Stable isotope evidence of trophic interactions between introduced brook trout<i>Salvelinus fontinalis</i>and native brown trout<i>Salmo trutta</i>in a mountain stream of south‐west France

Cucherousset, Julien; Aymes, Jean-Christophe; Santoul, Frédéric; Céréghino, Régis

doi:10.1111/j.1095-8649.2007.01675.x

Cited by 65 publications

(81 citation statements)

References 60 publications

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“…Early studies used isotopic similarity to infer consumption of a prey by consumer, more recently isotopic mixing models such as IsoSource (Phillips and Gregg 2003), SIAR (Parnell et al 2008) and mixSIAR (Stock and Semmens 2013) have enabled the calculation of the most likely proportional contribution of multiple food sources to the tissue of a consumer, and hence, dietary composition. The effect of nonnative species on food webs has been studied using stable isotope mixing models to examine both the impact of introducing non-native fish species on other species (Cucherousset et al 2007) and non-native primary producers on both primary consumers (Levin et al 2006) and higher trophic species (Currin et al 2003;Shang et al 2008). Isotopic analysis has advantages over stomach contents analysis in providing dietary information as it provides a more integrated longer term dietary signal reflecting assimilated not merely ingested material (Al-Maslamani et al 2009).…”

Section: Introductionmentioning

confidence: 99%

The effect of water management on extensive aquaculture food webs in the reconstructed wetlands of the Doñana Natural Park, Southern Spain

et al. 2015

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Extensive aquaculture in coastal and estuarine wetlands can support both increased food production and wider ecosystem services when underpinned by effective management to promote productivity and hence food webs that support both commercial species and biodiversity. Changing hydrology, specifically water movement, within wetlands significantly impacts the physico-chemical properties of the water body and hence can be employed to manipulate productivity and alter patterns of recruitment of commercial species and may also transfer non-native species from the supplying water bodies. The reconstructed wetlands of Veta la Palma in the Doñana Natural Park are subjected to either a 1 % or 5 % d -1 water exchange with water drawn from the adjacent Guadalquivir estuary. This site provides an excellent opportunity for examining the effect of water management on the food webs that support both the birdlife and aquaculture activities for which this habitat is managed. Stable isotopes were used to examine food webs in three replicate lagoons under each water management scheme. In lagoons receiving higher water exchange, phytoplankton productivity appeared to be more important than benthic production in supporting food webs. Increased water exchange also changed the shape of the food webs, facilitated the colonisation of at least one non-native species and increased the importance of non-native species in the diets of large commercially harvested fish (> 60 % of seabass diet). Lagoons with high water flows also had between three and four times greater shrimp biomass than those of low flow lagoons. Non-native fauna were opportunistic omnivores, eating marginally more non-natives in lagoons with greater water exchange. Overall non-native cordgrass Spartina densiflora contributed only slightly more to food webs compared with the native reed Phragmites australis, despite the lagoon edge occupancy ratio of 9:1, respectively. Nonnatives also appear to enhance food provision for large predators and wetland birds, by increasing biomass, without competing for resources with native species, supporting the dual management objectives of aquaculture and waterbird conservation.

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Section: Introductionmentioning

confidence: 99%

The effect of water management on extensive aquaculture food webs in the reconstructed wetlands of the Doñana Natural Park, Southern Spain

et al. 2015

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“…In the River Oriège, trophic interactions have also been reported (Cucherousset et al 2007), and the present study now reports the existence of reproductive interactions. Because the genetic stocks of brown trout are considered as tbreatened in many parts of Europe (Almodovar and Nicola 2004), the populations that still remain in headwater streams have high conservation value for the species.…”

Section: Discussionmentioning

confidence: 62%

“…The Oriège River is a torrential stream in the Pyrenees Mountains (South France, 1 °57' E, 42°39' N) that flows into the Ariège River at 815masl (Cucherousset et al 2007). Discharge varies from 1 (winter and summer) to 15m 3 /s (spring thaw), and water temperatures range from 0°C to 13.5°C.…”

Section: Methodsmentioning

confidence: 99%

“…months afterwards (July 2006, June 2007, and September 2007) using a backpack electroshocker (Type EFKO FEG 1500, details in Cucherousset et al 2007). The tiger trout is the well-known hybrid of brown trout and brook trout (Blanc and Chevassus 1979), and hybrids were recognized on the field using coloration and vermiculation (Brown 1966;Allan 1977).…”

Section: Methodsmentioning

confidence: 99%

“…There is evidence of long-term detrimental impact of brook trout on brown trout populations in boreallakes of northem Sweden (Spens et al 2007) and replacement of brown trout by brook trout in headwaters ofFinland (Korsu et al 2007). In South Europe, there is evidence of trophic interactions (Cucherousset et al 2007), but Blanchet et al (2007) suggested that brown trout growth and apparent survival are hardly affected by brook trout, indicating that other mechanisms are responsible. While existence of reproductive interactions and/or hybridization between these species in Europe has been suggested as a potential cause (Korsu et al 2007;Spens et al 2007), it has not been systematically studied.…”

Section: Introductionmentioning

confidence: 99%

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Do native brown trout and non-native brook trout interact reproductively?

