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Evidence of Adaptation to Environmental Temperatures in Three Species of Gambusia (Poeciliidae)
Don W. Hagen
The Southwestern Naturalist
Vol. 9, No. 1 (Apr. 10, 1964), pp. 6-19
Published by: Southwestern Association of Naturalists
Stable URL: http://www.jstor.org/stable/3669098
Page Count: 14
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Thermal tolerances were determined for 3 species of Gambusia under standardized conditions. Females of all were more tolerant of heat than males. Neither size nor gravidity influenced thermal tolerance, but fry of G. affinis were remarkably tolerant to high temperatures. Adaptation to the local habitat temperatures was found in G. affinis. The 3 species of Gambusia are well adapted to the contrasting thermal characteristics of their habitats.
The Southwestern Naturalist © 1964 Southwestern Association of Naturalists