TIME PARTITIONING OF FORAGING IN THE LIMPET PATELLA-VULGATA
TIME PARTITIONING OF FORAGING IN THE LIMPET PATELLA-VULGATA
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DOI：
10.2307/5298
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发表时间：
1991-06-01
影响因子：
4.8
通讯作者：
WILLIAMS, GA
中科院分区：
文献类型：
--
作者：
EVANS, MR;WILLIAMS, GA
(1)帽贝的行为生态学研究一种常见的放牧潮间带软体动物，在爱尔兰西南部的海恩湖进行了调查。在帽贝觅食以前已被证明是一个简单的三阶段系统：一个向外旅行阶段，激烈的觅食的中间阶段，和一段时间的返回旅行到永久的家疤痕。(2)建立了一个预测模型，并考虑以下策略作为帽贝觅食的控制因素：（i）在觅食时，帽贝最大限度地提高其净能量增益;（ii）在觅食时，帽贝最小化其能量成本;（iii）在觅食时，帽贝最小化离开家疤痕的时间。从现场收集的数据提供的形态和行为参数，并从各种文献来源的模型中使用的能量参数。(3)帽贝似乎不觅食，以最大限度地提高其净能量增益，这可能是由于可预测的觅食期帽贝。成本最小化的策略也提供了观察到的时间预算的穷人估计，这可能是因为动物需要的躯体和性腺组织的生长能量。然而，在觅食的帽贝旅行和激烈的觅食之间的时间划分，可以解释的战略（三），时间最小化。(4)可能的环境限制，可能会影响帽贝觅食行程，以及这些如何随着高度的增加而变化的海岸进行了讨论。此外，还讨论了“喂养”之旅的可能性，保持藻类生物膜在一个高产阶段。帽贝的觅食行为在不列颠群岛的不同地点之间存在差异，有人认为这可能是由于捕食和干燥风险的不同组合。
(1) The behavioural ecology of the limpet, Patella vulgata L., a common grazing intertidal mollusc, was investigated at Lough Hyne in south-west Ireland. Foraging in limpets has previously been shown to be a simple three-phase system: an outward travelling phase, a middle phase of intense foraging, and a period of return travel to the permanent home scar.(2) A predictive model was developed and considered the following strategies as the controlling factors for limpet foraging: (i) while foraging, limpets maximize their net energy gain; (ii) while foraging, limpets minimize their energy costs; (iii) while foraging, limpets minimize the time spent away from the home scar. Data were collected from the field to provide the morphological and behavioural parameters, and from various literature sources for the energetic parameters used in the model.(3) Limpets do not appear to forage so as to maximize their net energy gain; this is probably due to the predictability of foraging periods for limpets. The strategy of cost minimization also provided poor estimates for the time budgets observed; probably this is because the animals require energy for growth of the somatic and gonadal tissues. The partitioning of time between travelling and intense foraging by a limpet while foraging can, however, be explained in terms of strategy (iii), that of time minimization.(4) The possible environmental constraints which could influence limpet foraging trips and how these change with increasing height up the shore are discussed. The possibility that the 'feeding' trips may, in addition, maintain the algal biofilm in a highly productive phase is also discussed. The foraging behaviour of limpets varies between different sites around the British Isles, and it is suggested that this may be due to varying combinations of predation and desiccation risks.