Cucherousset

Aymes

Poulet

et al. 2008

Naturwissenschaften

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 10159To link to this article : DOI:10.1007/s00114-008-0370-3 URL : http://dx.doi.org/10.1007/s00114-008-0370-3To cite this version : Cucherousset, Julien and Aymes, J. C. and Poulet, Nicolas and Santoul, Frédéric and Céréghino, Régis. Do native brown trout and non-native brook trout interact reproductively? (2008) Naturwissenschaften, vol. 95 (n° 7). pp. 647-654. ISSN 1432647-654. ISSN -1904 Any correspondance concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr Do native brown trout and non-native brook trout interact reproductively?Abstract Reproductive interactions between native and non-native species of fish have received little attention compared to other types of interactions such as predation or competition for food and habitat. We studied the reproductive interactions between non-native brook trout (Salvelinus fontinalis) and native brown trout (Sa/mo truffa) in a Pyrenees Mountain stream (SW France). We found evidence of significant interspecific interactions owing to consistent spatial and temporal overlap in redd localizations and spawning periods. We observed mixed spawning groups composed of the two species, interspecific subordinate males, and presence of natural hybrids (tiger trout). These reproductive interactions could be detrimental to the reproduction success of both species. Our study shows that non-native species might have detrimental effects on native species via subtle hybridization behavior.

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An alien fish threatens an endangered parasitic bivalve: the relationship between brook trout (Salvelinus fontinalis) and freshwater pearl mussel (Margaritifera margaritifera) in northern Europe

Salonen

Marjomäki

Taskinen

2016

Aquatic Conservation

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Salonen, JouniThe role of salmonid fishes in conservation of the endangered freshwater pearl mussel (Margaritifera margaritifera) Jyväskylä: University of Jyväskylä, 2016, 48 The abundance of freshwater pearl mussels (Margaritifera margaritifera) has declined widely during the past century, and new conservation initiatives are needed. This thesis focused on the relationship between M. margaritifera and its salmonid host required for reproduction of this species. First, by exposing fish experimentally to glochidium larvae of M. margaritifera, different M. margaritifera populations were shown to demonstrate strong differences in their ability to parasitize different salmonid species. Atlantic salmon was clearly a better host for mussels in large river channels, whereas in small headwater tributaries brown trout was the best, or the only suitable, host. These findings provide a previously unrecognised explanation for the collapse and the lack of recruitment especially of the salmon-specific M. margaritifera populations; a high proportion of large salmon rivers were dammed for hydropower production in the 1960s, which prevented the migration of salmon and thus left M. margaritifera without the appropriate host in these rivers. Furthermore, an invasive salmonid, brook trout, was widely introduced to small tributaries above the dams in the past, but in this study was shown to be an unsuitable host for M. margaritifera. Thus, and due to the tendency of brook trout to replace native brown trout, the spread of brook trout is an additional threat to M. margaritifera. An indication of local adaptation of M. margaritifera, i.e. higher infectivity in sympatric salmonid host strain than in allopatric populations of the same species, was also detected. Finally, a new, nondestructive approach to search for M. margaritifera populations, involving electrofishing and quick visual examination of the gills of captured salmonids, revealed the occurrence of 3 previously unknown populations. The results of this thesis highlight the importance of taking into account the roles of salmonid fish in future efforts to search, protect and restore freshwater pearl mussel populations.

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Stable isotope evidence of trophic interactions between introduced brook troutSalvelinus fontinalisand native brown troutSalmo truttain a mountain stream of south‐west France

Cited by 65 publications

References 60 publications

The effect of water management on extensive aquaculture food webs in the reconstructed wetlands of the Doñana Natural Park, Southern Spain

The effect of water management on extensive aquaculture food webs in the reconstructed wetlands of the Doñana Natural Park, Southern Spain

Do native brown trout and non-native brook trout interact reproductively?

An alien fish threatens an endangered parasitic bivalve: the relationship between brook trout (Salvelinus fontinalis) and freshwater pearl mussel (Margaritifera margaritifera) in northern Europe

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