Postingestive selection in the sea scallop, Placopecten magellanicus (Gmelin):: the role of particle size and density
Postingestive selection in the sea scallop, Placopecten magellanicus (Gmelin):: the role of particle size and density
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DOI：
10.1016/s0022-0981(00)00258-6
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发表时间：
2000-10-25
影响因子：
2
通讯作者：
MacDonald, BA
中科院分区：
文献类型：
--
作者：
Brillant, MGS;MacDonald, BA
悬浮进食双壳类在从颗粒清除到产生粪便的不同阶段通过颗粒选择来影响其食物供应的能值。之前的研究人员已经发现，一些双壳类物种(南美甲藻、紫贻贝)能够在胃内进行摄食后的选择。然而，很少有研究试图分离影响进食后选择的因素。在这项研究中，我们检测了海扇贝根据物理特性选择胃内颗粒的能力。扇贝被赠送三种大小的珠子(5，10和20微米)的混合物或不同密度的珠子的混合物(1.05克毫升(-1)和2.5克毫升(-1))。我们证明，麦哲伦螺旋藻可以区分不同大小和密度的颗粒，较大的颗粒(20微米)比较小的颗粒(5微米)保留的时间更长，较轻的颗粒比密度较大的颗粒保留的时间更长。这种拒绝细小、致密颗粒的能力可能会减少试图消化泥沙等劣质颗粒所花费的能量，从而使扇贝受益。本文首次定量分析了在完整的双壳类中颗粒大小和密度对颗粒加工的影响。(C)2000 Elsevier Science B.V.保留所有权利。
Suspension-feeding bivalves can influence the energy value of their food supply by particle selection at various stages from particle clearance to production of feces. Previous workers have found that some bivalve species (Mercenaria mercenaria, Mytilus edulis) are capable of postingestive selection within the stomach. Few studies, however, have attempted to isolate the factors that influence postingestive selection. In this study, we examined the ability of the sea scallop Placopecten magellanicus to select particles within the stomach on the basis of physical properties. Scallops were presented with a mixture of three sizes of beads (5, 10 and 20 mum) or with a mixture of beads of different densities (1.05 g ml(-1) and 2.5 g ml(-1)). We demonstrate that P. magellanicus can distinguish between particles of different sizes and densities, retaining larger particles (20 mum) longer than smaller ones (5 mum) and lighter particles longer than denser ones. This ability to reject small, dense particles may benefit the scallop by reducing the amount of energy expended attempting to digest poor quality particles such as silt. This paper presents the first quantitative analysis of the effect of particle size and density on particle processing within intact bivalves. (C) 2000 Elsevier Science B.V. All rights reserved.