Ongoing accumulation of plant diversity through habitat connectivity in an 18-year experiment
Ongoing accumulation of plant diversity through habitat connectivity in an 18-year experiment
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DOI：
10.1126/science.aax8992
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发表时间：
2019-09-27
期刊：
影响因子：
56.9
通讯作者：
Tewksbury, Joshua J.
中科院分区：
文献类型：
--
作者：
Damschen, Ellen I.;Brudvig, Lars A.;Tewksbury, Joshua J.
生境破碎化的有害影响和连接碎片的好处可能被大大低估，因为推动生物多样性变化的殖民化和灭绝率的变化可能需要几十年才能积累起来。在一个大的和复制良好的栖息地碎片化实验中，我们发现，239种植物在连接片段的年定殖率高5%，年灭绝率2%，低于在不连接的片段。这导致了多样性的稳定、非渐近增长。经过近20年的时间，连接片段中的物种增加了近14%。我们的研究结果表明，完整的生物多样性价值的连接是远远大于以前估计，不能有效地评估在短时间尺度上，可以最大限度地通过连接栖息地早而不是晚。
Deleterious effects of habitat fragmentation and benefits of connecting fragments could be significantly underestimated because changes in colonization and extinction rates that drive changes in biodiversity can take decades to accrue. In a large and well-replicated habitat fragmentation experiment, we find that annual colonization rates for 239 plant species in connected fragments are 5% higher and annual extinction rates 2% lower than in unconnected fragments. This has resulted in a steady, nonasymptotic increase in diversity. with nearly 14% more species in connected fragments after almost two decades. Our results show that the full biodiversity value of connectivity is much greater than previously estimated, cannot be effectively evaluated at short time scales, and can be maximized by connecting habitat sooner rather than later.