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dc.contributor.author
Di Prinzio, Cecilia Yanina
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dc.contributor.author
Omad, Guillermo Hugo
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dc.contributor.author
Miserendino, Maria Laura
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dc.contributor.author
Casaux, Ricardo Jorge
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dc.date.available
2016-05-10T20:34:52Z
dc.date.issued
2015-02
dc.identifier.citation
Di Prinzio, Cecilia Yanina; Omad, Guillermo Hugo; Miserendino, Maria Laura; Casaux, Ricardo Jorge; Selective foraging by non-native rainbow trout on invertebrates in Patagonian streams in Argentina; Springer; Zoological Studies; 54; 29; 2-2015; 1-14
dc.identifier.issn
1021-5506
dc.identifier.uri
http://hdl.handle.net/11336/5607
dc.description.abstract
Background
It is well known that fish predation alters ecosystem processes by top-down effects. Salmonids are described as aggressive, visually and size-selective predators. Thus, prey selection by the non-native rainbow trout was examined on a seasonal basis at two streams: Nant y Fall (NyF) and Cabeza de Vaca (CVA) at Patagonia, a region where this kind of information is lacking.
Results
The benthos density at NyF was higher than that at CVA, and at both streams, riffles supported higher macroinvertebrate densities than pools. The diet of trouts from both streams was dominated by aquatic macroinvertebrates, was diverse, and was varied seasonally. The individuals represented in the stomach contents were among the largest available at the streams. Diet diversity peaked during spring at NyF and during summer at CVA, whereas at both streams, the niche width peaked during spring.
Prey selectivity varied seasonally. The selected preys included both aquatic (Gasteropoda, Crustacea, Plecoptera, Trichoptera, Ephemeroptera, Coleoptera, Diptera, and Odonata) and terrestrial organisms (adult dipterans, Oligochaeta, Araneae, Homoptera, Hymenoptera, Orthoptera, and Hemiptera). Some infaunal invertebrates like oligochaetes and some small Coleoptera and Diptera larvae (mainly Chironomidae) were not selected by trouts.
Conclusions
Despite of the overall dominance of trichopteran species, the composition of the diet of the rainbow trout varied seasonally. This fish positively selected both aquatic and terrestrial organisms. We observed that in both streams, trouts consumed the larger individuals available in those environments.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
Selective Predation
dc.subject
Non-Native Fish
dc.subject
Stream
dc.subject
Patagonia
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
Selective foraging by non-native rainbow trout on invertebrates in Patagonian streams in Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-04-28T14:52:14Z
dc.journal.volume
54
dc.journal.number
29
dc.journal.pagination
1-14
dc.journal.pais
Alemania
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dc.journal.ciudad
Berlín
dc.description.fil
Fil: Di Prinzio, Cecilia Yanina. Universidad Nacional de la Patagonia "san Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Departamento de Biología. Laboratorio de Investigaciones En Ecología y Sistemática Animal; Argentina
dc.description.fil
Fil: Omad, Guillermo Hugo. Universidad Nacional de la Patagonia "san Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Departamento de Biología. Laboratorio de Investigaciones En Ecología y Sistemática Animal; Argentina
dc.description.fil
Fil: Miserendino, Maria Laura. Universidad Nacional de la Patagonia "san Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Departamento de Biología. Laboratorio de Investigaciones En Ecología y Sistemática Animal; Argentina
dc.description.fil
Fil: Casaux, Ricardo Jorge. Universidad Nacional de la Patagonia "san Juan Bosco". Facultad de Ciencias Naturales - Sede Esquel. Departamento de Biología. Laboratorio de Investigaciones En Ecología y Sistemática Animal; Argentina
dc.journal.title
Zoological Studies
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://link.springer.com/article/10.1186/s40555-015-0108-9
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/10.1186/s40555-015-0108-9
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1186/s40555-015-0108-9
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