Wright S Joseph
Biology Department, University of California, 90024, Los Angeles, California, USA.
Oecologia. 1980 Jan;45(3):385-389. doi: 10.1007/BF00540211.
This paper analyzes factors which determine the extent of density compensation on islands; i.e., is the summed population density of all species on an island equal to the summed mainland density? A graphical analysis allows quantitative comparisons of density compensation studies. Two hypotheses which are generally applicable predict the extent of density compensation on islands: (1) Niche theory predicts that summed population densities should be low if island species number is low. (2) The "habitat appropriateness" hypothesis predicts that summed population densities should be low if island populations occupy unfamiliar habitat. Both hypotheses successfully explain variability in the extent of density compensation on islands. Relative to the mainland, summed population densities on islands are high when islands support a large number of species and those species occupy familiar habitats. Summed population densities on islands are low when islands support few species and those species occupy novel habitats.
本文分析了决定岛屿上密度补偿程度的因素；也就是说，一个岛屿上所有物种的总种群密度是否等于大陆上的总密度？通过图形分析可以对密度补偿研究进行定量比较。通常适用的两个假说是预测岛屿上密度补偿程度的：（1）生态位理论预测，如果岛屿物种数量少，总种群密度应该较低。（2）“栖息地适宜性”假说预测，如果岛屿种群占据不熟悉的栖息地，总种群密度应该较低。这两个假说都成功地解释了岛屿上密度补偿程度的变异性。相对于大陆，当岛屿支持大量物种且这些物种占据熟悉的栖息地时，岛屿上的总种群密度较高。当岛屿支持的物种较少且这些物种占据新栖息地时，岛屿上的总种群密度较低。
