Frye Robert J, Rosenzweig Michael L
Department of Ecology and Evolutionary Biology, University of Arizona, 85721, Tucson, USA.
Oecologia. 1980 Dec;47(3):323-327. doi: 10.1007/BF00398524.
Seed distribution (clump size) selection has been proposed as a possible mechanism of resource subdivision for competing heteromyid rodent species. To test this hypothesis, field experiments were conducted over two years during both richer and sparser seasons of the year. None of the predictions derived from the hypothesis were supported by our results. Though some selectivity was displayed by both Dipodomys spectabilis and D. merriami, the patterns of selectivity did not match the expected patterns. Our results further indicate that clump selection may be influenced by variables other than the density of seeds within a clump. These results have led us to conclude that clump size selection is unlikely to play a role in the coexistence of different species of the genus Dipodomys.
种子分布（聚块大小）选择被认为是竞争中的异鼠科啮齿动物物种进行资源细分的一种可能机制。为了验证这一假设，在两年时间里，于一年中资源丰富和稀缺的季节都开展了野外实验。我们的结果并未支持从该假设得出的任何预测。尽管沙漠更格卢鼠和梅氏更格卢鼠都表现出了一定的选择性，但选择性模式与预期模式并不匹配。我们的结果进一步表明，聚块选择可能受到聚块内种子密度以外的其他变量影响。这些结果使我们得出结论，聚块大小选择不太可能在更格卢鼠属不同物种的共存中发挥作用。
