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Responses of Selected Texas Fishes to Abiotic Factors, and an Evaluation of the Mechanisms Controlling Thermal Tolerance of the Sheepshead Minnow

Low oxygen tolerances of ten fishes were estimated using an original nitrogen cascade design, and reciprocally transformed to express responses as ventilated volume necessary to satisfy minimal oxygen demand (L·mg O2^-1). Values ranged from 0.52 to 5.64 L·mg^-1 and were partitioned into three statistically distinct groups. Eight stream fishes showed moderately high tolerances reflecting metabolic adaptations associated with stream intermittency. Juvenile longear sunfish and two mollies comprised the second group. High tolerance of hypoxia may allow juvenile sunfish to avoid predation, and mollies to survive harsh environmental oxygen regimens. The sheepshead minnow was the most tolerant species of low oxygen, of those examined, explaining its presence in severely hypoxic environments.

Identiferoai:union.ndltd.org:unt.edu/info:ark/67531/metadc277819
Date05 1900
CreatorsBennett, Wayne A. (Wayne Arden)
ContributorsBeitinger, Thomas L., Waller, William T., Dickson, Kenneth L., Acevedo, Miguel F., Zimmerman, Earl G.
PublisherUniversity of North Texas
Source SetsUniversity of North Texas
LanguageEnglish
Detected LanguageEnglish
TypeThesis or Dissertation
Formatix, 194 leaves : ill., Text
CoverageUnited States - Texas
RightsPublic, Copyright, Copyright is held by the author, unless otherwise noted. All rights reserved., Bennett, Wayne A. (Wayne Arden)

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