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A Comparison of Effects of Elevated Temperature versus Temperature Fluctuations on Reef Corals at Kahe Point, Oahu

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Title: A Comparison of Effects of Elevated Temperature versus Temperature Fluctuations on Reef Corals at Kahe Point, Oahu
Authors: Coles, Stephen L.
Issue Date: Jan 1975
Publisher: University of Hawai'i Press
Citation: Coles SL. 1975. A comparison of effects of elevated temperature versus temperature fluctuations on reef corals at Kahe Point, Oahu. Pac Sci 29(1): 15-18.
Abstract: Bottom temperature and the condition of live corals in the vicinity
of the discharge plume from the Hawaiian Electric Company Kahe Generating
Station, Oahu, Hawaii, were monitored August-December 1973. Mortality to
Pocillopora meandrina, the most thermally sensitive species of the area, was no
greater under conditions of maximum thermal enrichment near the living reef
fringe in the discharge area (1-2 m depth) than in an area (4-5 m depth) more distant from the discharge. Sublethal coral damage was more pronounced near the
discharge, but was mostly limited to loss of zooxanthellar pigment which was
restored following yearly ambient temperature maxima. Although bottom temperatures
in the discharge area continually varied 30-40 C within minute periods
during every low tide, live corals seldom encountered temperatures exceeding
31 0 C. The limited damage that occurred to live corals indicates that upper absolute
temperatures are more critical in producing coral damage than are short-term
temperature shocks near upper lethal limits.
URI/DOI: http://hdl.handle.net/10125/905
ISSN: 0030-8870
Appears in Collections:Pacific Science Volume 29, Number 1, 1975



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