Effects of insularisation on plant species richness in the prairie-forest ecotone
Effects of insularisation on plant species richness in the prairie-forest ecotone
复制标题
草原-森林交错带岛化对植物物种丰富度的影响
DOI：
10.1016/0006-3207(84)90012-0
复制
发表时间：
1984
影响因子：
5.9
通讯作者：
N. Gotelli
中科院分区：
文献类型：
--
作者：
D. Simberloff;N. Gotelli
对美国中西部草原-森林交错带的五组残存草原和森林的植物资料表明：（1）小生境的群岛比总面积相等的单个大群岛含有更多的物种。(2)没有物种被排除在小网站之外。(3)相对于随机定殖模型，小地点往往有令人惊讶的许多物种，而大地点则令人惊讶地少。(4)“稀有”物种（只在一个地点出现的物种）在小地点发现的频率比随机殖民模型预测的要高。(5)没有任何证据表明这些网站的物种数量是“放松”，但所有这些网站都只剩下很短的时间。结果（1）与对其他类群的类似研究结果一致，并表明没有自动的理由相信物种丰富度是由单个大型避难所最大化的。
Data on plants from five groups of remnant prairies and forests in the prairie-forest ecotone of the midwestern United States show that: (1) Archipelagos of small sites tend to contain more species than do single large ones of equal total area. (2) No species are excluded from small sites. (3) Small sites tend to have surprisingly many species, and large sites surprisingly few, relative to a random colonisation model. (4) ‘Rare’ species (those that occur in only one site) are found more often in small sites than a random colonisation model would predict. (5) There is no evidence for any of these sites that species number is ‘relaxing’, but all these sites have been remnants for only a short time. Result (1) is consistent with results from similar studies on other taxa and suggests that there is no automatic reason to believe that species richness is maximised by single large refuges.