Competitive interactions between native and exotic salmonids: a combined field and laboratory demonstration

Blanchet, Simon; Loot, Géraldine; Grenouillet, Gaël; Brosse, Sébastien

doi:10.1111/j.1600-0633.2006.00205.x

Cited by 101 publications

(104 citation statements)

References 66 publications

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“…Major environmental factors that influence growth include qualitative and quantitative nutritional availability [2,3], seasonal changes [4], and intra- and inter-specific competition [5,6]. Despite the plethora of environmental factors that may directly or indirectly influence growth rates, quantitative genetics studies investigating the heritability of growth have revealed moderate to high levels of heritability [7,8].…”

Section: Introductionmentioning

confidence: 99%

Growth-related quantitative trait loci in domestic and wild rainbow trout (Oncorhynchus mykiss)

et al. 2010

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BackgroundSomatic growth is a complex process that involves the action and interaction of genes and environment. A number of quantitative trait loci (QTL) previously identified for body weight and condition factor in rainbow trout (Oncorhynchus mykiss), and two other salmonid species, were used to further investigate the genetic architecture of growth-influencing genes in this species. Relationships among previously mapped candidate genes for growth and their co-localization to identified QTL regions are reported. Furthermore, using a comparative genomic analysis of syntenic rainbow trout linkage group clusters to their homologous regions within model teleost species such as zebrafish, stickleback and medaka, inferences were made regarding additional possible candidate genes underlying identified QTL regions.ResultsBody weight (BW) QTL were detected on the majority of rainbow trout linkage groups across 10 parents from 3 strains. However, only 10 linkage groups (i.e., RT-3, -6, -8, -9, -10, -12, -13, -22, -24, -27) possessed QTL regions with chromosome-wide or genome-wide effects across multiple parents. Fewer QTL for condition factor (K) were identified and only six instances of co-localization across families were detected (i.e. RT-9, -15, -16, -23, -27, -31 and RT-2/9 homeologs). Of note, both BW and K QTL co-localize on RT-9 and RT-27. The incidence of epistatic interaction across genomic regions within different female backgrounds was also examined, and although evidence for interaction effects within certain QTL regions were evident, these interactions were few in number and statistically weak. Of interest, however, was the fact that these predominantly occurred within K QTL regions. Currently mapped growth candidate genes are largely congruent with the identified QTL regions. More QTL were detected in male, compared to female parents, with the greatest number evident in an F1 male parent derived from an intercross between domesticated and wild strain of rainbow trout which differed strongly in growth rate.ConclusionsStrain background influences the degree to which QTL effects are evident for growth-related genes. The process of domestication (which primarily selects faster growing fish) may largely reduce the genetic influences on growth-specific phenotypic variation. Although heritabilities have been reported to be relatively high for both BW and K growth traits, the genetic architecture of K phenotypic variation appears less defined (i.e., fewer major contributing QTL regions were identified compared with BW QTL regions).

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Section: Introductionmentioning

confidence: 99%

Growth-related quantitative trait loci in domestic and wild rainbow trout (Oncorhynchus mykiss)

et al. 2010

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“…The most likely reason that model (4) was not supported by the data is because a large number of cutthroat trout fry out-migrate from tributaries, thereby exposing them to competition in the main river and allowing a mechanism by which carrying capacity for cutthroat trout is not segregated into tributary and river components but rather is common to the entire system, as proposed in model (5).…”

Section: Dependence On Cutthroat Trout Tributary Use Strategymentioning

confidence: 88%

“…Competition has been the focus of many studies of interaction between species of different genera that overlap in habitat requirements [5,29,48,64,72]. In nearly all salmonid populations, intra-and inter-specific competition and the resultant density-dependent mortality is greatest between fry emergence and the end of the first winter [9,17,53].…”

Section: Introductionmentioning

confidence: 99%

Modelling competition and hybridization between native cutthroat trout and nonnative rainbow and hybrid trout

Kirk

Battle

Schrader

2009

Journal of Biological Dynamics

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Native salmonid fish have been displaced worldwide by nonnatives through hybridization, competition, and predation, but the dynamics of these factors are poorly understood. We apply stochastic Lotka-Volterra models to the displacement of cutthroat trout by rainbow/hybrid trout in the Snake River, Idaho, USA. Cutthroat trout are susceptible to hybridization in the river but are reproductively isolated in tributaries via removal of migratory rainbow/hybrid spawners at weirs. Based on information-theoretic analysis, population data provide evidence that hybridization was the primary mechanism for cutthroat trout displacement in the first 17 years of the invasion. However, under some parameter values, the data provide evidence for a model in which interaction occurs among fish from both river and tributary subpopulations. This situation is likely to occur when tributary-spawned cutthroat trout out-migrate to the river as fry. The resulting competition with rainbow/hybrid trout can result in the extinction of cutthroat trout even when reproductive segregation is maintained.

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“…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%

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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Competitive interactions between native and exotic salmonids: a combined field and laboratory demonstration

Cited by 101 publications

References 66 publications

Growth-related quantitative trait loci in domestic and wild rainbow trout (Oncorhynchus mykiss)

Growth-related quantitative trait loci in domestic and wild rainbow trout (Oncorhynchus mykiss)

Modelling competition and hybridization between native cutthroat trout and nonnative rainbow and hybrid trout

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

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