) stock that rears in Black Lake, at the head of the system. Studies of the Chignik watershed to date have not incorporated energy density data to explain the life history strategies of Chignik sockeye salmon. Re-estimated condition factor parameters improved our understanding of the length-weight relationships to fish health that isometric models described in Chignik sockeye salmon. Subsequent comparisons of age, length, weight, location, and temperature data to energy density indicated that Black Lake fish, which were all age 0 fish, were significantly affected by temperature and had energy densities greater than did fish from other areas of the watershed. Sockeye salmon captured in Chignik Lake, Chignik River, and Chignik Lagoon were only energetically different from one another based on age. Observed seasonal trends suggested juvenile sockeye salmon emigrate from Black Lake before the onset of winter due to forage and temperature limitations. A constant downstream migration occurred in the watershed during the summer, which suggested smoltification and osmoregulation processes in Chignik Lagoon fish"--Leaf iii.
Book Synopsis Biology of Juvenile Sockeye Salmon Resident in Chignik River, Alaska by : Ronald Albert Iverson
Download or read book Biology of Juvenile Sockeye Salmon Resident in Chignik River, Alaska written by Ronald Albert Iverson and published by . This book was released on 1966 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The life history of juvenile sockeye salmon (Oncorhynchus nerka) resident in Chignik River, Alaska, represents a departure from the lacustrine, pelagic existence typical of juveniles of this species. For this reason, the distribution, relative abundance in different parts of the river, growth, and upstream and downstream movements of juvenile sockeye in the river were studied during the summers of 1963 and 1964. The objectives of the study were to gain information on the possible origins of juvenile sockeye resident in Chignik River, and on the role of Chignik River in production of sockeye salmon. Distribution and abundance were estimated by seining and underwater observation. Juvenile sockeye appeared to be restricted to quiet waters along the shore. Catches of sockeye fry tended to increase through the summer, whereas catches of yearlings decreased. Smolts were taken in significant numbers only in June and July. early summer, large numbers of yearling sockeye were concentrated in Chignik River just below the outlet of Chignik Lake. In sockeye fry and yearlings captured in the lower river were generally larger than those captured in the upper river. Juvenile sockeye in the upper river grew slower than those in most other parts of the watershed. Scale analysis of sockeye salmon spawning in Chignik River showed that these fish entered the ocean at a larger size than did fish reared in Chignik Lake or Chignik River. This suggests that at least part of the progeny of river spawners do not remain in the river, but descend as fry to the brackish estuary, where growth conditions are superior. Upstream movement of schools of yearling sockeye was observed in the upper portions of the river. Such a movement has been observed many times in Chignik River in past years and has at times involved large numbers of fish. Schools of yearling sockeye have been observed to enter Chignik Lake. Fish of the same size group were captured while moving downstream at the lake outlet at night, suggesting a circular movement involving displacement of fish into the river at night and a positive rheotactic response causing them to re-enter the lake during the day. Juvenile sockeye salmon resident in Chignik River may include both progeny of river spawners, and fish which have moved down from Chignik Lake; Chignik Lake is probably the more important source. Chignik River is judged to have a minor role in the production of sockeye salmon, relative to the other rearing areas in the watershed.
Book Synopsis The Role of Life History and the Environment in Population Dynamics of Sockeye Salmon (Oncorhynchus Nerka) by : Douglas Clifford James Braun
Download or read book The Role of Life History and the Environment in Population Dynamics of Sockeye Salmon (Oncorhynchus Nerka) written by Douglas Clifford James Braun and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Processes linking the environment and life histories are central to our understanding of population dynamics. This thesis combines life history theory and environmental variation to explain recruitment dynamics among populations in Fraser River sockeye salmon (Oncorhynchus nerka). I first explore relationships between spawning stream characteristics and spawning densities and show that streams with more cover have higher spawning densities. Next, I use a 21-year time series for three of these populations to explore hypotheses about how maternal life history traits and migration conditions, experienced during upstream migrations to their spawning grounds, influence reproductive investment. Maternal body size is strongly linked to total reproductive investment and both egg mass and fecundity; however, migration difficulty only influences egg mass and not fecundity. Using the same dataset, I show that egg mass and incubation temperatures influence juvenile fitness-related traits including length, mass and emergence timing. The main finding from these analyses, that warmer incubation temperatures result in lighter juveniles that emerge earlier, led to hypotheses about how incubation temperature might select for egg size among populations. I tested these hypotheses by comparing 16 populations and confirmed the prediction that in streams with warmer water, fish would produce heavier eggs. I then asked if these same maternal traits and environmental conditions would relate to adult recruitment dynamics. Populations spawning in streams with deeper water had higher maximum population growth rates and less variable recruitment. In addition, populations in streams with larger gravel exhibited stronger density-dependence. Finally, I develop a novel framework for evaluating how habitat data, combined with the cost of collecting such information, can be used in developing cost-effective surveys. I demonstrate this general framework with a simple example using the relationships between stream characteristics and sockeye densities, considering the costs and effectiveness of stream variables. Overall, this demonstration of the joint role of maternal traits and environmental conditions in recruitment dynamics supports the potential use of such variables as indicators of population dynamics in the absence of long-term demographic data. Furthermore, it supports the development of cost-effective surveys, which is important as human impacts on populations increase, and as monitoring resources decline.
