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Title: Observations on the reproduction of Acropora corals along the Tuticorin coast of the Gulf of Mannar, Southeastern India
Authors: Raj, K Diraviya
Edward, J K Patterson
Keywords: Acropora
Spawning
Immature
Mature
Reproduction
Issue Date: Jun-2010
Publisher: CSIR
Abstract: Pattern of reproduction was studied in Acropora species along Tuticorin coast in the Gulf of Mannar from 2006-2008. Extensive surveys were conducted to monitor reproductive maturity and the timing of spawning. Gametes were observed from January with colonies releasing gametes by the end of March. Acropora cytherea showed immature colonies in January (48-79%) and February (56-76%) and mature colonies in March (36-86%). Likewise, the other species of Acropora examined showed 50-75% of immature colonies in January and an increase of 10-20% of immature colonies in February, and matured in March. The average percentage of mature colonies in March was as follows, A. formosa 47-76%, A. valenciennesi 50-81%, A. intermedia 50-81%, A. nobilis 25-82%, A. micropthalma 56-83%, A. hemprichi 39-83%, A. hyacinthus 33-100%, A. corymbosa 59-65%. Spawning was observed in A. cytherea on 24 March 2006, 10 days after full moon; 28 March in 2007, 5 days prior to full moon; and 8 March 2008, 1 day after new moon. Approximately 30,000 egg and sperm bundles were observed in 1 litre of water and each bundle had 20-25 eggs in A. cytherea. Environmental parameters, especially rise in temperature at the end of March was believed to play lead role in coral spawning.
Page(s): 219-226
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Source:IJMS Vol.39(2) [June 2010]

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