LAND BIRDS ON NORTHERN ISLANDS - A SAMPLING METAPHOR FOR INSULAR COLONIZATION
LAND BIRDS ON NORTHERN ISLANDS - A SAMPLING METAPHOR FOR INSULAR COLONIZATION
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DOI：
10.2307/3544092
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发表时间：
1983-01-01
期刊：
影响因子：
3.4
通讯作者：
HAILA, Y
中科院分区：
文献类型：
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作者：
HAILA, Y
在芬兰西南部奥兰群岛的44个岛屿（面积范围0.5-582公顷）上进行了2个（或3个）繁殖季节的陆地鸟类普查。根据生境组成定义的7个岛型群数据中的物种丰度关系，通过稀疏和Fisher对数序列模型的拟合评估，显示出统计学上显著的差异。在每个组内，无论样本量大小，分布都是相似的。假设岛屿定殖是泊松过程，阐述了岛屿定殖的抽样隐喻。每个物种的预期平均种群大小由物种的平均区域丰度和任何给定岛屿的采样效率决定。生境组成是采样效率的重要决定因素。在每个岛型群中，无论样本量是在时间上还是在空间上增加，对S[物种数量]的增加都无关紧要。这强调了实际定殖事件的随机性，并警告不要在没有种群数量数据的情况下就不同物种的更替倾向作出结论；数量较少的物种预计会频繁更替。将随机放置模型的期望值与观测值进行了比较。该模型与岛型群体内部的数据一致，但与岛型群体之间的数据不一致。这些模式表明，每种岛屿类型都是从其自身的鸟类动物宇宙中取样繁殖对，栖息地组成是实际殖民者池的重要决定因素。S和A[生态空间]之间的关系是间接的，由一系列相互关联的因素介导，包括栖息地组成、物种特异性定殖概率差异和物种丰度关系。单独的S和A是殖民化过程中生态有趣特征的不完美特征，不应过多关注它们的相互相关性。
Land birds were censused on 44 islands (size range 0.5-582 ha) in the archipelago of Aland, southwest Finland, in 2 (or 3) breeding seasons. Species-abundance relations in the data of the 7 island type groups, defined on the basis of habitat composition, show statistically significant deviations from each other as assessed by rarefaction and by fitting Fisher''s logseries model to the data. Within each group the distributions were similar irrespective of sample size. A sampling metaphor for insular colonization is elaborated assuming that colonization is a Poisson process. The expected mean population size of each species is determined by average regional abundance of the species and sampling efficiency of any given island. Habitat composition is an important determinant of sampling efficiency. Within each island type group it is immaterial for the increase of S [species numbers] whether sample size is increased in time or in space. This emphasizes the stochastic nature of actual colonization events and warns against making conclusions concerning turnover proneness of different species without data on population numbers; less abundant species are expected to turn over frequently. Expectations of the random placement model were compared with the observations. The model was in agreement with data within, but not between island type groups. These patterns indicate that each island type is sampling breeding pairs from an avifaunal universe of its own and habitat composition is an important determinant of the pool of actual colonists. The relation between S and A [ecological space] is indirect and is mediated by a chain of interrelated factors that comprise habitat composition, differences in species-specific colonization probabilities and species-abundance relations. S and A alone are imperfect characteristics of the ecologically interesting features of the colonization process and not too much attention should be paid to their mutual correlations.