Trends in studies of Brazilian stream fish assemblages

Dias, Murilo S.; Zuanon, Jansen; Couto, Thiago B. A.; Carvalho, Marla Soares; Carvalho, Lucélia Nobre; Espírito‐Santo, Helder M. V.; Frederico, Renata G.; Leitão, Rafael P.; Pires, Tiago; Torrente‐Vilara, Gislene; Vale, Julio do; Anjos, Maeda Batista dos; Mendonça, Fernando Pereira de; Tedesco, Pablo A.

doi:10.1016/j.ncon.2016.06.003

Cited by 27 publications

(39 citation statements)

References 24 publications

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“…No records of P. reticulata in the Amazon Forest biome were found, except in the municipalities of Manaus (Amazonas) and Belém (Pará). As most of Amazonia is inaccessible because of large forests, the lack of records may be linked to the low sampling effort in remote areas (Dias et al ., ). On the other hand, the records of P. reticulata in Manaus and Belém date from 1967 and 1962, respectively (Figure b), and despite the historical occupation of both municipalities (more than 340 years each), their large populations (more than 1.4 million inhabitants each) and the good knowledge of aquatic biodiversity in their metropolitan areas ( e.g ., Espírito‐Santo et al ., ), no records of guppies in the surrounding areas exist.…”

Section: Discussionmentioning

confidence: 99%

“…Some records were excluded because the geographical coordinates and/or sampling dates were not provided in detail or could not be determined directly from information in the publication itself (Dias et al ., ). Overall, incomplete and discarded records comprised only 0.7% (12 out of 1649 records) of the data set.…”

Section: Methodsmentioning

confidence: 97%

“…To evaluate the historical and current distribution of P. reticulata , two major data sources were searched for occurrence records. Data from all the studies cited in the recent comprehensive review of studies of Brazilian stream fish assemblages were compiled (Dias et al ., ). This search for primary studies and published papers from Brazilian journals that provide occurrence records of P. reticulata in Brazil was done using electronic databases and search engines ( i.e ., Web of Knowledge, Google Scholar and Scielo).…”

Section: Methodsmentioning

confidence: 99%

“…There are large sampling gaps across regions in Brazil ( e.g ., Dias et al ., ; Supporting Information Figure S1). Although the sampling effort in the northern region appears to be high (Supporting Information Figure S1), most of the records and sampling sites are along the major tributaries of the Amazon River.…”

Section: Methodsmentioning

confidence: 99%

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Historical distribution and current drivers of guppy occurrence in Brazil

Dias

Faria

Guarido

et al. 2020

Journal of Fish Biology

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Humans introduce non‐native species by means such as the deliberate release of fish into fresh waters and through commercial trade. The guppy Poecilia reticulata Peters, 1859, is commonly kept in aquaria and controls disease vectors, and now it occurs in many areas outside its natural distribution. Its initial habitat in Brazil was identified, and a study was performed to determine whether the density of guppies can be explained by the density of human population, per‐capita gross domestic product, level of human impact on the areas where guppies have been found and fish‐sampling effort. A total of 1402 guppy records were found; the southeastern region had the oldest records; and the southeastern, northeastern and central‐western regions had the maximum records. Low tolerance to the colder climate may be the reason for the lack of guppy records in the southernmost states. It was also observed that the occurrence of this fish is positively, yet weakly, related to the density of human population, indicating that improved regulations regarding its use in controlling disease vectors, the aquarium trade and education of aquarium hobbyists could help prevent the spread of this species and its potential impacts in Brazil.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Historical distribution and current drivers of guppy occurrence in Brazil

Dias

Faria

Guarido

et al. 2020

Journal of Fish Biology

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“…In the absence of information on which species of predators are most important in different stages of the life cycle, fish‐assemblage composition may be a reliable way to measure the effect of potential predation or competition on shrimp assemblages. Habitat variation also explains fish‐assemblage composition in streams (Dias et al, ; Espírito‐Santo, Magnusson, Zuanon, Mendonça, & Landeiro, ; Mendonça, Magnusson, & Zuanon, ), so effects of habitat on shrimp abundance could be confounded by the effect of habitat on fish composition.…”

Section: Introductionmentioning

confidence: 99%

Habitat segregation among freshwater shrimp species in an Amazonian rainforest stream system

et al. 2019

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Resource partitioning is a stabilising mechanism known to maintain species diversity in a variety of environments. Assemblages of stream shrimp species are structured by habitat features and predation. Therefore, segregation along habitat dimensions could facilitate coexistence among species in shrimp assemblages even when segregation is a result of predation pressure by fish species. These ecological interactions take place on a background modulated by biogeographic features, such as connectivity among drainages. However, these generalisations are mainly based on studies undertaken in temperate regions. We investigated whether abundances of rainforest shrimp species are related to habitat dimensions, and whether habitat–abundance relationships might be mediated through fish‐assemblage structure and the effect of drainages on connectivity. We detected effects of habitat variation on densities of shrimp species, but the magnitudes of the effects were larger for some species than others. Fish‐assemblage composition also affected shrimp densities. Two of the three species of shrimp showed some degree of habitat specialisation, but only along current‐velocity, depth, and pH gradients. Habitat segregation among species occurred along the current‐velocity and pH gradients. Relationships between density and environmental gradients differed between catchments for only one species and only along the pH gradient. Our findings provide evidence that rainforest‐stream shrimp species respond differently to environmental gradients and this could facilitate coexistence among species. However, interactions with fish seem to have a stronger effect on species densities, and consequently species segregation, than direct effects of the environmental gradients, resulting in apparent competition for these resources.

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