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- W2364253286 abstract "Bullacta exarata (Philippi,1848) is a favorite seafood and a tidal and economic seashell with high nutrition and edible value in South China. It can be found in the intertidal flats in China,Japan and Korean along the coasts of West Pacific Ocean. B.exarata was one important biological resource which played an important role in the food chain of the tidal flat ecosystem as a consumer. Since late 1990s,the population ecology and toxicology of B.exarata had been partly studied along the coasts in Zhejiang,China,however,the spatial distribution had never been analyzed. Moreover, B.exarata had never been reported again up to now in the Yangtze River Estuary although it was first recorded formally in late 1980s. B.exarata population in the Nanhui tidal flat and North Chongming Island in the Yangtze River Estuary had been investigated and analyzed by Taylor' power law,Iwao's patch regression and Morisita index from May to June,2000. The results indicated that the B.exarata population distributed widely between the supratidal zone and subtidal zone of the intertidal flats from south Chaoyang Farm to Luchao Port in Nanhui tidal flat and in North Hangzhou Bay,from Niupenggang Port to Puyu Port in North Chongming Island,in North Changxing Island,Mid and sub Kiuduansha shoal in the Yangtze River Estuary. It was shown that the natural B.exarata population distributed extensively with clumped and negative binomial distribution [Morisita index ( I )=2 61, P 0 01] theoretically. The regression equations of Taylor power law and Iwao's patch regression were ln S 2=-0 7472+1 3484 ln (r 2=0 8132, P 0 01, n =8) and =-1 005+1 0766 (r 2=0 9936, P 0 01, n =8) respectively. The population densities at 8 sample sites in the Yangtze River Estuary (D7D6CPBDZBCYNDZNCNBCP) were greatly different significantly by the analysis of variance [ANOVA, F =42 52 F 0 01(7,32) =3 26, P 0 01],which were resulted obviously from human activities,including land reclamation of tidal flats and environmental pollution,and different natural conditions between island and tidal flats." @default.
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- W2364253286 date "2001-01-01" @default.
- W2364253286 modified "2023-09-25" @default.
- W2364253286 title "Analysis on the Spatial Distribution of Bullacta exarata (Mollusca: Gastropoda:Atyidae) Population in Yangtze River Estuary,China" @default.
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