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Search Result: 1 records
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1.
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Marcus, J. and A. Thorhaug,
1982
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Pacific versus Atlantic responses of the subtropical hermatypic coral Porites spp. to temperature and salinity effects,
p. 15-20. In: E.D. Gomez, C.E. Birkeland, R.W. Buddemeier, R.E. Johannes, J.A. Marsh, Jr. and R.T. Tsuda (eds.) Proceedings of the 4th International Coral Reef Symposium Vol. 2. Marine Science Center, University of the Philippines, Manila, Philippines.
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Ref ID
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8979
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Author
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Marcus, J. and A. Thorhaug
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Year
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1982
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Title
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Pacific versus Atlantic responses of the subtropical hermatypic coral Porites spp. to temperature and salinity effects,
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Source
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p. 15-20. In: E.D. Gomez, C.E. Birkeland, R.W. Buddemeier, R.E. Johannes, J.A. Marsh, Jr. and R.T. Tsuda (eds.) Proceedings of the 4th International Coral Reef Symposium Vol. 2. Marine Science Center, University of the Philippines, Manila, Philippines.
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Keywords
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Stress, Temperature, Salinity, Adaptation, ICRS4
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Caption
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Hard copies of this symposium proceedings may be purchased from
The Marine Science Institute, College of Science, University of the Philippines,
Velasquez St., Diliman, Quezon City, Philippines.
Tel: (63 2) 922-3959 Fax: (63 2) 924-7678
msi.publications@upmsi.ph
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Abstract
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A major ques~ion of physiological ecology of subtropical and tropical marine benthic corals is whether, over
recent geological time, corals in various temperature regimes have been provided sufficient environmental
pressure to evolve differing physiological tolerance levels. One subset from this question is whether Atlantic versus
Pacific subtropical and tropical corals have similar tolerance levels to the major environmental parameters of
temperature and salinity (particularly important as one attempts to set standards for environmental management).
The upper thermal tolerances of Atlantic vs. Pacific subtropical coral were examined in the laboratory using
Porites porites (Key Largo, Florida, 3 m) and of Porites compressa (Makapuu Point, Oahu, Hawaii, 10 mI. The
corals were held in fifteen 20 1 aquaria with salinity 33 ppt and light intensities from 140 to 170 p.Em.2 sec'!. At
26 °C Porites from both Hawaii and Florida survived 20 days without any evidence of stress. Indication of stress
occurred at higher temperatures in Atlantic and in Hawaiian Porites and were as follows: at 31°C, a slight loss of
pigment after 5 days; at 32°C, pigment loss on branches after 3 days; and at 33°C, all colonies totally bleached
within 48 h. Similar results were found for the Florida Porites; however, the Atlantic specimens tested were more
tolerant than the Hawaiian by one degree E, e. g., after 48 h, total bleaching occurred at 34 °C. Pigment loss was
attributed to the expulsion of the symbiotic zooxanthellae. Salinity tolerances (26°C) were the following: at 20
ppt and 40 ppt, after 5 days, Hawaiian Porites demonstrated production of mucus and expulsion of zooxanthellar
pigments; at 15 ppt and 45 ppt within 5 days, a moribund condition occurred. Similar reactions were
observed in the Florida specimens at the same salinities.
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