Species composition and abundance distribution of chaetognaths in the upper waters around the Nansha Islands

LIN Qiang; YIN Jian-qiang; HUANG Liang-min; ZHANG Gu-xian; LI Kai-zhi

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LIN Qiang, YIN Jian-qiang, HUANG Liang-min, ZHANG Gu-xian, LI Kai-zhi. Species composition and abundance distribution of chaetognaths in the upper waters around the Nansha Islands[J]. Haiyang Xuebao, 2010, 32(5): 100-109.

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Species composition and abundance distribution of chaetognaths in the upper waters around the Nansha Islands

1.
Key Laboratory of Marine-bioresources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Graduate School, Chinese Academy of Science, Beijing 100039, China
2.
Key Laboratory of Marine-bioresources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2010-01-12

Abstract

Abstract

Species composition and abundance distribution of chaetognaths were studied based on the data obtained from three separate cruises carried out in November 1997, April and July 1999 around the Nansha Islands. A total of 18 species were identified and the number of species did not show obvious seasonal variation.The abundance of chaetognaths ranged from 1.60 to 16.40 ind/m³ with the average of (6.86±3.08) ind/m³ in autumn,(9.95±3.50)ind/m³ in spring and (7.11±3.34)ind/m³ in summer. Flaccisagitta enflata dominanted, Pterosagitta draco and Serratosagitta pacifica followed during three seasons.Chaetognaths could be classified into three ecological groups, i.e.,the widespread warm-water species, the oceanic warm-water species and the nearshore warm-water species, in which the first two groups played a decisive role in the quantity distribution of chaetognaths. The seasonal distributions of chaetognaths were related to the southern South China Sea circulation driven by East Asian monsoon. During NE monsoon in autumn, the distribution of chaetognaths density showed decreasing tendency from the west to the east, and the high value spots were at oceanic fronts in southwestern survey area. In summer, the high density of chaetognaths was found in the northwest, where the upwelling and the oceanic fronts were induced by SW monsoon.
- chaetognaths,
- composition,
- abundance,
- monsoon,
- Nansha Islands

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References(31)

References

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