Future ecological studies of Brazilian headwater streams under global-changes

Callisto, Marcos; Melo, Adriano S.; Baptista, Darcílio Fernandes; Gonçalves, José Francisco; Graça, Manuel A. S.; Augusto, Fernanda Gaudio

doi:10.1590/s2179-975x2012005000047

Cited by 8 publications

(4 citation statements)

References 48 publications

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“…Although springheads and headwater creeks are legally considered permanent preservation areas they are often overlooked by conservation efforts in Brazil (Callisto et al, 2012). Given the current and future adverse ecological impacts derived from the presence of non-native poeciliids in these ecosystems, we propose management recommendations grouped into three categories: prevention, remediation and research.…”

Section: Discussionmentioning

confidence: 99%

Colorful invasion in permissive Neotropical ecosystems: establishment of ornamental non-native poeciliids of the genera Poecilia/Xiphophorus (Cyprinodontiformes: Poeciliidae) and management alternatives

Magalhães

Jacobi

2017

Neotrop. ichthyol.

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Headwater creeks are environments susceptible to invasion by non-native fishes. We evaluated the reproduction of 22 populations of the non-native livebearers guppy Poecilia reticulata, black molly Poecilia sphenops, Yucatan molly Poecilia velifera, green swordtail Xiphophorus hellerii, southern platyfish Xiphophorus maculatus, and variable platyfish Xiphophorus variatus during an annual cycle in five headwater creeks located in the largest South American ornamental aquaculture center, Paraíba do Sul River basin, southeastern Brazil. With few exceptions, females of most species were found reproducing (stages 2, 3, 4) all year round in the creeks and gravid females of all species showed small sizes indicating stunting. Juveniles were frequent in all sites. The fecundity of the six poeciliids was always low in all periods. The sex ratio was biased for females in most species, both bimonthly as for the whole period. Water temperature, water level and rainfall were not significantly correlated with reproduction in any species. Therefore, most populations appeared well established. The pertinence of different management actions, such as devices to prevent fish escape, eradication with rotenone and research about negative effects on native species, is discussed in the light of current aquaculture practices in the region.Keywords: Aquaculture, Invasive species, Livebearers, Reproduction, Stream.Riachos de cabeceira são ambientes susceptíveis à invasão por peixes não-nativos. Neste trabalho, avaliou-se a reprodução de 22 populações dos poecilídeos não-nativos guppy Poecilia reticulata, molinésia preta Poecilia sphenops, molinésia Poecilia velifera, espadinha Xiphophorus hellerii, plati Xiphophorus maculatus e plati variado Xiphophorus variatus durante diferentes anos em cinco riachos de cabeceira localizados no maior polo de piscicultura ornamental da América do Sul, bacia do rio Paraíba do Sul, sudeste do Brasil. Foram encontradas fêmeas da maioria das espécies em reprodução (estágios 2, 3, 4), durante todos os anos nos riachos e fêmeas grávidas de todas as espécies apresentaram pequeno tamanho indicando nanismo. Juvenis de todas as espécies foram frequentes em todos os locais. A fecundidade das seis espécies sempre foi baixa em todos os períodos. Para os períodos bimestrais e totais, encontrou-se mais fêmeas que machos na maioria das espécies. Temperatura e nível de água dos riachos, bem como precipitação pluviométrica não foram correlacionadas com a reprodução. Todas as populações estão estabelecidas nos locais e ações de gerenciamento como dispositivos para impedir a fuga de peixes, erradicação com rotenona e pesquisa científica sobre os efeitos negativos nas espécies nativas são discutidas em relação às práticas de piscicultura na região.

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Section: Discussionmentioning

confidence: 99%

Colorful invasion in permissive Neotropical ecosystems: establishment of ornamental non-native poeciliids of the genera Poecilia/Xiphophorus (Cyprinodontiformes: Poeciliidae) and management alternatives

Magalhães

Jacobi

2017

Neotrop. ichthyol.

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“…Streams are some of the most vulnerable freshwater ecosystems (Wantzen et al 2008) yet, contradictorily, are little studied from a scientific point of view (Buckup 1999;Castro et al 2003;Callisto et al 2012;Delariva and Silva 2013). The vulnerability of these low-order aquatic environments is linked, above all, to their small size and a biota with a high degree of endemism (Castro et al 2003;Almeida et al 2010), in addition to the recurring pressure caused by environmental degradation processes resulting from anthropic actions.…”

