Abrams P A
Department of Ecology and Behavioral Biology, University of Minnesota, 318 Church St. SE, 55455, Minneapolis, MN, USA.
Oecologia. 1987 May;72(2):248-258. doi: 10.1007/BF00379275.
Resource partitioning was quantified for 6 species of intertidal hermit crabs in the genus Pagurus, that occur on the outer coast of Washington. This, together with field evidence of shell shortage and with laboratory experiments to quantify the mechanism of interactions for shells, allowed estimation of the relative intensities of inter-and intraspecific competition between these species. The findings were that: (1) the magnitude of intraspecific competition was greater than any single interspecific competitive effect for all of the species; and (2) the relative proportion of intraspecific competition was greater for the middle and upper intertidal species than for the lower intertidal species. Studies at several outer coast sites supported these generalizations. Both of these findings are consistent with the hypothesis that competitive divergence has occurred in the past. The structure of the outer coast hermit crab assemblage is compared with that of the San Juan Archipelago hermit crab assemblage. Differences between the two do not seem to be the result of adaptive responses to the presence of more competing species in the former group.
对生活在华盛顿州外海岸的6种滨蟹属潮间带寄居蟹的资源分配进行了量化。这一点，连同贝壳短缺的实地证据以及量化贝壳相互作用机制的实验室实验，使得能够估计这些物种之间种间和种内竞争的相对强度。研究结果如下：（1）对于所有物种而言，种内竞争的强度大于任何单一的种间竞争效应；（2）潮间带中上部物种的种内竞争相对比例高于潮间带下部物种。在几个外海岸地点进行的研究支持了这些概括。这两个发现都与过去发生竞争分化的假设一致。将外海岸寄居蟹群落的结构与圣胡安群岛寄居蟹群落的结构进行了比较。两者之间的差异似乎并不是对前一组中存在更多竞争物种的适应性反应的结果。
