Keywords
diet
trophic niche
peri-urban lakes
Argentine Northeast.
peces
dieta
nicho trófico
lagunas periurbanas
noreste argentino.
How to Cite
Abstract
Fishes display diverse feeding strategies that may undergo modifications through ontogeny or seasonally with ecological implications in the food webs. Even though the significance of fishes as top predators is recognized, the diet of many of them is still scarcely known; especially in fish that inhabit shallow lakes densely vegetated. The aim of this study was to investigate the diet of Characidium rachovii and Pyrrhulina australis of different size classes (I, II and III); during winter and summer, and estimate their trophic niche breadth. The field work was carried out in two shallow lakes fed by rain (Soto and Pampin lake, Corrientes province), from July 2011 to August 2012. The stomach contents of 104 individuals of C. rachovii and 91 specimens of P. australis were examined. Accumulation curve showed that the number of analyzed stomachs was representative for both species. Twenty three food items for C. rachovii and twenty eight for P. australis were recognized in the gut contents. According to the index of relative importance (IRI), both species feed preferably on cladocerans and midges (Chironomidae), and both species showed a large overlap in their diets (85 %), according to Morisita index. However the diversity of food items and the trophic niche breadth of P. australis (1D = 8.86; B = 4.76) were higher than C. rachovii (1D = 3.37; B = 2.25). Significant differences were observed in the diet of three sizes of P. australis (χ2, p < 0.01) and between the sizes I and III of C. rachovii (χ2, p = 0.03). In both species the diversity of food items increased with increasing their size. Between seasons, the diet differences were significant for both species (χ2, p < 0.0001). The high feeding overlap indicates that both species mostly use the same resources. Notwithstanding this, both the number of food items as the diversity and breadth of the trophic niche, suggest that these species use different feeding strategies, C. rachovii showed a trend towards specialization in microcrustacean consumption; while P. australis exhibited a broader trophic spectrum, incorporating insects from littoral areas and from the terrestrial community. The loss of the trophic dominant resource, by increasing urbanization on the margin of the studied shallow lakes, could lead to increased competition, due to the wide diet overlap in both species.
References
Abelha, M. C., Agostinho, A. A., & Goulart, E. (2001). Plasticidade trófica em peixes de água doce. Acta Scientiarum. Biological Sciences, 23, 425-434.
Arias, J. & Rossi, L. (2005). Dieta y estrategia alimentaria de Pyrrhulina australe (Pisces, Lebiasinidae). Revista FABICIB, 9, 197-205.
Barreto, A. P. & Aranha, J. M. R. (2006). Alimentação de quatro espécies de Characiformes de um riacho da Floresta Atlântica, Guaraqueçaba, Paraná, Brasil. Revista Brasileira de Zoologia, 23, 779-788.
Bastos, R. F., Miranda, S. F., & Garcia, A. M. (2013). Dieta e estratégia alimentar de Characidium rachovii (Characiformes, Crenuchidae) em riachos de planície costeira do sul do Brasil. Iheringia, Série Zoologia, Porto Alegre, 103, 335-341.
Bonetto, A. A., Neiff, J. J., Poi de Neiff, A., Varela, M. E., Corrales, M. A., & Zalocar, Y. (1978a). Estudios limnológicos en la cuenca del Riachuelo. III: Laguna Brava. Ecosur, 5, 57-84.
Bonetto, A. A., Roldán, D., & Oliver, M. E. (1978b). Estudios limnológicos en la cuenca del Riachuelo (Corrientes, Argentina). I: Poblaciones de peces en ambientes leníticos y lóticos. Ecosur, 5, 1-15.
Bruniard, E. D. (1999). Los regímenes hídricos de las formaciones vegetales. Aportes para un modelo fotoclimático mundial. Resistencia, Chaco: Editorial Universitaria del Nordeste.
Casciotta, J., Almirón, A., & Bechara, J. (2005). Peces del Iberá - Hábitat y Diversidad. La Plata, Argentina: Editorial Grafikar.
