River Plume Effects on Yellow Perch Growth, Survival, and Recruitment in Lake Erie PDF Download
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Author: Julie Marie Reichert
Publisher:
ISBN: 9780494736357
Category :
Languages : en
Pages :
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Author: Julie Marie Reichert
Publisher:
ISBN: 9780494736357
Category :
Languages : en
Pages :
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Author: Lucia Beatriz Carreon Martinez
Publisher:
ISBN: 9780494782767
Category :
Languages : en
Pages :
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Author: Nathan F. Manning
Publisher:
ISBN:
Category : Algal blooms
Languages : en
Pages : 121
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Understanding the effects of turbidity on visually foraging fish species can be difficult due to the dynamic nature of sediment plumes and algal blooms in productive aquatic systems. In this dissertation, I examined the effects of turbidity type, timing and intensity on age-0 yellow perch (Perca flavescens). To accomplish this, I used ArcGIS and generalized additive models (GAMs), individual based models (IBMs) and the Soil and Water Assessment Tool (SWAT). The initial study utilized ArcGIS and GAMs to determine the relationship between turbidity and size and abundance in August of age-0 yellow perch. The GAMs presented in this dissertation show that water clarity (in this case used as a surrogate for turbidity) is an important environmental factor in determining the length and abundances of age-0 yellow perch in western Lake Erie. The results suggest that the influence of water clarity produces a distinct separation of areas of higher growth potential and areas of higher abundances in the western basin. While this division may be attributable to a number of mechanisms, including size dependent predation risk, foraging ability, and density dependent growth, the effects of water clarity, and in particular the negative effects of algal blooms, on foraging ability are of particular interest in Lake Erie. For the second step in this research I used laboratory derived feeding rates in a range of turbidity types and intensities to inform IBMs that varied the timing, type and intensity of turbidity to determine the effects of changes to a systems turbidity regime on growth and starvation mortality. The results of the model suggest that the timing and persistence of sediment plumes and algal blooms can drastically alter the growth potential and starvation mortality of a yellow perch cohort. The timing of sediment plumes in particular can have significant consequences to the growth, and ultimate success of a yellow perch population. High sediment turbidity early in the season, prior to the ontogenetic shift, can be potentially beneficial to fish growth. However, if high sediment turbidity conditions persist, they can slow growth and increase the starvation mortality of juvenile fish. In contrast, algal blooms, no matter when during the season they occur. In the final study, I used SWAT and IBM models to link watershed level changes in land use and climate to potential changes in age-0 yellow perch growth in the Maumee Bay, Lake Erie. Changes in land-use, either through increased urbanization, or changing agricultural practices, primarily affect fish growth through the alteration in the timing and intensity of sediment plumes. However, it may be that, at least in the Maumee River watershed, the negative effects have reach a plateau of sorts, with significant reductions in fish growth requiring changes to the watershed that are unlikely in the near future due to economic and infrastructure restrictions. Climate change, on the other hand, could potentially compound the effects of current land use practices through the promotion of algal blooms due to increased water temperatures, thus further reducing fish growth. The results of these three studies show that the effects of turbidty on age-0 yellow perch are dynamic, and can vary significantly depending on a number of different factors. The results of this research help to illuminate these complex interactions, and provide a warning about potential consequences due to anthropogenic alterations of an aquatic system's turbidity regime.