Book Synopsis The Behavior and Ecology of Pacific Salmon and Trout by : Thomas P. Quinn
Download or read book The Behavior and Ecology of Pacific Salmon and Trout written by Thomas P. Quinn and published by UBC Press. This book was released on 2011-11-01 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Behavior and Ecology of Pacific Salmon and Trout explains the patterns of mate choice, the competition for nest sites, and the fate of the salmon after their death. It describes the lives of offspring during the months they spend incubating in gravel, growing in fresh water, and migrating out to sea to mature. This thorough, up-to-date survey should be on the shelf of everyone with a professional or personal interest in Pacific salmon and trout. Written in a technically accurate but engaging style, it will appeal to a wide range of readers, including students, anglers, biologists, conservationists, legislators, and armchair naturalists.
Book Synopsis Some Aspects of the Comparative Ecology of Fishes Associated with Juvenile Sockeye Salmon, Oncorhynchus Nerka (Walbaum), in the Lakes of the Naknek River System, Alaska by : Richard L. Wallace
Download or read book Some Aspects of the Comparative Ecology of Fishes Associated with Juvenile Sockeye Salmon, Oncorhynchus Nerka (Walbaum), in the Lakes of the Naknek River System, Alaska written by Richard L. Wallace and published by . This book was released on 1969 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the distribution, relative abundance and diet of fishes sympatric with juvenile sockeye salmon, Oncorhynchus nerka (Walbaum), within the freshwater nursery areas of the Naknek River system was undertaken from 1961 to 1963. The study was part of an extensive investigation to determine what factors in the freshwater environment were limiting the size of the populations of sockeye salmon returning to the rivers of Bristol Bay, Alaska. The speties found associated with juvenile salmon in the limnetic zones of the Naknek system were the pond smelt, Hypomesus olidus (Pallas); the least cisco, Coregonus sardinella Valenciennes; the threespine stickleback, Gasterosteus aculeatus Linnaeus; and the ninespine stickleback, Pungitius pungitius (Linnaeus). Life history information was collected for these sympatric species. Tow nets were used to capture samples of fish from the limnetic portions of the nursery areas. Some samples were collected by beach seines, lake traps and otter trawls. Plankton samples were collected and compared to the diets of the limnetic fishes. Although some confusion has existed in the literature, I concluded that pond smelt of the Naknek system belong to Hypomesus olidus (Pallas). The populations of smelt were comprised of six age-groups in the late summer, but most specimens belonged to three age-groups. Most members of the species spawn in the spring of the fourth year of life. The estimated fecundity ranged from 900 to 4,300 eggs per female. Seven age-groups of least ciscoes were present in the populations of the Naknek system. The species in the Naknek system probably spawned for the first time in the fall of their fourth year. The estimated fecundity of two specimens was 4,006 and 14,380 eggs. Populations of three spine stickleback were comprised of three age-groups of fish. I was unable to assign ages to ninespine stickleback. Estimates of the fecundity of the species ranged from 116 to 456 eggs per female. All species studied were distributed throughout the Naknek system. The relative abundance of the fishes studied was variable between and within nursery areas and from year to year. The population densities of pond smelt and threespine stickleback were larger in the surface waters compared to the deep waters. The relative abundance of sockeye fry, yearlings and ninespine stickleback was greater in the surface stratum rather than the deep stratum in most nursery areas. The five main food items utilized by these limnetic species were cladocerans (Bosmina sp. and Daphnia sp.); copepods (cyclopoid copepods and Diaptomus sp.); and Dipteran insects. Analysis of the similarity of diets indicated that the diets of sockeye fry and pond smelt were more similar than were the diets of sockeye fry or yearlings and any other sympatric species. The diet of sockeye fry was more similar to that of either species of stickleback than was the diet of sockeye yearlings. An analysis of the food of various sizes