Changes in Pelagic Fish Community Composition, Abundance, and Biomass along a Productivity Gradient in Subtropical Lakes

Changes in Pelagic Fish Community Composition, Abundance, and Biomass along a Productivity Gradient in Subtropical Lakes
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亚热带湖泊中上层鱼类群落组成、丰度和生物量随生产力梯度的变化

DOI:
10.3390/w13060858
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发表时间:
2021-03
期刊:
Water (Switzerland)
影响因子:
--
通讯作者:
Jeppesen Erik
Jeppesen Erik
中科院分区:
其他
文献类型:
--
作者:
Yu Jinlei;Zhen Wei;Kong Lingyang;He Hu;Zhang Yongdong;Yang Xiangdong;Chen Feizhou;Zhang Min;Liu Zhengwen;Jeppesen Erik

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鱼类群落如何在温带湖泊中随富营养化而变化是有据可查的,而只有少数研究可用于亚热带湖泊。对长江流域36个湖泊的鱼类群落结构进行了研究。我们发现,鱼类物种丰富度和单位努力量(CPUE)的总渔获量显着增加叶绿素a(Chla)。在不同摄食类型中,随着叶绿素a的增加,食虫动物的比例显著增加,而杂食性底栖动物的比例变化不明显;随着Chla含量的增加,其在总渔获量中所占的比例显著下降。根据相对重要性指数(IRI),最重要和最具优势的鱼类是食兽性的四角(Toxabramis swinhonis),其次是杂食性的尖腹(Hemiculter leucisculus)和杂食性的鲫鱼(Carassius carassius)。这三个物种的CPUE与Chla的显着增加。到目前为止,重点是针对大型鱼类,但我们的研究结果强调,丰富的小型鱼类占主导地位,在我们的亚热带研究湖泊,即使在生物量方面,因此,我们建议,更多地关注这些物种的种群动态在未来。
How fish communities change with eutrophication in temperate lakes is well documented, while only a few studies are available from subtropical lakes. We investigate the fish community structure in 36 lakes located in the Yangtze River basin, covering a wide nutrient gradient. We found that fish species richness and total fish catch per unit effort (CPUE) increased significantly with chlorophyll a (Chla). Among the different feeding types, the proportion of zooplanktivores increased significantly with Chla, while the percentage of omnibenthivores showed no obvious changes; the CPUE of piscivorous Culter spp. increased with Chla, while their proportion of total catch decreased pronouncedly. Based on the index of relative importance (IRI), the most important and dominant fish species was the zooplanktivorous Sijiao (Toxabramis swinhonis), followed by the omniplanktivorous sharpbelly (Hemiculter leucisculus) and the omnibenthivorous crucian carp (Carassius carassius), a small-sized species belonging to the Cyprinidae family. The CPUE of these three species increased significantly with Chla. The focus has, so far, been directed at large fish, but as emphasized by our results, the abundant small fish species were dominant in our subtropical study lakes even in terms of biomass, and, accordingly, we recommend that more attention be paid to the population dynamics of these species in the future.
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