A prelimenary study on the population estimation of the periwinkles Tympanotonus fuscatus (Linnaeus, 1758) and Pachymelania aurita (Muller) at the Rumuolumeni mangrove swamp creek, Niger Delta, Nigeria

F. G. Bob-manuel
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引用次数: 9

Abstract

A study was carried out to estimate the populations of the periwinkles Tympanotonus fuscatus and Pachymelania aurita at the Rumuolumeni mangrove swamp creek in the Nigeria, Niger Delta sub-region. Weekly sampling of the gastropods was done and the capture mark-releaserecapture method was used for the population estimation. The Lincoln index was used for the calculation of the total population. The results indicated that T. fuscatus was more abundant in the area than P. aurita. It was opined that since P. aurita was more susceptible to pollution than T. fuscatus, its reduced population density could be attributed to the activities of oil companies operating in the Niger Delta region and their attendant pollution of the brackish water ecosystem, in addition to reproductive failure resulting from climate change.
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尼日利亚尼日三角洲Rumuolumeni红树林沼泽溪中长尾叶莺(Tympanotonus fuscatus, Linnaeus, 1758)和厚尾叶莺(Pachymelania aurita, Muller)种群估计的初步研究
对尼日利亚、尼日尔三角洲分区域Rumuolumeni红树林沼泽溪中褐鼓黄和金颊肿尾鲷的种群数量进行了研究。采用捕获标记-释放-捕获法对腹足类动物进行每周抽样,估计种群数量。林肯指数用于计算总人口。结果表明,褐霉变菌在该地区的数量大于金黄色葡萄球菌。由于aurita比T. fuscatus更容易受到污染,因此其种群密度的减少可能是由于在尼日尔三角洲地区经营的石油公司的活动及其对咸淡水生态系统的污染,以及气候变化导致的繁殖失败。
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