Distribution patterns of native freshwater fishes in Patagonia (Argentina)

Baigún, Claudio; Ferriz, Ricardo A.

doi:10.1078/1439-6092-00075

Cited by 49 publications

(40 citation statements)

References 23 publications

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“…It is well known that the Patagonian fish fauna richness is lower than that observed in other cold-temperate regions of the southern hemisphere (Baigu´n and Ferriz, 2003). The exotic O. mykiss was the most abundant fish in the sites studied (both density and biomass).…”

Section: Discussionmentioning

confidence: 82%

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Effects of land use on fish assemblages in Patagonian low order streams

Prinzio

Casaux

Miserendino

2009

Ann. Limnol. - Int. J. Lim.

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-We assessed the effects of land use on the structure of stream fish assemblages in Northwest Patagonia, Argentina. To this end, a total of 18 sites distributed in 15 streams were sampled during the low water period. At each site, 26 regional and local scale variables were used to describe the environmental conditions. The macroinvertebrate density, and the composition and abundance of fish were then recorded. Statistical associations between local assemblage structures and environmental variables were quantified by canonical correspondence analyses. The results revealed that, at a regional scale, the fish assemblages were primarily determined by watershed features like altitude and catchment area, and by land use effects (exotic forest and pasture). Assemblage compositions were also related to some local-scale features such as water velocity, food availability (density of benthic macroinvertebrates), instream characteristic and riparian features. Also, the observed fish species richness was low. Overall, exotic salmonids largely dominated in the samples both in numbers of individuals (98.9%) and in biomass (99.9%), whereas native fish (Hatcheria macraei and Odontesthes hatcheri) were scarcely represented. Rainbow trout (Oncorhynchus mykiss) was the most abundant fish, and was present in all streams. Native species were restricted to five streams located in the ecotone between the Andes and the steppe, where salmonids were also present. Salmonids were the only fish at Andean streams which suggest the existence of a strong geographic segregation between native and exotic species. Some aspects related to the incidence of the introduced species in the structure of fish assemblages are discussed.

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Section: Discussionmentioning

confidence: 82%

“…The native fish fauna comprise only 15 species (Baigu´n and Ferriz, 2003), the naked characin (Gymnocharacinus bergii) being the only threatened species in the region (Ortubay and Cussac, 2000). Prior to introduction of trout, most native species were surely much more widespread and abundant than nowadays.…”

Section: Fish Fauna Of Patagoniamentioning

confidence: 99%

Effects of land use on fish assemblages in Patagonian low order streams

Prinzio

Casaux

Miserendino

2009

Ann. Limnol. - Int. J. Lim.

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“…Ferriz (rferriz@macn.gov.ar) Los peces patagónicos de aguas continentales se distribuyen en la Provincia Patagónica dentro de la subregión ictiogeográfica austral sudamericana (López et al, 2003). La ictiofauna de esta provincia se caracteriza por su baja riqueza específica comparada con la fauna de otras regiones templadas del Hemisferio Sur (Ringuelet, 1975;Arratia et al, 1983), que comprende quince especies nativas (Baigún & Ferriz, 2003).…”

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“…En las últimas décadas se ha reconocido una serie de factores, como la introducción de salmónidos y el uso de la tierra, que han producido cambios en la fauna íctica nativa de la Patagonia (Baigún & Ferriz, 2003;Soto et al, 2006;Vargas et al, 2010). Bello & Ubeda (1998) estimaron que nueve (60%) de las especies nativas se encuentran en peligro y recomiendan estudiar específicamente la biología de Hatcheria macraei.…”

Section: ___________________unclassified

Dieta de Hatcheria macraei (Girard, 1855) (Teleostei, Siluriformes, Trichomycteridae) en el rio Chubut, Argentina

Ferriz

2012

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“…1); O. hatcheri in the southwest and O. bonariensis in the north east (Baigún & Ferriz, 2003;Dyer, 2006;Aigo et al, 2008), and both are remarkably tolerant of high salinity levels but not of sea water (Tsuzuki et al, 2000a, b;Gómez & Ferriz, 2001). Genetic data from Sommer et al (2010) indicate that O. hatcheri has a closer relationship with marine species than with O. bonariensis.…”

Section: Introductionmentioning

confidence: 99%

Populations of Odontesthes (Teleostei: Atheriniformes) in the Andean region of Southern South America: body shape and hybrid individuals

et al. 2015

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The original distribution area of the Patagonian 'pejerrey' Odontesthes hatcheri has been subjected to the introduction of a related species; the Bonaerensean 'pejerrey' Odontesthes bonariensis. This species currently coexists with O. hatcheri in lakes and reservoirs, and can interbreed and produce fertile hybrid offspring. The purposes of this study were; a) the extensive sampling of Patagonian and Andean-Cuyan populations of pejerrey, b) the species identification according to taxonomic key, c) validation of taxonomic results on the basis of mitochondrial DNA composition, and d) applying morphometric analysis to explore the effects of hybridization and environmental conditions on body shape. Cytochrome b sequence analysis showed a high degree of genetic divergence between species and low intraspecific variation in O. hatcheri. Geometric Morphometric Analyses detected shape differences in agreement with diagnostic characteristics of each species. Putative hybrids exhibiting intermediate diagnostic characteristics were identified by Geometric Morphometric Analysis. Significant regressions between body shape and total phosphorus and altitude were found, suggesting a dependence on trophic web structure. This multi-level approach suggests the introgression of O. bonariensis into several O. hatcheri populations throughout Patagonia. Managers should take this into account when considering further exotic introductions into regions where non-native fishes have not yet become established.La distribución original del 'pejerrey' patagónico Odontesthes hatcheri ha sido sometida en las últimas décadas a la introducción de una especie relacionada; el 'pejerrey' Bonaerense Odontesthes bonariensis. Ambas especies coexisten actualmente en algunos lagos y embalses debido a prácticas de siembra y pueden cruzarse y producir progenie híbrida y fértil. Los propósitos de este estudio fueron a) un amplio muestreo de las poblaciones patagónicas y andino-cuyanas del pejerrey, b) la identificación de las especies de acuerdo con la clave taxonómica, c) la validación de los resultados taxonómicos sobre la base de la composición del ADN mitocondrial y d) aplicar el análisis morfométrico para explorar los efectos de la hibridización y las condiciones ambientales sobre la forma corporal. El análisis de la secuencia del Citocromo b mostró un alto grado de divergencia genética entre ambas especies y una muy baja variación intraespecífica en O. hatcheri. El análisis de la Morfometría Geométrica detectó diferencias de forma coincidentes con las características diagnósticas de cada especie. Presuntos híbridos exhibiendo características diagnósticas intermedias fueron identificados por el análisis de la Morfometría Geométrica. Regresiones significativas entre la forma corporal y la concentración total de fósforo y la altitud fueron halladas, sugiriendo una dependencia con la estructura de la trama trófica. Este enfoque múltiple sugiere la introgresión de genes de O. bonariensis dentro de varias poblaciones de O. hatcheri a lo largo de la Patagonia....

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Distribution patterns of native freshwater fishes in Patagonia (Argentina)

Cited by 49 publications

References 23 publications

Effects of land use on fish assemblages in Patagonian low order streams

Effects of land use on fish assemblages in Patagonian low order streams

Dieta de Hatcheria macraei (Girard, 1855) (Teleostei, Siluriformes, Trichomycteridae) en el rio Chubut, Argentina

Populations of Odontesthes (Teleostei: Atheriniformes) in the Andean region of Southern South America: body shape and hybrid individuals

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