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n African Zoology - Effects of temperature and salinity on resting metabolism in two South African rock pool fish : the resident gobiid and the transient sparid

Volume 44, Issue 2
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X
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Abstract

Intertidal rock pools are inherently dynamic environments that experience marked changes in physico-chemical parameters over diel, tidal and seasonal time scales. Fish that inhabit the intertidal zone can generally be characterized as either permanent residents or transients / visitors. This study investigates the resting metabolic rate (RMR; mg O g/h) of the resident rock pool fish and the transient sparid at a range of salinities (5, 15, 25, 35 and 45 PSU) and temperatures (14, 20 and 28°C) using closed-vessel respirometry. Both species were temperature sensitive, with Q of 1.82 and 2.07, respectively. A significant positive relationship ( =0.03) between salinity and oxygen consumption was determined for , but not for . The RMR values were significantly higher ( < 0.01) for compared to at all temperatures and at all salinities, except 5 PSU. This was attributed to the different biologies of the two species, being a bottom-dwelling species and a mid-water species. It is suggested that the decreased temperature sensitivity and euryhaline characteristics of compared to , would allow the former to more effectively penetrate the upper intertidal zone.

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/content/afzoo/44/2/EJC18122
2009-10-01
2020-09-25

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