Hypoxia and Sturgeons: report to the Chesapeake Bay Program Dissolved Oxygen Criteria Team

Secor, David H. and Niklitschek, Edwin J. (2001) Hypoxia and Sturgeons: report to the Chesapeake Bay Program Dissolved Oxygen Criteria Team. Solomons, MD, University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory, (UMCES Technical Series, 314-01) (UMCES CBL 01-0080).

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Abstract

In this essay, three lines of evidence are developed that sturgeons in the Chesapeake Bay and elsewhere are unusually sensitive to hypoxic conditions: 1. In comparison to other fishes, sturgeons have a limited behavioral and physiological capacity to respond to hypoxia. Basal metabolism, growth, and consumption are quite sensitive to changes in oxygen level, which may indicate a relatively poor ability by sturgeons to oxyregulate. 2. During summertime, temperatures >20 C amplify the effect of hypoxia on sturgeons and other fishes due to a temperature*oxygen "squeeze" (Coutant 1987)- In bottom waters, this interaction results in substantial reduction of habitat; in dry years, nursery habitats in the Chesapeake Bay may be particularly reduced or even eliminated. 3. While evidence for population level effects by hypoxia are circumstantial, there are corresponding trends between the absence of Atlantic sturgeon reproduction in estuaries like the Chesapeake Bay where summertime hypoxia predominates on a system-wide scale. Also, the recent and dramatic recovery of shortnose sturgeon in the Hudson River (4-fold increase in abundance from 1980 to 1995) may have been stimulated by improvement of a large portion of the nursery habitat that was restored from hypoxia to normoxia during the period 1973-1978. (PDF contains 26 pages)

Item Type: Monograph or Serial Issue
Title: Hypoxia and Sturgeons: report to the Chesapeake Bay Program Dissolved Oxygen Criteria Team
Personal Creator/Author:
CreatorsEmail
Secor, David H.
Niklitschek, Edwin J.
Series Name: UMCES Technical Series
Number: 314-01
Date: 2001
Publisher: University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
Place of Publication: Solomons, MD
Projects: University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
Issuing Agency: University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
Uncontrolled Keywords: Sturgeon; hypoxia; respirometry; basal metabolism; Acipenser stellatus; basal metabolism; shortnose sturgeon; rainbow trout; demersal; bioenergetics; Magothy; Fishing Bay; Susquehanna Flats; Severn; Choptank; Nanticoke; Potomac; Delaware Bay; York; Rappahannock; South Carolina; Hudson;
Subjects: Ecology
Conservation
Fisheries
Aquaculture
Environment
Item ID: 3023
Depositing User: Kathleen Heil
Date Deposited: 19 Mar 2010 12:19
Last Modified: 29 Sep 2011 18:02
URI: http://aquaticcommons.org/id/eprint/3023

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