Temporal persistence in the vertical structure of the assemblage of planktonic medusae in the NW Mediterranean Sea

被引:22
作者
Buecher, E
Gibbons, MJ
机构
[1] UPMC, CNRS, Lab Oceanog Biol & Ecol Plancton Marin, Stn Zool, F-06234 Villefranche Sur Mer, France
[2] Univ Western Cape, Dept Zool, ZA-7535 Bellville, South Africa
关键词
medusae; vertical distribution; seasonality; Mediterranean Sea; assemblage structure;
D O I
10.3354/meps189105
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The seasonal occurrence and Vertical distribution of planktonic cnidarians (hydromedusae and scyphomedusae) were investigated over a 2 yr period in the Bay of Villefranche-sur-Mer. A total of 37 species were recorded, of which the meroplanktonic species were more specific and the holoplanktonic species were more abundant. The results suggest that although medusae were ever-present in the bay, the assemblage changed through time. These changes reflected species-specific responses to the environment and were linked to the thermal structure of the water column: the meroplanktonic species were most common during eutrophic periods of the year while the holoplanktonic species were present throughout the year. The dominant species of medusae partitioned Vertical space and each occupied a characteristic depth. This segregation in the vertical dimension was maintained in the different seasons despite the fact that the exact species changed. It is suggested that the strong degree of structure to the medusoid assemblage in the Bay of Villefranche-sur-Mer might reflect the stability and age of the Mediterranean ecosystem.
引用
收藏
页码:105 / 115
页数:11
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