Julliard Romain, Clavel Joanne, Devictor Vincent, Jiguet Frédéric, Couvet Denis
Ecol Lett. 2006 Nov;9(11):1237-44. doi: 10.1111/j.1461-0248.2006.00977.x.
Each species generally has a close relationship with one or more habitats and can therefore be classified as either specialist or generalist. We studied whether specialist and generalist species are spatially distributed independently of each other. Repeating the analysis for 100 of the most frequent terrestrial bird species recorded over the 10 000 sampled sites of the French Breeding Bird survey, we found that specialists were more abundant if the rest of the community was specialized, and that the inverse was also true. This pattern was far subtler than just a simple dichotomy: most species actually presented a maximum abundance at a value of community specialization similar to their own level of specialization. Bird communities appear very well defined along a specialist-generalist gradient. We believe this pattern becomes more apparent with habitat degradation. The consequences on both ecological services and community resilience may well be considerable.
每个物种通常与一个或多个栖息地有着密切关系，因此可被归类为 specialists 或 generalists。我们研究了 specialists 物种和 generalists 物种在空间上的分布是否相互独立。在法国繁殖鸟类调查的 10000 个采样点记录的 100 种最常见的陆地鸟类中重复进行分析，我们发现，如果群落的其他部分是 specialists，那么 specialists 的数量就会更多，反之亦然。这种模式远比简单的二分法微妙得多：大多数物种实际上在与自身专业化水平相似的群落专业化值处呈现出最大丰度。鸟类群落沿着 specialists - generalists 梯度显得非常明确。我们认为，随着栖息地退化，这种模式会变得更加明显。对生态系统服务和群落恢复力的影响可能相当大。
