Distribution of nekton stock density and its community structure in Taiwan Strait in Summer and Autumn

Abstract

Abstract: This research was conducted based on the bottom trawl surveys in Summer and Autumn.An analysis on the stock density and community structure of nekton in Taiwan Straits indicated that the average stock density was 8.50 kg穐^-1 in Summer and 6.94 kg穐^-1 in Autumn.The species number was 80 in Summer and 91 in Autumn,and the abundance,species diversity index,and evenness index were all higher in Autumn than in Summer.The average species diversity index was 2.0466 in Summer and 2.3964 in Autumn.The dominant species whose index of relatively importance (IRI) was >200 were hairtail (Trichiurus japonicus),lanternbelly (Acropoma japonicum),red bigeye (Priacanthus macracanthus),large-scale lizardfish (Saurida undosquamis) and common Chinese squid (Loligo chinensis) in Summer,and hairtail (Trichiurus japonicus),skinnycheek lanternfish (Benthosema pterotum),wart perch (Psenopsis anomala),squid (Loligo chinensis),white-tipped mackerel scad (Decapterus maruaelsi) and deep pugnose ponyfish (Secuter ruconius) in Autumn.As a whole,the aggregated intensity of dominant species in Summer was higher than that in Autumn.

Key words: Stock density indices, Community structure, Species diversity, Nekton, Taiwan Strait

CLC Number:

S931.5

LIN Longshan, ZHENG Yuanjia, MA Chunyan . Distribution of nekton stock density and its community structure in Taiwan Strait in Summer and Autumn[J]. Chinese Journal of Applied Ecology, 2005, 16(10): 1948-1951.

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