Effects of predation risk on invertebrate leaf-litter shredders in headwater streams in three Brazilian biomes

Wander Ribeiro Ferreira; Renan de Souza Rezende; Renato Tavares MartinsJose Francisco Goncalves JrNeusa HamadaMarcos Callisto

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Effects of predation risk on invertebrate leaf-litter shredders in headwater streams in three Brazilian biomes

机译：Effects of predation risk on invertebrate leaf-litter shredders in headwater streams in three Brazilian biomes

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We evaluated the effect of predation risk for larvae of Phylloicus (Trichoptera: Calamoceratidae) on leaf-litter consumption and case-building in experimental microcosms performing three Brazilian biomes: Amazon Forest, Atlantic Rainforest, and Brazilian Savanna (Cerrado). We hypothesized the following: (1) predation risk by fish would decrease the feeding rate but increase the sheltering activities of Phylloicus larvae, mainly in a high-stimulus treatment (visual and chemical cues from predators' presence); and (2) when offered a resource with the same palatability, leaf consumption by Phylloicus larvae from Amazon Forest and Atlantic Rainforest will be higher than in those from the Savanna, independent of the predation risk. We found that larvae of Phylloicus species from the three biomes use the leaf disks in different proportions for case-building and consumption: Amazon Forest (case-building = 44% and consumption = 50%), Atlantic Rain Forest (60% and 36%), and Brazilian Savanna (32% and 26%). The larvae case-building and leaf consumption by Phylloicus were higher under predation than in the control treatment using data uncorrected by the biomass of the individual. On the other hand, case-building was not different among all treatments, and leaf consumption was lower under predation than in the control treatment when corrected by biomass. Our results indicate that predation risk can affect the behavior of Phylloicus due to a stress response to predator presence. Therefore, it might mean top-down effects on shredders during leaf-litter processing in Neotropical headwater streams. Besides, insectivorous fish could be the key group for functioning in these ecosystems.

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《Aquatic sciences》 |2023年第1期|28.1-28.10|共10页
作者
Wander Ribeiro Ferreira; Renan de Souza Rezende; Renato Tavares MartinsJose Francisco Goncalves JrNeusa HamadaMarcos Callisto;
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作者单位

Departamento de Genetica, Ecologia e Evolucao, Laboratorio de Ecologia de Bentos, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Av. Presidente Antonio Carlos 6627, CP 486, Belo Horizonte, Minas Gerais CEP 31270-901, Brazil, Depar;

Programa de Pos-Graduacao em Ciencias Ambientais, Universidade Comunitaria Regional de Chapeco, Avenida Senador Atilio Fontana, 591-E - Egapi, Chapeco, SC CEP 89809-000, Brazil;

Coordenacao de Biodiversidade - CoBio, Instituto Nacional de Pesquisas da Amazonia, Av. Andre Araujo, 2936, Manaus, Amazonas CEP 69067-375, BrazilInstituto de Ciencias Biologicas, Departamento de Ecologia, Laboratorio de Limnologia-AquaRiparia, Universidade de Brasilia, S/N, Campus Darcy Ribeiro, Asa Norte, Brasilia, DF CEP 70910-900, BrazilDepartamento de Genetica, Ecologia e Evolucao, Laboratorio de Ecologia de Bentos, Instituto de Ciencias Biologicas, Universidade Federal de Minas Gerais, Av. Presidente Antonio Carlos 6627, CP 486, Belo Horizonte, Minas Gerais CEP 31270-901, 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
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Aquatic ecosystems; Fish; Longitudinal gradient; Trophic interactions;

Effects of predation risk on invertebrate leaf-litter shredders in headwater streams in three Brazilian biomes

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