Importance of allochthonous resources in the diet ofAstyanax aff. fasciatus (Osteichthyes: Characidae) in streams: a longitudinal approach

Silva, Marlene R.; Fugi, Rosemara; Carniatto, Natália; Ganassin, Maria Julia Mileo

doi:10.1590/1676-06032014001613

Cited by 9 publications

(11 citation statements)

References 40 publications

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“…The predominance of autochthonous items of animal origin in the stomachs of individuals from this species observed here is in accordance with the fact that autochthonous prey predominates in environments without vegetation cover (Silva et al 2014) and the behavioral, morphological and feeding characteristics of genus Aequidens, such as greater activity during the day (Lowe-McConnell 1999), an improved visual system (Soares 1979) and foraging based on exploration of the substrate (Bührnheim 2002). The feeding behavior of A. tetramerus facilitates ingestion of autochthonous items, unlike that of other stream-dwelling fish species that swim and feed in midwater, ingesting large amounts of allochthonous items (Mazzoni and Iglesias-Rios 2002).…”

Section: Acta Amazonicasupporting

confidence: 89%

The seasonal diet of Aequidens tetramerus (Cichlidae) in a small forest stream in the Machado River basin, Rondônia, Brazil

Costa

Soares

2015

Acta Amaz.

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Trophic relationships in fish communities are affected by the availability of resources, which in turn is affected by spatial and temporal variations throughout the year. The aims of this study were to characterize the diet of A. tetramerus in a streamlet in the north of Brazil and compare its composition in different hydrological seasons (wet and dry seasons). Collections were performed every two months from October 2011 to September 2012 with the aid of seine nets, hand net and fishing traps in the streamlet located in the Machado River drainage basin in the Rondônia state. Most of the specimens collected were quite small (< 40 mm) and had empty stomachs. Our results showed that A. tetramerus feeds on a wide variety of items of plant origin, such as algae, seeds and leaves, as well as items of animal origin, including bryozoans, crustaceans, fish scales, terrestrial insects and detritus. The data also indicated higher consumption of aquatic insects than other food items, suggesting a primarily insect-based diet. Items of plant and allochthonous origin were consumed more in the wet season than in the dry season, but there were no seasonal differences in the consumption of animal and autochthonous items. KEYWORDS: Fish, Perciformes, Amazon, feeding habits, ornamental fish. Dieta sazonal de Aequidens tetramerus (Cichlidae) em um igarapé da bacia do rio Machado, Rondônia, Brasil RESUMORelações tróficas das comunidades de peixes são afetadas por variações espaciais e temporais, que alteraram a disponibilidade de recursos ao longo do ano. Os objetivos deste estudo foram caracterizar a dieta de A. tetramerus no igarapé estudado, bem como comparar se a composição dos itens da dieta desta espécie dependem da estação hidrológica (período chuvoso e seco). As coletas foram realizadas bimestralmente, de Outubro de 2011 a Setembro de 2012, com auxílio de picaré, puçá e covos em um igarapé localizado na bacia do rio Machado no estado de Rondônia. A maioria dos espécimes eram pequenos (< 40 mm) e tinham estômago vazio. Observou-se que A. tetramerus se alimenta de uma grande variedade de itens de origem vegetal, como algas, sementes e folhas; e de itens de origem animal como: briozoários, crustáceos, escamas, insetos terrestres e detritos. Constatou-se que há maior consumo de insetos aquáticos, o que sugere uma dieta insetívora. Itens de origem vegetal e alóctones foram mais consumidos na estação chuvosa do que na estação seca. Não houve diferença na composição da dieta dos peixes entre as estações de seca e chuva.

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Section: Acta Amazonicasupporting

confidence: 89%

The seasonal diet of Aequidens tetramerus (Cichlidae) in a small forest stream in the Machado River basin, Rondônia, Brazil

Costa

Soares

2015

Acta Amaz.

