论文标题
尼日利亚热带河流的物理化学变量和大型无脊椎动物组合的空间变化
Spatial Variations in the Physico-chemical Variables and Macrobenthic Invertebrate Assemblage of a Tropical River in Nigeria
论文作者
论文摘要
在五个研究站，评估了尼日利亚埃塞波河一段的物理化学变量和巨大无脊椎动物组合的空间变化6个月。结果表明，在整个研究站中，温度，溶解的氧气和碳酸氢盐相似。电导率的最高值和总溶解固体在站1处记录。在研究站中，物理化学变量在研究站没有显着差异（P <0.05）。巨大无脊椎动物的丰度包括34个家庭中的61个分类单元，最高和最少的值分别发生在第3和1站。占整体丰度的52.77％的双翅目是遇到的主要群体，而decapodo（10.97％）在第1站中普遍存在，而在第2、3和4个站中常见的ephemeroptera（8.05％）构成了属于亚军组。除了所有研究站发生的dero limnosa和Nais SP外，记录的寡头射击仪中有超过68％限于第3个站。研究站中，大叶骨无脊椎动物的总体丰度没有显着差异（p <0.05）。基于规范的对应分析，总溶解固体，生化氧需求，碳酸氢盐和pH会影响大叶骨无脊椎动物的组合。 Ethiope River的研究延伸不受污染的严重污染，如在研究地点存在于白象翅目，Tricoptera，Odonata和Decapoda所表明的那样。然而，如有有机污染的迹象，如奈迪德寡聚体的优势和包括奇罗尼德（Chirononics）在内的某些双翅目种类所示。这项研究揭示了巨大的无脊椎动物多样性，这归因于研究站记录的物理化学变量的相对空间均匀性。
The spatial variation in the physico-chemical variables and macrobenthic invertebrates assemblage of a stretch of Ethiope River, Nigeria were evaluated for 6 months at five study stations. The results showed that temperature, dissolved oxygen and bicarbonates were similar across the study stations. The highest values of conductivity and total dissolved solids were recorded at station 1. The physico-chemical variables showed no significant different (P < 0.05) in the study stations. The abundance of the macrobenthic invertebrates comprises 61 taxa in 34 families, and the highest and least values occurred at stations 3 and 1 respectively. The Diptera which accounted for 52.77% of the overall abundance was the dominant group encountered, while the Decapoda (10.97%) which was prevalent in station 1 and the Ephemeroptera (8.05%) which was common in stations 2, 3 and 4 constituted the subdominant group. Over 68% of the oligochaetes recorded were restricted to station 3 except Dero limnosa and Nais sp that occurred in all the study stations. The overall abundance of the macrobenthic invertebrates was not significantly different (p < 0.05) among the study stations. Based on the canonical correspondence analyses, total dissolved solids, biochemical oxygen demand, bicarbonates and pH influenced the macrobenthic invertebrate assemblage. The study stretch of Ethiope River was reasonably free from gross pollution as indicated by the presence of Ephemeroptera, Tricoptera, Odonata and Decapoda at the study sites. However, there were indications of organic contamination as shown by the preponderance of naidid oligochaetes and certain dipteran species including the chironomids. This study revealed a high diversity of macrobenthic invertebrates, and this was attributed to the relative spatial homogeneity of the physico-chemical variables recorded at the study stations.
