Interdependence of food and space limitation of a benthic suspension feeder: consequences for self-thinning relationships
Interdependence of food and space limitation of a benthic suspension feeder: consequences for self-thinning relationships
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底栖悬浮饲养者的食物和空间限制的相互依赖性：自我稀疏关系的后果
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
L. Page
中科院分区：
文献类型：
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作者：
M. Fréchette;A. Aitken;L. Page
我们测试的想法，在底栖悬浮馈线空间和食物的竞争是相互依存的。支持这一概念的实验证据只出现在苔藓虫中。我们提出了一个实验拒绝的假设的独立性的食物和空间的因素限制了个体生长的小群体的蓝贻贝贻贝（L.）。贻贝是在实验室里用天然海水培育的。在本实验中，物理干扰（拥挤）和剥削性的食物竞争没有共同发生。在本实验所用的一系列小室中，贻贝的生长沿着一个假定的食物格拉德由正向负变化。此外，生长受到小个体干扰的严重阻碍，而不是大个体：就大小而言，竞争是不对称的。我们提出了一个模型，这种相互作用的基础上的生物力学分析的影响，减少壳张开在相邻的贻贝相互作用在一起。该模型预测干扰对个体生长的影响与个体大小有关，并可根据壳长/体重关系确定。在预测双壳类自疏斜率的背景下，我们的数据强烈地表明，同时发生的物理干扰和剥削竞争的结果在陡峭的预期斜率（P）的空间有限的自疏关系，当对数生物量（B）表示为对数密度（N）的方程log B = log k + Plog N。
We test the idea that competition for space and food in benthic suspension feeders is interdependent. Experimental evidence in support of this concept has been presented only for bryozoans. We present an experimental rejection of the hypothesis of the independence of food and space as factors limiting individual growth in small groups of blue mussel Mytilus edulis (L.). Mussels were grown in the laboratory, using natural seawater. In the present experiment, physical interference (crowding) and exploitative competition for food did CO-occur. Growth of mussels changed from positive to negative along an assumed food grad~ent in series of the chambers employed in this experiment. In addition, growth was severely impeded by interference In small individuals, but not in large individuals: competition was asymmetrical with respect to size. We present a model of this interaction based on a biomechanical analysis of the effect of reduction of shell gape in neighbouring mussels interacting together. The model predicts that the effect of interference on indiv~dual growth is sizedependent and can be determined In terms of the shell-length/body-mass relat~onship. In the context of predicting self-thinning slopes in bivalves, our data strongly suggest that simultaneous occurrence of physical interference and exploitative competition results in a steepening of the expected slope ( P ) of space-limited self-thinning relationships, when log biomass (B) is expressed as a function of log density ( N ) in the equation log B = log k + Plog N.