Biometry and size distribution of Chrysaora hysoscella (Cnidaria, Scyphozoa) and Aequorea aequorea (Cnidaria, Hydrozoa) off Namibia with some notes on their parasite Hyperia medusarum

被引:38
作者
Buecher, E
Sparks, C
Brierley, A
Boyer, H
Gibbons, M
机构
[1] CNRS, Lab Oceanog Biol & Ecol Plancton Marin, UPMC 7076, Stn Zool, F-06234 Villefranche Sur Mer, France
[2] Cape Technikon, Fac Sci Appl, ZA-8000 Cape Town, South Africa
[3] British Antarctic Survey, Div Biol Sci, Cambridge CB3 0ET, England
[4] Natl Marine Informat & Res Ctr, Swakopmund, Namibia
关键词
D O I
10.1093/plankt/23.10.1073
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Novel data on the biometry, size distribution and parasites of Aequorea aequorea and Chysaora hysoscella are provided from investigations conducted during summer and winter in the northern Benguela ecosystem. The relationship between mass and diameter of C hysoscella did not change on a seasonal basis, and this possibly reflects the aseasonal nature of the food environment. The changes in the size structure of C hysoscella across the shelf and with depth agree with postulated population maintenance strategies in the region. Aequorea aequorea was not strongly parasitized, but C hysoscella was subject to occasional parasitism by Hyperia medusarum, especially in winter when C. hysoscella is thought to reproduce. Parasites were distributed in a typical, negative- binomial manner on their hosts, but load was independent of host size. As medusae increased in diameter so H. medusarum tended to move from other tissues to the gonads.
引用
收藏
页码:1073 / 1080
页数:8
相关论文
共 31 条