Feeding habit and food partitioning in a stream fish community of Western Ghats, India

Johnson, Jeyaraj Antony; Arunachalam, M.

doi:10.1007/s10641-011-9889-9

Cited by 18 publications

(22 citation statements)

References 33 publications

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“…The Levin's index varies from 0 (diet specialized in few prays) to 1 (generalist diet). Diet overlap was calculated using the Horn index (R o ) as follows: Ro = (⌺(pij + pik) log(pij + pik) -⌺ pij logpik)/2 log2 (KREBS 1989), where pij is the proportion of resource i compared to all resources used by species j and pik is the proportion of resource i compared to all resources used by species k. Following ZARET & RAND (1971) and JOHNSON & ARUNACHALAM (2012), overlap values that were higher than 0.6 were considered significant.…”

Section: Moenkausia Dichrouramentioning

confidence: 99%

Feeding ecology of stream-dwelling Characidae (Osteichthyes: Characiformes) from the upper Tocantins River, Brazil

Moraes

Rezende

Mazzoni

2013

Zoologia (Curitiba)

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ABSTRACT. In this contribution we studied the trophic ecology of four Characidae species from the Cavalo Stream, upper Tocantins River, considering diet overlap and trophic niche breadth. The diet of the four species was composed of adult and immature insects, both autochthonous and allochthonous in origin. Autochthonous items dominated the diet of Moenkhausia dichroura (Kner, 1858), Bryconamericus sp., and Creagrutus atrisignum Myers, 1917. By contrast, allochthonous items were dominant in the diet of Astyanax bimaculatus (Linnaeus, 1758). Trophic niche breadth varied among species, with the highest value recorded for M. dichroura (0.48), followed by Bryconamericus sp. (0.39), A. bimaculatus (0.33) and C. atrisignum (0.29). Similarity analysis revealed two groups with different patterns of food preference. The first group was composed of insectivorous and the second by omnivorous species. The overlap in food items consumed by the four species studied was high. We suggest that resources are not limited in this stream and that competition might not be regulating these populations. This is one more case corroborating the general pattern registered for Tropical environments, where resource partitioning and specialization are responsible by the organization of fish communities.

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Section: Moenkausia Dichrouramentioning

confidence: 99%

Feeding ecology of stream-dwelling Characidae (Osteichthyes: Characiformes) from the upper Tocantins River, Brazil

Moraes

Rezende

Mazzoni

2013

Zoologia (Curitiba)

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“…Regarding streams in urban areas, the status of degradation is more accelerated, especially due to the small size of these water bodies, which make them more likely to sudden changes (Johnson & Arunachalam, 2012) than large rivers. A known factor that has been affecting severely these environments is the urbanization (Cunico, Ferreira, Agostinho, Beaumord, & Fernandes, 2012;Fogaça et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…A known factor that has been affecting severely these environments is the urbanization (Cunico, Ferreira, Agostinho, Beaumord, & Fernandes, 2012;Fogaça et al, 2013). This impact has as consequence an increase of the frequency and magnitude of water flows from heavy rains (Campana & Tucci, 2001;Zhou & Wang, 2007;Johnson & Arunachalam, 2012), a higher probability of erosion processes, changes in channel morphology which effects the composition of the riverbed (Wood & Armitage, 1997;Booth et al, 2004), and also an increased load of nutrients and pollutants concentration from …”

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confidence: 99%

<b>Diet of <i>Poecilia reticulata</i> Peters, 1959 in streams from Paraná River basin: influence of the urbanization

Alves

Tófoli

Ganassin

et al. 2016

Acta Sci. Biol. Sci.

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ABSTRACT. This study aimed to assess the diet of Poecilia reticulata in rural (RS) and urban stream (US) and under seasonal influence. We hypothesized that rainfall have a strong negative impact on the diet of the species in the US, due to its abrupt effect on food resources; in RS this effect is less apparent. Both streams belong to Pirapó River sub-basin, Paraná River basin. Fishes were sampled bimonthly, between July 2007 and June 2008 in three sample sites along the longitudinal gradient of the streams, using electrofishing. According to the Feeding Index, in both streams the population consumed almost exclusively detritus associated with aquatic organisms (>95%), regardless of the hydrological period. The main taxa explored by fish were Simuliidae in RS and Chironomidae in US. The diet was significantly different between streams; however, the seasonal factor was not significant, showing that the results were partially consistent with the suggested proposal. In US stream the diet of the fish followed an ordinarily pattern found in urban environments. Thus, P. reticulata can be used as a tool to assess environmental conditions due to its ability to reach bioindicator organisms, such as Chironomidae species. Keywords: benthivorous fish, feeding, macroinvertebrates, anthropic impact, Paraná River basin.Dieta de Poecilia reticulata Peters, 1959 em riachos da bacia do rio Paraná: influência da urbanização RESUMO. Este estudo objetivou investigar a dieta de Poecilia reticulata, em riacho rural (RR) e urbano (RU), sob influência sazonal. Foi hipotetizado que a chuva tem forte impacto negativo na dieta da espécie no RU, devido ao efeito abrupto sobre os recursos alimentares disponíveis, sendo este menos aparente em RR. Os riachos pertencem à sub-bacia hidrográfica do rio Pirapó, bacia do rio Paraná. Os peixes foram amostrados bimestralmente entre julho de 2007 e junho de 2008 em três pontos ao longo do gradiente longitudinal dos riachos, usando pesca elétrica. De acordo com o Índice alimentar, em ambos os riachos as populações consumiram quase que exclusivamente detrito associado com organismos aquáticos (>95%) independente do período hidrológico, sendo os principais: Simuliidae no RR e Chironomidae no RU. Houve diferença significativa na dieta entre os dois riachos, porém o fator sazonal não foi significativo, mostrando que os resultados foram parcialmente consistentes com a proposta sugerida. No RU a dieta mostrou um padrão comumente encontrado em ambientes urbanos. Dessa forma, P. reticulata pode ser usada como ferramenta para avaliar condições ambientais devido à sua habilidade em consumir organismos bioindicadores, tais como espécies de Chironomidae.Palavras-chave: peixe bentívoro, alimentação, impacto antrópico, bacia do rio Paraná. IntroductionThe fast radial expansion of urban centers has had as consequence the habitat degradation, and it reflects upon natural resources and aquatic ecosystems (Lee, 2000;Fogaça, Gomes, & Higuti, 2013). Regarding streams in urban areas, the status of degradation is more accele...

