Laboratory study of predation by Aurelia aurita on larvae of cod, flounder, plaice and herring: development and vulnerability to capture
Laboratory study of predation by Aurelia aurita on larvae of cod, flounder, plaice and herring: development and vulnerability to capture
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DOI：
10.1007/bf00397461
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发表时间：
1984-11
期刊：
影响因子：
2.4
通讯作者：
K. Bailey;R. Batty
中科院分区：
文献类型：
--
作者：
K. Bailey;R. Batty
测定了水母Aurelia auritapreying在不同发育阶段的捕获成功率，以及幼虫被蜇后的反应性和逃逸速度。这些实验是在1983年春用A.从苏格兰的洛赫湖采集的auritamedusae和实验室饲养的Gadus morhuaL.，Platichthys flesusL.，平叶侧耳和鲱鱼（Clupea harengus L.）捕获成功的水母增加与水母的大小，但减少与推进幼虫的发展。较小种类的幼虫更容易被捕获。幼虫的反应，以满足与水母增加与推进发展，更大的种类的幼虫更反应的遭遇。幼虫逃逸游泳速度也随着幼虫发育和大小的增加而增加。这些结果表明，早期阶段的幼虫在一个物种和较小的物种的幼虫在一个给定的阶段更容易被水母捕食，因为他们是不太反应的遭遇。显然他们更容易受到神经毒素的影响。鲱鱼幼虫的不同发育阶段的捕食率记录和捕食模型预测率进行比较。预测落在所观察到的捕食率的范围内，但往往高估率较大的水母进食较大的鲱鱼幼虫。这表明捕食者饱食和/或行为回避的可能性。
Capture success of the medusaAurelia auritapreying on various developmental stages of fish larvae was measured together with larval reactivity and escape speed after being stung. These experiments were conducted in the spring of 1983 withA. auritamedusae collected from Loch Etive, Scotland and laboratory-reared larvae ofGadus morhuaL.,Platichthys flesusL.,Pleuronectes platessaL. andClupea harengusL. Capture success of the medusae increased with medusa size, but decreased with advancing larval development. Smaller species of larvae were more vulnerable to capture. Larval reactivity to encounters with medusae increased with advancing development, and larger species of larvae were more reactive to encounters. Larval escape swimming speeds also increased with advancing larval development and size. These results indicate that earlier stages of larvae within a species and smaller species of larvae at a given stage are more vulnerable to predation by medusae since they are less reactive to encounters. Apparently they are more susceptible to the effects of neurotoxins. Predation rates on different developmental stages of herring larvae are documented and compared with rates predicted by a predation model. Predictions fell within the range of observed predation rates, but tended to overestimate rates by larger medusae feeding on larger herring larvae. This indicates the possibility of predator satiation and/or behavioural avoidance.