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Variation In The Growth And Bioenergetics Of Ontarios Walleye Sander Vitreus Populations Microform Studying The Influence Of Prey Abundance And Size
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Author :Jacob Keith Leslie La Rose Publisher :Library and Archives Canada = Bibliothèque et Archives Canada ISBN 13 :9780612956094 Total Pages :194 pages Book Rating :4.9/5 (56 download)
Book Synopsis Variation in the Growth and Bioenergetics of Ontario's Walleye (Sander Vitreus) Populations [microform] : Studying the Influence of Prey Abundance and Size by : Jacob Keith Leslie La Rose
Download or read book Variation in the Growth and Bioenergetics of Ontario's Walleye (Sander Vitreus) Populations [microform] : Studying the Influence of Prey Abundance and Size written by Jacob Keith Leslie La Rose and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2004 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: Walleye exhibit moderate among-population variation in life history across Ontario. Recent studies have explained this variation using easily measured abiotic environmental variables. I broadly examined the effects of prey abundance and size on walleye growth potential and energy budgets using a new biphasic growth model and a linked mercury mass balance and fish bioenergetics model respectively. Among lake variation in prey abundance, though statistically significant in a subset of lakes (remaining lakes when a group of outliers with unusually low growth were removed), was not a strong predictor of variation in walleye growth potential. I detected no systematic variations in walleye growth efficiency as a function of available prey sizes. Consequently, these measures of prey size and abundance do not represent practical easily measured environmental correlates of walleye growth. A potential reason is large inter-annual variability in the prey abundance and size variables.
Author :Zhao, Yingming Publisher :Library and Archives Canada = Bibliothèque et Archives Canada ISBN 13 :9780494078679 Total Pages :394 pages Book Rating :4.0/5 (786 download)
Book Synopsis Climate and Dynamics of Walleye (Sander Vitreus, Formerly Stizostedion Vitreum Vitreum) Populations in North America [microform] by : Zhao, Yingming
Download or read book Climate and Dynamics of Walleye (Sander Vitreus, Formerly Stizostedion Vitreum Vitreum) Populations in North America [microform] written by Zhao, Yingming and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2005 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climatic conditions significantly influenced growth of walleye in North America. Genetically distinct walleye populations appear to have developed their own adaptation strategies to respond to their regional climatic conditions. Walleye early growth rate showed a significant latitudinal trend: the populations at low latitudes, experiencing high thermal input, had a high early growth rate (o) and a high value for k, the rate of approaching asymptotic length (Linfinity) as defined in the von Bertalanffy growth model. However, the impact of climatic conditions on walleye growth in later life, as characterized by L infinity was not significant. In Lake Erie, three walleye sub-populations (i.e. the western basin, Van Buren Bay, and Grand River) showed distinct demographic characteristics. The western basin walleye had a lower early growth rate than the eastern basin walleye. The differences in early growth rate among these walleye subpopulations were associated with the differences in thermal regimes experienced by each sub-population during the growing season. The overheated western basin provided the worst growth habitat for walleye during summer/fall. Younger fish cannot avoid these overheated conditions and thus may be exhibiting reduced growth rates because of the unsuitable growth habitat in the western basin. The survival rates of adult walleye in the eastern basin were higher than the lakewide average, but the abundance was less than one percent of the lakewide adult walleye abundance. The warmer and clearer water conditions in 1998 created more walleye habitat than in 1993. The increases in water temperature and decreases in water level that may result from climate change will have different impacts on the habitat suitable for walleye among the three basins, with the greatest effect in the western basin. A simulation study showed that density-dependent early survival and density-dependent adult growth and egg production significantly affect the dynamics of the walleye metapopulation in Lake Erie. Walleye early survival (i.e. recruitment) could be a bottleneck, setting the overall sizes of the western basin and eastern basin sub-populations. This bottleneck would be sensitive to the changes in habitat expected from climate change.
