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1 July 2002 Thermal Tolerance and Growth Differences in Orangethroat Darter (Etheostoma spectabile) from Thermally Contrasting Adjoining Streams
K. T. STRANGE, J. C. VOKOUN, D. B. NOLTIE
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Abstract

Orangethroat darters Etheostoma spectabile occupying thermally contrasting streams within the same watershed were tested for differences in thermal responses by comparing their critical thermal maxima (CTM) and short-term growth. Individuals from a spring branch population had a lower CTM, better growth at low temperatures and more inhibited growth at higher temperatures compared to individuals collected from a thermally variable adjoining stream reach. The findings support the contention that intraspecific differences in thermal tolerance and growth may exist at relatively localized scales within a small watershed.

K. T. STRANGE, J. C. VOKOUN, and D. B. NOLTIE "Thermal Tolerance and Growth Differences in Orangethroat Darter (Etheostoma spectabile) from Thermally Contrasting Adjoining Streams," The American Midland Naturalist 148(1), 120-128, (1 July 2002). https://doi.org/10.1674/0003-0031(2002)148[0120:TTAGDI]2.0.CO;2
Received: 26 March 2001; Accepted: 1 January 2002; Published: 1 July 2002
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