大亚湾潮间带底栖生物种类组成与分布

于１９８８年９月－１９８９年１月在大亚湾潮间带采集底栖动物标本，经分类研究发现，共有５４７种，其中藻类９１种，多毛类１２０种，软体动物２０９种，甲壳动物８３种，棘皮动物１９种，其他动物２５种。研究表明，其区系性质以热带亚热带暖水种占多数，有许多热带种发展成优势种。在水平分布上，岩石相种类（３１６）＞沙滩种数（２２２）＞红树林泥滩（５１）；在垂直分布上，中潮区种数（３９８）＞低潮区（２２１）＞红树林

SPECIES COMPOSITION AND DISTRIBUTION OF BENTHOS IN INTERTIDAL ZONE OF DAYA BAY

Benthos were collected in the intertidal zone of Daya Bay from September 1988 to January 1989 for evaluating the effect of the nuclear power station there on marine environment.20 intertidal benthic transections were set up at the rocky, sandy, and mangrove muddy shore Of 547 benthic fauna species were identified; 91 species of algae, 120 species of poly-chaetes, 209 species of molluscs. 83 species of crustaceans, 19 species of echinoderms, 25 miscellaneous species. Molluscs, polychaetes, algae and crustaceans comprised 91.95% of all species and were the four main groups of benthos in intertidal zone of Daya Bay.According to faunal nature, intertidal benthos in Daya Bay can be divided into four groups: 1. Tropical-subtropical warm water species distributed in the East China Sea and the South China Sea. 2. Eurythermic-eurytopic species distributed from the Bo-Yellow Sea to the South China Sea. 3. Warm temperature species distributed in the Yellow-Bo Sea. 4. Tropical nature species distributed only in the South China Sea.The horizontal distribution of benthos species number is more at rocky shore (316) than sandy shore (222), and more at sandy shore than mangrove muddy shore (51); the vertical distribution of species is more at the middle tidal zone (398) than at the low tidal zone (221), and more at the low tidal zone than at the high tidal zone (36). The characteristic of the composition and distribution of benthos species is related mainly to the environmental factors of sediments form, tidal flow, current, and temperature.The horizontal species distribution shows the effect of sediments form on benthos, the vertical species distribution shows the tidal effect on tidal to benthos, the seasonal variation of species shows the effect of temperature on benthos, the difference of species compositon between exposed, semiexposed and sheltered shore in same ecological phase shows the effect of current to benthos.