Book Synopsis Evaluation of the Intraspecific Effects of a 15-inch Minimum Size Limit on Walleye (Sander Vitreus) Populations in Northern Wisconsin by : Michelle Lee LeBeau
Download or read book Evaluation of the Intraspecific Effects of a 15-inch Minimum Size Limit on Walleye (Sander Vitreus) Populations in Northern Wisconsin written by Michelle Lee LeBeau and published by . This book was released on 2004 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Behavioral Ecology of Walleye (Sander Vitreus) by : Andrew Peter Bade
Download or read book The Behavioral Ecology of Walleye (Sander Vitreus) written by Andrew Peter Bade and published by . This book was released on 2021 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many migratory animals time reproduction using environmental cues (e.g., photoperiod) that signal favorable conditions for offspring (e.g., food availability). However, environmental change can decouple these cues from the conditions relevant to offspring success. In turn, variation in reproductive behaviors may be critical to population persistence in a changing environment. For example, while natal homing can lead to valuable local adaptations in a stable environment, straying to new breeding sites can buffer against environmental change. Among exploited species, knowledge of reproductive behavior, such as spawn timing (phenology) and spawning site selection, has proven useful to fisheries management by influencing angling dynamics, estimates of biological reference points, and stock delineations. Thus, a well-developed understanding of reproductive phenology, breeding site selection, and fishery dynamics could help agencies effectively conserve and manage fisheries in ecosystems experiencing environmental change. Accordingly, my dissertation research sought to better understand the reproductive behaviors and angling dynamics of Lake Erie’s walleye population. In collaboration with other researchers and agency biologists, I used acoustic telemetry, creel surveys, environmental monitoring data, and quantitative techniques to discern the spawning behaviors and angling dynamics of this population. We assessed the timing of residency in spawning sites, focusing on how environmental cues and individual characteristics drive observed variation (Chapter 2), developed a quantitative framework to estimate the frequencies of each potential spawning site selection strategy (Chapter 3), demonstrated sex based-differences in spawning behavior and male-biased walleye harvest during the spawning season (Chapter 4), and modeled the impact of fishery characteristics and angler behaviors on recreational catch outcomes (Chapter 5). Each chapter generated new insights to the benefit of fisheries management through advances in our understanding of reproductive ecology and angling dynamics. In Chapter 2, we found that the timing of residency in spawning sites differed between sexes and among spawning locations and was controlled by photoperiod and temperature. The varying responses to warming suggest that reproductive resilience is promoted by conserving local spawning populations and a broad age structure. The findings from Chapter 3 demonstrated that, although spawning site fidelity and annual spawning are common, apparent skipped spawning also occurs (~ 14% of observations). Accounting for this potential skipped spawning led to revised biological reference points, owing to adjusted estimates of spawning stock biomass. Additionally, although few walleye strayed, the pattern of straying indicated that some stocks mix heavily. In Chapter 4, we found strong evidence for sex-specific spawning behaviors, with males occupying spawning grounds longer than females, which helped explain male-biased walleye harvest on the spawning grounds. Lastly, in Chapter 5, modeling creel survey data showed that angler decisions influenced catch outcomes more than abundance of the targeted walleye population. The findings from this chapter can help anglers maximize their probability of fishing success, given desired catch outcomes. The improved understanding of Lake Erie walleye reproductive behavior, angling dynamics, and the relationships between them, should help agencies worldwide keep their valued fish populations sustainable in the face of continued environmental change.
Book Synopsis Legacies of Early-life Experiences on Individual, Cohort, and Population Performance of Lake Erie Walleye by : Leah Zoe Almeida
Download or read book Legacies of Early-life Experiences on Individual, Cohort, and Population Performance of Lake Erie Walleye written by Leah Zoe Almeida and published by . This book was released on 2021 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: The experiences an individual has during early development may have life-long effects (“experiential legacies”) which can also have population-level consequences. However, since experiential legacies are difficult to measure in populations, how experiential legacies of individuals affect cohort- and population-level outcomes (i.e., buffering or amplifying population responses) remains difficult to discern. The objective of my dissertation research is to evaluate the extent to which experiential legacies affect individual performance and alter population dynamics. By exploring the importance of individual life events to populations, we can better understand the interconnectedness of life stages and better anticipate how environmental change may alter population and community dynamics. Specifically, I examined individual experiential legacies across a range of animal species with the goal of identifying generalizable patterns in response to early-life nutritional stress (Chapter 2), and then I focused on experiential legacies within individuals (Chapter 3), cohorts of individuals (Chapter 4), and a population consisting of multiple cohorts (Chapter 5) in Lake Erie Walleye (Sander vitreus). Lake Erie Walleye present a population for which understanding the long-term impacts of early-life experiences may be particularly valuable due to current human-induced environmental changes within its ecosystem. Since experiential legacies can produce unanticipated changes in the kinds as well as proportions of subsequent (i.e., later in life) phenotypes, examining patterns across multiple species may expose underlying trends. Patterns in experiential legacies across 81 studies of 65 animal species demonstrated generally consistent negative or neutral impacts of early nutritional stress on later-life phenotypes, indicative of energy depletion as a mechanism for the long-term consequences of early-life conditions (Chapter 2). Yet, overall, my results emphasize the existence of complicated interactions among a suite of phenotypic responses in determining individual performance. Within Lake Erie Walleye, I found evidence of experiential legacies from early-life experiences using laboratory experiments, but I also observed indications of the strong influence of maternal legacies and of carryover effects from more recent experiences using long-term data on cohorts. Nutritional quality of food during early life (a 10-d period starting when Walleye could first feed) was positively correlated with Walleye juvenile sizes and this correlation with size continued even after