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Dynamics Of Individual Growth In A Recovering Population Of Lake Trout Salvelinus Namaycusi
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Book Synopsis Dynamics of Individual Growth in a Recovering Population of Lake Trout ('Salvelinus Namaycusi') by : Mary C. Fabrizio
Download or read book Dynamics of Individual Growth in a Recovering Population of Lake Trout ('Salvelinus Namaycusi') written by Mary C. Fabrizio and published by . This book was released on 2000 with total page 35 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.
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 2011-09 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Dynamics of the Recovery of Lake Trout (Salvelinus Namaycush) in U.S. Waters of Lake Superior by : Michael J. Hansen
Download or read book Dynamics of the Recovery of Lake Trout (Salvelinus Namaycush) in U.S. Waters of Lake Superior written by Michael J. Hansen and published by . This book was released on 1994 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Boreal Shield Watersheds by : John Gunn
Download or read book Boreal Shield Watersheds written by John Gunn and published by CRC Press. This book was released on 2003-08-27 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boreal Shield Watersheds: Lake Trout Ecosystems in a Changing Environment brings together the work of a renowned international group of scientists who specialize in aquatic science and environmental management. They explore the functioning of Boreal Shield ecosystems, focusing on the lake trout, the classic coldwater species of northern glaciated l
Book Synopsis Ecology, behaviour and conservation of the charrs, genus Salvelinus by : Pierre Magnan
Download or read book Ecology, behaviour and conservation of the charrs, genus Salvelinus written by Pierre Magnan and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Salvelinus species are one of the most thoroughly studied groups of fishes. Many reasons explain this intense interest in charr biology. Charrs have a Holarctic distribution encompassing many Asian, North American, and European countries and occupy diverse marine and freshwater environments. Furthermore, the current distribution of charr includes areas that were directly influenced by climate and topographic change associated with the many Pleistocene glaciations. Undoubtedly, these conditions have promoted much of the tremendous morphological, ecological, and genetic variability and plasticity within Salvelinus species and they make charr very good models to study evolutionary processes 'in action'. Many charr species also exhibit demographic characteristics such as slow growth, late maturity, and life in extreme environments, that may increase their susceptibility to extinction from habitat changes and overexploitation, especially in depauperate aquatic habitats. This vulnerability makes understanding their biology of great relevance to biodiversity and conservation. Finally, charr are of great cultural, commercial, and recreational significance to many communities, and their intimate linkage with human societies has stimulated much interest in this enigmatic genus. This volume comprises a selection of papers presented at the fourth International Charr Symposium held in Trois-Rivières (Québec, Canada), from 26 June to 1 July 2000. It includes 31 papers on ecological interactions and behaviour, trophic polymorphism, movement and migration, ecophysiology and evolutionary genetics, ecological parasitology, environmental stress and conservation. These studies cannot cover all recent developments in the ecology, behaviour and conservation of Salvelinus species, but collecting them into a special volume should bring attention to current research on this important genus and stimulate further work on Salvelinus species.
Book Synopsis The Genomic Basis for Fitness and Ecomorphological Variation in Recovering Populations of Lake Trout (salvelinus Namaycush) in the Great Lakes by : Seth Robert Smith
Download or read book The Genomic Basis for Fitness and Ecomorphological Variation in Recovering Populations of Lake Trout (salvelinus Namaycush) in the Great Lakes written by Seth Robert Smith and published by . This book was released on 2021 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here I describe the development of novel genomic resources that will be fundamental for advancing a new generation of genomic research on Lake Trout (Salvelinus namaycush) including a high-density linkage map, an annotated chromosome-anchored genome assembly, and three high-throughput genotyping panels. We used these resources to identify genomic regions exhibiting signals of adaptive divergence between Lake Trout hatchery strains, some of which were found to underlie differences in fitness (survival and reproduction) between strains in the contemporary Lake Huron environment. Loci associated with differences in fitness between Seneca and Great Lakes origin strains were localized using local ancestry inference and local ancestry outlier tests. By evaluating locus specific allelic contributions of the ancestral Seneca Lake and Great Lakes-derived hatchery strains to naturally-produced wild Lake Huron populations across the genomes of F2 wild born individuals, we were able to determine that a subset of 7 genomic regions contributed to differences in fitness between Seneca Lake and Great Lakes origin individuals during the re-emergence of wild populations in Lake Huron. We also identified 2 genomic regions where Great Lakes origin alleles were favored by selection, 4 regions associated with hybrid vigor, and 2 regions potentially associated with hybrid inferiority in recovering wild Lake Trout populations. We also found that some Seneca origin alleles are only favored by selection on certain genetic backgrounds. For instance, F2 hybrids between the Seneca strain and Lake Michigan origin strains have an excess of Seneca origin haplotypes on chromosome Sna11, while this is not the case in hybrids between Lake Superior and Seneca origin individuals. Collectively, these results indicate that elevated performance of the Seneca strain can at least be partially attributed to a number of adaptive alleles at a small