Effects of inter- and intraspecific competition and food availability on shredder invertebrates from an Amazonian stream

Viviane Caetano Firmino; Ruth Leila Ferreira Keppler; Eliane Solar GomesRenato Tavares Martins

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Effects of inter- and intraspecific competition and food availability on shredder invertebrates from an Amazonian stream

机译：Effects of inter- and intraspecific competition and food availability on shredder invertebrates from an Amazonian stream

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Shredders play an important role in leaf decomposition in headwater streams; however, their activities can be affected by irregular leaf availability, shredder density, and interactions between species. We performed two experiments to evaluate the effects of interspecific (InterComp) and intraspecific (IntraComp) competition and food availability on survival and leaf consumption of two shredder species, Triplectides egleri and Phylloicus elektoros, of an Amazonian stream. We hypothesized that: (ⅰ) shredder density (InterComp and IntraComp experiments) has a negative effect on shredder survival and leaf consumption due to increase in interactions between individuals (e.g. direct encounters) that will lead to competition; and (ⅱ) low food availability (IntraComp experiment) will increase competition among individuals, decreasing shredder survival and leaf consumption. In both experiments, high densities of shredders caused direct encounters between individuals and led to a decrease in survival and leaf consumption. Moreover, In the IntraComp experiment, lower survival and leaf consumption were observed in treatments with low food availability, probably associated with competitive interactions for limited resources. Our results indicate that decreased food availability, increased shredder density, and inter-and intraspecific interactions lead to competition for food and space, resulting in direct encounters between shredders and the occurrence of events such as cannibalism, and/or can inhibit feeding activities (e.g., avoiding conspecifics), thereby decreasing survival and leaf consumption.

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《Aquatic sciences》 |2022年第3期|39.1-39.11|共11页
作者
Viviane Caetano Firmino; Ruth Leila Ferreira Keppler; Eliane Solar GomesRenato Tavares Martins;
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作者单位

Programa de Pos-Graduacao em Zoologia, Universidade Federal do Para, Belem, Para, Brazil;

Instituto Nacional de Pesquisas da Amazonia-INPA, Coordenacao de Biodiversidade-COBIO, Manaus, Amazonas, Brazil;

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收录信息美国《科学引文索引》(SCI);
原文格式 PDF
正文语种英语
中图分类
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Aquatic insects; Cannibalism; Direct encounters; Leaf consumption; Survival; Trichoptera;

Effects of inter- and intraspecific competition and food availability on shredder invertebrates from an Amazonian stream

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