Structure and composition of ichthyofauna associated with cage fish farming and compared to a control area after severe drought in a Neotropical reservoir

IF 2 4区生物学 Q1 ZOOLOGY

Neotropical Ichthyology Pub Date : 2022-01-01 DOI:10.1590/1982-0224-2021-0141

Aymar Orlandi-Neto, R. V. Amorim, R. L. Delariva, A. F. Camargo, R. Veríssimo‐Silveira, I. P. Ramos

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引用次数: 2

Abstract

Abstract In 2014, an atypical drought in Southeast Brazil drastically reduced the water level in several reservoirs. We investigated the effects of this drought and the subsequent flood period on the attributes of ichthyofauna in an aquaculture and in a control area. Fish were collected bimonthly between 2014 and 2015 (drought) and 2016 (wet), using gill nets in the two sample areas in the Ilha Solteira reservoir, Upper Paraná River basin, Brazil. We compared ichthyofauna attributes between the drought and wet seasons in each area and between areas within each season. In the aquaculture area, the assemblages showed similar characteristics between the seasons. By contrast, the control area varied between seasons, with greater species richness, Shannon diversity, species evenness, and less β diversity in the wet season. Comparisons between areas in each season showed higher abundance in the fish farm within the drought season. Changes in structure and composition in the control area are possibly associated with new areas and resources made available by the flooding of marginal areas during the wet season. We inferred that the effect of the flood on the aquaculture community was attenuated by the continuous habitat structure such as shelters and food provided by the enterprise.

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新热带水库严重干旱后网箱养鱼相关鱼系的结构和组成，并与对照区进行比较

2014年，巴西东南部的一场非典型干旱严重降低了几个水库的水位。我们调查了干旱和随后的汛期对水产养殖区和对照区鱼系动物属性的影响。2014年至2015年(干旱)和2016年(潮湿)期间，在巴西上帕拉纳河流域Ilha Solteira水库的两个样本区使用刺网每个月采集一次鱼。我们比较了每个地区旱季和雨季之间以及每个季节内不同地区之间的鱼类区系属性。在水产养殖区，不同季节的组合特征相似。对照区物种丰富度、Shannon多样性、均匀度较高，湿润季节β多样性较低。各季节区域间的比较表明，干旱季节养鱼场的丰度较高。控制区结构和组成的变化可能与雨季边缘地区的洪水带来的新地区和资源有关。我们推断，企业提供的庇护所和食物等连续的生境结构减弱了洪水对水产养殖群落的影响。

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来源期刊

Neotropical Ichthyology 生物-动物学

CiteScore

2.80

自引率

17.60%

发文量

审稿时长

6-12 weeks

期刊介绍： Neotropical Ichthyology is the official journal of the Sociedade Brasileira de Ictiologia (SBI). It is an international peer-reviewed Open Access periodical that publishes original articles and reviews exclusively on Neotropical freshwater and marine fishes and constitutes an International Forum to disclose and discuss results of original research on the diversity of marine, estuarine and freshwater Neotropical fishes. -Frequency: Four issues per year published only online since 2020, using the ‘rolling pass’ system, which posts articles online immediately as soon as they are ready for publication. A searchable and citable Digital Object Identifier (DOI) is assigned to each article immediately after online publication, with no need to await the issue’s closing. -Areas of interest: Biology, Biochemistry and Physiology, Ecology, Ethology, Genetics and Molecular Biology, Systematics. -Peer review process: The Editor-in-Chief screens each manuscript submitted to Neotropical Ichthyology to verify whether it is within the journal’s scope and policy, presents original research and follows the journal’s guidelines. After passing through the initial screening, articles are assigned to a Section Editor, who then assigns an Associate Editor to start the single blind review process.