Experimental warming causes rapid loss of plant diversity in New England salt marshes
Experimental warming causes rapid loss of plant diversity in New England salt marshes
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DOI：
10.1111/j.1461-0248.2009.01337.x
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发表时间：
2009-08-01
期刊：
影响因子：
8.8
通讯作者：
Bertness, Mark D.
中科院分区：
文献类型：
--
作者：
Gedan, Keryn B.;Bertness, Mark D.
由于物种分布的变化，预计人为气候变化将导致广泛的生物多样性丧失，但这些预测很少纳入生态关联，如地带化。在这里，我们基于一项生态系统变暖实验，预测了中纬度盐沼植物多样化组合的衰落。在新英格兰盐沼，一群盐生杂草占据着充满压力、浸水的沼泽。在三个地点，4摄氏度的试验性变暖导致围裙多样性下降，并迅速被竞争优势的斯巴达帕坦斯接管。在罗德岛州，靠近其南部范围的界限，针叶比更北的地方对变暖更敏感，在三个季节的实验中，对照地块的针叶面积也有所下降。这些结果表明，气候变暖将通过消除高多样性地带，迅速减少新英格兰盐沼的植物多样性。分区生态系统中的生物多样性可能更多地受到气候驱动的分区变化的影响，而不是单个物种的分布变化。
Anthropogenic climate change is predicted to cause widespread biodiversity loss due to shifts in species' distributions, but these predictions rarely incorporate ecological associations such as zonation. Here, we predict the decline of a diverse assemblage of mid-latitude salt marsh plants, based on an ecosystem warming experiment. In New England salt marshes, a guild of halophytic forbs occupies stressful, waterlogged pannes. At three sites, experimental warming of < 4 degrees C led to diversity declines in pannes and rapid takeover by a competitive dominant, Spartina patens. In Rhode Island, near their southern range limit, pannes were more sensitive to warming than farther north, and panne area also declined in control plots over the three-season experiment. These results suggest that warming will rapidly reduce plant diversity in New England salt marshes by eliminating a high diversity zone. Biodiversity in zoned ecosystems may be more affected by climate-driven shifts in zonation than by individual species' distribution shifts.