IBB-Institute for Biotechnology and Bioengineering, Center for Biological and Chemical Engineering, Instituto Superior Técnico (IST), Lisbon 1049-001, Portugal; Departamento de Ecoloxía e Bioloxía Animal, Universidade de Vigo, Vigo E-36310, Spain.
Mar Environ Res. 2013 Dec;92:1-9. doi: 10.1016/j.marenvres.2013.07.002. Epub 2013 Aug 8.
A field experiment was carried out to test the effect of pore water salinity on the macrobenthic assemblages in an estuarine region of the Tagus estuary (Portugal) subjected to wide fluctuations in salinity. The conditions at the experimental site ranged from freshwater (minimum salinity 0.2) to mesohaline (maximum salinity 15.3). The experimental site was affected by an unexpected deposition of fluid mud during summer. Redundancy Analysis discriminated the experimental treatments along the first canonical ordination axis. The analysis also revealed an experimental gradient of increasing environmental stress, in which the minimal presence of organisms corresponded to treatments representing a high level of environmental stress. Sediment dynamics and saline fluctuations were the major factors that, together, determined the low macrofaunal abundance and species diversity at the experimental site. The most abundant macrofaunal species in this harsh environment were the polychaetes Hediste diversicolor and Streblospio shrubsolii.
开展了一项野外实验，以测试孔隙水盐度对塔古斯河口（葡萄牙）河口区大型底栖生物群落的影响，该地区盐度波动较大。实验地点的条件范围从淡水（最小盐度 0.2）到半咸水（最大盐度 15.3）。实验地点在夏季受到意外的流体淤泥沉积的影响。冗余分析沿第一典范排序轴区分了实验处理。该分析还揭示了一个实验环境胁迫梯度，其中生物体的最小存在对应于代表高环境胁迫水平的处理。沉积物动态和盐度波动是决定实验地点大型底栖动物丰度和物种多样性低的主要因素。在这个恶劣的环境中，最丰富的多毛类动物是多毛类 Hediste diversicolor 和 Streblospio shrubsolii。
