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首页> 外文期刊>Marine ecology >Changing structure of benthic foraminiferal communities: implications from experimentally grown assemblages from coastal Georgia and Florida, USA
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Changing structure of benthic foraminiferal communities: implications from experimentally grown assemblages from coastal Georgia and Florida, USA

机译：底栖有孔虫群落结构的变化：来自美国佐治亚州沿海和佛罗里达州的实验性组合的影响

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摘要

Environmental changes such as ocean warming or sea-level rise have a profound impact on shallow-water coastal environments. Benthic foraminifera have long been successfully used as indicators for ecologic responses. The propagule method is a useful tool to evaluate the reactions of entire assemblages of foraminifera when exposed to different environmental conditions. Here we present results from growth experiments of foraminiferal assemblages from three sites in coastal Georgia and Florida (USA) under different temperatures (18, 24 and 30°C) and salinities (15 and 35). Results show that assemblages grown at the higher temperatures had greater abundances of foraminifera, whereas salinity was the primary factor in shaping the composition of the experimentally grown assemblages from the three sites. We also show that experimentally grown assemblages contain high numbers of ‘exotic’ species that result from successful propagule recruitment from outside of the original environments (e.g. the open shelf). Overall, opportunistic and previously termed ‘pioneer species’ proved to be the most successful constituents of the experimental assemblages, showing that reactions of foraminiferal assemblages to environmental changes can appear remarkably quickly (e.g. in the course of several weeks). Our observations on the faunal reactions to different temperatures and salinities indicate that ongoing environmental alterations of coastal areas will likely result in significant changes in the shallow-water foraminiferal assemblages of the coasts of Georgia and Florida. As such, our study provides general insights into the ecologic effects of current climate change.
机译：海洋变暖或海平面上升等环境变化对浅水沿岸环境产生了深远影响。底栖有孔虫长期以来一直成功地用作生态反应的指标。繁殖方法是评估有孔虫在不同环境条件下整体反应的有用工具。在这里，我们介绍了来自佐治亚州和佛罗里达州（美国）沿海地区三个地点的有孔虫组合在不同温度（18、24和30°C）和盐度（15和35）下的生长实验结果。结果表明，在较高温度下生长的组合物有孔虫的丰度更高，而盐度是影响这三个位置的实验组合物组成的主要因素。我们还显示，实验生长的组合中包含大量的“外来”物种，这些物种是从原始环境（例如开放式架子）外部成功繁殖繁殖体而产生的。总体而言，机会主义和以前被称为“先锋物种”是实验组合最成功的组成部分，表明有孔虫组合对环境变化的反应可以非常迅速地出现（例如，在数周内）。我们对不同温度和盐度的动物反应的观察表明，沿海地区环境的不断变化可能会导致乔治亚州和佛罗里达州海岸的浅水有孔虫群落发生重大变化。因此，我们的研究提供了对当前气候变化的生态影响的一般见解。

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