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A Model To Link Habitat Supply To Population Dynamics For Lake Trout Salvelinus Namaycush Populations In Western Lake Superior
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Book Synopsis A Model to Link Habitat Supply to Population Dynamics for Lake Trout (Salvelinus Namaycush) Populations in Western Lake Superior by : John Netto (Ph. D.)
Download or read book A Model to Link Habitat Supply to Population Dynamics for Lake Trout (Salvelinus Namaycush) Populations in Western Lake Superior written by John Netto (Ph. D.) and published by . This book was released on 2006 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Role of Compensatory Mechanisms in the Population Dynamics of Lake Trout (Salvelinus Namaycush) in the U.S. Waters of Lake Superior by : Cecilia Paola Ferrero
Download or read book Role of Compensatory Mechanisms in the Population Dynamics of Lake Trout (Salvelinus Namaycush) in the U.S. Waters of Lake Superior written by Cecilia Paola Ferrero and published by . This book was released on 1995 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling Individual Variability in Growth and Its Importance by : Elizabeth Stebbins
Download or read book Modeling Individual Variability in Growth and Its Importance written by Elizabeth Stebbins and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Correctly characterizing growth of fish within a population is a crucial component of fish biology and fishery management because, among other things, it informs population dynamics that affect management decisions. Size-at-age is a common metric of fish growth and is often measured at the population level with the assumption that, on average, all fish of a given age are a given size. Over time, several studies have shown that ignoring individual variability in growth can influence population parameter estimates and these inaccuracies can be propagated in population models that are used to calculate reference points for management. In the first chapter we develop a hierarchical, mixed-effects statistical growth model that measures individual variability in growth model parameters and partitions it into two sources. We fit this model to length-at-age data of lake trout (Salvelinus namaycush) from six populations in Lake Superior and show that individual-level variability exceeds population-level variability for this system, and persistent error contributes more to variability in length-at-age. In our second chapter, we simulate a population of fish and predict biological reference points, yield-per-recruit, and spawning stock biomass-per-recruit curves from the population using a 'standard' method that ignores individual variability and a 'true' method that accounts for size-selective mortality and its interaction with individual fish. We show that ignoring individual variability in these models results in overestimation of yield-per-recruit and the biological reference points F0.1 and FMAX. Further, spawning stock biomass-per-recruit is underestimated at low levels of fishing intensity and overestimated at high levels of fishing intensity when individual variability is ignored.
Author :B. A. Henderson Publisher :Ontario, Ministry of Natural Resources, Fisheries Branch ISBN 13 : Total Pages :26 pages Book Rating :4.3/5 (243 download)
Book Synopsis The Population Dynamics of Lake Trout (Salvelinus Namaycush) in Lake Manitou, in Relation to the Planting and Spawn-taking Operation by : B. A. Henderson
Download or read book The Population Dynamics of Lake Trout (Salvelinus Namaycush) in Lake Manitou, in Relation to the Planting and Spawn-taking Operation written by B. A. Henderson and published by Ontario, Ministry of Natural Resources, Fisheries Branch. This book was released on 1982 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Habitat Suitability Index Models by : Robert F. Raleigh
Download or read book Habitat Suitability Index Models written by Robert F. Raleigh and published by . This book was released on 1982 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dynamics of Lake Trout (Salvelinus Namaycush) by : Christopher Todd Weeks
Download or read book Dynamics of Lake Trout (Salvelinus Namaycush) written by Christopher Todd Weeks and published by . This book was released on 1997 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Climate Change on North-temperate Lake Trout (Salvelinus Namaycush) Populations by : Matthew Michael Guzzo
Download or read book The Effects of Climate Change on North-temperate Lake Trout (Salvelinus Namaycush) Populations written by Matthew Michael Guzzo and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aquatic ecosystems are expected to undergo major changes in response to climate change. Lake trout (Salvelinus namaycush) is predatory fish found in oligotrophic lakes of Canada and is considered a sentinel species for studying the impacts of warming on lakes due to its requirement for cold water. The objective of this thesis was to determine the impacts of warming on north-temperate lake trout populations. In Chapters 1-3, I used long-term datasets collected from small lakes near the southern extent of lake trout's distribution to determine how warming impacts thermal habitat and how these habitat changes cascade to alter the behaviour and growth of individuals and ultimately population-level characteristics of this species. I found that over a period when annual air temperatures increased by ≈ 2 ̊C there was a 14-day reduction, on average, in the ice-free season and an equal extension of summer - a period when littoral zone temperatures exceed the metabolic optimal for lake trout. Years with shorter springs and longer summers negatively impacts lake trout by limiting access to littoral prey, resulting in slower growth and reduced condition. I also found that the growth and size structure of an unexploited lake trout population shifted during this warming period; the population is now made up of a larger number of small individuals with lower condition and reduced life span. Lake trout also began to mature at younger ages and had reduced maximum size. Results suggest these changes in size-structure were not due to changes in the amount or size of prey fish or density-dependence, as the biomass of adult lake trout remained constant over time. In Chapter 4, I collected data from a northern lake to describe the seasonal ecology of this northern lake trout population and predict how warming might alter growth. I found that lake trout displayed similar seasonal cycles in habitat use and diet as in southern lakes, but that the use of littoral habitat was far reduced, likely due to the presence of pelagic prey fish and northern pike (Esox lucius) in this lake. Lastly, bioenergetic simulations indicated that the under a 2 ̊C warming scenario, the growth and consumption of lake trout would increase in this northern lake assuming prey was readily available.