Section: Introductionmentioning

confidence: 99%

Parasites of Cambeva davisi (Siluriformes: Trichomycteridae) from the Cascavel stream, Neotropical area

et al. 2020

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The aim of the present study was to record the occurrence of parasites in Cambeva davisi (= Trichomycterus davisi) (Siluriformes: Trichomycteridae) from the Cascavel Stream, in the Iguaçu River basin, municipality of Cascavel, state of Paraná, Brazil, and present a review of the parasites reported infecting trichomycterids belonging to Cambeva and Trichomycterus species from the Neotropical region. Eighty-one fish specimens were collected using the electrofishing technique, with three standardized passes with a duration of 40 min, with extensions of 50 m for each site. In the laboratory, the fish were necropsied, and parasitological and histological analyses were conducted. Two parasite species were found and identified as nymphs of Sebekia oxycephala (Pentastomida) (Prevalence [P] = 8.54%) and Minilernaea floricapitella (Crustacea: Lernaeidae) (P = 1.23%), both representing new records of distribution and host-parasite relationships for genus Cambeva. The presence of the nymphs of S. oxycephala did not result in harmful histological changes or a significant inflammatory process in infected organs. Twenty-one taxa of parasites have been described parasitizing trichomycterids belonging to Trichomycterus (sensu stricto) and Cambeva from the Neotropical region. Nymphs of S. oxycephala have already been reported in freshwater fish belonging to 10 different orders, and M. floricapitella has been found parasitizing Brazilian fishes belonging to two orders. The nymphs of S. oxycephala did not cause histopathological changes and the new records of distribution and host-parasite relationships reported here enrich knowledge of the parasitic fauna of freshwater fish from the Neotropical region.

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“…Due to the important role of riparian zone in the stream integrity and as a energy source to the stream and the aquatic fauna (see Rodrigues and Leitão-Filho, 2001;Callisto et al, 2012), studies that demonstrate the relationship between the quality of allochthonous material and invertebrates colonization are greatly important to predict possible impacts on the aquatic ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Experimental manipulation of leaf litter colonization by aquatic invertebrates in a third order tropical stream

2015

Braz. J. Biol.

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Through a manipulative experiment, the colonization of leaf litter by invertebrates was investigated in two sections of a tropical stream (spatial scale) that differed in function of the canopy cover, one with the presence (closed area) and another without riparian vegetation (open area), during one month of the dry and one of the wet season (temporal scale). The work aimed to verify differences related to four variables: season, canopy cover, leaf type and leaf condition. Litter bags containing arboreal and herbaceous leaves (leaf type variable), non-conditioned and preconditioned (leaf condition variable) were placed at the bottom of the stream in each area (canopy cover variable) and season (dry and wet), and removed after 13-day colonization. The analysis of the remaining litter dry mass per leaf bag emphasizes differences related mainly to seasonality, canopy cover and leaf type, although leaf condition was also important when combined with those three factors. Comparing the abundance of invertebrates per treatment, there was a tendency of high predominance of Chironomidae during the dry season and greater taxa diversity and evenness during the wet season, when the water flow increase could alter the availability of microhabitats for local fauna. Even though canopy cover alone was not a significant source of variation in the abundance of invertebrates, the results showed a tendency of a combined effect of canopy cover with seasonality and leaf condition.Keywords: aquatic insects, leaf breakdown, headwater streams, seasonal variation, spatial variation. Manipulação experimental da colonização de detritos foliares por invertebrados aquáticos em um riacho tropical de 3ª ordem ResumoAtravés de um experimento de manipulação, a colonização de detritos foliares por invertebrados foi analisada em duas seções de um riacho tropical (escala espacial), que diferem em função da cobertura do dossel , um com a presença (área fechada) e outro sem vegetação ciliar (área aberta), durante um mês da estação seca e um da chuvosa (escala temporal). O trabalho teve como objetivo verificar as diferenças relacionadas a quatro variáveis: estação, cobertura vegetal, tipo e condição da folha. Sacos de náilon contendo folhas de uma planta arbórea e uma herbácea (tipo folha), não-condicionadas e pré-condicionadas (condição da folha) foram colocadas em cada área e estação do ano e removidos após 13 dias de colonização. A análise da massa seca remanescente dos detritos enfatizou diferenças relacionadas principalmente à sazonalidade, cobertura do dossel e tipo folha, embora a condição da folha também tenha sido importante quando combinado com esses três fatores. Comparando a abundância de invertebrados por tratamento, houve uma tendência de predominância de Chironomidae durante a estação seca e maior diversidade e equidade durante a estação chuvosa, quando o aumento do fluxo de água pode alterar a disponibilidade de micro-habitats para a fauna local. Apesar de cobertura do dossel sozinha não ter sido uma importante fonte de variaçã...

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Future ecological studies of Brazilian headwater streams under global-changes

Cited by 8 publications

References 48 publications

Colorful invasion in permissive Neotropical ecosystems: establishment of ornamental non-native poeciliids of the genera Poecilia/Xiphophorus (Cyprinodontiformes: Poeciliidae) and management alternatives

Colorful invasion in permissive Neotropical ecosystems: establishment of ornamental non-native poeciliids of the genera Poecilia/Xiphophorus (Cyprinodontiformes: Poeciliidae) and management alternatives

Parasites of Cambeva davisi (Siluriformes: Trichomycteridae) from the Cascavel stream, Neotropical area

Experimental manipulation of leaf litter colonization by aquatic invertebrates in a third order tropical stream

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