Early Stages of Sea-Level Rise Lead To Decreased Salt Marsh Plant Diversity through Stronger Competition in Mediterranean-Climate Marshes.
Early Stages of Sea-Level Rise Lead To Decreased Salt Marsh Plant Diversity through Stronger Competition in Mediterranean-Climate Marshes.
复制标题
海平面上升的早期阶段导致盐沼植物的多样性减少，通过在地中海气候沼泽中进行更激烈的竞争。
DOI：
10.1371/journal.pone.0169056
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Shurin JB
中科院分区：
文献类型：
--
作者：
Noto AE;Shurin JB
气候变化改变了物种范围，并创造了新的相互作用，可能会缓冲群落免受气候变化的影响，也可能加剧气候变化的影响。例如，在有压力的条件下，促进作用在盐沼中可能变得更加普遍，而在有利的环境中，竞争会更加激烈。海平面上升(SLR)是气候变化的结果，气候变化影响了洪水和盐碱度造成的压力分布。为了确定地中海气候沼泽中这两个应激源的变化如何影响SLR早期的相互作用，我们将沼泽草坪移植到较低的海拔处，以模拟SLR和操纵优势植物物种太平洋盐角草(以前称为Salicornia virgiica)的盖度。研究发现，淹水处理对太平洋螺旋藻及其附属种均有影响，在低海拔地区，有太平洋螺旋藻存在时，附属物种的盖度和多样性都比去除时低。这些结果表明，太平洋螺旋藻对其他植物的竞争效应在较低的潮汐海拔处较强，我们还发现那里的盐度降低。随着海平面的上升，优势植物的竞争加剧可能会减少从属物种的多样性和盖度，这表明更强的物种相互作用将加剧气候变化对植物群落的影响。
Climate change shuffles species ranges and creates novel interactions that may either buffer communities against climate change or exacerbate its effect. For instance, facilitation can become more prevalent in salt marshes under stressful conditions while competition is stronger in benign environments. Sea-level rise (SLR) is a consequence of climate change that affects the distribution of stress from inundation and salinity. To determine how interactions early in SLR are affected by changes in these two stressors in Mediterranean-climate marshes, we transplanted marsh turfs to lower elevations to simulate SLR and manipulated cover of the dominant plant species, Salicornia pacifica (formerly Salicornia virginica). We found that both S. pacifica and the subordinate species were affected by inundation treatments, and that subordinate species cover and diversity were lower at low elevations in the presence of S. pacifica than when it was removed. These results suggest that the competitive effect of S. pacifica on other plants is stronger at lower tidal elevations where we also found that salinity is reduced. As sea levels rise, stronger competition by the dominant plant will likely reduce diversity and cover of subordinate species, suggesting that stronger species interactions will exacerbate the effects of climate change on the plant community.