all treatments were fed on a high-quality standardized diet for an additional 27-d (Chapter 3). Beyond the period examined in my laboratory experiments, though, in an analysis of field data, I found that maternal effects were more influential than sizes or densities achieved during the first few months of life to annual growth in Walleye cohorts at ages 3-5 (Chapter 4). Thus, early-life experiences can produce experiential legacies in Lake Erie Walleye, but those experiences may be overwhelmed by the lingering influence of other factors such as maternal effects. Additionally, at the cohort-level, growth in the previous year negatively affected recent growth at ages 3-5, which may be indicative of compensatory growth in Walleye and could reduce variation among cohorts in size-at-age over a longer period of time. At the population-level, I modeled how specific experiential legacies may be more or less beneficial under different environmental conditions for Lake Erie Walleye, which demonstrates characteristics of a periodic life history (i.e., high fecundity, low early-life survival, old age at maturity), as well as for populations representing equilibrium (low fecundity, low early-life survival, old age at maturity) and opportunistic (high fecundity, low early-life survival, young age at maturity) life histories (Chapter 5). Across experiential legacies and these three life history strategies, early-life environments were primarily responsible for differences in simulated population growth rates and demography, with more frequent “good” early-life environments increasing population growth rates, increasing variation in population growth rates, and decreasing the proportion of older ages in the populations. However, when early-life environments were likely to be good and later-life environments were likely to be poor, experiential legacies that create lifetime trajectories (i.e., early-life conditions establish phenotypes that persist throughout life) were beneficial to population growth for all life histories. While other modeled experiential legacies did not demonstrate any specific benefit to Walleye, experiential legacies that create environmental specialization (i.e., later-life phenotypes perform best when early-life and later-life environments are similar) and later stressor resilience (i.e., poor early-life environments allow later-life phenotypes to perform well in poor environments) were beneficial for the equilibrium population when early-life environments were frequently poor, potentially due to the importance of adult survival for the equilibrium population. Overall, these simulations indicated that variation in experiential legacies across populations could be due to combinations of life history characteristics and frequencies of specific environmental conditions in early and later life. My results at the individual, cohort, and population level demonstrate how exploring experiential legacies can provide a deeper understanding of population patterns. Across species, experiential legacies may be related to how energy is allocated in early life (Chapter 2). Within Lake Erie Walleye, I observed that early-life nutritional conditions continued to affect juvenile Walleye sizes after nutritional conditions became standardized, supporting the idea of early-life energy allocation driving later performance (Chapter 3). Despite these results in young Walleye, the early-life growth environment did not appear to be the most important factor driving later cohort-based Walleye growth, potentially due to compensatory growth maintaining stable size-at-age and maternal provisioning legacies (Chapter 4). Regardless of the experiential legacy that Lake Erie Walleye or other species experience, the early-life environment appears to be extremely influential in driving population growth; however, certain experiential legacies may be more common in specific environmental scenarios for species with specific life histories due to the potential advantages those experiential legacies provide (Chapter 5). While many questions remain, my research has improved our understanding of patterns and implications of experiential legacies in general, as well as the degree to which legacies of early life influence the response of Lake Erie Walleye to its environment.
Book Synopsis Life History Variation in Ontario Walleye Populations by : Nigel Paul Lester
Download or read book Life History Variation in Ontario Walleye Populations written by Nigel Paul Lester and published by . This book was released on 2000 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synchronous Recruitment of Walleye in the Great Lakes and the Influence of Climate on Recruitment by : Samantha Lee Fedor
Download or read book Synchronous Recruitment of Walleye in the Great Lakes and the Influence of Climate on Recruitment written by Samantha Lee Fedor and published by . This book was released on 2008 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Current concerns about the repercussions of global climate change have stimulated efforts to understand how changing abiotic conditions influence natural populations. Walleye (Sander vitreus) populations have shown marked annual variability that can not be predicted by the size of the spawning population. Previous research has associated this variability with environmental factors such as spring warming rate, river discharge, and storm frequency and intensity. Frequently, however, the predictability of models developed from these studies falters as new data points are added and previous relationships are weakened. Relationships between recruitment and abiotic variables may disintegrate because of the interaction between local and large-scale variables that may not be detected in short time series but become more apparent when many more years are added. By comparing multiple populations within a region, the effects of large-scale variables and local variables should be possible to distinguish, with years of covariation representing years in which climate (or other large-scale factors) is influencing recruitment. We examined the effects of climate on recruitment of walleye by comparing four populations of walleye in the Great Lakes (west basin, Lake Erie, Saginaw Bay, Lake Huron, Green Bay, Lake Michigan, and Bay of Quinte, Lake Ontario) for synchrony of recruitment. Synchrony in recruitment among populations was determined using Pearson's product moment coefficient, and both single site and multi site models were created to test a set of a priori hypotheses regarding various local and large-scale factors influencing recruitment. Synchrony of recruitment occurred between three sites: west basin, Lake Erie, Green Bay, Lake Michigan, and Bay of Quinte, Lake Ontario during 2000-2004. El Niño-Southen Oscillation and the North Atlantic Oscillation were the best predictors of recruitment during 2000-2004. These results suggest that in addition to local weather conditions, large-scale factors influence walleye recruitment in the Great Lakes, and were the dominant variables influencing recruitment during this time. Understanding whether future changes in climate will cause overall increases or decreases in recruitment may help managers choose between more conservative and more liberal management strategies.
