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| ECOLOGICAL STUDIES ON THE INTERTIDAL ZONE OF THE YUSHAN ISLANDS, ZHEJIANG |
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| Yushan Island is situated on the middle part of the Zhejiang coast, 122°13’30" to 122 17’30" E 28°51’15’’ to 28°56’15" N. It consists of about twenty islets and reef. An investigation on mollusca fauna and ecological distribution was carried out by the Zhejiang College of Fisheries, from February to June 1982 and January to October 1983. In this paper, 106 species of intertidal zone mollusca in Yushan Islands are reported, belonging to 4 classes, 14 orders and 52 fimilies, among which over 40 species are chief economic species. The vertical distribution of intertidal mollusca should be classified into two types: 1. Rock ecotype: Two communities are found at the high zone: (1) Littorina brevieula Tectarium granularis community and (2 ) L. brevicula Monodonta labio community. Three communities at midzone: (1) Liloophura japonica Septifer virgatus community, (2) Ostrea echinata Thais claviger Barbatia decussata Community and (3) Chlorostomoarusticum 0. echinata community. Two communities at low-zone: (1) Thais luteostoma Modiolus barbatus community and (2) Serpulorbis "imbricota Mytilus crassitesta community. 2. Piece rocky, gravel and sand ecotype: Two communities are found at the high zone: (1) L. brevicula community and (2) Monodonta labio Notoacmea schrencki community. N. schrencki M. labio community at midzone, Chlorostoma rusticum M. labio community at low-zone. The sequence of the seasonal biomass of organisms is as follows: spring (257.09 g/m2) >winter (224.72 g/m2) >autumn (151.21 g/m2) >summer (144.77 g/m2) in rock ecotype, and spring (313.36 g/m2) >winter (296.81 g/m2) >summer (238.15 g/m2) >autumn (118.18 g/m2) in piece rocky, gravel and sand ecotype. The sequence of the seasonal biomass of perch density (individual number/m2) is as follows; spring (299.5) >winter (272.0) > qutumn (223.2)>summer (165.7) in rock ecotype, and autumn (610.0) >winter (601.1) >spring (492.7) >summer (293.9) in piece rocky, gravel and sand ecotype. |
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