Temperature and hypoxia tolerance of selected fishes from a hyperthermal rockpool in the dry Tortugas, with notes on diversity and behavior

Fangue, N.A., Flaherty, K.E., Rummer, J.L., Cole, G., Hansen, K.S., Hinote, R., Noel, B.L., Wallman, H., and Bennett, W.A. (2001) Temperature and hypoxia tolerance of selected fishes from a hyperthermal rockpool in the dry Tortugas, with notes on diversity and behavior. Caribbean Journal of Science, 37 (1-2). pp. 81-87.

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Abstract

We documented the physical habitat characteristics and fish diversity of a hyperthermal rockpool on Loggerhead Key in the Dry Tortugas National Park during July 2000. Rockpool temperatures ranged from 30.5 °C to 35.8 °C and oxygen varied from 6.4 to 3.5 mg/L depending on depth and time of day. Seven fish species from five families inhabited the rockpool. Critical thermal maxima (CTMax) and critical oxygen minima (COM) were measured for three species. French grunt Haemulon flavolineatum was the most temperature tolerant fish (CTMax = 37.9 °C), followed by cocoa damselfish Pomacentrus variabilis (36.1 °C), and white mullet Mugil curema (35.0 °C), respectively. Cocoa damselfish were more tolerant of hypoxic conditions (COM = 0.8 mg/L) than either French grunt (1.2 mg/L) or white mullet (1.5 mg/L). French grunt and cocoa damselfish resorted to aquatic surface respiration at respective dissolved oxygen levels of 2.6 and 1.7 mg/L, whereas white mullet did not display this behavior at oxygen concentrations as low as 1.5 mg/L. High-temperature and low-oxygen responses of the three species were not exceptional, suggesting that behavior and not physiology is the major factor allowing Loggerhead Key fishes to exploit hyperthermal habitats.

Item ID: 45328
Item Type: Article (Refereed Research - C1)
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ISSN: 0008-6452
Date Deposited: 06 Sep 2016 00:39
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060303 Biological Adaptation @ 50%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060203 Ecological Physiology @ 50%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960301 Climate Change Adaptation Measures @ 100%
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