A Study of Pallid Sturgeon and Shovelnose Sturgeon Reproduction PDF Download
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Author: Catherine J. Henry
Publisher:
ISBN:
Category : Endangered species
Languages : en
Pages : 0
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Author: Catherine J. Henry
Publisher:
ISBN:
Category : Endangered species
Languages : en
Pages : 0
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Author: Mark Lee Wildhaber
Publisher: Geological Survey (USGS)
ISBN: 9781411319059
Category : Shovelnose sturgeon
Languages : en
Pages : 18
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Author: Carl E. Korschgen
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Mark P. Dryer
Publisher:
ISBN:
Category : Endangered species
Languages : en
Pages : 70
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Author:
Publisher:
ISBN:
Category : Pallid sturgeon
Languages : en
Pages : 18
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Book Description
Intensive management of the Missouri and Mississippi Rivers has resulted in dramatic physical changes to these rivers. These changes have been implicated as causative agents in the decline of pallid sturgeon. The pallid sturgeon, federally listed as endangered, is endemic to the turbid waters of the Missouri River and the Lower Mississippi River. The sympatric shovelnose sturgeon historically was more common and widespread than the pallid sturgeon. Habitat alteration, river regulation, pollution, and over-harvest have resulted in the now predictable patterns of decline and localized extirpation of sturgeon across species and geographic areas. Symptomatic of this generalized pattern of decline is poor reproductive success, and low or no recruitment of wild juveniles to the adult population. The purpose of this report is to introduce a conceptual life-history model of the factors that affect reproduction, growth, and survival of shovelnose and pallid sturgeons. The conceptual model provided here was developed to organize the understanding about the complex life history of Scaphirhynchus sturgeons. It was designed to be used for communication, planning, and to provide the structure for a population-forecasting model. These models are intended to be dynamic and responsive to new information and changes in river management, thereby providing scientists, stakeholders, and managers with ways to improve understanding of the effects of management actions on the ecological requirements of Scaphirhynchus sturgeons. As new scientific knowledge becomes available, it could be included in the model in many ways at various integration levels.
Author:
Publisher:
ISBN:
Category : Endangered species
Languages : en
Pages : 14
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Author:
Publisher:
ISBN:
Category : Endangered species
Languages : en
Pages : 2
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Author: Ryan M. Boley
Publisher:
ISBN:
Category :
Languages : en
Pages : 174
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The pallid sturgeon (Scaphirhynchus albus ) and shovelnose sturgeon (S. platorynchus ) are benthic freshwater fishes that are sympatric throughout the range of the pallid sturgeon. Pallid sturgeon was listed as endangered under the Endangered Species Act in 1990, while shovelnose is common throughout the range. Previous abundance studies estimate the ratio of adult pallid to shovelnose sturgeon to be on the order of 1:82 in the middle Mississippi River, respectively. Despite adult abundances, reproduction and/or recruitment of pallid sturgeon larvae is undocumented in the middle Mississippi River. The current study aims to confirm the presence of pallid sturgeon reproduction and estimate the relative species abundances of larval pallid, shovelnose and hybrid sturgeon in the middle Mississippi River. Since larval pallid, shovelnose and hybrid sturgeon are virtually identical morphologically, the use of DNA markers was required for species designations; sixteen previously developed microsatellite loci were used in this study. Of the 583 larval Scaphirhynchus sturgeon collected from the middle Mississippi River, 581 were shovelnose, one was a hybrid and one was a pallid. This study was the first to genetically confirm the presence of pallid sturgeon reproduction in the middle Mississippi River. Differences in species ratios between adult and larval Scaphirhynchus sturgeon could be explained by three potential hypotheses; life history characteristics accentuate species ratios between adult and larval stages, pallid are experiencing low reproduction and/or low recruitment, or pallid larvae reside in different microhabitat locations compared to shovelnose.
Author: U.S. Department of the Interior
Publisher: CreateSpace
ISBN: 9781496120069
Category : Nature
Languages : en
Pages : 68
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This report provides a synthesis of results obtained between 2005 and 2008 from the Comprehensive Sturgeon Research Program, an interagency collaboration between the U.S. Geological Survey, Nebraska Game and Parks Commission, U.S. Fish and Wildlife Service, and the U.S. Army Corps of Engineers' Missouri River Recovery Integrated Science Program. The goal of the Comprehensive Sturgeon Research Program is to improve fundamental understanding of reproductive ecology of the pallid sturgeon with the intent that improved understanding will inform river and species management decisions.
Author: Grant Gerald Grisak
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 166
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