The Impact of Brook Trout (Salvelinus fontinalis) on an Experimental Stream Benthic Community: The Role of Spatial and Size Refugia

Bechara, José A.; Moreau, Gaétan; Hare, Landis

doi:10.2307/5194

Cited by 66 publications

(82 citation statements)

References 32 publications

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“…The same was found by Bechara et al (1993) who observed that the impact of the trout is higher on epibenthos of a bigger size and drift insects due to the trout predation habit of selecting by size and appearance. In this work only the epibenthos were evaluated, and there were differences between the exclusion treatments in both streams.…”

Section: Discussionsupporting

confidence: 74%

“…Allan (1982) and Flecker and Allan (1984) did not find influence of predators on the invertebrates, but Bechara et al (1993), Flecker and Townsend (1994), Dahl (1998) and Billy and Usseglio-Polatera (2002) found susceptibility of benthic invertebrates to fish predation. Hanson et al (1990) observed a great impact of macroinvertebrate predators on the structure of the benthic community, the same being observed by Prejs and Prejs (1992).…”

Section: Discussionmentioning

confidence: 99%

“…According to Sih and Wooster (1994), these differences are due to the way predators feed, in which the invertebrates cause significant local reductions to the amount of prey, while the vertebrates have a dubious effect, either reducing the prey density or not affecting it. The substrate, which provides shelter, is also considered by Bechara et al (1993) as an important factor in the determination of predation of invertebrates by fishes. In the streams studied, when individually evaluated, Plecoptera showed differences in abundance when the exclusion was promoted in both streams.…”

Section: Discussionmentioning

confidence: 99%

“…As species are not independent entities -taking into account that biotic and abiotic connections are essential for the maintenance of integrity of the lotic systems -the quantification of predator impact on the abundance of prey has been studied by some authors (Thorp and Bergey, 1981;Flecker and Allan, 1984;Wilzbach et al, 1986;Rahel and Stein, 1988;Soluk and Collins, 1988;Lancaster, 1990;Cooper et al, 1990;Hanson et al, 1990;Flecker, 1992;Prejs and Prejs, 1992;Bechara et al, 1993;Lancaster andRobertson, 1995, McIntosh andTownsend, 1996;Dahl, 1998;Billy and Usseglio-Polatera, 2002). Amongst the factors that influence the response of prey to predator are: a) predator feeding characteristics, being that not all the taxa are affected (Billy and Usseglio-Polatera, 2002); b) size of prey and substrate type, presenting a higher or lower degree of shelter sites (Bechara et al, 1993) and c) types of habitats, which may have a differentiated effect, taking into consideration that in habitats made up of riffles and rapids, colonization rates are higher than in pools, causing a lower response to predators (Cooper et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…Amongst the factors that influence the response of prey to predator are: a) predator feeding characteristics, being that not all the taxa are affected (Billy and Usseglio-Polatera, 2002); b) size of prey and substrate type, presenting a higher or lower degree of shelter sites (Bechara et al, 1993) and c) types of habitats, which may have a differentiated effect, taking into consideration that in habitats made up of riffles and rapids, colonization rates are higher than in pools, causing a lower response to predators (Cooper et al, 1990). Dahl (1998) considers the control of macroinvertebrate density in rivers and streams by fishes as a controversial issue, but the fish certainly exert influence on the behavior of the prey, sometimes to sub-lethal levels.…”

Section: Introductionmentioning

confidence: 99%

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Interactions between benthic macroinvertebrates and fishes in a low order stream in Campos de Cima da Serra, RS, Brazil

et al. 2008

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Benthic macroinvertebrates constitute the link between organic matter input in streams and fishes. However, the possibility of influence of predators on the invertebrates is still a controversial issue. The possibility of alteration of the benthic community by the modification in predation in a stream in the South of Brazil was studied by means of an exclusion experiment under semi-natural conditions. The exclusion showed an increase in the abundance of Plecoptera in the river where the rainbow trout was introduced, the larvae of Trichoptera also increased in abundance in the units of fish exclusion. This difference does not confirm the pressure applied by the trout on the benthic macro fauna due to differences in ichthyofauna and in the habitat of both rivers. Nevertheless, it points to the need for the development of studies concerning the trophic relations and the possible effects of this introduction in the aquatic biota.Keywords: benthic macroinvertebrates, low order streams, predation, exclusion experiment, exotic fish. Interações entre macroinvertebrados bentônicos e peixes em um rio de baixa ordem nos Campos de Cima da Serra, RS, Brasil ResumoOs macroinvertebrados bentônicos exercem a ligação entre a entrada de matéria orgânica nos rios e os peixes. Porém, a possibilidade de influência dos predadores sobre os invertebrados é uma questão ainda controversa. A possibilidade de alteração da comunidade bentônica, pela modificação na predação em um rio no sul do Brasil, foi estudada através de um experimento de exclusão em condições seminaturais. A exclusão resultou no aumento na abundância de Plecoptera no rio onde é feita a introdução de truta arco-íris; as larvas de Trichoptera também aumentaram em abundância nas unidades onde se efetuou a exclusão. Essa diferença não pode ser atribuída à presença das trutas, devido às diferenças na ictiofauna e de habitat dos dois rios. Entretanto mostra a necessidade de desenvolvimento de estudos acerca das relações tróficas e possíveis efeitos desta introdução sobre a biota aquática Palavras-chave: macroinvertebrados bentônicos, riachos de baixa ordem, predação, experimento de exclusão, peixe exótico.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interactions between benthic macroinvertebrates and fishes in a low order stream in Campos de Cima da Serra, RS, Brazil

et al. 2008

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Distribution of benthic invertebrate biomass and secondary production in relation to floodplain connectivity in a large river system (Paraná River, Argentina)

Zilli

2013

Internat. Rev. Hydrobiol.

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An investigation of benthic invertebrates was conducted in the Paraná River (Argentina) floodplain to assess patterns of biomass and production in relation to lateral river connectivity. Environmental and invertebrate samples were collected monthly from April 2005 to March 2006 at sites with different lateral surface-connection. The investigated invertebrate assemblages were characterized by high biomass and high production. The key factor determining the benthic assemblages was river connectivity and indirectly, substrate characteristics, water transparency, and depth. With increasing river connectivity, biomass and production of oligochaetes, native bivalves, and dipterans decreased, whereas both variables increased for non-native bivalves, gastropods and ephemeropterans. Benthic assemblages of most of sites had an average similarity in the composition of about 50% along the study period, but the number of taxa contributing to the overall similarity was lower at sites located at long distance from the main channel than at sites located next to it. Potential production was high compared to literature data, which underscores the importance of preserving floodplain areas and maintaining natural lateral connectivity. High habitat patchiness mediated by lateral-surface connectivity appeared to promote benthic resources diversity, which in turn controls productivity of this floodplain-river system.

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Complex trophic interactions in freshwater benthic food chains

Brönmark

Dahl

Greenberg

1997

Evolutionary Ecology of Freshwater Animals

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The Impact of Brook Trout (Salvelinus fontinalis) on an Experimental Stream Benthic Community: The Role of Spatial and Size Refugia

Cited by 66 publications

References 32 publications

Interactions between benthic macroinvertebrates and fishes in a low order stream in Campos de Cima da Serra, RS, Brazil

Interactions between benthic macroinvertebrates and fishes in a low order stream in Campos de Cima da Serra, RS, Brazil

Distribution of benthic invertebrate biomass and secondary production in relation to floodplain connectivity in a large river system (Paraná River, Argentina)

Complex trophic interactions in freshwater benthic food chains

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