The complete history of salmonid introductions in the Kerguelen Islands, Southern Ocean

Lecomte, Frédéric; Beall, Edward; Chat, Joëlle; Davaine, Patrick; Gaudin, Philippe

doi:10.1007/s00300-012-1281-5

Cited by 35 publications

(44 citation statements)

References 60 publications

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“…This salmonid has been introduced all around the world as far as the sub-Antarctic Kerguelen Islands, Oceania, central Africa, and South and North America (Lecomte, Beall, Chat, Davaine, & Gaudin, 2013). This salmonid has been introduced all around the world as far as the sub-Antarctic Kerguelen Islands, Oceania, central Africa, and South and North America (Lecomte, Beall, Chat, Davaine, & Gaudin, 2013).…”

Section: Introductionmentioning

confidence: 99%

Life history and genetic characterisation of sea troutSalmo truttain the Adriatic Sea

et al. 2019

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The brown trout Salmo trutta is characterised by both anadromous (sea trout)and resident populations, naturally occurring in Atlantic and Ponto-Caspian rivers. Sea trout are currently considered absent from rivers of the Mediterranean area, probably because of the non-optimal chemical-physical characteristics of the Mediterranean Sea. However, the occasional bycatch of smoltified S. trutta in the Adriatic Sea is well known among fishermen and the biological explanation of this phenomenon is still controversial. The aim of this study was to compare the genetic diversity of freshwater and marine brown trout to try to understand the factors underlying the presence of putative anadromous brown trout in the Adriatic Sea.2. In this study, we analysed the genetic diversity of: (1) wild brown trout collected from the Esino River (central Italy); (2) a domestic strain of brown trout used for stocking the study area; and (3) a sample of Adriatic sea trout collected near the outlet of the Esino River. Together with genetic analysis, we carried out scale analysis in order to track the freshwater/marine stages of the life cycle in the sea trout samples. The genetic characterisation was carried out by polymerase chain reaction-restriction fragment length polymorphism analysis of the mtDNA fragment ND-5/6 and the nuclear locus LDH-C1* and by genotyping 15 microsatellite loci. The genetic polymorphism obtained was used to investigate intra-and inter-population genetic diversity, rates of genetic introgression between wild and domestic samples and the origin of sea trout specimens by using assignment tests.3. Our genetic analyses demonstrated that the sea trout analysed in this study are from the domestic strain of Atlantic origin used in central Italy for stocking activities. The level of genetic introgression between native and domestic samples is high in the Esino River. The populations more resilient to introgressive hybridisation appeared to be those living in the portion of the river network dominated by carbonate rocks. Assignment tests (GeneClass) suggest the existence of a link between stocking efforts and the freshwater origin of the sea trout. In addition, data obtained from the analysis of scales, size measurement, and sex determination | 461 SPLENDIANI Et AL.

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Section: Introductionmentioning

confidence: 99%

Life history and genetic characterisation of sea troutSalmo truttain the Adriatic Sea

et al. 2019

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“…Striking examples of sea trout-mediated gene flow are found in case of invasion following human-mediated introductions (e.g. Lecomte, Beall, Chat, Davaine, & Gaudin, 2013) or recolonisation of coastal rivers following recurrent local extinctions (e.g. Ostergaard, Hansen, Loeschcke, & Nielsen, 2003).…”

Section: Introductionmentioning

confidence: 99%

Disentangling individual movement between populations from effective dispersal in the facultative anadromous Salmo trutta L.

Masson

Lepais

Manicki

et al. 2017

Ecology of Freshwater Fish

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Gathering information on both individual movement and gene flow is rarely possible when studying dispersal among populations in fish species. It is, however, possible to assess both at a reasonable cost in Salmo trutta L. on the Atlantic coast of Europe where the facultative anadromous species is composed of discrete populations of brown trout residents occupying distinct river systems, but exchanging phenotypically distinguishable sea trout migrants. We performed two kinds of genetic analyses using individual microsatellite genotypes: the stock identification of sea trout entering each corridor and the estimates of effective dispersal through each corridor. We observed that individual movement (nonlocal individuals of each source population ranging from 4% to 35% of the sea trout run) never translates into effective dispersal except in one of four migratory corridors examined. The likely origin of this uniquely detected gene flow event is discussed in the light of well-documented migratory fish management actions undertaken in the past in the studied area. K E Y W O R D Sbrown trout, effective dispersal, homing, sea trout, straying

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“…Freshwater-resident populations are well described (Baglinière & Maisse, 2002;Frost & Brown, 1967;Gosset, Rives, & Labonne, 2006;Jonsson, 1989;). More complex is the ecology of anadromous trout (Harris, 2017;, which occur naturally along the length of the Atlantic coast of Europe from northern Russia to Portugal, Iceland included, and occur as an introduced fish in North and South America, Australia, New Zealand and Kerguelen Islands (Baglinière, 1999;Elliott, 1994;Lecomte, Beall, Chat, Davaine, & Gaudin, 2013; Figure 1). The species is present along the coast of the Black and Caspian-Aral Seas in central Europe (Baglinière, 1999;Elliott, 1994;.…”

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confidence: 99%

Environmental influences on life history strategies in partially anadromous brown trout (Salmo trutta, Salmonidae)

et al. 2019

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This paper reviews the life history of brown trout and factors influencing decisions to migrate. Decisions that maximize fitness appear dependent on size at age. In partly anadromous populations, individuals that attain maturity at the parr stage typically become freshwater resident. For individual fish, the life history is not genetically fixed and can be modified by the previous growth history and energetic state in early life. This phenotypic plasticity may be influenced by epigenetic modifications of the genome. Thus, factors influencing survival and growth determine life‐history decisions. These are intra‐ and interspecific competition, feeding and shelter opportunities in freshwater and salt water, temperature in alternative habitats and flow conditions in running water. Male trout exhibit alternative mating strategies and can spawn as a subordinate sneaker or a dominant competitor. Females do not exhibit alternative mating behaviour. The relationship between growth, size and reproductive success differs between sexes in that females exhibit a higher tendency to migrate than males. Southern populations are sensitive to global warming. In addition, fisheries, aquaculture with increased spreading of salmon lice, introduction of new species, weirs and river regulation, poor water quality and coastal developments all threaten trout populations. The paper summarizes life‐history data from six populations across Europe and ends by presenting new research questions and directions for future research.

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The complete history of salmonid introductions in the Kerguelen Islands, Southern Ocean

Cited by 35 publications

References 60 publications

Life history and genetic characterisation of sea troutSalmo truttain the Adriatic Sea

Life history and genetic characterisation of sea troutSalmo truttain the Adriatic Sea

Disentangling individual movement between populations from effective dispersal in the facultative anadromous Salmo trutta L.

Environmental influences on life history strategies in partially anadromous brown trout (Salmo trutta, Salmonidae)

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