Book Synopsis Patterns and Causes of Life History Variation in Lake Trout, Salvelinus Namaycush by : Jenni L. McDermid
Download or read book Patterns and Causes of Life History Variation in Lake Trout, Salvelinus Namaycush written by Jenni L. McDermid and published by . This book was released on 2007 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lake trout (Salvelinus namaycush) exhibit substantial life history variation across their range, but considerable local variation also occurs. Life history traits play a critical role in shaping population dynamics. As such, the observed life history variation makes it difficult to build conservation and management models. Populations should respond to varied environmental conditions by selecting the most favourable combination of life history traits. However, life history traits may alter as a result of phenotypic plasticity and/or genetic response to environmental conditions. This thesis examines the degree and mechanisms behind life history variation in lake trout. Variability is examined over the species range and within small geographic areas. Results indicate a strong association between enviromnental and lake trout life history variability. In particular, climate variables such as net thermal input and winter length and severity are correlated with a number of lake trout life history characteristics across the range. Lake morphology was associated with asymptotic sizes of lake trout, and shows contrasting associations with longevity and size at maturity in northern versus southern ranges. On a local scale, divergence in life history traits represented a combination of plastic responses and genetic adaptations to local conditions. The majority of life history traits examined in this thesis appeared to have a genetic basis; however stunted populations showed a plastic response to lack of forage fish. Yet, not all stunted populations within a region showed similar adaptive responses in early life history characteristics and we propose that the different responses may be predator mediated. Finally, the phenotypic divergence in life history traits among populations introduced from a common source approximately a century ago exhibited rapid plastic and genetic responses to novel environments. This thesis identifies that both plastic and genetic responses are common in lake trout, that these responses can occur quite rapidly, and that a significant number of environmental variables need to be considered before we can predict life history variation. These findings may be even more critical as populations continue to face stresses from climate change, overexploitation, habitat destruction, and introduced species.
Book Synopsis Biomass Dynamics of Lake Trout (Salvelinus Namaycush) in Lake Superior, 1948-1976 by : Lawrence Dean Jacobson
Download or read book Biomass Dynamics of Lake Trout (Salvelinus Namaycush) in Lake Superior, 1948-1976 written by Lawrence Dean Jacobson and published by . This book was released on 1986 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Habitat Suitability Index Model for Brook Trout in Streams of the Southern Blue Ridge Province by : Christopher J. Schmitt
Download or read book Habitat Suitability Index Model for Brook Trout in Streams of the Southern Blue Ridge Province written by Christopher J. Schmitt and published by . This book was released on 1993 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spatial and Thermal Ecology of Lake Trout (salvelinus Namaycush) in Lake Erie by : Tyler R. Funnell
Download or read book Spatial and Thermal Ecology of Lake Trout (salvelinus Namaycush) in Lake Erie written by Tyler R. Funnell and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rehabilitation of lake trout (Salvelinus namaycush), which historically was the coldwater apex predator of much of the Laurentian Great Lakes, is a priority for fishery management agencies in the region. In Lake Erie, the shallowest and southern-most Great Lake, successful rehabilitation of lake trout has been hindered by limited wild recruitment, possibly related to the lake's warm temperatures and restricted oxythermal habitat. I used acoustic telemetry tracking technology to investigate how lake trout spatial and thermal habitat use varies seasonally in Lake Erie to better understand whether limited recruitment could be caused by thermal conditions in the lake. As expected, lake trout were restricted to the offshore region of the eastern basin of Lake Erie during summer stratification. During fall, lake trout tended to occupy the southern nearshore region of the eastern basin, suggesting the importance of focusing spawning habitat restoration in this part of the lake. Tagged fish dispersed long distances at much higher frequencies than other Great Lakes populations of lake trout. Lake trout in Lake Erie occupied thermal habitat similar to other Great Lakes populations during summer stratification. Following destratification in fall, fish were exposed to warm temperatures, in some years for extended periods. Lake trout hatchery strains of Finger Lakes, NY, origin occupied similar summer temperatures and warm temperatures for more days during fall than Great Lakes origin strains, contrary to findings from Lakes Huron and Ontario. These results reveal behaviors that can inform management of lake trout in Lake Erie and throughout the Great Lakes and could begin to explain recruitment failure observed in Lake Erie.
