A natural experiment of dietary overlap between introduced Rainbow Trout (Oncorhynchus mykiss) and native Puyen (Galaxias maculatus) in the Santa Cruz River, Patagonia

Tagliaferro, Marina; Arisméndi, Iván; Lancelotti, Julio L.; Pascual, Miguel

doi:10.1007/s10641-014-0360-6

Cited by 20 publications

(14 citation statements)

References 64 publications

(92 reference statements)

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“…Such results corroborate that salmonids are flexible in foraging and interspecific diet Amundsen et al (1996). The upper panel is an explanatory diagram for interpreting feeding tactic, niche width contribution, and prey importance (adapted from Tagliaferro et al, 2015). WFC: within-phenotype component, BPC: between-phenotype component.…”

Section: Discussionsupporting

confidence: 68%

Feeding habits of the alien brook trout Salvelinus fontinalis and the native brown trout Salmo trutta in Czech mountain streams

Horká

Sychrová

Horký

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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-Quantifying patterns of prey resource use is fundamental to identify mechanisms enabling the coexistence of related fish species. Trophic interactions between the native brown trout, Salmo trutta, and the introduced brook trout, Salvelinus fontinalis, were studied monthly from May to October in three mountain streams in Central Europe (Czech Republic). To evaluate whether the feeding habits differ between separated and coexisting populations of these species, one locality where both species coexist, and two allopatric populations of either species were studied. Across the study period, the mean stomach fullness of fish varied, being highest in spring and declining through autumn. The diet overlap (Schoener's overlap index) between the species increased through the studied season (from 54.5% in July to 81.5% in October). In allopatry, both species had nearly the same feeding habits. However, in sympatry, brook trout consumed higher proportion of terrestrial invertebrates, while brown trout showed no changes either in the proportions of aquatic and terrestrial prey utilized or in the selectivity for prey categories in comparison to allopatric conditions. The dietary shift observed for brook trout, but not for brown trout, suggests that brown trout is a stronger competitor in the studied sympatric locality, leading the brook trout to change its feeding habits to reduce interspecific competition.Keywords: feeding behaviour / salmonids / coexistence / overlap / diet Résumé -Habitudes alimentaires de l'omble de fontaine exogène Salvelinus fontinalis et de la truite indigène Salmo trutta dans les ruisseaux de montagne tchèques. La quantification des modes d'utilisation des ressources est essentielle pour identifier les mécanismes permettant la coexistence d'espèces de poissons proches. Les interactions trophiques entre la truite brune indigène, Salmo trutta et l'omble de fontaine introduit, Salvelinus fontinalis, ont été étudiées mensuellement de mai à octobre dans trois cours d'eau de montagne en Europe centrale (République tchèque). Pour évaluer si les habitudes alimentaires diffèrent entre les populations séparées et coexistantes de ces espèces, une localité où les deux espèces coexistent et deux populations allopatriques de l'une ou l'autre espèce ont été étudiées. Au cours de la période étudiée, la plénitude gastrique moyenne des poissons a varié, étant la plus élevée au printemps et diminuant à l'automne. Le chevauchement du régime (indice de chevauchement de Schoener) entre les espèces a augmenté au cours de la saison étudiée (de 54,5 % en juillet à 81,5 % en octobre). En allopatrie, les deux espèces avaient pratiquement les mêmes habitudes alimentaires. Cependant, en sympatrie, l'omble de fontaine a consommé une proportion plus élevée d'invertébrés terrestres, tandis que la truite brune n'a montré aucun changement ni dans les proportions de proies aquatiques et terrestres utilisées ni dans la sélectivité pour les catégories de proies en comparaison aux conditions allopatriques. Le changement de régime...

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Section: Discussionsupporting

confidence: 68%

Feeding habits of the alien brook trout Salvelinus fontinalis and the native brown trout Salmo trutta in Czech mountain streams

Horká

Sychrová

Horký

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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“…Fish in these rivers seem to make extensive use of this productivity that is expressed by diversity of their diets, broad carbon niche space and high proportion of terrestrial items and zooplankton. Puye adults in rivers were previously shown to mainly feed on benthic macroinvertebrates and allochtonous organisms (Ferriz & Aramburu, 1994; Ruiz, 1993; Tagliaferro et al., 2015; Vega et al., 2013). Production of zooplankton in these systems seems to be driven by both floodplain interactions (Catlin et al., 2017, 2019; Górski et al., 2013) and direct inputs from large headwater lakes (Havel et al., 2009; De los Ríos‐Escalante et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Variation of stomach content and isotopic niche of puye Galaxias maculatus (Jenyns, 1842) in large river systems of southern Chile

