Breaching biogeographic barriers: the invasion of Haynesina germanica (Foraminifera, Protista) in the Bahia Blanca estuary, Argentina
Breaching biogeographic barriers: the invasion of Haynesina germanica (Foraminifera, Protista) in the Bahia Blanca estuary, Argentina
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DOI：
10.1007/s10530-010-9723-x
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发表时间：
2010-09-01
影响因子：
2.9
通讯作者：
Langer, Martin R.
中科院分区：
文献类型：
--
作者：
Calvo-Marcilese, Lydia;Langer, Martin R.
首次从阿根廷巴伊亚布兰卡河口的沼泽和潮间带泥滩沉积物中报道了大量的底栖有孔虫--德国海绵有孔虫(Ehrenberg，1840)。在浅水潮间带环境中记录到的活体标本最多。该物种以前在欧洲和北美的许多浅水沿海环境中被记录，但在阿根廷没有记录。对巴伊亚布兰卡河口内年代较早的岩心样品进行的比较动物群组合分析表明，该物种至少在过去8,200年内没有出现过。这支持了一种假设，即该物种可能是由于压载水和/或航运活动而意外引入其自然范围以外的。这项研究是关于非本土底栖有孔虫成功入侵阿根廷南大西洋海岸的第一份报告。非本地有孔虫物种的引入提供了新的证据，表明人类中介的生物地理屏障的突破，最终将导致有孔虫潮间带动物群组合的生物均质化。
Large populations of the living benthic foraminifera Haynesina germanica (Ehrenberg 1840) are reported for the first time from marsh and intertidal mud flat sediments of the Bahia Blanca estuary (Argentina). Maximum abundance of living specimens was recorded in shallow intertidal environments. The species was previously recorded from many European and North American shallow-water coastal settings, but has not been documented from Argentina. Comparative faunal assemblage analysis from dated core sample material from within the Bahia Blanca estuary shows that the species has not been present for at least the last 8,200 years. This supports the hypothesis that the species has been accidentally introduced outside its natural range as a probable result of ballast water and/or shipping activities. This study is the first report of a successful invasion of non-indigenous benthic foraminifera to the South Atlantic coast of Argentina. The introduction of nonnative foraminiferal species provides new evidence that human-mediated breaching of biogeographic barriers, will ultimately result in the biotic homogenization of foraminiferal intertidal faunal assemblages.