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Vol. 47 No. 3, 2008
Spatial and Seasonal Variations in Chaetognath Assemblages in
Two Subtropical Marine Inlets with Different Hydrographical
Characteristics
Pan
Tse1, Sami Souissi2, Jiang-Shiou Hwang3,
Qing-Chao Chen4, and Chong Kim Wong1,*
1Department
of Biology, The Chinese University of Hong Kong, Shatin, Hong Kong,
China
2Universite Des Sciences Et Technologies De
Lille-Lille 1. Cnrs-Fre 2816 Elico, Station Marine, 28 Avenue Foch,
62930 Wimereux, France
3Institute of Marine Biology, National Taiwan Ocean
University, Keelung 202, Taiwan
4South China Sea Institute of Oceanology, No. 164,
Xingangxi Rd., Haizhu District, Guangzhou 510301, China
Pan Tse,
Sami Souissi, Jiang-Shiou Hwang, Qing-Chao Chen, and Chong Kim Wong
(2008) The seasonal and spatial occurrences of Chaetognatha were
studied in 2 subtropical marine inlets with different hydrographical
characteristics. Tolo Harbour and Mirs Bay are marine bays in the
northeastern corner of Hong Kong. Tolo Harbour is a semi-enclosed
bay with poor water circulation. It opens into Mirs Bay which is
fully exposed to water currents from the South China Sea.
Chaetognath species were grouped by hierarchical classification of
samples using the BrayCurtis similarity coefficient and a clustering
strategy with flexible links. Indicator species for each group
were used to characterize species assemblages. Indigenous
species, including Flaccisagitta enflata, Aidanosagitta neglecta, A. delicata, A. nagae, A. crassa, A. johorensis, and A. regularis, occurred in the
entire study area, but their densities were higher in Tolo
Harbour. Non-indigenous species, including A. bedfordii, Krohnitta pacifica, Pterosagitta draco, Decipisagitta decipiens, Ferosagitta ferox, Fer. robusta, Fer. tokiokai, Mesosagitta minima, Sagitta bipunctata, Serratosagitta pacifica, Zonosagitta bedoti, Z. bruuni, and Z. pulchra were carried into Mirs
Bay by ocean currents from the South China Sea and were rarely found in
Tolo Harbour.
Key words: Chaetognaths, Spatial-seasonal
distribution, Subtropical marine inlet, Indicator species.
*Correspondence: Fax: 852-26035391.
E-mail:chongkimwong@cuhk.edu.hk
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