In the wake of a major hurricane: Differential effects on early vs. late successional seagrass species
In the wake of a major hurricane: Differential effects on early vs. late successional seagrass species
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DOI：
10.1002/lol2.10112
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发表时间：
2019-10-01
影响因子：
7.8
通讯作者：
Dunton, Kenneth H.
中科院分区：
文献类型：
--
作者：
Congdon, Victoria M.;Bonsell, Christina;Dunton, Kenneth H.
在过去的50年里，至少有18场大风暴袭击了墨西哥湾和加勒比海地区，其中包括飓风哈维，这是一场4级风暴，经过了墨西哥湾西部广阔的海草床，成为美国第二昂贵的飓风。我们试图确定一个极端的飓风对沉积物的物理化学特性和海草物种的影响与对比的生活史和形态。令人惊讶的是，哈维的强烈风速导致叶片长度减少，植被覆盖减少，以及与多产的先锋物种Halopalus相比，持续的顶极物种Thalassia的整体损失更大。沉积物铵态氮和粒度发生了变化，但有机碳没有发生变化。结果表明，风强度的影响不仅限于对海草的差异影响，而且对沉积物的物理化学特征也有影响。这些变化，再加上缓慢的定殖能力的海兰，可能会延长恢复受干扰的海草草甸。
At least 18 major storms have struck the Gulf of Mexico and Caribbean in the past 50 yr including Hurricane Harvey, a Category 4 storm that passed over extensive seagrass beds in the western Gulf of Mexico and became the second-most expensive U.S. hurricane. We sought to identify the effects of an extreme hurricane on sediment physicochemical characteristics and seagrass species with contrasting life histories and morphologies. Surprisingly, Harvey's intense wind speeds resulted in decreases in blade length, vegetative cover, and greater overall loss of Thalassia, a persistent climax species relative to Halodule, a prolific pioneer species. Sediment ammonium and grain size changed, but not organic carbon. Our results indicate that effects of wind intensity are not only restricted to the differential impacts on seagrasses, but on the physicochemical characteristics of the sediments. These changes, coupled with the slow colonization abilities of Thalassia, may prolong recovery of disturbed seagrass meadows.