巴拉圭东部Jejuí河上游流域的鱼类多样性

IF 0.9 Q4 ECOLOGY Neotropical Biodiversity Pub Date : 2022-04-17 DOI:10.1080/23766808.2022.2061299
G. L. Zuercher, L. Jackson, D. Edds, J. Miller, S. Satterlee, Alan Butler, F. R. Pinto, Sixto Fernandez, Myriam C. Velazquez, D. Koch, Phylicia Schwartz
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引用次数: 0

摘要

Jejuí河上游是巴拉圭河在巴拉圭东部的一条主要支流,也是Mbaracayú森林生物圈保护区的主要水系。尽管生物圈保护区在国际上具有重要意义,并对其陆生动植物区系进行了详细的记录,但其溪流中的鱼类区系仍然相对未知,以前记录的只有48种。我们在五年内(2007-2011年)对生物圈保护区内的35个地点进行了采样,以评估其鱼类的丰富程度。这些调查为生物圈保护区提供了105个新物种,包括两个新记录目,裸子形目和鲤形目,以及14个新记录科。鱼类群落组成与巴拉圭河流域以前报道的鱼类群落相似,特征型和志幻型占大多数(分别为57.1%和31.4%)。事后分析显示,与自然保护区以外的地区相比,Mbaracayú森林自然保护区(生物圈保护区内的核心森林保护区)内的鱼类种群多样性显著增加,这表明森林砍伐和土地转换对这些源头溪流中的鱼类种群产生了负面影响。大范围的区域森林砍伐更加强调将保护当前生物多样性的重要管理决策。
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Ichthyofaunal diversity in the upper Jejuí River watershed in eastern Paraguay
ABSTRACT The upper Jejuí River is a major tributary of the Paraguay River in eastern Paraguay and is the principal drainage for the Mbaracayú Forest Biosphere Reserve. Despite the international significance of the biosphere reserve and detailed documentation of its terrestrial fauna and flora, the fish fauna in its streams remains relatively unknown, with 48 species previously recorded. We sampled 35 sites within the biosphere reserve over five years (2007–2011) to assess the richness of its ichthyofauna. These surveys yielded a new total of 105 known species for the biosphere reserve, including two newly-recorded orders, Gymnotiformes and Cyprinodontiformes, and 14 newly-recorded families. Fish community composition resembled that of previously-reported fish communities from the Paraguay River drainage, with characiforms and siluriforms comprising the majority of the species (57.1% and 31.4%, respectively). Post hoc analyses showed significantly greater ichthyofaunal diversity at sites within the Mbaracayú Forest Nature Reserve, a core protected forest area within the biosphere reserve, compared to areas outside the nature reserve, suggesting a negative impact from deforestation and land conversion on fish assemblages in these headwater streams. Broad regional deforestation places greater emphasis on important management decisions that will protect current biodiversity.
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来源期刊
Neotropical Biodiversity
Neotropical Biodiversity Environmental Science-Ecology
CiteScore
1.80
自引率
0.00%
发文量
39
审稿时长
24 weeks
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