et al. 2021

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Understanding of trophic structure and flow of energy within river systems is essential for informed management of these ecosystems and conservation of native fish fauna and fisheries resources. Food resources used by riverine fish depend on productivity within the main stem and adjacent floodplains, terrestrial inputs, and longitudinal and lateral hydrologic connectivity. Trophic ecology of puye (Galaxias maculatus Jenyns, 1842) in Chilean river systems remains poorly understood and studies that combine short‐term (stomach content) and long‐term (stable isotope analyses) analyses have not been performed to date. In this study, we assessed spatial variability in diet of puye based on both stomach content and analyses of stable isotopes of carbon and nitrogen in 10 river systems of southern Chile (including main stem, headwater lakes, and estuaries). Fish in the main stems of more northern rivers, with predictable flow regimes, were characterised by the most diverse diets, broad niche space, and high proportion of terrestrial prey items and zooplankton in diet. Fish collected in lakes were characterised by narrow isotopic niche space and diet dominated by zooplankton. Diet of G. maculatus in Chilean river systems is associated with characteristics of riverine habitats within each river system (lentic, lotic, and estuarine) and hydrologic connectivity among them. Indeed, connectivity with floodplain habitats and direct supply from headwater lakes appeared to be primary drivers of fish diet in systems where these are present. These supplies maintain fish populations of good condition and allow freshwater recruitment. Therefore, maintaining seasonal flow dynamics and connectivity is essential to preserve the natural function of these river systems and conserve native fish populations.

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“…We observed generalist diets characterizing several fish species, including black bullhead, green sunfish and smallmouth bass at lowland sites. The high proportion of generalist feeders observed in this study suggests low niche variability for fishes, which may indicate a system that is particularly susceptible to invasion (Tagliaferro et al ., 2015). Green sunfish and smallmouth bass are also known to be successful invaders, but they tend to impact native fishes by preying on juveniles and competing for habitat, rather than through dietary overlap (Carey et al ., 2011; Dentler, 1993; Lemly, 1985; Moyle, 1976; Moyle & Nichols, 1974).…”

Section: Discussionmentioning

confidence: 99%

Dietary specificity and overlap in endorheic river fishes: How do native and nonnative species compare?

Minder

Arsenault

Erdenee

et al. 2020

Journal of Fish Biology

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The introduction of nonnative species is one of the most critical problems facing freshwater systems today. The rivers of the Great Basin (USA) have been particularly imperilled by nonnative species introductions and represent a valuable location to study the dietary trends of native and nonnative fishes in isolated, endorheic systems. We collected fish from 23 sites, spanning three Great Basin watersheds (Carson, Humboldt and Bear Rivers) and two elevation categories (upland and lowland). Only a single species (speckled dace Rhinichthys osculus) occurred in both elevation zones. Diet item analyses of over 500 fish stomachs indicated significant dietary overlaps between native and nonnative fishes and detailed dietary selectivity for all species. This finding, along with the low species diversity observed in the region, suggests low dietary niche diversity, which could have the potential to amplify the competitive impacts of nonnatives on native species. In upland sites, nonnative trouts were the dominant invaders, while in lowland sites warm-water nonnatives were prevalent. The management implications we recommend based on our results urge for continued monitoring of water temperature and species occurrences to predict if dietary overlaps observed in this study are likely to change in the future. Significance Statement: The Great Basin is an ideal endorheic region to study dietary trends in native and nonnative fishes. These trends are important in predicting competitive interactions among fishes. By looking at the diets of fishes within this region we were able to identify multiple significant overlaps among native and nonnative fishes. These results represent a baseline for future studies in the region as well as being comparable to other regions with similar invasive/native overlaps.

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A natural experiment of dietary overlap between introduced Rainbow Trout (Oncorhynchus mykiss) and native Puyen (Galaxias maculatus) in the Santa Cruz River, Patagonia

Abstract: A natural experiment of dietary overlap between introduced Rainbow Trout (Oncorhynchus mykiss) and native Puyen (Galaxias maculatus) in the Santa Cruz River, Patagonia

Cited by 20 publications

References 64 publications

Feeding habits of the alien brook trout Salvelinus fontinalis and the native brown trout Salmo trutta in Czech mountain streams

Feeding habits of the alien brook trout Salvelinus fontinalis and the native brown trout Salmo trutta in Czech mountain streams

Variation of stomach content and isotopic niche of puye Galaxias maculatus (Jenyns, 1842) in large river systems of southern Chile

Dietary specificity and overlap in endorheic river fishes: How do native and nonnative species compare?

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