Use of terrestrial arthropod prey by a stream-dwelling cyprinid fish

Garman, Greg C.

doi:10.1007/bf02028848

Cited by 62 publications

(65 citation statements)

References 26 publications

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“…The highest abundance of some species of Diptera (Velásquez de Ríos et al, 2004) occurs at the transition period between rainy-dry seasons, also the period of greatest ingestion of Diptera larvae by C. guanes. In the habitats of many temperate and tropical fishes the timing of the allochthonous food input coincides with a period of reduced availability of aquatic prey (Garman, 1991). That also seems to be the case for C. guanes, whose diet showed that the ingestion of seeds was concomitant with a decline in ingest of Diptera larvae.…”

Section: Discussionmentioning

confidence: 93%

How does diet influence the reproductive seasonality of tropical freshwater fish?: A case study of a characin in a tropical mountain river

2009

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Seasonal breeding of tropical freshwater fish may be synchronized with periods of high food consumption. We explored this hypothesis by studying the relationship between diet and reproductive activity of Creagrutus guanes (Teleostei, Characidae). Our results showed that C. guanes had a generalist and omnivorous diet dominated by aquatic insects (mainly Diptera larvae) and seeds. Creagrutus guanes did not show intersexual or ontogenetic variation in diet. Peaks of feeding activity during rainy months were not synchronized with breeding in dry months. Our results do not support the hypothesis that the reproductive season has to be synchronized with high food consumption. We discussed the hypothesis fat reserves may be an important factor for the desynchronization of peaks of feeding and reproduction as explanation of seasonal breeding of this species.A reprodução sazonal de peixes tropicais de água doce pode estar sincronizada com períodos de alto consumo de alimento. Nós examinamos esta hipótese estudando a relação entre dieta e atividade reprodutiva de Creagrutus guanes (Teleostei, Characidae). Nossos resultados mostraram que C. guanes teve uma dieta generalista e onívora, com predominância de insetos aquáticos (principalmente larva de Diptera) e sementes. Creagrutus guanes não apresentou variação intersexual ou ontogenética na dieta. Picos de atividade alimentar durante os meses chuvosos não foram sincronizados com atividade reprodutiva nos meses secos. Nossos resultados não sustentam a hipótese de que a estação reprodutiva está sincronizada com o consumo elevado de alimento. A reserva de gordura pode ser um fator importante para a dessincronização de picos de alimentação e reprodução (a reserva de gordura pode influenciar a ausência de sincronia entre os picos de alimentação e reprodução). São apresentadas hipóteses alternativas para a explicação de desova sazonal da espécie.

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Section: Discussionmentioning

confidence: 93%

How does diet influence the reproductive seasonality of tropical freshwater fish?: A case study of a characin in a tropical mountain river

2009

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“…Teoricamente, é nesta época que ocorre maior disponibilidade de invertebrados terrestres para os peixes desses ambientes, devido à maior produtividade geral e à expansão no curso de água para áreas marginais (LOWE-MCCONNELL, 1999). Insetos terrestres foram predominantes nos conteúdos estomacais ao longo de todo o período de estudo, fato amplamente estabelecido para a ictiofauna de riachos (ANGERMEIER & KARR, 1983;GARMAN, 1991;REZENDE & MAZZONI, 2006). Apesar de vários estudos sobre a alimentação de espécies de Characidae indicarem forte influência sazonal na dieta (ARANHA et al, 2000;ESTEVES & PINTO-LOBO, 2001;MAZZONI & REZENDE, 2003), para as espécies de Moenkhausia esta variável teve pouca influência, o que sugere que estes insetos estiveram disponíveis durante todo o ano.…”

Section: Discussionunclassified

Uso do alimento por duas espécies simpátricas de Moenkhausia (Characiformes, Characidae) em um riacho da Região Centro-Oeste do Brasil

Tófoli

Hahn

Alves

et al. 2010

Iheringia, Sér. Zool.