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“…Therefore, dietary analysis may reveal important information about trophic dynamics and resource partitioning among fish species (Ross, 1986), especially with regard to environments that are subject to sudden changes, such as streams (Johnson & Arunachalam, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The trophic opportunism observed for Neotropical fish fauna is influenced by the great variety of foods and is also related to the considerable temporal and spatial variations in the streams (Power, 1983;Winemiller & Winemiller, 2003;Esteves et al, 2008;Johnson & Arunachalam, 2012). In these environments, seasonal variations in the diet of fish species are common, with a wider niche breadth during the rainy season; in the dry season, these species become more specialized in a subset of resources (Winemiller et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Food-resource partitioning among fish species from a first-order stream in northwestern Paraná, Brazil

2012

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This study addressed the feeding ecology of fish fauna from a first-order stream located in a rural area. The purposes were to evaluate the influence of interspecific, seasonal and spatial factors on the diet, examine the dietary overlap, and determine the predominant food sources. Sampling was conducted in December 2007, September 2008, and March 2009, in three 50-m stretches of Itiz stream (upstream, intermediate, and downstream), through electrofishing. A total of 1,102 stomach contents were analyzed from 14 species, by the volumetric method. In general, allochthonous resources were predominant in the diets. Astyanax aff. fasciatus, Astyanax aff. paranae, Astyanax bockmanni, and Bryconamericus aff. iheringi consumed a higher proportion of plant remains, and Bryconamericus stramineus consumed predominantly Hymenoptera. The diets of Cetopsorhamdia iheringi, Characidium aff. zebra, Imparfinis schubarti, and Trichomycterus sp. consisted of aquatic insects, especially immature forms of Trichoptera, Ephemeroptera, Plecoptera, and Diptera. Hypostomus ancistroides, Hisonotus sp., Poecilia reticulata, and Rineloricaria aff. pentamaculata exploited mainly detritus, while Rhamdia quelen used a variety of items, predominantly terrestrial insects. Detrended Correspondence Analysis (DCA) showed a clear distinction among the species, with different morphology and feeding tactics. The Multi-Response Permutation Procedure (MRPP) supported this differentiation, and also indicated significant spatial and temporal variations in the dietary composition; the Indicator Value Method (IndVal) indicated the main items that contributed to these differences. The diet overlap among species was low (< 0.4) to around 78% of pairs, and the mean value did not vary significantly among the sites or between hydrological periods within each site. According to the null model of Pianka's index, the values for dietary overlap were significantly higher than expected at random, showing evidence of resource sharing. This was related to the availability of allochthonous resources, highlighting the importance of riparian vegetation as a source of these resources for maintaining the fish fauna of the stream.Este estudo abordou a ecologia alimentar da ictiofauna de um riacho de primeira ordem situado em área rural. Os objetivos foram verificar a influência dos fatores interespecíficos, sazonais e espaciais sobre a dieta, avaliar a sobreposição alimentar, além de determinar os recursos alimentares predominantes. As amostragens foram realizadas em dezembro/2007, setembro/ 2008 e março/2009, em três pontos do riacho Itiz (montante, intermediário e foz) com extensões de 50 m, através de pesca elétrica. Foram analisados 1102 conteúdos estomacais referentes a 14 espécies de acordo com o método volumétrico. De forma geral observou-se que a maior contribuição na dieta das espécies foi de recursos alóctones. Astyanax aff. fasciatus, Astyanax aff. paranae, Astyanax bockmanni, Bryconamericus aff. iheringi, consumiram maior proporção de vegetal e Bryconamericus stram...

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Feeding habit and food partitioning in a stream fish community of Western Ghats, India

Cited by 18 publications

References 33 publications

Feeding ecology of stream-dwelling Characidae (Osteichthyes: Characiformes) from the upper Tocantins River, Brazil

Feeding ecology of stream-dwelling Characidae (Osteichthyes: Characiformes) from the upper Tocantins River, Brazil

<b>Diet of <i>Poecilia reticulata</i> Peters, 1959 in streams from Paraná River basin: influence of the urbanization

Food-resource partitioning among fish species from a first-order stream in northwestern Paraná, Brazil

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