空间和时间上的浮游动物群落评价:一种人工湖生物监测工具

Helen Yetunde Omoboye, Adebukola Adenike Adedeji, I. Adeniyi
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摘要

目的:确定奥孙州Esa-Odo水库浮游动物区系的分类组成,确定水库浮游动物群落组成、分布丰度和群落结构的空间(水平和垂直)和季节变化。研究设计:横向和纵向选择采样站,覆盖水库全区。浮游生物样本每隔两个月采集一次,为期两年。方法:使用简易迈耶水采样器从深度采集样本。采用过滤法和沉淀法对净浮游生物和总浮游生物进行取样。浮游生物样品以5%福尔马林和1%卢戈尔溶液保存。测量,计数和比例的浮游动物记录使用显微摄影照片。利用识别键确定了浮游动物生物群的分类组成。数据分析采用PAST统计软件包。采用方差分析确定其时空变化。结果:本研究共记录浮游动物53种,分属轮虫目、枝虫目、桡足目和昆虫目4个类群。Rotifera是最具代表性的类群(61.21%)。横向上,湖相平均丰度最高的有24种;过渡带特有12种,河流带特有10种。在垂直方向上,大部分物种的平均丰度由水库表层向水库底部递减。表层特有9种,底层特有2种,中深特有1种。浮游动物生物在旱季最为丰富。结论:依沙奥多水库浮游动物种类丰富,具有丰富的水生群落和渔业生产的潜力。根据轮虫群的丰度,水库可以被归类为相当干净。然而,由于在浮游动物动物群中发现了一些耐污染的桡足类物种,因此应定期对湖泊进行适当的监测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Zooplanktonic Community Assessment over Space and Time: A biomonitoring Tool in an Artificial Lake
Aims: The prime objective of this study is to determine the taxonomic composition of the zooplankton fauna of Esa-Odo Reservoir in Osun State and determine the spatial (horizontal and vertical) and seasonal variations in the composition, distribution abundance, and community structure of the zooplankton community in the reservoir. Study design: sampling stations were selected horizontally and vertically to cover the entire zones of the reservoir. Planktonic samples were collected at two months intervals for two years. Methodology: Samples were collected from the depth using an improvised Meyer’s water sampler. Net and Total plankton were sampled by filtration and sedimentation methods. Planktonic samples were preserved as 5% formalin and 1% Lugol’s solution.  Measurement, enumeration, and scaled pictures of the recorded zooplankton were taken using a photomicrograph. The taxonomic composition of zooplankton biota was determined using identification keys. Data analysis was done using PAST Statistical Package. ANOVA was used to determine the spatio-temporal variations. Results: Fiftyty-three (53) pecies of total zooplankton recorded in this study belong to 4 groups:  Rotifera, Cladocera, Copepoda, and Insecta. Rotifera was the most represented group (61.21%). Horizontally, 24 species with the highest mean abundance characterized the lacustrine; while 12 species and 10 species were unique to the transition and riverine zones, respectively.  Vertically, most species had their mean abundance decreased from the surface to the bottom of the reservoir. A total of nine (9), two (2) and one (1) species were peculiar to the surface, bottom and mid-depth, respectively. Zooplankton organisms were most abundant during the dry season. Conclusion: Esa-Odo Reservoir comprised highly diversified zooplankton fauna with great potential to support rich aquatic community and fishery production. The reservoir can be classified as fairly clean based on the abundance of the rotifer group. However, the lake should be subjected to regular proper monitoring because of the presence of some pollution tolerant copepod species identified among the zooplankton fauna.
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