Lima Mauricio, Marquet Pablo A, Jaksic Fabian M
Department de Ecología, Pontificia Universidad Católica de Chile, Casilla 114-D, Santiago, Chile.
Oecologia. 1996 Jul;107(2):197-203. doi: 10.1007/BF00327903.
We report the extinction and colonization rates of five sympatric small mammal species at a semiarid locality in north central Chile. We provide information based on 6 years of monitoring on how colonization and extinction rates change according to landscape features (slope aspect) and on their relationship to populations size, population variability, and body size. We found that: (1) for all species in the assemblage, extinction rates of subpopulations from equatorial-facing slopes were significantly lower than those in polar-facing slopes, (2) population size was the most important factor determining extinction rates, (3) colonization rates did not vary between slopes, and were affected by population size only in equatorial-facing slopes, and (4) most species had higher extinction than colonization rates. Persistence of the metapopulation system for all five small mammal species appears to be fueled by repeated colonization events.
我们报告了智利中北部一个半干旱地区五种同域小型哺乳动物物种的灭绝率和定殖率。我们基于6年的监测提供了相关信息，内容涉及定殖率和灭绝率如何根据景观特征（坡面朝向）变化，以及它们与种群大小、种群变异性和体型的关系。我们发现：（1）对于群落中的所有物种，来自赤道坡面的亚种群灭绝率显著低于极地坡面的亚种群灭绝率；（2）种群大小是决定灭绝率的最重要因素；（3）定殖率在不同坡面之间没有差异，且仅在赤道坡面受种群大小影响；（4）大多数物种的灭绝率高于定殖率。所有五种小型哺乳动物物种的集合种群系统的持久性似乎是由反复的定殖事件推动的。
