Using Landscape-scale Habitat Models to Predict Potential Abundance of Potamodromous Fishes Above Dams on Great Lakes Tributaris PDF Download
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Author: Sara M. Creque
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 145
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Author: Sara M. Creque
Publisher:
ISBN:
Category : Fish populations
Languages : en
Pages : 145
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Book Description
Author: T. Edsall
Publisher: Aquatic Ecosystem Health & Mgmt Soc
ISBN:
Category : Science
Languages : en
Pages : 668
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Book Description
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.
Author: Jeremy Joseph Pritt
Publisher:
ISBN:
Category : Ecosystem management
Languages : en
Pages : 197
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Book Description
Migratory fish are globally harvested by humans and are important to ecosystem function. The management of migratory fish depends on an ability to monitor populations and a sound understanding of the role of fish migrations in an ecosystem context. Lake Erie is a highly productive freshwater fishery and many of Lake Erie's fishes are potamodromous, migrating from Lake Erie into tributaries to spawn. The goal of this dissertation was to improve methods for monitoring migratory fishes and examine the role of fish migrations in ecosystem processes. First, I developed techniques for monitoring spawning stocks of migratory fishes in the Maumee River, one of Lake Erie's largest tributaries, using hydroacoustic sampling, gill net sampling, and Bayesian state-space modeling. I determined that the spawning stock abundance for Walleye was approximately 650,000 fish in 2011 and 550,000 individuals in 2012. Second, I examined the importance of fish migrations as a material subsidy to upstream riverine consumers using stable isotope analysis. I found that although migratory fish inputs (eggs and carcasses) were a negligible pool of carbon relative to other sources. However, migratory fish biomass had low carbon to nitrogen ratios, indicating high nutritional quality, and stable isotope analysis supported the hypothesis that some riverine fishes and invertebrates consume these inputs. Third, I estimated detection probabilities for larval fishes in the Maumee and Detroit rivers and demonstrated how detection information can be used to inform indices of abundance and taxonomic richness estimates. Detection probabilities varied among taxa and were generally greater in the Maumee River than the Detroit River. Taxa with the greatest detection probabilities were those with high fecundities, small hatching lengths, and no nesting behaviors. Accounting for incomplete detection greatly increased an index of abundance for a species with low detection probability but had a relatively minor influence on a species with high detection probability. Fourth, I conducted a literature review to synthesize habitat use of larval fishes in the Great Lakes. Habitat use varied among species, with some preferring nearshore, shallow habitats and others preferring offshore, deep habitats. From this information, I created three habitat groups: Lotic, Lentic Nearshore, and Lentic Offshore. Life history traits partially explained species' membership into the three habitat groups and may be useful for predicting the response of larval fishes to habitat restoration and possible habitat use of future invasive species. My study provides methodological advances for the monitoring of adults and larvae of migratory. I also showed that migratory fish are used as a food source by some resident fishes in lower reaches of Lake Erie tributaries; however, I hypothesize that the importance of migratory fish to upstream ecosystems has been diminished by anthropogenic disturbances. Thus, ecosystem-based management efforts should therefore consider the potential importance of migratory fish as ecosystem linkages.
![Spatial and Temporal Assessment of Fish Habitat and Environmental-nearshore Fish Community Relationships in the Eastern Lake Erie Basin [microform] PDF](https://books.google.com/books/content/images/frontcover/3lYvtAEACAAJ?fife=w80-h100)
Author: Sapna Sharma
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612915800
Category :
Languages : en
Pages : 364
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Environmental conditions were used to determine relationships with the nearshore fish assemblage of the eastern basin and to model habitat for different life stages of walleye in the eastern Lake Erie basin adjacent to the outflow of the Grand River. Optimal walleye habitat tended to be found along the shoreline of the lake and dependent on the Grand River plume. Generally, there was very little optimal walleye habitat found in the lower reaches of the Grand River. The nearshore fish assemblage tended to be size-structured and related to specific environmental conditions, such as conductivity, temperature, dissolved organic carbon, chloride concentrations, alkalinity, sampling date and abundances of emergent and submergent plants. Improvements in both biotic and abiotic features of habitat in the nearshore and tributaries will enhance the amount of habitat optimal for specific fish species, and thereby the potential abundance of these fish species.
