Download or read book Climate Change Effects on Lake Erie Yellow Perch Reproduction and Recruitment written by Troy Mason Farmer and published by . This book was released on 2013 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Download or read book The Effects of Life History Parameters on the Reproductive Potential of Yellow Perch Perca Flavescens Populations written by Tanya Vinodrai Trivedi and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Responses of an Exploited Fish Population to Environmental Change written by David Arthur Dippold and published by . This book was released on 2020 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Lower Trophic Level and Climate Influences on Western Lake Erie Fish Recruitment 1988 2005 written by Valerie C. Crane and published by . This book was released on 2007 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The recruitment of yellow perch and walleye in the western basin of Lake Erie is highly variable, both spatially and from year-to-year. For this reason, we examined the impact of weather and lower trophic level factors on the year--class formation of these species for the period from 1988 to 2005. We hypothesized that the temporal and spatial match/mismatch of the age-0 fish with their zooplankton prey would influence year-class strength (YCS). We split our YCS and plankton data into four western basin habitat areas (island area, west of island area, Maumee Bay, and the Sandusky subbasin) and used multiple regression analysis with Akaike's information criterion for model selection to identify the most important factors influencing recruitment. We found that the relative influence of lower trophic level factors differed by area, with zooplankton variables being more important in the less productive areas. Weather factors, however, were important in all areas. Previous winter temperature was found to be very important in shaping the year-classes of both of these percids. Of the lower trophic level variables, the date of the midseason crustacean zooplankton decline and May copepod productivity (u/L/day) were the most important factors in yellow perch recruitment, while May cladoceran productivity and May percent Daphnia were most important in walleye recruitment. We also found that there was often a switch from a positive relationship with zooplankton productivity in May to a negative relationship in June, suggesting that YCS is set early and large numbers of YOY fish can exert top-down control over the zooplankton community, depressing productivity early in the season. Our results show that even within the same system, spatial differences in habitat can lead to different recruitment mechanisms. Because little is known about the recruitment of forage fish in Lake Erie, we also attempted to identify factors that are influential to the recruitment of several forage species (white bass, white perch, freshwater drum, emerald and spottail shiners, gizzard shad, trout perch, and rainbow smelt). We constructed regression models for the whole western basin and attempted to identify factors that influence recruitment on a basin-wide scale rather than identifying spatial differences as we did for yellow perch and walleye. All variables were, however, averaged by area to account for area-specific differences in our models. We found that forage fish recruitment, while less variable than yellow perch and walleye recruitment, did show large amounts of interannual variation. In addition, some species such as white perch showed trends in recruitment, with YCS decreasing and then leveling off over our time series. As with yellow perch and walleye, lower trophic level and weather factors were important to the recruitment of forage fish. For example, early season zooplankton productivity and wind speed and direction were important to several forage species. However, we found that while previous winter air temperature influenced yellow perch and walleye recruitment, spring and summer air temperatures were more influential in the recruitment of forage species. We also found that adult population size was positively related to white perch recruitment and predation by age-O walleyes was negatively related to shiner recruitment. We uncovered several similarities and differences in the recruitment mechanisms of forage species and some species exhibited year-to-year recruitment synchrony, which we attributed to similarities in habitat use. However, these similarities were not always captured in our models and we suggest that more research on forage fish recruitment is necessary in the Great Lakes.

Download or read book Modeling the Effects of Turbidity on Age 0 Yellow Perch Perca Flavescens in the Western Basin of Lake Erie written by Nathan F. Manning and published by . This book was released on 2013 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book The Population Dynamics and Reproductive Tactics of Yellow Perch Perca Flavescens and White Perch Morone Americana in Western Lake Erie written by George Matthew Bence Norton and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Impacts of climate change on fisheries and aquaculture written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2019-01-06 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report indicates that climate change will significantly affect the availability and trade of fish products, especially for those countries most dependent on the sector, and calls for effective adaptation and mitigation actions encompassing food production.

