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dc.contributor.author
Di Prinzio, Cecilia Yanina
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dc.contributor.author
Casaux, Ricardo Jorge
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dc.date.available
2023-04-20T13:35:37Z
dc.date.issued
2012-06
dc.identifier.citation
Di Prinzio, Cecilia Yanina; Casaux, Ricardo Jorge; Dietary overlap among native and non-native fish in Patagonian low-order streams; EDP Sciences; Annales de Limnologie-International Journal of Limnology; 48; 1; 6-2012; 21-30
dc.identifier.issn
0003-4088
dc.identifier.uri
http://hdl.handle.net/11336/194717
dc.description.abstract
The diet composition and feeding strategy of native and exotic fish species were studied from May 2005 to February 2006 in three Patagonian low-order streams. A total of 464 fish were caught, which belonged to the exotic species Oncorhynchus mykiss (270), Salmo trutta (177) and the native species Hatcheria macraei (17). The analysis of 336 stomach contents indicated that at the individual level, the three species had a generalized feeding strategy based on benthic invertebrates (Plecoptera, Trichoptera, Coleoptera and Diptera). In the three streams, the widest population niches were observed in winter. There was, however, also a slight tendency toward an increased between-phenotype contribution to the niche width in same season, indicating that a small proportion of individuals within the fish populations specialized by predominantly feeding on a few specific prey species. Hence, the wide population niche widths observed throughout the year were partly a result of mixed individual feeding strategies within the populations. The higher diet overlaps were registered between exotics O. mykiss-S. trutta at Glyn and Carbón, and O. mykiss and the native H. macraei at Manguera, but it changed markedly through the year, perhaps depending on temporal changes in food availability suggesting a competitive coexistence of these species. This is mainly related to the fact that both species changed their food preferences in spring and foraged almost exclusively on Aubertoperla illiesi. This implies that in order to reduce the predation risk or the inter-specific competition for food, the fish species might partition the feeding habitats.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ARGENTINA
dc.subject
FEEDING STRATEGIES
dc.subject
HATCHERIA MACRAEI
dc.subject
PATAGONIA
dc.subject
SALMONIDS
dc.subject.classification
Ecología
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dc.subject.classification
Ciencias Biológicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Dietary overlap among native and non-native fish in Patagonian low-order streams
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-04-19T17:26:28Z
dc.journal.volume
48
dc.journal.number
1
dc.journal.pagination
21-30
dc.journal.pais
Francia
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dc.journal.ciudad
Paris
dc.description.fil
Fil: Di Prinzio, Cecilia Yanina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Casaux, Ricardo Jorge. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title
Annales de Limnologie-International Journal of Limnology
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://dx.doi.org/10.1051/limn/2011055
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1051/limn/2011055
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