Author: Canada. Department of Fisheries and Oceans
Publisher: Burlington, Ont. : Fisheries and Oceans Canada
ISBN:
Category :
Languages : en
Pages : 30
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Author:
Publisher:
ISBN: 9781934874561
Category :
Languages : en
Pages :
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Author: Food and Agriculture Organization of the United Nations
Publisher: Food & Agriculture Org.
ISBN: 9789251046944
Category : Business & Economics
Languages : en
Pages : 180
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Book Description
The importance of free longitudinal passage of river fauna is stressed.
Author: Bror Jonsson
Publisher: Springer Science & Business Media
ISBN: 9400711891
Category : Science
Languages : en
Pages : 720
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Book Description
Destruction of habitat is the major cause for loss of biodiversity including variation in life history and habitat ecology. Each species and population adapts to its environment, adaptations visible in morphology, ecology, behaviour, physiology and genetics. Here, the authors present the population ecology of Atlantic salmon and brown trout and how it is influenced by the environment in terms of growth, migration, spawning and recruitment. Salmonids appeared as freshwater fish some 50 million years ago. Atlantic salmon and brown trout evolved in the Atlantic basin, Atlantic salmon in North America and Europe, brown trout in Europe, Northern Africa and Western Asia. The species live in small streams as well as large rivers, lakes, estuaries, coastal seas and oceans, with brown trout better adapted to small streams and less well adapted to feeding in the ocean than Atlantic salmon. Smolt and adult sizes and longevity are constrained by habitat conditions of populations spawning in small streams. Feeding, wintering and spawning opportunities influence migratory versus resident lifestyles, while the growth rate influences egg size and number, age at maturity, reproductive success and longevity. Further, early experiences influence later performance. For instance, juvenile behaviour influences adult homing, competition for spawning habitat, partner finding and predator avoidance. The abundance of wild Atlantic salmon populations has declined in recent years; climate change and escaped farmed salmon are major threats. The climate influences through changes in temperature and flow, while escaped farmed salmon do so through ecological competition, interbreeding and the spreading of contagious diseases. The authors pinpoint essential problems and offer suggestions as to how they can be reduced. In this context, population enhancement, habitat restoration and management are also discussed. The text closes with a presentation of what the authors view as major scientific challenges in ecological research on these species.
Author: Ellen Wohl
Publisher: Oxford University Press, USA
ISBN: 0190943521
Category : Nature
Languages : en
Pages : 209
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Book Description
The ability of beavers to create an abundant habitat for a diverse array of plants and animals has been analyzed time and again. The disappearance of beavers across the northern hemisphere, and what this effects, has yet to be comprehensively studied. Saving the Dammed analyzes the beneficial role of beavers and their dams in the ecosystem of a river, focusing on one beaver meadow in Colorado. In her latest book, Ellen Wohl contextualizes North St. Vrain Creek by discussing the implications of the loss of beavers across much larger areas. Saving the Dammed raises awareness of rivers as ecosystems and the role beavers play in sustaining the ecosystem surrounding rivers by exploring the macrocosm of global river alteration, wetland loss, and the reduction in ecosystem services. The resulting reduction in ecosystem services span things such as flood control, habitat abundance and biodiversity, and nitrate reduction. Allowing readers to follow her as she crawls through seemingly impenetrable spaces with slow and arduous movements, Wohl provides a detailed narrative of beaver meadows. Saving the Dammed takes readers through twelve months at a beaver meadow in Colorado's Rocky Mountain National Park, exploring how beavers change river valleys and how the decline in beaver populations has altered river ecosystems. As Wohl analyzes and discusses the role beavers play in the ecosystem of a river, readers get to follow her through tight, seemingly impenetrable, crawl spaces as she uncovers the benefit of dams.
Author: Jeffrey J. Duda
Publisher:
ISBN:
Category : Coastal ecology
Languages : en
Pages : 276
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Book Description
