Relaciones tróficas de Trucha Marrón,<i>Salmo fario</i>Linné, y Trucha Arco Iris,<i>Salmo gairdneri</i>Richardson, (Osteichthyes, Salmoniformes) en un embalse norpatagónico

Ferriz, Ricardo A.

doi:10.1080/01650528809360754

Cited by 8 publications

(5 citation statements)

References 6 publications

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“…A similar diet composition has been described in e.g., American lakes (Rabe 1967), Australian rivers (Pidgeon 1981), an Argentinean reservoir (Ferriz 1988) and Hawaiian streams (Kido et al 1999). Different works have highlighted the opportunistic feeding behaviour of rainbow trout (Artigas et al 1984, Gibson 1988, Ferriz 1994), identical to other salmonids (Vignes 1998), that modify their diet depending on prey availability.…”

Section: Discussionsupporting

confidence: 60%

Spring diet composition of Rainbow Trout, Oncorhynchus mykiss (Walbaum, 1792) in the Urederra River (Spain)

Oscoz

Leunda

Campos

et al. 2005

Ann. Limnol. - Int. J. Lim.

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Section: Discussionsupporting

confidence: 60%

Spring diet composition of Rainbow Trout, Oncorhynchus mykiss (Walbaum, 1792) in the Urederra River (Spain)

Oscoz

Leunda

Campos

et al. 2005

Ann. Limnol. - Int. J. Lim.

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“…Although the high trophic diversity of salmonids and more specialized diets of native fishes observed in Nahuel Huapi lake (Juncos et al, 2014) was evident in the Alicurá Reservoir, we found very low piscivory and benthivory for rainbow trout (c. 5% each). This contrasts with previous studies performed in this reservoir (Macchi et al, 1999), in the two headwater lakes Traful (Vigliano et al, 2008) and Nahuel Huapi (Juncos et al, 2014;Arcagni et al, 2015), in the adjacent Ramos Mexía reservoir (Ferriz, 1988), and in Chilean lakes (Arismendi et al, 2009). Indeed, large zooplankton is the main food item for rainbow trout in Alicurá reservoir (and the second most important for P. trucha), suggesting an in situ shift from past benthivory (Macchi et al, 1999) to present zooplanktivory.…”

Section: Discussioncontrasting

confidence: 76%

Native and exotic fishes in a Patagonian reservoir with rainbow trout cage culture: spatial and trophic resource use

Jodar

Becker

Blasetti³

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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-Although the interactions of exotic salmonids with native Patagonian fishes are well known, little is known about the ecology and impact of farmed fish escapees. Salmonid production in Argentina is largely concentrated in the Alicurá reservoir in north Patagonia, where fish community studies have been scarce. Here, we assess and compare the spatial distribution, body size-condition and diet of the different fish species in this reservoir. Strong vertical segregation was observed between exotic rainbow trout Oncorhynchus mykiss (both escapees and wild), dominating the littoral zone, and native Percichthys trucha which dominate the medium and deep strata. Low piscivory-benthivory and high zooplanktivory were observed for rainbow trout, both traits being uncommon at a regional scale. Escaped farmed rainbow trout (ERT) diet included abundant indigestible items along with wild prey. Higher body condition of P. trucha close to farms, as well as the regionally unprecedented high incidence of Daphnia sp. in the guts of all the species suggest that farm nutrient discharges have had significant impacts. Finally, the high body condition of ERT, together with their wild food diet and the long dispersal distance observed, demonstrate post-escape success, drawing our attention to potential upstream dispersion affecting the biodiversity and fisheries of Patagonian rivers and lakes.Keywords: aquaculture impact / freshwater salmonid / niche segregation / diet / Patagonia Résumé -Poissons indigènes et exotiques dans un réservoir de Patagonie avec aquaculture en cage de truites arc-en-ciel : utilisation des ressources spatiales et trophiques. Bien que les interactions des salmonidés exotiques avec les poissons patagoniens indigènes soient bien connues, on connaît peu l'écologie et l'impact des poissons échappés d'élevage. La production de salmonidés en Argentine est largement concentrée dans le réservoir d'Alicurá dans le nord de la Patagonie, où les études sur les communautés de poissons ont été rares. Ici, nous évaluons et comparons la répartition spatiale, la taille du corps et l'alimentation des différentes espèces de poissons dans ce réservoir. Une ségrégation verticale forte a été observée entre la truite arc-en-ciel exotique Oncorhynchus mykiss (à la fois évadée et sauvage), dominant la zone littorale et Percichthys trucha natif qui domine les couches moyennes et profondes. Un faible comportement piscivore-benthivore et un régime zooplanctivore important ont été observés pour la truite arc-en-ciel, les deux traits étant peu fréquents à l'échelle régionale. Le régime de la truite arc-en-ciel échappée des cages (ERT) comprenait des composés indigestes abondants et des proies sauvages. Un coefficient de condition élevé de P. trucha près des fermes, ainsi que l'incidence locale sans précédent de Daphnia sp. dans les estomacs de toutes les espèces suggère que les rejets de nutriments aquacoles ont eu des impacts importants. Enfin, le bon état corporel des ERT, ainsi que leur régime alimentaire et la longue distance de ...