Book Synopsis Walleye Out of the Frying Pan and Into the Fire by : Thomas Van Zuiden
Download or read book Walleye Out of the Frying Pan and Into the Fire written by Thomas Van Zuiden and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate change will impact freshwater fish communities in Ontario. Warmwater species are expanding their ranges northward while cool and coldwater species are expected to shift or decline under the current rates of warming. Our first objective was to examine how a warmwater predator, smallmouth bass (Micropterus dolomieu) and a coolwater predator, walleye (Sander vitreus), will respond to climate change. Our second objective was to determine if smallmouth bass expansions negatively influence Ontario walleye abundances. Data was provided by the Ontario Ministry of Natural Resources, Intergovernmental Panel on Climate Change, and Climatic Research Unit. We projected that smallmouth bass will undergo range expansions throughout Ontario while walleye will become extirpated in their southern ranges and shift into northern waters. We also observed that there were fewer walleye at the landscape scale when they share lakes with smallmouth bass. These findings underscore the importance of proactive fisheries management and curbing climate change.
Book Synopsis Intraspecific Variation of Walleye (Sander Vitreus) in Ontario, Canada and Lake Winnebago, WI by : Mark H. Schmitz
Download or read book Intraspecific Variation of Walleye (Sander Vitreus) in Ontario, Canada and Lake Winnebago, WI written by Mark H. Schmitz and published by . This book was released on 2011 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Muskellunge Management by : Kevin L. Kapuscinski
Download or read book Muskellunge Management written by Kevin L. Kapuscinski and published by . This book was released on 2017 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Habitat Suitability Index Models by : Lynn L. Rogers
Download or read book Habitat Suitability Index Models written by Lynn L. Rogers and published by . This book was released on 1987 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Esocid Stocking : an Annotated Bibliography and Literature Review by : S. J. (Steven James) Kerr
Download or read book Esocid Stocking : an Annotated Bibliography and Literature Review written by S. J. (Steven James) Kerr and published by [Peterborough] : Fisheries Section, Ontario Ministry of Natural Resources. This book was released on 2001 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fisheries Techniques by : Brian R. Murphy
Download or read book Fisheries Techniques written by Brian R. Murphy and published by . This book was released on 1996 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dioxin Perspectives by : Erich W. Bretthauer
Download or read book Dioxin Perspectives written by Erich W. Bretthauer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 785 pages. Available in PDF, EPUB and Kindle. Book excerpt: Erich W. Bretthauer, Chairman of the Exposure and Hazard Assessment Working Group U. s. Environmental Protection Agency Washington, D. C. The efforts of the Exposure and Hazard Assessment Working Group were focused on the exchange of information on a variety of topics including research projects, regulations/statutes, analytical laboratories, and methods of exposure/risk assessment involving CDDs and CDFs. It was evident to the leaders of the Working Group that several of the knowledge voids had to be addressed on a fundamental level before expanded efforts could be made. Several questions needed to be answered: • Who has done research on this topic, and what do the data indicate? • Who is performing research now, and what are their capabilities? • How are other nations addressing this problem, and do they have legislative mandates in place? • Is there a general consensus on the topic? The members of the Working Group believed that these questions could be answered by surveying the major participants in the field of interest. Three principal survey efforts were performed by the Working Group, which collected information on research, regulations/statutes, and analytical laboratories from each of the participating nations. In addition to answering these fundamental questions, these efforts also fulfilled the major objectives of the entire Pilot Study. The collection, analysis, and distribution of information on research projects, regulations/statutes, and analytical laboratories were very useful efforts in helping to fill some of the basic knowledge voids.
Download or read book EPA-600/2 written by and published by . This book was released on 1980 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Historical Review of Fish Culture, Stocking and Fish Transfers in Ontario, 1865-2004 by : S. J. Kerr
Download or read book An Historical Review of Fish Culture, Stocking and Fish Transfers in Ontario, 1865-2004 written by S. J. Kerr and published by . This book was released on 2006-01-01 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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