Cetra, M., Rodrigues-Rondineli, G., & Pereira-Souza, U. (2011). Compartilhamento de recursos por duas espécies de peixes nectobentônicas de riachos na bacia do rio Cachoeira (BA). Biota Neotropica, 11, 87-95.
Colwell, R. K. (2006). EstimateS: statistical estimation of species richness and shared species from samples (software and user’s guide). Versión 8.0. Recuperado de http://purl.oclc.org/estimates
Costalago, D., Navarro, J., Álvarez-Calleja, I., & Palomera I. (2012). Ontogenetic and seasonal changes in the feeding habits and trophic levels of two small pelagic fish species. Marine Ecology Progress Series, 460, 169-181.
Dunham, A. E. (1983). Realized niche overlap, resource abundance, and intensity of interespecific competition. In R. B. Huey, E. R. Pianka, & T. W. Schoener (Eds.), Lizard Ecology (pp. 261-280). Cambridge, Massachusets: Harvard University Press.
Fernández, E. M., Ferriz, R. A., Bentos, C. A., & López, G. R. (2012). Dieta y ecomorfología de la ictiofauna del arroyo Manantiales, provincia de Buenos Aires, Argentina. Revista del Museo Argentino de Ciencias Naturales, 14, 1-13.
Fernández, H. R. & Domínguez, E. (2009). Macroinvertebrados bentónicos sudamericanos. Sistemática y Biología. Tucumán, Argentina: Universidad Nacional de Tucumán.
Ferreira-Rezende, C., Mazzoni, R., Pellegrini-Caramaschi, É., Rodrigues, D., & Moraes, M. (2011). Prey selection by two benthic fish species in a Mato Grosso stream, Rio de Janeiro, Brazil. Revista de Biología Tropical, 59, 1697-1706.
Ferriz, R. A., Fernández, E. M., López, G. R., & Bentos, C. A. (2012). Alimentación de Pseudocorynopoma doriai (Pisces: Characidae) en el arroyo El Portugués, provincia de Buenos Aires, Argentina. Revista del Museo Argentino de Ciencias Naturales, 14, 243-251.
Frutos, S. M., Poi de Neiff, A. S. G., & Neiff, J. J. (2009). Zooplankton abundance and species diversity in two lakes with different trophic states (Corrientes, Argentina). Acta Limnologica Brasiliensia, 21, 367-375.
George, E. L., & Hadley, W. F. (1979). Food and habitat partitioning between rock bass (Ambloptides rupestris) and smallmouth bass (Micropterus dolomieu) young of the year. Transaction of American Fisheries Society, 108, 253-257.
Horn, H. S. (1966). Measurement of “overlap” in comparative ecological studies. The American Naturalist, 100, 419-424.
Houde, E. D. (1997). Patterns and consequences of selective processes in teleost early life histories. In C. Chambers & E. A. Trippel (Eds.), Early life history and recruitment in fish populations (pp. 173-196). London: Chapman & Hall.
Hurlbert, S. H. (1978). The measurement of niche overlap and some relatives. Ecology, 59, 67-77.
INTA. (2009). Zonas AgroEconómicas Homogéneas Corrientes. En F. Acosta, L. Giménez, C. Calvi, & M. Richieri (Eds.), Estudios socioeconómicos de la sustentabilidad de los sistemas de producción y recursos naturales (pp. 1-75). Buenos Aires: INTA.
Jost, L. (2006). Entropy and diversity. Oikos, 113, 363-375.
Levins, R. (1968). Evolution in changing environments: some theoretical explorations. New Jersey: Princeton University Press.
Lopez, H. L., Miquelarena, A. M., & Ponte Gómez, J. (2005). Biodiversidad y Distribución de la Ictiofauna Mesopotámica. INSUGEO, Miscelánea, 14, 311-354.
Lopretto, E. & Tell, G. (1995). Ecosistemas de aguas continentales. Metodologías para su estudio. La Plata, Argentina: Ediciones Sur.