of each species of fish indicated the diets of three age-groups of smelt were more similar than the diets of various age-groups of any other fish. The food composition of three age-groups of ciscoes and two size groups of both species of stickleback showed a strong positive correlation. The diets of sockeye fry and yearlings showed the weakest positive correlation of the species studied. All species of fish studied selectively fed on one or more components of the zooplankton. Daphnia sp. and cyclopoid copepods were strongly selected in Lake Coville. Cyclopoids were selected in South Bay. Bosmina sp. was selected from the waters of West End. In Lake Coville, the greatest potential competition for food probably existed between the large populations of pond smelt and sockeye fry. In the West End nursery area, potential competition between juvenile salmon and both species of stickleback may not be severe, depending on the age composition of the salmon population present in the nursery area. The possibility exists that the relatively low numbers of adult sockeye salmon returning to the comparatively rich lakes of the Naknek River system is due to the presence of large populations of sympatric species of fish. Each of these sympatric species feed on the same general types of food organisms as do the juvenile salmon and may affect the numbers of young salmon that leave the lake, and subsequently return from the ocean.
Book Synopsis Evidence for Temperature Limitation of Juvenile Sockeye Salmon (Oncorhynchus Nerka) Growth in Hugh Smith Lake, Alaska by : Larry Peltz
Download or read book Evidence for Temperature Limitation of Juvenile Sockeye Salmon (Oncorhynchus Nerka) Growth in Hugh Smith Lake, Alaska written by Larry Peltz and published by . This book was released on 1989 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Distribution, Abundance, and Growth of Juvenile Sockeye Salmon, Oncorhynchus Nerka, and Associated Species in the Naknek River System, 1961-64 (Classic Reprint) by : Robert J. Ellis
Download or read book Distribution, Abundance, and Growth of Juvenile Sockeye Salmon, Oncorhynchus Nerka, and Associated Species in the Naknek River System, 1961-64 (Classic Reprint) written by Robert J. Ellis and published by Forgotten Books. This book was released on 2016-10-08 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Distribution, Abundance, and Growth of Juvenile Sockeye Salmon, Oncorhynchus Nerka, and Associated Species in the Naknek River System, 1961-64 In the summers of 1961 to 1963, juvenile sockeye salmon in the pelagic areas had a characteristic pattern of abundance. For the entire system: abundance (catch per tow) of age 0 increased from early summer to midsummer and then declined to late August. The abundance in late August varied about threefold and, in general, was independent of variations in the number of parents from 1960 to 1963. In July the abundance of age 0 fish in each basin was proportional to the amount of known contiguous spawning ground, but by late August this relation no longer existed. This change was at least partly due to migration of the age 0 fish - generally from basins of greater abundance of fish to those of lesser abun dance. The larger and faster growing fish were the first to migrate. Not all basins were involved in these migrations. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Book Synopsis Growth of Juvenile Sockeye Salmon, Oncorhynchus Nerka (Walbaum), in Auke Lake, Alaska by : Garvan Pat Bucaria
Download or read book Growth of Juvenile Sockeye Salmon, Oncorhynchus Nerka (Walbaum), in Auke Lake, Alaska written by Garvan Pat Bucaria and published by . This book was released on 1968 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Lake Fertilization on Growth of Juvenile Sockeye Salmon (Oncorhynchus Nerka Walbaum) in Lake McDonald, Tongass National Forest, Alaska by : Ronald P. Olson
Download or read book Effects of Lake Fertilization on Growth of Juvenile Sockeye Salmon (Oncorhynchus Nerka Walbaum) in Lake McDonald, Tongass National Forest, Alaska written by Ronald P. Olson and published by . This book was released on 1989 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Purpose of this study was to measure the effect of lake fertilization on growth of juvenile sockeye salmon (Oncorhynchus nerka Walbaum) in Lake McDonald, Tongass National Forest, Alaska. Lake was fertilized to increase phosphorus base load.
