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Morphological Adaptations of Cyprinodontoids for Inhabiting Oxygen Deficient Waters

William M. Lewis, Jr.
Copeia
Vol. 1970, No. 2 (Jun. 1, 1970), pp. 319-326
DOI: 10.2307/1441653
Stable URL: http://www.jstor.org/stable/1441653
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Morphological Adaptations of Cyprinodontoids for Inhabiting Oxygen Deficient Waters
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Abstract

A previously unrecognized morphological adaptation of fishes to oxygen depletion is described. Natural oxygen depletion was simulated by use of sodium sulfite. It was demonstrated that some fishes are adapted to permit use of an oxygen rich layer of water at the atmosphere-water interface. Representative cypronodontoids (Fundulus notatus, Gambusia affinis, and Poecilia reticulata) exhibited maximum adaptation and the greatest survival ability of the species tested. Notemigonus crysoleucas, Brachydanio rerio, Lepomis macrochirus, and L. cyanellus, representing other suborders, showed less adaptation to these conditions and correspondingly lower survival. Micropterus salmoides seemed unadapted for survival in oxygen depleted waters. Carassius auratus exhibited a physiological adaptation, but used the oxygen rich surface water as a supplement.

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