Growth and Survival of Apache Trout Under Static and Fluctuating Temperature Regimes

Autor: Olin G. Feuerbacher, Matthew S. Recsetar, Scott A. Bonar
Rok vydání: 2014
Předmět:
Zdroj: Transactions of the American Fisheries Society. 143:1247-1254
ISSN: 1548-8659
0002-8487
DOI: 10.1080/00028487.2014.931298
Popis: Increasing stream temperatures have important implications for arid-region fishes. Little is known about effects of high water temperatures that fluctuate over extended periods on Apache Trout Oncorhynchus gilae apache, a federally threatened species of southwestern USA streams. We compared survival and growth of juvenile Apache Trout held for 30 d in static temperatures (16, 19, 22, 25, and 28°C) and fluctuating diel temperatures (±3°C from 16, 19, 22 and 25°C midpoints and ±6°C from 19°C and 22°C midpoints). Lethal temperature for 50% (LT50) of the Apache Trout under static temperatures (mean [SD] = 22.8 [0.6]°C) was similar to that of ±3°C diel temperature fluctuations (23.1 [0.1]°C). Mean LT50 for the midpoint of the ±6°C fluctuations could not be calculated because survival in the two treatments (19 ± 6°C and 22 ± 6°C) was not below 50%; however, it probably was also between 22°C and 25°C because the upper limb of a ±6°C fluctuation on a 25°C midpoint is above critical thermal maximum for Apa...
Databáze: OpenAIRE
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