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ABSTRACT. Food used by two sympatric species of Moenkhausia (Characiformes, Characidae), in a stream of centerwestern Brazil. This study evaluated the seasonality in the diet of Moenkhausia dichroura (Kner, 1858) and M. sanctaefilomenae (Steindachner, 1907), sympatric species of the Cancela stream, state of Mato Grosso, Brazil. Regardless of the seasonal period, allochthonous food source predominated in the diet of both species (>50% of all items consumed) and among these terrestrial insects were the dominant resource. However, aquatic insects were important in the diet of M. dichroura as well. Hymenoptera (Formicidae) was the dominant item to both species, thus they were characterized as terrestrial insectivorous. The restricted diet of these species is confirmed by the trophic niche breadth, whose values were in general low: Ba=0.26 to M. dichroura in both periods and Ba=0.41 and 0.38 in the dry and rainy period, respectively, to M. sanctaefilomenae. The feeding overlap was high in the rainy period (O jk =0.75) and intermediate in the dry period (O jk =0.41), showing that the food partitioning between species was larger in this period. KEYWORDS. Diet, Moenkhausia dichroura, M. sanctaefilomenae, coexistence.RESUMO. Esse estudo avaliou sazonalmente a dieta de Moenkhausia dichroura (Kner, 1858) e M. sanctaefilomenae (Steindachner, 1907), coletadas em simpatria no riacho Cancela, Mato Grosso, Brasil. Independente do período hidrológico, alimentos de origem alóctone predominaram na dieta de ambas as espécies (>50% do total de itens consumidos), sendo insetos terrestres o recurso principal, embora, para M. dichroura insetos aquáticos tenham contribuído na dieta também. Hymenoptera (Formicidae) foi o alimento mais consumido, sendo ambas as espécies caracterizadas como insetívoras terrestres. A dieta restrita dessas espécies é confirmada pelos baixos valores de amplitude de nicho trófico: Ba=0,26 para M. dichroura em ambos os períodos e Ba=0,41 no período de seca e 0,38 no período de chuva, para M. sanctaefilomenae. A sobreposição alimentar foi elevada no período de chuva (O jk =0,75) e apresentou valor intermediário no período de seca (O jk =0,41), evidenciando maior partilha do alimento entre as espécies neste período. PALAVRAS-CHAVE.Dieta, Moenkhausia dichroura, M. sanctaefilomenae, coexistência.

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“…Plant material is a relatively poor-quality resource, containing a relatively high ratio of carbon to nitrogen (Garman 1992). Animal detritus appears to benefit consumers through a rapid release of nutrients, ease of direct ingestion by consumers (Yee and Juliano 2006), and greater concentration of nutrients (Garman 1991;Cloe and Garman 1996;Nakano et al 1999;Henschel et al 2001). These results suggest that animal detritus is indeed a higher quality resource for invertebrates.…”

Section: Discussionmentioning

confidence: 99%

“…Inputs of terrestrial plant detritus to aquatic systems have been well studied (Cloe and Garman 1996). Plant-derived detritus usually must pass through decomposer trophic levels before its energy is available to higher trophic levels, while detritus from animal sources (e.g., terrestrial invertebrates) is likely to be more available for direct ingestion by consumers (Mason and MacDonald 1982;Garman 1991). A more efficient transfer of animal-versus plant-derived energy has been suggested for top consumers in streams (e.g., fish; see Garman 1991;Cloe and Garman 1996;Nakano et al 1999) and for the most common consumer in water-filled tree holes (Yee and Juliano 2006).…”

Section: Introductionmentioning

confidence: 99%

Abundance matters: a field experiment testing the more individuals hypothesis for richness–productivity relationships

Yee

Juliano

2007

Oecologia

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The more individuals hypothesis (MIH) postulates that productivity increases species richness by increasing mean equilibrium population size, thereby reducing the probability of local extinction. We tested the MIH for invertebrates colonizing microcosms that simulated tree holes by manipulating productivity through additions of leaf or animal detritus and subsequently determining the relationships among richness, total abundance, abundance per species, and measures of productivity. We quantified productivity as the rate of microorganism protein synthesis, microorganism metabolic rate, nutrient ion concentration, and type and amount of detritus. Microcosms with animal detritus attracted more species, more individuals per species, and more total individuals than did microcosms with similar amounts of leaf detritus. Relationships between richness or abundance and productivity varied with date. Richness in June increased as a linear function of productivity, whereas the power function predicted by the MIH fit best in July. Abundance in June and July was best described by a power function of productivity, but the linear function predicted by the MIH fit best in September. Abundance per species was best described by a power function of productivity in June and July. Path analysis showed that the indirect effect of productivity through abundance on richness that is predicted by MIH was important in all months, and that direct links between productivity and richness were unnecessary. Our results support many of the predictions of the MIH, but they also suggest that the effects of abundance on richness may be more complex than expected.

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Use of terrestrial arthropod prey by a stream-dwelling cyprinid fish

Cited by 62 publications

References 26 publications

How does diet influence the reproductive seasonality of tropical freshwater fish?: A case study of a characin in a tropical mountain river

How does diet influence the reproductive seasonality of tropical freshwater fish?: A case study of a characin in a tropical mountain river

Uso do alimento por duas espécies simpátricas de Moenkhausia (Characiformes, Characidae) em um riacho da Região Centro-Oeste do Brasil

Abundance matters: a field experiment testing the more individuals hypothesis for richness–productivity relationships

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