Taxonomic sufficiency for soft-bottom sublittoral mollusks assemblages in a tropical estuary, Guanabara Bay, Southeast Brazil.
Taxonomic sufficiency for soft-bottom sublittoral mollusks assemblages in a tropical estuary, Guanabara Bay, Southeast Brazil.
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DOI：
10.1016/j.marpolbul.2006.08.026
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发表时间：
2007-04
影响因子：
5.8
通讯作者：
C. L. T. Mendes;M. Tavares;A. Soares-Gomes
中科院分区：
文献类型：
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作者：
C. L. T. Mendes;M. Tavares;A. Soares-Gomes
瓜纳巴拉湾（GB）被认为是巴西南部海岸线污染最严重的环境之一。这个典型的河口系统受到里约热内卢大都市区工业和生活垃圾大量排放的影响。2000 ~ 2001年，采用3个月的抽样设计，按南方季节对38个站位的软体动物群落结构和分布进行了调查。物种丰富度逐渐聚合到更高的分类单元矩阵（属，科，目），并使用多变量技术进行了分析。GB中的软体动物分布在空间和时间上变化显着，可能是由缺氧和改变氧化还原条件加上流行的循环模式的有机富集效应。在GB的部门内的软体动物的多样性和发生率的增加梯度观察，从azoic和贫穷的站在内部部门的一个结构良好的社区的物种组成和丰富的栖息在外部部门。非度量多维标度（nMDS）和聚类分析结果表明，当种被划分为属和科时，结果相似，而在较粗的分类鉴定（目）上，结果差异较大。有关分类充分性的文献表明，随着污染的增加，不同分类层次的区系格局趋于相似。在瓜纳巴拉湾，仅在家庭一级进行的分析是完全足够的描述生理生态压力。进一步聚合到订单水平改变了感知的差异模式。然而，不同的分类分辨率可以选择取决于类型的生态模式的调查。
Guanabara Bay (GB) is considered to be one of the most polluted environments of the southern Brazilian coastline. This typical estuarine system is impacted by the heavy discharge of both industrial and domestic waste from the Rio de Janeiro metropolitan area. The mollusc community structure and distribution was investigated between 2000 and 2001, using a three month sampling design of 38 stations, according to austral seasons. Species abundance was aggregated into progressively higher taxa matrices (genus, family, order) and were analysed using multivariate techniques. Mollusc distribution in GB varied significantly in space and time and was probably ruled by the organic enrichment effects of hypoxia and altered redox conditions coupled with prevailing patterns of circulation. Within the sectors of GB an increasing gradient in mollusc diversity and occurrence was observed, ranging from the azoic and impoverished stations in the inner sector to a well-structured community in terms of species composition and abundance inhabiting the outer sector. The non-metric multidimensional scaling (nMDS) and cluster analysis showed similar results when species were aggregated into genera and families, while greater difference occurred at coarser taxonomic identification (order). The literature about taxonomic sufficiency has demonstrated that faunal patterns at different taxonomic levels tend to become similar with increased pollution. In Guanabara Bay, an analysis carried out solely at family level is perfectly adequate to describe the ecophysiological stress. Further aggregation to order level changed the perceived patterns of differences. However, a different taxonomic resolution can be chosen depending on the type of ecological patterns investigated.