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“…Macchi et al (1999) showed that salmonids and P. trucha share benthic food resources and also predation on Galaxiidae species. These shared roles have been confirmed in several studies addressing fish diets in Patagonia Ruzzante et al , 2003Logan et al 2000;Milano et al 2002Milano et al , 2006Ferriz 1984Ferriz , 1987Ferriz , 1988Ferriz , 1989Ferriz , 1993Ferriz /94, 1994.…”

Section: Changes In Fish Distributionmentioning

confidence: 74%

Distribution of introduced and native fish in Patagonia (Argentina): patterns and changes in fish assemblages

Aigo

Cussac

Peris

et al. 2008

Rev Fish Biol Fisheries

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The interaction between native fishes and salmonids introduced in Patagonia at the beginning of the 20th Century, developed at the same time as the environmental change. The phenomenon of global warming has led to the formulation of predictions in relation to changes in the distribution of species, in the latitudinal dimension, both at intralacustrine, or small streams levels. The aim of the present work includes three main objectives: a) to compose a general and updated picture of the latitudinal distribution range of native and alien fishes, b) to analyze the historical changes in the relative abundance of Percichthys trucha, Odontesthes sp., and salmonids in lakes and reservoirs, and c) to relate the diversity and relative abundance of native and salmonid fishes to the environmental variables of lakes and reservoirs. We analysed previous records and an ensemble of data about new locations along the northern border of the Patagonian Province. We compared current data about the relative abundance of native fishes and salmonids in lakes and reservoirs, with previous databases (1984)(1985)(1986)(1987). All samplings considered were performed during spring-summer surveys and include relative abundance, as proportions of salmonids, P. trucha, and Odontesthes sp. For the first time, we found changes in fish assemblages from twenty years back up to the present: a significant decline in the relative abundances of salmonids and an increase of P. trucha. We studied the association between the diversity and relative abundance of native and salmonid fishes and the environmental variables of lakes and reservoirs using Canonical Correspondence Analysis. Relative abundance showed mainly geographical cues and the diversity relied largely on morphometric characteristics. Relative abundance and diversity seem to have a common point in the lake area, included into the PAR concept. Native abundance and alien diversity were negatively related with latitude. Greater native diversity was observed in lakes with high PAR compared with salmonids.Historical changes such as southward dispersion, relative abundance changes, and geographical patterns for relative abundance and diversity are basic concepts needed not only in future research but also in management design for Patagonian fish populations.

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Relaciones tróficas de Trucha Marrón,Salmo farioLinné, y Trucha Arco Iris,Salmo gairdneriRichardson, (Osteichthyes, Salmoniformes) en un embalse norpatagónico

Cited by 8 publications

References 6 publications

Spring diet composition of Rainbow Trout, Oncorhynchus mykiss (Walbaum, 1792) in the Urederra River (Spain)

Spring diet composition of Rainbow Trout, Oncorhynchus mykiss (Walbaum, 1792) in the Urederra River (Spain)

Native and exotic fishes in a Patagonian reservoir with rainbow trout cage culture: spatial and trophic resource use

Distribution of introduced and native fish in Patagonia (Argentina): patterns and changes in fish assemblages

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