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Long-term Limnological Research and Monitoring at Crater Lake, Oregon

Long-term Limnological Research and Monitoring at Crater Lake, Oregon
Author: G.L. Larson
Publisher: Springer Science & Business Media
Total Pages: 280
Release: 2007-04-22
Genre: Science
ISBN: 1402058241

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This special volume represents the current state of knowledge of the status of Crater Lake, an ecosystem essentially undisturbed by human activities. The lake’s natural dynamics and processes have been studied, including its special optical properties, algal nutrient limitations, pelagic bacteria, and models of the inter-relationships of thermal properties, nutrients, phytoplankton, deep-water mixing, and water budgets.


Ecology of Kokanee Salmon and Rainbow Trout in Crater Lake, a Deep Ultraoligotrophic Caldera Lake (Oregon)

Ecology of Kokanee Salmon and Rainbow Trout in Crater Lake, a Deep Ultraoligotrophic Caldera Lake (Oregon)
Author: Mark W. Buktenica
Publisher:
Total Pages: 178
Release: 1988
Genre: Crater Lake National Park (Or.)
ISBN:

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Crater Lake, originally barren of fish, was stocked on an irregular basis from 1888 through 1941 with several species of salmonids. Two species occur in the lake today--kokanee salmon (Oncorhynchus nerka) and rainbow trout (Salmo gairdneri). This study was initiated in the summer of 1986 to evaluate the ecology of adult fish in terms of length, weight, age, growth, morphology, food habits, and distribution in Crater Lake relative to the lake's limnological characteristics. Fish were captured with gill nets, by angling, and with a modified downrigger. Age determinations from scale analysis, supported by modal progressions in length frequency histograms indicated that kokanee salmon age composition was heavily dominated, in number, by the 1984 year class. Spawning by members of this cohort was recorded in January 1988. Both species exhibited growth rates comparable to other northwest populations in oligotrophic lakes. Food resources were partitioned in that kokanee salmon generally fed on small-bodied taxa (mean weight 1.2 mg) from the midwater column and from the lake bottom, rainbow trout fed on large-bodied taxa (mean weight 9.8 mg) from the lake surface and the lake bottom. Distribution and diel migrations of fish were assessed with hydroacoustic techniques during the first week in September 1987. Fish underwent diel migrations within and between the nearshore (0 m to 100 m contour) and offshore (100 m to 589 m contour) zones of the lake. Based on capture records, it appeared that kokanee were primarily offshore and in deep water during the day, and then they moved shoreward into shallower water at night. Rainbow trout appeared to remain nearshore, in shallower water during the day than at night. The maximum depth for an acoustic target was 98.5 m. The maximum depth of capture for kokanee in Crater Lake was 86.25 m.


Crater Lake

Crater Lake
Author: American Association for the Advancement of Science. Pacific Division. Meeting
Publisher:
Total Pages: 234
Release: 1990
Genre: Science
ISBN:

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The Behavior, Ecology and Evolution of Cichlid Fishes

The Behavior, Ecology and Evolution of Cichlid Fishes
Author: Maria E. Abate
Publisher: Springer Nature
Total Pages: 832
Release: 2021-09-19
Genre: Science
ISBN: 9402420800

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This volume constitutes the most recent and most comprehensive consideration of the largest family of bony fishes, the Cichlidae. This book offers an integrated perspective of cichlid fishes ranging from conservation of threatened species to management of cichlids as invasive species themselves. Long-standing models of taxonomy and systematics are subjected to the most recent applications and interpretations of molecular evidence and multivariate analyses; and cichlid adaptive radiations at different scales are elucidated. The incredible diversity of endemic cichlid species in African lakes is revisited as possible examples of sympatric speciation and as serious cases for management in complex anthropogenic environments. Extreme hydrology and bathymetry as driver of micro-allopatric speciation is explored in the African riverine hotspot of diversity of the lower Congo River. Dramatic new molecular evidence draws attention to the complex taxonomy and systematics of Neotropical cichlids including the crater lakes of Central America. Molecular genetics, genomics, imaging tools and field study techniques assess the roles of natural, sexual and kin selection in shaping cichlid traits and beyond. The complex behavioral adaptations of cichlids are considered from a number of sub-disciplines including sensory biology, neurobiology, development, and evolutionary ecology. Most importantly, this volume puts forth a wealth of new interpretations, explanatory hypotheses and proposals for practical management and applications that will shape the future for these remarkable fishes in nature as well as their use as models for the study of biology.


Crater Lake National Park Research Opportunities

Crater Lake National Park Research Opportunities
Author: United States. National Park Service
Publisher:
Total Pages: 24
Release: 1999
Genre: Crater Lake National Park (Or.)
ISBN:

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Identifies research opportunities under the following topics: forest sciences, plant science and mycology, fish and wildlife sciences, ecology and ecosystem processes, earth sciences and volcanology, conservation biology, and social sciences.


Freshwater Fisheries Ecology

Freshwater Fisheries Ecology
Author: John F. Craig
Publisher: John Wiley & Sons
Total Pages: 920
Release: 2016-01-12
Genre: Technology & Engineering
ISBN: 1118394402

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Inland fisheries are vital for the livelihoods and food resources of humans worldwide but their importance is underestimated, probably because large numbers of small, local operators are involved. Freshwater Fisheries Ecology defines what we have globally, what we are going to lose and mitigate for, and what, given the right tools, we can save. To estimate potential production, the dynamics of freshwater ecosystems (rivers, lakes and estuaries) need to be understood. These dynamics are diverse, as are the earths freshwater fisheries resources (from boreal to tropical regions), and these influence how fisheries are both utilized and abused. Three main types of fisheries are illustrated within the book: artisanal, commercial and recreational, and the tools which have evolved for fisheries governance and management, including assessment methods, are described. The book also covers in detail fisheries development, providing information on improving fisheries through environmental and habitat evaluation, enhancement and rehabilitation, aquaculture, genetically modified fishes and sustainability. The book thoroughly reviews the negative impacts on fisheries including excessive harvesting, climate change, toxicology, impoundments, barriers and abstractions, non-native species and eutrophication. Finally, key areas of future research are outlined. Freshwater Fisheries Ecology is truly a landmark publication, containing contributions from over 100 leading experts and supported by the Fisheries Society of the British Isles. The global approach makes this book essential reading for fish biologists, fisheries scientists and ecologists and upper level students in these disciplines. Libraries in all universities and research establishments where biological and fisheries sciences are studied and taught should have multiple copies of this hugely valuable resource. About the Editor John Craig is Editor-in-Chief of the Journal of Fish Biology and has an enormous range of expertise and a wealth of knowledge of freshwater fishes and their ecology, having studied them around the globe, including in Asia, North America, Africa, the Middle East and Europe. His particular interests have been in population dynamics and life history strategies. He is a Fellow of the Linnean Society of London and the Royal Society of Biology.