NDLI: Temperature effects on herbivory for an Indo-Pacific parrotfish in Panamá: implications for coral

Content Provider	Springer Nature Link
Author	Smith, T. B.
Copyright Year	2007
Abstract	An assumption that a positive relationship exists between temperature and herbivorous fish grazing rates in coral reef environments has been used to explain seasonal and latitudinal trends in herbivore pressure. However, this assumption has not been systematically quantified over short-term (hours–days) changes in temperature, avoiding the confounding influences that can occur on seasonal or latitudinal scales. This study measured grazing activities of the pan Indo-Pacific parrotfish Scarus ghobban over short-term changes in temperature in upwelling and non-upwelling environments on the Pacific coast of Panamá. Individual juvenile fish were followed over naturally varying temperatures to determine their bite rates (bites min−1), the foray frequency (forays min−1) and bites per foray. In the upwelling environment, there was a significant positive correlation between temperature and bite rate (R Partial = 0.63, P < 0.0001) and there was a marked fourfold change in bite rates over the range of temperatures encountered in the study (21.2–29.4°C). Bites per foray were also positively correlated to temperature (R partial = 0.27, P < 0.0001), and tide height (R partial = 0.26, P < 0.001), whilst foray frequency was positively correlated to temperature (R partial = 0.63, P < 0.0001), but negatively to tide height (R partial = −0.31, P < 0.0001). The effect of temperature on grazing rates may explain differences in herbivore pressure across different thermal environments and may be a factor contributing to algal biomass increases in low-temperature coral reef environments.
Starting Page	397
Ending Page	405
Page Count	9
File Format	PDF
ISSN	07224028
Journal	Coral Reefs
Volume Number	27
Issue Number	2
e-ISSN	14320975
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-12-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Herbivory Temperature Upwelling Scarus ghobban Bite rates Oceanography Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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