- 期刊
Seasonal Distribution of Copepods in Tapong Bay, Southwestern Taiwan
並列摘要
Seasonal distribution of planktonic copepods was investigated at 3 stations, S (southern), C (central), and N (northern), in Tapong Bay, southwestern Taiwan, during the 2-yr period from July 1999 to June 2001. The numerical abundance of small-sized (at 100~330 μm) zooplankton was about 7 times that of the large-sized (at ＞ 330 μm). Calanoid copepods were dominant in both groups, numerically comprising 77.6% and 89.1% of the total, respectively. Other common taxa differed between the 2 groups: cyclopoid copepods, copepod nauplii, and barnacle nauplii were greater in the smallsized group; while cladocerans, ephyrae, and crab zoea were common in the large-sized group. Among the copepods, 35 species were recognized, and 16 taxa were identified to family or genus level; copepodites and nauplii were numerically dominant. The 6 most-common copepod taxa were nauplii; unidentified copepodites of the Paracalanidae, Oithonidae, and Acartiidae; Acartia tsuensis; and Parvocalanus crassirostris. Acartia tsuensis, and P. crassirostris belong to small-sized species and were common in fishponds and coastal waters, respectively. The overall annual mean abundance, species number, and diversity of copepods were consistently higher at stn. N and lower at stn. C. Each station was characterized by different dominant taxa and seasonal distribution patterns. Paracalanidae copepodites and P. crassirostris were common at stn. N and exhibited higher abundances in autumn; copepod nauplii and copepodites of the Oithonidae dominated at stn. C but without significant seasonal changes; while A. tsuensis was the most abundant species at stn. S with a peak abundance in summer. Using cluster analysis, 3 sampling groups and 4 copepod assemblages were defined and are discussed herein. The multiple biotic and abiotic factors, such as food sources, predation pressure from medusae, and the hydrographical complexity, may interactively influence the spatial and seasonal distribution of copepods in the bay.
延伸閱讀
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