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原文連結
論文資訊
- 類型：已發表論文
- 日期：1998
摘要
族群 biologists have long been interested in the variability of natural 族群s(1-6). One approach to dealing with ecological complexity is to reduce the system to one or a few 物種, for which meaningful equations can be solved Here we explore an alternative approach(7,8) by studying the 統計 properties of a data set containing over 600 物種, namely the North American breeding bird survey(9). The survey has recorded annual 物種 abundances over a 31-year period along more than 3,000 observation routes(10). We now analyse the dynamics of 族群 variability using this data set, and find 縮放律 features in common with inanimate systems composed of strongly interacting subunits(11). Specifically, we find that the distribution of changes in 族群 abundance over a one-year interval iis remarkably symmetrical, with long
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