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 (690Kb)
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| Kei-ichi Mito | |
| Ishigaki Tropical Station | |
| Seikai National Fisheries Research Institute | |
| Fisheries Agency of Japan | |
| 148-446 Fukai-Ohta, Ishigaki 907-045l, JAPAN | |
| Tel: +81-09508-8-2571 Fax: +81-09808-8-2573 | |
| E-mail: mito@snf-its.affrc.go.jp |
23,904,000 Yen
(FY 1999; 7,443,000 Yen)
We studied on the fish community, the community of boring benthos and borehole users, and relation between fish and zoobenthos in the coral reefs of Yaeyama Islands area for analyzing the structure of biodiversity. In the fish community, we conducted diving surveys in various area and season, it is clarified the fish community in coral reef had different species composition and had high species diversity in each environment. It could be said that very high diversity of fish community had been achieved by synergy effects with various environments. Though it was not observed definite habitat segregation in the certain area, each species distributed different positions by coral form and vertical distance from coral. In the community of boring benthos and borehole users, processes of recruitment and resource partitioning by boring benthos and borehole users in the intertidal limestone bedrock were investigated. Diversity of borehole users reflected diversity of size of rock-holes bored by multiple species of borers. Results of field experiment revealed that sipunculans colonized into small holes more frequently than smooth rock surfaces, and this would suggest that boreholes are important resources for borers themselves. In relation between fish and zoobenthos, feeding habits and foraging behavior of the three young goatfishes and distribution of their prey animals were studied in seagrass area. Smaller individuals of three goatfishes fed on copepods in water column. Parrrpenerrs barberinoides selected shrimps living on the surface of seagrass leaves and sandy bottom with growth, however larger P. multifasciaus and P. barberinus selected shrimps and crabs on sandy bottom. These results show that three young goatfishes divide microhabitats and their food resources with growth, and coexist in tropical seagrass area.
Fish community, Borers, Borehole users, Goatfishes, Division of resources