Feeding ecology of Rhizophysa eysenhardti, a siphonophore predator of fish larvae1
Feeding ecology of Rhizophysa eysenhardti, a siphonophore predator of fish larvae1
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鱼类幼虫的管水母捕食者艾森哈尔蒂红藻的摄食生态学1
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发表时间：
1981
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通讯作者：
J. Purcell
中科院分区：
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作者：
J. Purcell
对在加州湾手工采集的646个囊体管水母Rhizophysa eysenhardti菌落的胃虫（胃）分析表明，这些标本仅以鱼苗为食。在水华期间，管水母密度在开放水道中平均为0.038 ± 0.004个·m3，在浅海湾中平均为0.91 ± 0.55个·m3。管水母的喂养是更大的海湾，在那里的鱼的幼虫比在通道更丰富，在黎明和黄昏时，在海湾prev更可用。胃虫分析和行为实验表明，管水母只在光照下进食。幼鱼消化所需时间为3-7 h，随猎物大小增加而增加。管水母对食物的吸收效率为72%。估计每只管水母平均每天在海湾内消耗8.8只鱼苗。研究表明，该鱼对幼鱼的捕食作用较强。eysenhardti认为，鱼类死亡率和管水母种群增长可能受到强烈影响。
Analysis of the gastrozooids (stomachs) of 646 colonies of the cystonect siphonophore Rhizophysa eysenhardti collected by hand in the Gulf of California showed that these specimens had fed only on fish larvae. Siphonophore density during bloom conditions averaged 0.038 ± 0.004 individuals · m‒3 in an open-water channel, and 0.91 ± 0.55 in a shallow cove. Siphonophore feeding was greater in the cove where fish larvae were more abundant than in the channel, and during dawn and dusk in the cove when prev were more available. Gastrozooid analysis and behavioral experiments showed that siphonophores fed only in the light. Digestion of fish larvae required 3–7 h, increasing with prey size. Food was assimilated by the siphonophores with 72% efficiency. Each siphonophore was estimated to consume an average of 8.8 fish larvae during a day in the cove. The heavy predation on fish larvae by R. eysenhardti suggests that both fish mortality and siphonophore population growth may be strongly affected.