尼日利亚阿南布拉河(Anambra River)雨季淡水蜗牛物化变化及丰度

C. Okoye, D. Echude, Chike Obinna Chiejina, F. A. Andong, Kingsley Chukwuebuka Okoye, Samuel Ejike Ugwuja, C. D. Ezeonyejiaku, Joseph Effiong Eyo
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引用次数: 4

摘要

快速多样化是淡水生物对环境变化的一种响应方式。本研究考察了尼日利亚阿南布拉河(Anambra River)雨季淡水蜗牛的物理化学变化和丰度。2019年6月至8月,每隔两周在河流的三个站点进行实地研究,即:Otuocha(第1站)、Otunsugbe(第2站)和Ukwubili(第3站),相距约8.35公里。采用2 cm网目大小的铲网,手工采摘,随机取样淡水蜗牛,并将水样送到实验室进行理化分析。共采集淡水蜗牛896只,分属6种(Afropomus balanoidea、Pomacea maculata、lynea滞螺、Lanistes ovum、Pila wernei和Saulea vitrea)。斑马菊为优势种,相对丰度为45.87%;玻璃Saulea为最小优势种,相对丰度为2.34%。溶解氧与macacea maculate呈显著负相关(r = -0.877, p = 0.002),溶解氧与thomalis lynea呈显著正相关(r = 0.840, p = 0.005)。物种多样性最高的是Otuocha(1.171),其次是Ukwubili(1.133)和Otunsugbe(0.856),平均气温分别为(23.1±0.1)°C、(27.30±0.00)°C和(26.80±0.03)°C。雨季阿南布拉河淡水螺的分布受河水理化变化的影响。因此,鼓励在更长的时间和不同的季节进一步研究物理化学变化对蜗牛分布的影响。
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Physicochemical Changes and Abundance of Freshwater Snails in Anambra River (Nigeria) During the Rainy Season
Abstract Rapid diversification is a way of responding to environmental change for freshwater organisms. This work examined the physicochemical changes and abundance of freshwater snails in Anambra River (Nigeria) during the rainy season. Field studies were conducted fortnightly from June to August 2019 at three stations of the river namely: Otuocha (station I), Otunsugbe (station II), and Ukwubili (station III) about 8.35 kilometers apart from each other. A scoop net of 2 cm mesh size and handpicking was used to sample freshwater snails randomly and water samples were taken to the laboratory for physicochemical analysis. A total of 896 freshwater snails belonging to 6 species (Afropomus balanoidea, Pomacea maculata, Lymnea stagnalis, Lanistes ovum, Pila wernei, and Saulea vitrea) were collected. Pomacea maculata was the most dominant species with a relative abundance of 45.87 %, while Saulea vitrea was the least dominant species with a relative abundance of 2.34 %. There was a significant negative correlation between dissolved oxygen and Pomacea maculate (r = –0.877, p = 0.002) and a positive correlation between dissolved oxygen and Stagnalis lymnea (r = 0.840, p = 0.005). The diversity of species was highest at Otuocha (1.171) followed by Ukwubili (1.133) and Otunsugbe (0.856) with average mean temperatures of (23.1 ±0.1) °C, (27.30 ±0.00) °C, and (26.80 ±0.03) °C respectively. The distribution of freshwater snails was influenced by the physicochemical variability of Anambra River during the rainy season. Therefore, further studies for a longer time and different seasons to examine the impact of physicochemical changes on the snail distribution are encouraged.
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