Trophic relationships in fish assemblages of Neotropical floodplain lakes: selectivity and feeding overlap mediated by food availability

IF 0.5 4区生物学 Q4 ZOOLOGY Iheringia Serie Zoologia Pub Date : 2017-10-09 DOI:10.1590/1678-4766E2017035

R. M. Dias, J. C. G. Ortega, L. Gomes, A. Agostinho

引用次数: 19

Abstract

ABSTRACT. The relationships between the degree of dietary overlap and food availability, and implications for food selectivity of fish species were evaluated at floodplain lakes on the upper Parana River floodplain. The hypothesis tested were: i) species become less selective in lakes with high availability of food resources; ii) species present higher food overlap in conditions of high availability of food resources; and iii) individuals of the species, become less specialized, in this case the food overlap will be high in conditions of more availability of food resources. In general, with the results was observed that species become less selective when the environment provided higher availability of food resources. Interspecific overlap did not show a pattern when evaluating availability of food resources in the lakes. However, intraspecific overlap tended to be more accentuated in conditions of high availability of resource food.

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新热带洪泛平原湖泊鱼类组合的营养关系:食物供应介导的选择性和摄食重叠

摘要研究了巴拉那河上游河漫滩湖泊中鱼类食物重叠度与食物可得性之间的关系及其对鱼类食物选择性的影响。经检验的假设是:1)在食物资源丰富的湖泊中，物种的选择性降低;Ii)在食物资源高可得性条件下，物种表现出较高的食物重叠;物种个体变得不那么专门化，在这种情况下，在食物资源更多可用性的条件下，食物重叠将会很高。总的来说，观察到的结果是，当环境提供更高的食物资源时，物种的选择性会降低。在评估湖泊食物资源的可用性时，种间重叠没有显示出一种模式。然而，在资源食物高可用性的条件下，种内重叠往往更加突出。

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来源期刊

Iheringia Serie Zoologia 生物-动物学

CiteScore

1.00

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Iheringia, Série Zoologia, edited by the “Museu de Ciências Naturais” of the “Fundação Zoobotânica do Rio Grande do Sul”, publishes original research findings in zoology with emphasis on taxonomy, systematics, morphology, natural history, and community or population ecology of species from current Neotropical fauna. Scientific notes will not be accepted for publication. Species lists without a taxonomic approach, or that are not the result of studies on the ecology or natural history of communities will not normally be accepted. The same applies to identification keys of groups of taxa defined by political boundaries. Authors wishing to inquire about the scope of the journal or the suitability of a particular topic are encouraged to contact the Editorial Board prior to submission. Furthermore, articles with a main focus on agronomy, veterinary, zootechny or other areas involving applied zoology will not be accepted. Its abbreviated title is Iheringia, Sér. Zool., which should be used in bibliographies, footnotes and bibliographical references and strips.