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“…Trophic webs are often studied through a traditional approach wherein species are assigned to guilds or trophic groups, without considering ontogeny (Rudolf et al, 2014). This practice has often been adopted in the existing research on Astyanax species (Bennemann et al, 2005;Silva et al, 2014). However, ontogenetic niche shifts are known from 80 % of animal taxa (Werner, 1988;Hertz et al, 2016); furthermore, the main source of intraspecific diversity in ecosystems is the variation across ontogenetic stages and size of individuals (Rudolf and Rasmussen, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Protection of its habitats should consider not only the environmental quality of the streams, but also the integrity of adjacent riparian vegetation. The importance of riparian vegetation to fish diet is well recognized and documented for the allochthonous feeder Astyanax species (Gomiero and Braga, 2003;Borba et al, 2008;Ferreira et al, 2012;Souza and Lima-Junior, 2013;Silva et al, 2014;Leite et al, 2015). Conserving the streams is also important for those autochthonous feeders (Cavalheiro and Fialho, 2016).…”

Section: Discussionmentioning

confidence: 99%

Ontogeny of feeding by Astyanax paris in streams of the Uruguay River Basin, Brazil

Cavalheiro¹,

Fialho²

2019

Anim. Biodiv. Conserv.

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Ontogeny of feeding by Astyanax paris in streams of the Uruguay River Basin, Brazil. We studied the ontogeny of feeding by Astyanax paris, an insectivorous characid fish from streams of the Uruguay River Basin in southern Brazil. Size-based differences in diet composition were evaluated using permutational multivariate analysis of variance (PERMANOVA). Six streams surveyed over twelve months yielded twenty specimens for analysis of stomach contents. Smaller individuals (SL ≤ 25 mm) consumed mainly aquatic insects. As body size increased, there was a gradual shift to a diet dominated by terrestrial insects. Ontogeny of feeding habitats thus changes the species' position in stream food webs. ResumenOntogenia de la alimentación de Astyanax paris en los arroyos de la cuenca fluvial del río Uruguay, en Brasil. Estudiamos la ontogenia de la alimentación de Astyanax paris, un pez carácido insectívoro de los arroyos de la cuenca del río Uruguay, en el sureste de Brasil. Las diferencias de la composición de la dieta en función del tamaño se analizaron mediante el análisis de varianza multivariante con permutaciones (PERMANOVA). Se muestrearon seis arroyos durante 12 meses y se obtuvieron 20 especímenes para analizar el contenido del estómago. Los individuos más pequeños (longitud estándar ≤ 25 mm) consumieron principalmente insectos acuáticos. A medida que aumentaba el tamaño corporal, se pasaba gradualmente a una dieta compuesta principalmente por insectos terrestres. En consecuencia, la ontogenia de los hábitats de alimentación cambia la posición de las especies en las redes tróficas de los arroyos.

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“…Food resources from riparian vegetation often play an important role in the diet of stream fish. In streams with greater vegetation cover and better preservation, several studies indicate that allochthonous items are more important for fish (Abilhoa et al, 2010;Oliveira & Bennemann, 2005;Silva et al, 2014). This proportion was lower in streams with low vegetation cover and low flow.…”

Section: Proportion Of Allochthonous Itemsmentioning

confidence: 99%

Resource use by omnivorous fish: Effects of biotic and abiotic factors on key ecological aspects of individuals

Fernando

Súarez

2020

Ecology of Freshwater Fish

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Intraspecific variations in the use of resources result from the influence of factors related to individuals and the environment in which they live. Knowing which factors and how they influence the choice of a given resource allows us to understand the different ecological roles of individuals in a population (Singer & Bernays, 2003). This adaptive strategy maximises energy production and optimises the growth and reproductive success of individuals (Araújo et al., 2011;

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Importance of allochthonous resources in the diet ofAstyanax aff. fasciatus (Osteichthyes: Characidae) in streams: a longitudinal approach

Cited by 9 publications

References 40 publications

The seasonal diet of Aequidens tetramerus (Cichlidae) in a small forest stream in the Machado River basin, Rondônia, Brazil

The seasonal diet of Aequidens tetramerus (Cichlidae) in a small forest stream in the Machado River basin, Rondônia, Brazil

Ontogeny of feeding by Astyanax paris in streams of the Uruguay River Basin, Brazil

Resource use by omnivorous fish: Effects of biotic and abiotic factors on key ecological aspects of individuals

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