Download or read book Yellow Perch Walleye and Sauger Aspects of Ecology Management and Culture written by John Clay Bruner and published by Springer Nature. This book was released on 2021-11-21 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Walleye, one of the most sought-after species of freshwater sport fishes in North America, has demonstrated appreciable declines in their numbers from their original populations since the beginning of the 20th century. Similarly, Yellow Perch, once the most commonly caught sport fish and an important commercial species in North America, have also shown declines. Compiling up-to-date information on the biology and management of Walleye, Sauger, and Yellow Perch, including research on systematics, genetics, physiology, ecology, movement, population dynamics, culture, recent case histories, and management practices, will be of interest to managers, researchers, and students who deal with these important species, particularly in light of habitat alterations, population shifts, and other biotic and abiotic factors related to a changing climate.

Download or read book Zooplankton of the Great Lakes written by Mary D. Balcer and published by Univ of Wisconsin Press. This book was released on 1984 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers, instructors, and students will appreciate this compilation of detailed information on the crustacean zooplankton of the Great Lakes. The authors have gathered data from more than three hundred sources and organized into a useful laboratory manual. The taxonomic keys are easy to use, suitable for both classroom and laboratory identifications. Detailed line drawings are provided to help confirm the identification of the major species. Zoologists, limnologists, hydrobiologists, fish ecologists, and those who study or monitor water quality will welcome this dependable new identification tool. A concise summary of pertinent information on the ecology of these zooplankton is provided in the main body of the text. A check-list of all species reported from each of the Great Lakes and notes on the distribution and abundance of more than a hundred species were compiled from an extensive search of existing literature. In addition, the authors collected samples from several locations on Lake Superior, in order to provide information on the abundance and life histories of the major crustacean species.

Download or read book The Potential Effects of Global Climate Change on the United States written by and published by . This book was released on 1989 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Assessing the Potential for Differential Contributions of Spawning Stocks to Lake Erie Yellow Perch Populations written by Paris Dever Collingsworth and published by . This book was released on 2009 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: From an ecological perspective, this research was an attempt to identify factors that may influence annual population fluctuations in yellow perch. From an applied, management perspective, we were attempted to identify recruitment mechanisms that can be manipulated to better manage yellow perch in Lake Erie. Fish recruitment is a process driven by the complex interactions of many abiotic and biotic factors and many of these factors, such as environmental conditions, are uncontrollable. The identification of recruitment mechanisms that can be affected via management initiatives would be invaluable to managers and greatly advance our ability to manage fish populations.

Download or read book State of Lake Michigan written by T. Edsall and published by Aquatic Ecosystem Health & Mgmt Soc. This book was released on 2005 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume, cataloging and analyzing the current science on the state of Lake Michigan, is an important part of Great Lakes recovering science. It carries forward the singular contribution that the binational Great Lakes scientific community has made not only to restoring the Great Lakes but also to the world's body of knowledge about large lake ecology, the long-range transport of pollutants, and the importance of habitat in ensuring ecosystem health.

Download or read book EcoLE FisH YP written by Jonathan Douglas Horn and published by . This book was released on 2010 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book River Plume Effects on Yellow Perch Growth Survival and Recruitment in Lake Erie written by Julie Marie Reichert and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Understanding Maternal Effects as a Recruitment Mechanism in Lake Michigan Yellow Perch Perca Flavescens written by Christopher James Heyer and published by . This book was released on 2000 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Maternal Effects as a Recruitment Mechanism in Lake Michigan Yellow Perch Perca Flavescens written by Christopher J. Heyer and published by . This book was released on 2001 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Climate Change and Coastal Ecosystems written by Robert J. Livingston and published by CRC Press. This book was released on 2014-11-03 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: Produced by a Leading Aquatic ScientistA narrative account of how estuaries around the world are being altered by human forces and human-induced global climate changes, Climate Change and Coastal Ecosystems: Long-Term Effects of Climate and Nutrient Loading on Trophic Organization chronicles a more than 40-year-old research effort conducted by Dr.