Laguna madre: Seagrass changes continue decades after salinity reduction
Laguna madre: Seagrass changes continue decades after salinity reduction
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马德雷湖：盐度降低数十年后海草变化仍在继续
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
C. Onuf
中科院分区：
文献类型：
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作者：
M. Quammen;C. Onuf
根据 1965 年至 1967 年、1974 年至 1976 年和 1988 年进行的调查绘制的马德雷湖下游植被图显示，Halodule wrightii 的覆盖面积减少了 330 平方公里以上，其他海草物种增加了近 190 平方公里，裸露底部增加了 140 平方公里。海草覆盖范围的丧失仅限于拉古纳的较深处；怀疑原因是维护性疏浚造成的浑浊。物种的变化与观察到的最大盐度的降低是一致的。尽管 1948 年至 1965 年间发生了导致盐度状况缓和的水文变化和气候变化，但生物变化仍在继续。在远离源头草甸的地方建立斑块似乎是取代物种的过程，限制了它们在这个细长的海湾中扩展到合适栖息地的速度。
Vegetation maps of the lower Laguna Madre prepared from surveys conducted in 1965–1967, 1974–1976, and 1988 document a >330 km2 decrease in cover byHalodule wrightii, an increase of almost 190 km2 in other seagrass species, and an increase of 140 km2 in bare bottom. Loss in seagrass cover is confined to deeper parts of the laguna; turbidity caused by maintenance dredging is the suspected cause. The species shifts are consistent with observed reductions in salinity maxima. Although the hydrological alterations and climatic shift responsible for moderating the salinity regime occurred between 1948 and 1965, the biological changes continue. Establishment of patches away from source meadows appears to be the process for displacing species that limits their rate of expansion into suitable habitat in this elongate embayment.