Length-weight relationship and reproduction of the guppy Poecilia reticulata (Cyprinodontiformes: Poeciliidae) in urban drainage channels in the Brazilian city of Belém

Montag, Luciano Fogaça de Assis; Freitas, Tiago Magalhães da Silva; Raiol, Roberta Dannyele de Oliveira; Silva, Marlene Vasconcelos da

doi:10.1590/s1676-06032011000300007

Cited by 15 publications

(11 citation statements)

References 17 publications

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“…Mature individuals of H. ancistroides were verified only in October, which is consistent with the reproductive period (between October and January) characterized for the species (Viana et al, 2008). For P. reticulata and R. quelen, individuals in reproductive stages (in maturation and mature) were registered during the entire sampling period, which suggests prolonged reproductive activity for this species, as also evidenced by and Montag et al (2011). As the Mandacaru Stream is characterized as a degraded environment subjected to high organic matter input, it is possible to infer that the biological characteristics of the three studied species indicate tolerance to environmental impacts (Cunico et al, 2006), thus, favoring the survival and reproduction due to the strategies of life adopted by the species.…”

Section: Discussionsupporting

confidence: 83%

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<b>Population structure of fishes from an urban stream

Zanatta

Pazianoto

Cionek

et al. 2017

Acta Sci. Biol. Sci.

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The aim of this study was to identify the population structure of the ichthyofauna in an urban stream within an environmental protection area in southern Brazil. Quarterly samplings were conducted between October 2009 and August 2010. Poecilia reticulata was the most abundant species, followed by Hypostomus ancistroides and Rhamdia quelen. It was found a higher proportion of adults instead of juveniles from P. reticulata and R. quelen populations, while the opposite was recorded for H. ancistroides. Sex ratio of 1:1 was found for H. ancistroides, but differed significantly for P. reticulata and R. quelen. Females of P. reticulata and R. quelen reached higher length than males in the smaller and higher length-classes, while H. ancistroides females were only longer in initial length-classes. It was recorded higher occurrence of mature and maturing individuals. Mature individuals of H. ancistroides were sampled in October, and P. reticulata and R. quelen throughout the sampling period. Despite adverse environmental conditions, the occurrence of juveniles indicates reproductive activity for these species. Population structure studies in degraded systems are urgent, since life-history features of species may suffer changes due to anthropic impacts. Providing such information contributes to decision making and management of degraded systems.

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Section: Discussionsupporting

confidence: 83%

“…The studied species showed reproductive activity earlier when compared to other locations (Gomes, Golombieski, Gomes, & Baldisserotto, 2000;Gomiero, Souza, & Braga, 2007;Montag, Freitas, Raiol, & Silva, 2011). The limnological variables of the stream can have influenced the onset of the first sexual maturity of analyzed species.…”

Section: Discussionmentioning

confidence: 79%

<b>Population structure of fishes from an urban stream

Zanatta

Pazianoto

Cionek

et al. 2017

Acta Sci. Biol. Sci.

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“…The specimens were identified according to Britski et al (2007), Graça & Pavanelli (2007) and Benine et al (2009), labeled, weighed and measured. Only adult individuals were analyzed (Gomiero et al, 2008;Montag et al, 2011), considering that the ontogenetic growth can promote significant changes in morphology (Novakowski et al, 2004;Vitule et al, 2008) or feeding habit (Drewe et al, 2004). Voucher specimens of Apistogramma commbrae (Regan, 1906) Morphometric data estimation.…”

Section: Methodsmentioning

confidence: 99%

Ecomorphology and use of food resources: inter- and intraspecific relationships of fish fauna associated with macrophyte stands

2016

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Based on the form-function interaction and its consequence to niche exploitation by fish species, the study aimed to identify ecomorphological patterns and to investigate the possibility of explaining the trophic niche breadth using the pattern of intraspecific ecomorphological diversity. We tested the following hypotheses: i) the morphology explains variations in diet among fish species; ii) the intraspecific ecomorphological diversity is related to the breadth of the trophic niche explored by the species, so that species that feed on a wider range of resources have greater variation in body shape compared to those specialized in resource consumption. Fish were collected in stands of the aquatic macrophytes Eichhornia azurea and Eichhornia crassipes in lentic environments of the Upper Paraná River floodplain, Brazil. Two major trends were observed in the morphological space: fish with body shapes adapted to explore the substrate and others with a design that facilitates the capture of food items in more structured habitats. The relationship of diet with body shape was confirmed by significant relationships between matrices of trophic and morphological distances, providing evidence that morphology is related to interspecific variations in the use of trophic resources. However, the ranges of morphological and intraspecific trophic variations were not significantly related, rejecting the second hypothesis about the relationship between intraspecific ecomorphological diversity and trophic niche breadth. The morphological characteristics often have multiple ecological roles, which could result in trade-off among these functions. Thus, fish with highly specialized morphology may show specialist feeding or even generalist habit, because in this case some resources may be difficult to exploit, even by a specialist. Species with low and high morphological diversity demonstrated narrow trophic niche and the availability of resources may have been essential for consumption. Therefore, species morphology is related to the use of food resources and ecomorphology can be considered an important tool for the prediction of the exploited niche space by species in assemblages. However it is not possible to predict if species with greater intraspecific morphological diversification indeed have wider niche, since the abundance or scarcity of the available food resources may interfere with trophic niche breadth.Baseado na interação entre forma e função e suas consequências para exploração do nicho pelas espécies, o objetivo deste estudo foi identificar padrões de variação ecomorfológica e investigar se a amplitude de nicho trófico pode ser explicada pelo padrão de diversificação ecomorfológica intraespecífica. Assim, testaram-se as hipóteses: i) a morfologia explica as variações na dieta entre as espécies de peixes ii) a diversificação morfológica intraespecífica está relacionada com a amplitude do nicho trófico explorado pelas espécies, de modo que, espécies que se alimentam de maior variedade de recursos apresentam maior variação ...

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“…Weight‐length relationship supported allometric growth in P. reticulata and X. maculatus , in the range of mean values in wild and acclimatized populations (Froese & Pauly, a, 2017 b; García et al., ; Montag, Freitas, Raiol, & Silva, ) although data dispersion was wider in the case of P. reticulata , possibly due to the scarcity of specimens (Table ).…”

Section: Resultsmentioning

confidence: 74%