Machado-Allison, A. (2005). Los peces de los llanos de Venezuela: un ensayo sobre su historia natural. Caracas, Venezuela: Consejo de Desarrollo Científico y Humanístico.
Mazzoni, R., Marques, P. S., Rezende, C. F., & Iglesias-Rios, R. (2012). Niche enlargement as a consequence of co-existence: a case study. Brazilian Journal of Biology, 72, 267-274.
Meschiatti, A. J., & Arcifa, M. S. (2002). Early life stages of fish and the relationships with zooplankton in a tropical brazilian reservoir: Lake Monte Alegre. Brazilian Journal of Biology, 62, 41-50.
Montori, A. (1991). Alimentación de los adultos de Euproctus asper (Duges 1852) en la montaña media del Prepirineo catalán (España). Revista Española de Herpetología, 5, 23-36.
Neiff, J. J. (2004). El Iberá... ¿en peligro?. Buenos Aires: Fundación Vida Silvestre Argentina.
Paggi, J. C. (2004). Importancia de la fauna de “ Cladóceros ” (Crustácea, Branchiopoda) del Litoral Fluvial Argentino. INSUGEO, Miscelánea, 12, 239-246.
Piet, G. J., Ret, J. S., Guruge, W. A., Vijuever, J., & Van Densen, W. L. (1999). Resource partitioning along three niche dimentions in a size-structured tropical fish assemblege. Canadian Journal of Fisheris and Aquatic Sciences, 56, 1241-1254.
Poi, A. & Galassi, M. E. (2013). Sistema 4b - Humedales del noroeste de Corrientes. En L. Benzaquen, D. Blanco, R. Bo, P. Kandus, G. Lingua, P. Minotti, & L. Vidal (Eds.), Inventario de los humedales de Argentina: sistemas de paisajes de humedales del corredor fluvial Paraná Paraguay (pp. 215-222). Buenos Aires: Secretaría de Ambiente y Desarrollo Sustentable de la Nación.
Poi de Neiff, A. S., Neiff, J. J., Patiño, C. A., Ramos, A. O., Cáceres, J. R., Frutos, S. M., & Verón, C. (1999). Estado trofico de dos lagunas en planicies anegables con areas urbanas de la provincia de Corrientes. FACENA, 15, 93-110.
TspDig. (Version 2.17.) [Computer software] Stony Brook, Department of Ecology and Evolution, State University of New York: Rohlf, J. F.
Román-Valencia, C., Hernández, J. H., & Samudio, H. F. (2007). Sobre Ecología de Characidium caucanum (Pisces: Crenuchidae) en el alto río Cauca, Colombia. Asociación Colombiana de Ictiólogos- DAHLIA, 9, 33-42.
Ross, S. T. (1986). Resource partitioning in fish assemblages: A review of field studies. Copeia, 352-388.
Ruiz-Díaz, F. (2005). Alimentación. En J. Casciotta, A. Almirón, & J. Bechara (Eds.), Peces de Iberá. Hábitat y Diversidad (pp. 41-45). La Plata, Argentina: Editorial Grafikar.
Teixeira de Mello, F., González-Bergonzoni, I., & Loureiro, M. (2011). Peces de agua dulce del Uruguay. Uruguay: PPR-MGAP.
Welcomme, R. L. (1992). Pesca Fluvial (Documento técnico de pesca - 262). Roma: FAO.
Winemiller, K. O. (1989). Ontogenetic diet shifts and resource partitioning among piscivorous fishes in the Venezuelan llanos. Environmental Biology of Fishes, 26, 177-199.
Winemiller, K. O., Agostinho, A. A., & Caramaschi, E. P. (2008). Fish Ecology in Tropical Streams. In D. Dudgeon. (Ed.), Tropical Stream Ecology (pp. 107-146). Amsterdam: Elsevier.
Wootton, R. J. (1999). Ecology of teleost fishes. The Netherlands: Kluwer Academic Publishers.
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