Movement Behavior and Habitat Selection of the Endangered June Sucker (Chasmistes Liorus) in Utah Lake, Utah PDF Download
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Author: Kris Allen Buelow Publisher: ISBN: 9781109792577 Category : June sucker Languages : en Pages : 77
Book Description
The June sucker (Chasmistes liorus) is endemic to Utah Lake, Utah, and has been listed as an endangered species with current population estimates as low as 300 adults. Little is known about the fish's behavior or habitat requirements due to their low numbers and the size of Utah Lake. In this study methods were developed to address these challenges using radio/acoustic telemetry over all four seasonal. Manual and fixed position monitoring methods were used to collect fish abundance and movement data for tagged fish. Fish were monitored at the mouth of spawning tributaries to determine the extent of tributary use. Lake wide fish distributions were monitored using a randomly deployed hydrophone system in a paired sample scheme so that comparisons could be made between limnetic and littoral habitat use. Data summarized in this study have been important in managing and monitoring wild populations of June sucker in their natural habitat.
Author: Kris Allen Buelow Publisher: ISBN: 9781109792577 Category : June sucker Languages : en Pages : 77
Book Description
The June sucker (Chasmistes liorus) is endemic to Utah Lake, Utah, and has been listed as an endangered species with current population estimates as low as 300 adults. Little is known about the fish's behavior or habitat requirements due to their low numbers and the size of Utah Lake. In this study methods were developed to address these challenges using radio/acoustic telemetry over all four seasonal. Manual and fixed position monitoring methods were used to collect fish abundance and movement data for tagged fish. Fish were monitored at the mouth of spawning tributaries to determine the extent of tributary use. Lake wide fish distributions were monitored using a randomly deployed hydrophone system in a paired sample scheme so that comparisons could be made between limnetic and littoral habitat use. Data summarized in this study have been important in managing and monitoring wild populations of June sucker in their natural habitat.
Author: Joshua Daniel Kreitzer Publisher: ISBN: Category : Languages : en Pages : 36
Book Description
The spatial scales at which ecological phenomena are viewed constrain the results of interactions between species and their environments. In lake ecosystems, important dynamics have been identified at the landscape scale and the macrohabitat scale. To determine if landscape-scale effects and macrohabitat-scale effects are important in survival and growth of young June suckers, we compared variation among sites in Utah Lake. Large semi-permeable cages were used to house June suckers in situ at five sites representing landscape-scale variation and two sites representing macrohabitat-scale variation in Utah Lake. We compared survival and growth among sites and related it to resource availability (zooplankton abundances), temperature, and disturbance regime to determine if these were possible drivers of variation. Provo Bay had the highest mean survival and high survival in all four cages. Growth differed among sites: Provo Bay and the northwest site had the highest and lowest mean growth rates, respectively. Survival was higher in vegetated water than open water, whereas growth was significantly higher in open water. Zooplankton densities were highest in Provo Bay and the open water habitat, suggesting a positive relationship between food abundance and growth. Temperature patterns were not consistent with differences in growth among sites. Disturbance was greater in the open lake, which may partly explain the higher survival rates in Provo Bay.
Author: David B. Gonzalez Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 48
Book Description
Density-dependence is considered one of the most important regulators of population growth, and it has been documented across a wide variety of species. Typically, population growth rate and components thereof decline with increasing density (i.e., negative density-dependence); however, in species that exhibit high population densities and social behavior, positive density-dependence (i.e., Allee effect) may occur at low density. June sucker, a federally endangered lake sucker endemic to Utah Lake, Utah, USA, occurred historically at high density, and it exhibits coordinated feeding behavior. These characteristics indicate a potential for the existence of an Allee effect at current low population densities. To determine effects of density on growth, survival, and diet, I experimentally manipulated density of young June sucker in replicated enclosures in a natural environment. Larval June sucker were placed in enclosures at four different densities, and growth, survival, and diet of fish, and availability of prey (to determine selectivity) were measured at two time intervals. Both individual growth and survival were significantly lower at the lowest density compared to higher densities, indicative of a component Allee effect. Diets of individuals at low densities were more selective than diets of individuals at intermediate and high densities, suggesting a change in feeding strategy with density. Reduced growth and survival at low density suggests that corresponding, highly selective, feeding strategies may be less efficient than feeding strategies employed at higher densities. Allee effects appear to be an important consideration for recovery of this endangered species, and such effects may be common in historically abundant, but currently rare species.
Author: David Dudgeon Publisher: Cambridge University Press ISBN: 1108882625 Category : Nature Languages : en Pages : 517
Book Description
Growing human populations and higher demands for water impose increasing impacts and stresses upon freshwater biodiversity. Their combined effects have made these animals more endangered than their terrestrial and marine counterparts. Overuse and contamination of water, overexploitation and overfishing, introduction of alien species, and alteration of natural flow regimes have led to a 'great thinning' and declines in abundance of freshwater animals, a 'great shrinking' in body size with reductions in large species, and a 'great mixing' whereby the spread of introduced species has tended to homogenize previously dissimilar communities in different parts of the world. Climate change and warming temperatures will alter global water availability, and exacerbate the other threat factors. What conservation action is needed to halt or reverse these trends, and preserve freshwater biodiversity in a rapidly changing world? This book offers the tools and approaches that can be deployed to help conserve freshwater biodiversity.
Author: Gene S. Helfman Publisher: Island Press ISBN: 9781559635967 Category : Science Languages : en Pages : 0
Book Description
Fish Conservation offers, for the first time in a single volume, a readable reference with a global approach to marine and freshwater fish diversity and fishery resource issues. Gene Helfman brings together available knowledge on the decline and restoration of freshwater and marine fishes, providing ecologically sound answers to biodiversity declines as well as to fishery management problems at the subsistence, recreational, and commercial levels. Written in an engaging and accessible style, the book: considers the value of preserving aquatic biodiversity offers an overview of imperiled fishes on a taxonomic and geographic basis presents a synthesis of common characteristics of imperiled fishes and their habitats details anthropogenic causes of decline examines human exploitation issues addresses ethical questions surrounding exploitation of fishes The final chapter integrates topics and evaluates prospects for arresting declines, emphasizing the application of evolutionary and ecological principles in light of projected trends. Throughout, Helfman provides examples, explores case studies, and synthesizes available information from a broad taxonomic, habitat, and geographic range. Fish Conservation summarizes the current state of knowledge about the degradation and restoration of diversity among fishes and the productivity of fishery resources, pointing out areas where progress has been made and where more needs to be done. Solutions focus on the application of ecological knowledge to solving practical problems, recognizing that effective biodiversity conservation depends on meeting human needs through management that focuses on long term sustainability and an ecosystem perspective.
Author: Kris Allen Buelow
Author: Kris Allen Buelow
Author: Joshua Daniel Kreitzer
Author: Kristine W. Wilson
Author: Eric J. Billman
Author: David B. Gonzalez
Author: U.S. Fish and Wildlife Service. Region 6, Colorado
Author: David Dudgeon
Author: Gene S. Helfman
Author: Nature Conservancy (U.S.)
Author: Council on Environmental Quality (U.S.)