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Trend in Coral-Algal Phase Shift in the mandapam Group of Islands, Gulf of mannar marine Biosphere Reserve, India

Journal of Ocean University of China 2016年第6期15卷 1080-1086页

作者： m. machendiranathan L. Senthilnathan R. Ranith A. saravanakumar T. Thangaradjou S. B. Choudhrys S. K. Sasama Center of Advanced Studies in marine Biology Faculty of Marine Sciences Annamalai University Parangipettai - 608502 Tamilnadu India Academy of maritime Education and Training (AmET) University Center for Maritime Information ServicesChennai - 603112 Tamilnadu India Central marine Fisheries Research Institute ( CmFRI) Fishery Environment Management DivisionKochi - 682018 Kerala India Science and Engineering Research Board (SERB) New Delhi - 110070 India National Remote Sensing Center lndian Space Research Organization (Dept. of Space Govt. of India)Balanagar Hyderabad - 500625 Andhra Pradesh lndia

The present study revealed proliferation of macro-algae modifying coral reef ecosystems in a different manner due to diseases and sedimentations in the mandapam group of islands in the Gulf of mannar. Benthic surveys were conducted with major attack of seven coral reefs diseases with high sedimentation rate, nine species of fleshy macro-algae(Turbinaria ornata, Turbinaria conaides, Caulerpa scalpelliformis, Caulerpa racemosa, Kappaphycus alvarezii, Padina gymnosphora, Sargassum wightii, Ulva reticulata and Calurpa lentillifera) proliferation against major corals life forms(Acropora branching, Acropora digitate, Acropora tabulate, coral massive, coral submassive, coral foliose and coral encrusting). The results confirm that diseased corals most favor to macro-algae growth(15.27%) rather than the sedimentation covered corals(8.24 %). In the degradation of coral life forms, massive corals were more highly damaged(7.05%) than any other forms. Within a short period of time(may to September), coral coverage shrank to 17.4% from 21.9%, macro-algae increased 23.51% and the average sedimentation rate attained 77.52 mg cm^(-2) d^(-1) with persisting coral reef diseases of 17.59%. The Pearson correlation showed that the coral cover decreased with increasing macro-algae growth, which was statistically significant(r =-0.774, n = 100, P macro-algae C. scalpellifrmis, T. ornata, C. racemosa, T. conaides, U. reticulata, S. wightii, K. alvarezii, P. gymnosphora and C. lentillifera increased with percentages of 6.0, 5.8, 5.7, 4.9, 4.2, 3.7, 2.7 and 1.9, respectively. If this trend continues, the next generation of new recruit corals will undoubtedly lead to a phase shift in Gulf of mannar corals.

关键词：珊瑚藻生物圈保护区相移平均沉积速率宏观藻类海洋印度沉积作用

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New Discovery of Coral Rubbings in the North-Western Gulf of Kachchh, Gujarat, Western India-GIS Based Evaluation

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Journal of Ocean University of China 2011年第2期10卷 153-156页

作者： J. Sesh Serebiah m. Rajkumar SUN Jun B. A. Venmathi maran A. saravanakumar G. A. Thivakaran marine Studies and Coastal Resource management Madras Christian College Tambaram Chennai 600-059 Tamil Nadu India Centre of Advanced Study in marine Biology Annamalai University Parangipettai 608-502 Tamil Nadu India Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 P. R. China Takehara marine Science Station Graduate School of Biosphere Science Hiroshima University Minato machi 5-8-1 Takehara 725-0024 Hiroshima Japan Gujarat Institute of Desert Ecology Bhuj - 370-001 Gujarat India

The Gulf of Kachchh in western India, with its arid climate, large semi-diurnal tidal amplitudes, negative water balance and near-pristine water quality, is being extensively developed as oil importing bases for economic reasons in connection with its proximity to the oil exporting countries of the middle East. Besides, new coral rubbings were sighted in Jakhau, north-western Gulf of Kachchh. Dredging in mandvi of the north Gulf covering 3.5 km2 revealed a similar assortment of live corals with their associated flora and fauna. These pioneering observations demonstrate that there exist live corals of young polyps-colony of Favia sp. belonging to the family Faviidae in the north-western Gulf of Kachchh. The environmental parameters there were carefully recorded as: surface water temperature (℃) varying from 29 to 31.8, salinity (ppt), pH, dissolved oxygen (mgL-1) and total suspended solids (mgL-1) in the ranges of 37- 43.5, 7.7- 8.45, 5.4 - 6.8 and 11- 31, respectively.

关键词：地理信息系统海湾珊瑚西部印度评价石油进口干旱气候

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