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Six growth forms were observed, all of which were represented in Port Royal. Dawkins Pond andHunts Bay contained only those forms that covered the roots in a mat of creeping colonies. Thehighest abundance, measured as percentage cover, was observed in Hunts Bay (70.03 - 71.46%) andleast in the Great Salt Pond (2.04 - 3.84%). Salinity, suspended solids, temperature and dissolvedoxygen were measured at all stations. Reduced salinity corresponded to periods of elevated rainfalland the salinity for Hunts Bay was consistently lower than that obtained at the other locations.Elevated levels of suspended solids appear to be associated with periods of lowered salinities. Watertemperature tended to be uniform throughout the water column with the highest temperaturesobserved in Hunts Bay and the lowest in Great Salt Pond. Dissolved oxygen was variable andtended to decrease with depth at all stations.Correlation coefficient calculations indicated a weak association between the environmental variablesand the abundance and distribution patterns of the bryozoan communities, however, despite the weakcorrelation temperature and salinity, which were very variable in Hunts Bay, may offer someexplanation.O-7 CHANGES IN POLYP SIZE IN MONTASTRÆA ANNULARIS:AN EFFECT OF BLEACHINGJ. M. Mendes 1 and J. D. Woodley 21Department of Life Sciences and 2 Centre for Marine Sciences, MonaFifteen (15) colonies of Montastræa annularis located at a depth of 5m were marked in August1994 or March 1995. Samples of tissue and skeleton were taken using a 1.5 inch hole saw, everyfull moon or every full moon and new moon until March 1996. Additional samples were takenoccasionally thereafter until October 1997. Measurement of polyp depth was made on skeletal slabsin which the tissue had been fixed and then air-dried. A bleaching event began at the end ofSeptember 1995. Six (6) of the 15 marked colonies bleached. The most severely effected coloniesremained completely bleached for 4 months.Prior to bleaching the polyps showed a regular variation in depth, with a mean depth of 3.88 ±0.3mm. During bleaching, polyp depth decreased. Reduction in polyp depth was directly related tothe length of time the colony remained bleached.Mean polyp depth after 4 months of bleaching was 2.00 ± 0.4 mm. Once the colonies had returnedto their normal colour, it took an additional 4 - 8 weeks for the polyps to return to their normal size.The results of this study support the suggestion of Barnes and Lough (1992) that polyp tissue depthcould be used as an indication of coral colony health / nutritional status. It could be particularlyuseful for bleaching events where observations are often sporadic, if the mean polyp depth waspreviously known.ReferenceBarnes, D.J. & Lough, J.M. (1992). Systematic variations in the depth of sketeton occupied bycoral tissue in marine columns of Porites from the Great Barrier Reef. J. Exp. Mar. Biol. Ecol.159: 113-128.26
O-8 DISCOVERY BAY REEFS: ARE THEY RECOVERING?COMPARISON WITH PAST STUDIESLeandra Cho and Jeremy WoodleyCentre for Marine SciencesThe coral reefs of Discovery Bay have suffered from large scale degradations since 1980 whichresulted in a decline of coral diversity and abundance. Phase shifts in community structure resultedin macroalga dominated reefs (Liddell & Ohlhorst, 1992; Andres & Witman, 1995; Hughes, 1994).The changes are believed to have been induced by decades of increasing chronic disturbance fromterrestrial runoff and overfishing followed by acute catastrophic events, with the advent of HurricaneAllen in 1980 and the mass mortality of the herbivorous sea-urchin Diadema antillarum. The resultof such extensive disturbance in a relatively short period of time resulted in further decline of reefs.Studies from the last 15 years showed a decline in coral cover from 30-60% in 1977, to 5-25% in1984 after Diadema die-off, to £5% coverage above depths of 30m in 1992. Macroalga coverincreased from 5% to 79%.The study area covered 10km of the coastline east of Rio Bueno to the west of Pear Tree River. Atotal of 27 sites was identified to investigate variation in coral abundance and diversity betweendifferent localities, and to determine if reported coral cover of
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Page 6 and 7: FREE ORAL PRESENTATIONSChemistry Le
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Thiara granifera is gregarious, pro
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The population of the CLM in Jamaic
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The present studies were undertaken
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P-21 ANTIFEEDANT PROPERTIES OF VARI
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ReferencesClarke-Harris, D.O. (1998
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Mansingh, A., Robinson, D.E. and Da
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P-24 THE NEW JAMAICA SEISMOGRAPH NE
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P-26 JUPITER LANDSLIDE, RIO GRANDE
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P-27 BIOSTRATIGRAPHIC INVESTIGATION
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P-28 EVALUATION OF MEDIA, METHODS O
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P-31 PHYSIOLOGICAL ECOLOGY OF TEN P
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2. Stavely, J.R., Steadman, J.R. 19
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P-36 IDENTIFICATION, DISTRIBUTION,
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Todd G. A., Daniels M. J. and Callo
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P-42 QUANTIFICATION AND IDENTIFICAT
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P-46 A STUDY OF VIBRIO SPECIES IN R
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P-49 INDOOR LEVELS OF NO2 MEASURED
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Qualitative assessment of these sig
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P-55 TRINIDAD CLAYS AS A POTENTIAL
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The procedure was applied to the Pi
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