Author: Troy Mason Farmer
Publisher:
ISBN:
Category :
Languages : en
Pages : 181
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Abstract: Climate warming is expected to positively affect cool-water, temperate fish populations by lengthening the growing season and expanding thermal habitats suitable for positive growth. Yet, little is known about how a corresponding shortened winter might affect temperate fish populations, especially for species that require a prolonged period of cold temperature during the winter prior to spawning for proper ovary development. Additionally, events such as hypolimnetic hypoxia (O2
Author:
Publisher:
ISBN:
Category : Aquatic sciences
Languages : en
Pages : 738
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Author: David Arthur Dippold
Publisher:
ISBN:
Category : Climatic changes
Languages : en
Pages : 398
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The dynamics of fish populations are determined by demographic processes such as growth, survival, mortality, and movement that are influenced directly and indirectly by a suite of biotic and abiotic factors. Human-induced environmental change (e.g., climate change, nutrient pollution) is altering these processes, influencing the ability of ecosystems to support their resident populations, as well as the valuable ecosystem services they provide. The impacts of human-induced environmental change are often negative, can occur at a variety of spatial and temporal scales, and can vary with ontogeny. Therefore, understanding the historical and anticipated effects of environmental change on the dynamics of fish populations is critical to maintaining them, including the valued services and fisheries that they support. My research has sought to better understand the factors that influence population-level responses of exploited fish populations to changing environmental conditions, and to anticipate what these responses may look like amidst future change. To help achieve this research goal, my collaborators and I developed and applied numerous quantitative approaches to economically and ecologically important Lake Erie fish populations. Specifically, we forecasted the recruitment dynamics of several fish populations (walleye Sander vitreus, yellow perch Perca flavescens, and white perch Morone americana) under future climate change scenarios (Chapter 2), investigated historical changes in walleye recruitment dynamics in response to environmental factors (Chapter 3), anticipated how environmental change might alter early-life growth and survival of walleye via changes in larval stage duration (Chapter 4), and identified the role of demographic and environmental factors on the spatial patterning of walleye recreational harvest rates in Lake Erie (Chapter 5). These studies demonstrate that the dynamics of Lake Erie’s fish populations have changed in the past, and that environmental change is likely to continue to alter the dynamics of Lake Erie’s fish populations in the future. In Chapter 2, our modeling showed that walleye and yellow perch recruitment were forecasted to decline under future climate change, owing to shorter and warmer winters. For yellow perch, these declines were projected to be exacerbated by the implementation of agricultural conservation practices that reduce nutrient inputs into the west basin of Lake Erie. By contrast, recruitment of invasive white perch was projected to remain stable or increase relative to the past. In Chapter 3, my colleagues and I developed a modeling framework to build more informative environment-recruitment models. By applying this framework to the Lake Erie walleye population, we determined that the timing and importance of environmental factors previously associated with walleye recruitment (e.g., winter severity, spring warming rate, river discharge) have likely changed in the recent past. In Chapter 4, we linked output from a physical model to a bioenergetics model to show that walleye larval stage duration has likely changed in the recent past, with significant differences in direction and magnitude among Lake Erie’s three basins. Using historical environmental variability, we anticipated how future climate change might affect early-life growth and survival. Finally, in Chapter 5, my colleagues and I demonstrated that the relationships between temperature and walleye population size and recreational harvest rates vary spatially, and we anticipated how future ecosystem change could necessitate changes to the management of walleye in Lake Erie, owing to this spatial dependency. Collectively, the results of my research have helped to understand how Lake Erie’s fish populations respond to environmental change, to the benefit of fisheries management.
Author: Jonathan Douglas Horn
Publisher:
ISBN:
Category :
Languages : en
Pages : 96
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Ultimately, multiple mortality/survival influences work in concert to produce strong and poor year classes of yellow perch. Thus, a combination of environmental conditions that are conducive to survival at multiple life stages may provide the best opportunity for strong year classes of Lake Erie yellow perch.
Author:
Publisher: ScholarlyEditions
ISBN: 1464964955
Category : Science
Languages : en
Pages : 1175
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Book Description
Issues in Global Environment: Biodiversity, Resources, and Conservation: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Global Environment—Biodiversity, Resources, and Conservation. The editors have built Issues in Global Environment: Biodiversity, Resources, and Conservation: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Global Environment—Biodiversity, Resources, and Conservation in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Global Environment: Biodiversity, Resources, and Conservation: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Author: Tanya Vinodrai Trivedi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Yellow perch populations in Lake Erie exhibit large yearly fluctuations in year class strength (YCS), with most years showing relatively poor recruitment. For percids, no statistically significant relationship between stock and recruitment has been found. Most research has focussed on various environmental factors to explain the variability in YCS. Of the studies reviewed in the first chapter, variations in YCS could not be explained by variation in any single environmental factor. The second chapter revisited the theoretical equation that spawning stock size is related to recruitment. Yearly variation in the number of mature females in the spawning stock may explain the variability in the YCS of perch. We found that the proportion of fish at age varied annually from 1978-1990, suggesting that intermittent reproduction exists for Lake Erie yellow perch. The third chapter evaluated through a model whether variation in the proportion mature as well as interannual variations in age distributions, size and the associated size-related fecundity could explain the variability in YCS of the yellow perch populations. Variation in the proportion mature could explain a large proportion of the observed YCS, however we could not accurately predict recruitment from the variations in the life history parameters included in the model.
Author: Robert Scott Hayward
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 138
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