Book Synopsis Effects of Exploitation, Loss of Nursery Habitat, and Stocking on the Dynamics and Productivity of Lake Trout Populations in Ontario Lakes by : David Owen Evans
Download or read book Effects of Exploitation, Loss of Nursery Habitat, and Stocking on the Dynamics and Productivity of Lake Trout Populations in Ontario Lakes written by David Owen Evans and published by . This book was released on 1991 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report used creel survey information, lake survey information, fisheries assessment data, and population modelling to evaluate the effects of angling exploitation, loss of deep-water nursery habitat, and stocking of hatchery-reared, non-native stocks of lake trout on the dynamics of lake trout populations in Ontario lakes.
Book Synopsis Habitat Suitability Index Models by : Terry Hickman
Download or read book Habitat Suitability Index Models written by Terry Hickman and published by . This book was released on 1982 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis FROM INDIVIDUAL ATTRIBUTES TO POPULATION DYNAMICS AND WHOLE COMMUNITY STABILITY IN AQUATIC SYSTEMS. by : Amanda Caskenette
Download or read book FROM INDIVIDUAL ATTRIBUTES TO POPULATION DYNAMICS AND WHOLE COMMUNITY STABILITY IN AQUATIC SYSTEMS. written by Amanda Caskenette and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The way ecologists study the world creates boundaries between individual, population, and community scales. All scales interact, however, and changes in function or stability at one scale resonates at all other scales. Starting from the individual scale, this thesis crosses these artificial boundaries and determines the effect of individual behaviour, size, and life-stage on population density, energy flow in food webs, and food web stability. Chapter 1 uses a novel approach to test the behavioural mechanism behind how changes in resource and habitat use respond to changes in resource availability and accessibility for lake trout (Salvelinus namaycush) across Ontario. These results ultimately reveal how these aquatic ecosystems respond to environmental variation and alter the flow of carbon through the ecosystem. Chapter 2 explores how changes in resource use as an individual grows influence the relationship between body size and population density. The commonly seen relationship between mean body-size and density at the global scale often breaks down as the scale of observation decreases, and we suggest that this is due to the increased importance of variation in body size. Using data on lake trout body-size and density across communities, we ask if variation in body-size influences population density. Lastly, Chapter 3 explores how ontogenetic changes in resource use may distribute energy in a way that stabilizes communities with life-history intra-guild predation. There are three main conclusions in this thesis. First, by using a behavioural approach to measure habitat use, we find support for a behavioural mechanism for how lake trout respond to changes in resource availability and accessibility (Chapter 1). Second, variability in body size mediated by the available resource spectrum may cause the break-down of the broad scale body size - density relationship at the population level (Chapter 2). Finally, maturation and reproduction can redistribute energy away from strong interactions to weak interactions in populations with ontogenetic diet shifts, in turn stabilizing the community (Chapter 3).
Book Synopsis Spawning Habitat and Reproductive Strategies of Lake Trout (Salvelinus Namaycush) in a Northern Boreal Lake by : David Callaghan
Download or read book Spawning Habitat and Reproductive Strategies of Lake Trout (Salvelinus Namaycush) in a Northern Boreal Lake written by David Callaghan and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selected Water Resources Abstracts by :
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1988 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Trophic Ecology of Lake Trout (Salvelinus Namaycush) in Flaming Gorge Reservoir Utah-Wyoming by : Thomas C. Roberts
Download or read book Trophic Ecology of Lake Trout (Salvelinus Namaycush) in Flaming Gorge Reservoir Utah-Wyoming written by Thomas C. Roberts and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lake Trout (Salvelinus namaycush) are apex predators that were first introduced into Flaming Gorge Reservoir, Utah-Wyoming in 1979 and have been self-sustaining since 1989. However, our understanding of their trophic ecology and subsequent effects on other fish species within this reservoir is limited. I assessed feeding dynamics of Lake Trout through traditional diet analyses and stable isotope analyses of muscle and liver tissues, and compare these outputs to patterns of Lake Trout growth rates and size structure. By integrating Lake Trout feeding dynamics with population demographics, I infer potential impacts of Lake Trout predation on prey fish. Lake Trout consumed a wide breadth of prey items across their ontogeny, but consumed a higher proportion of fish as their length increased. Stable isotope analyses suggested a higher reliance on fish prey than was described by stomach content analysis; however, estimates of feeding dynamics were comparable across methods. Growth models suggest that Lake Trout exhibited two distinct growth trajectories which indicate a divergent foraging strategy among individuals. I conclude that Lake Trout predation could be an important driver of game and non-game fish populations. While more information is needed, results suggest current length class definitions used for Lake Trout harvest regulations may not reflect observed ecological breakpoints. Further research such as bioenergetics modeling and fishing related mortality estimates are needed to fully understand ecological dynamics of this apex predator within Flaming Gorge Reservoir.