subset of genes. Additionally, the fact that Great Lakes origin alleles were favored by selection at two loci indicates that native strains contain some variation that provides a fitness advantage in Lake Huron. These admixture outlier regions contained a significant excess of genes related to swimming behavior and negative regulation of vascular wound healing, which strongly suggests that differences in fitness between strains are due to behavioral and physiological factors associated with the ability to avoid and survive predation by Sea Lamprey. Additionally, we carried out two studies seeking to identify genetic variation associated with habitat occupancy and phenotypic variation in Lake Trout. First, we carried out a quantitative trait locus (QTL) mapping study in which we identified loci associated with length and condition related traits, skin pigmentation, and body shape. We produced a linkage map for Lake Trout as a prerequisite for this work. The information on locus order obtained from the linkage map was also critical to the assembly of the Lake Trout genome and recombination rate estimates obtained from the linkage map were critical to the goal of assigning haplotype segments to their hatchery strain of origin for wild-born Lake Huron individuals. This study also allowed us to determine the location of the Lake Trout sex determination locus, determine centromere locations, and characterize structural differences (i.e., chromosomal inversions and translocations) between Lake Trout and other salmonid species. Second, we performed a genome-wide scan for loci associated with ecomorphological divergence in Lake Superior Lake Trout (specifically between lean, siscowet, and humper forms), and identified numerous regions with abnormally high levels of divergence between forms. These loci likely underlie variation in traits that differentiate forms, as well as traits that contributed to reproductive isolation historically. For example, the genomic region most strongly associated with length and condition (from our QTL mapping study) was also associated with ecomorphological divergence in Lake Superior and this region also contains a putative chromosomal inversion. Interestingly, we find that hybridization primarily occurred between humpers and siscowets and humpers and leans immediately preceding a genetic homogenization event that occurred in the late 1990s or early 2000s. Using a collection of samples over a multi-decade time series collected from the Apostle Islands, we show that levels of hybridization with humpers increased substantially starting in the 1980s.
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 Rapid Trophic Recovery of Lake Trout (Salvelinus Namaycush) in Response to Removal of an Introduced Predator by : Jesse Michael Lepak
Download or read book Rapid Trophic Recovery of Lake Trout (Salvelinus Namaycush) in Response to Removal of an Introduced Predator written by Jesse Michael Lepak and published by . This book was released on 2004 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wildlife Research written by and published by . This book was released on 2015 with total page 404 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.
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 Dynamics of Yellowstone Cutthroat Trout and Lake Trout in the Yellowstone Lake Ecosystem by : John Michael Syslo
Download or read book Dynamics of Yellowstone Cutthroat Trout and Lake Trout in the Yellowstone Lake Ecosystem written by John Michael Syslo and published by . This book was released on 2015 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The introduction of lake trout Salvelinus namaycush into Yellowstone Lake preceded the collapse of the native Yellowstone cutthroat trout Oncorhynchus clarkii bouvieri population. As a system with a simple fish assemblage and several long-term data sets, Yellowstone Lake provided a unique opportunity to evaluate the ecology of a native salmonid in the presence of a non-native salmonid population undergoing suppression in a large natural lake. Diet data for Yellowstone cutthroat trout and lake trout were evaluated at varying densities to determine the effects of density on diet composition. Temporal diet shifts from 1996-1999 to 2011-2013 were likely caused by limitation of prey fish for lake trout. Diets, stable isotopes, and depth-related patterns in CPUE indicated lake trout> 300 mm consumed primarily amphipods, making them trophically similar to Yellowstone cutthroat trout from during 2011-2013. A lake trout removal program was initiated during 1995 to reduce predation on Yellowstone cutthroat trout. Abundance and fishing mortality were estimated for lake trout from 1998 through 2013 and Yellowstone cutthroat trout from 1986 through 2013. Density-dependence was evaluated by examining individual growth, weight, maturity, and pre-recruit survival as a function of abundance. In addition, a simulation model was developed for the lake trout- Yellowstone cutthroat trout system to determine the probability of Yellowstone cutthroat trout abundance persisting at performance metrics given potential reductions in lake trout abundance. Estimates of Yellowstone cutthroat trout abundance varied 5-fold and lake trout abundance varied 6-fold. Yellowstone cutthroat trout weight and pre-recruit survival decreased with increasing Yellowstone cutthroat trout abundance; however, individual growth and maturity were not related to abundance. Lake trout population metrics did not vary with lake trout abundance. Simulation model results were variable because of uncertainty in lake trout pre-recruit survival. Conservative estimates for required lake trout reductions were> 97% of 2013 abundance for a> 70% probability of Yellowstone cutthroat trout persistence at the performance metrics outlined in the Native Fish Conservation Plan. Lake trout removal will likely reduce lake trout abundance and result in Yellowstone cutthroat trout recovery if the amount of fishing effort exerted in 2013 is maintained for at least 15 years.
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.
Download or read book Annales zoologici Fennici written by and published by . This book was released on 2003 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt:
