Species diversity and distribution of mangrove-associated red alga Bostrychia (Rhodomelaceae, Rhodophyta) from southern Thailand

摘要

The diversity and distribution of Bostrychia in Thailand were conducted to fill up document in comparison with that of research in others areas and updated information. Four sites along the Andaman Sea: Ranong, Phangnga, Phuket, and Krabi provinces and three sites on the Gulf of Thailand: Chumphon, Surat Thani, and Nakhon Si Thammarat provinces were studied. Algal samples were collected every 2 months during October 2012 to August 2013. The algal distribution with respect to the zonation, water, and sediment characteristics were compared between sites, among transects and among quadrats (50 × 50 cm~2). The results indicated that intertidal position within sites have the greatest influence on algal frequency. Individual species dominated in different intertidal zones. Eight species of Bostrychia was detected: Bostrychia binderi Harvey, B. calliptera (Montagne) Montagne, B. kelanensis Grunow, B. moritziana (Sonder ex Kuetzing) J. Agardh, B. radicans (Montagne) Montagne, B. radicosa (Itono) J. A. West, G. C. Zuccarello and M. H. Hommersand, B. simpliciuscula Harvey ex J. Agardh and B. tenella (Lamouroux) J. Agardh. Bostrychia moritziana, B. radicans and B. tenella were abundant and common on both coasts of Thailand, whereas B. calliptera was scarce and restricted to the Andaman Sea. These results suggest that the abundance and distribution patterns of algal communities were likely to be influenced by seasonal variation, wave action, sediment, nutrients and other chemical-physical parameters and habitat conditions.