Temporal and environmental influences on the variation in sea trout (Salmo trutta L.) smolt migration in the Burrishoole system in the west of Ireland from 1971 to 2000

Byrne, Charles J.; Poole, Russell; Dillane, Mary; Rogan, Ger; Whelan, Ken

doi:10.1016/s0165-7836(03)00146-2

Cited by 27 publications

(27 citation statements)

References 22 publications

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“…an early increase in temperature resulted in an early increase in downstream movement. In addition, several long-term studies have observed earlier initiating salmon (Friedland et al, 2003;Kennedy and Crozier, 2010;O'Maoiléidigh et al, 2003) and sea trout (Salmo trutta L.) (Byrne et al, 2004) smolt migrations associated with increasing spring temperatures. The timing of downstream migration of salmon has also been correlated with increased river flow (Allen, 1944;Hesthagen and Gärnäs, 1986;Ősterdahl, 1969).…”

Section: Control Yearsmentioning

confidence: 99%

Some observations on the impact of temperature and low flow on the onset of downstream movement of wild Atlantic salmon, Salmo salar L., smolts

et al. 2012

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Section: Control Yearsmentioning

confidence: 99%

Some observations on the impact of temperature and low flow on the onset of downstream movement of wild Atlantic salmon, Salmo salar L., smolts

et al. 2012

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“…Smolting appears less stringent in brown trout than in Atlantic salmon and does not seem to be an obligatory process for seawater adaptation in this species. Usually, juvenile trout migrate from rivers in spring (March-June in Europe; Byrne, Poole, Dillane, Rogan, & Whelan, 2004;Flaten et al, 2016;, but may also migrate at other times of the year, for example during autumn Jonsson & Jonsson, 2009aPoole et al, 2007;Poole, Whelan, Dillane, Cooke, & Matthews, 1996;Taal et al, 2014;Winter et al, 2016), indicating that the time of seaward migration is highly plastic. Usually, juvenile trout migrate from rivers in spring (March-June in Europe; Byrne, Poole, Dillane, Rogan, & Whelan, 2004;Flaten et al, 2016;, but may also migrate at other times of the year, for example during autumn Jonsson & Jonsson, 2009aPoole et al, 2007;Poole, Whelan, Dillane, Cooke, & Matthews, 1996;Taal et al, 2014;Winter et al, 2016), indicating that the time of seaward migration is highly plastic.…”

Section: Phenotypic Plasticitymentioning

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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“…Most of the catchments are covered in blanket peat and overlie quartzite and schist bedrock. The catchment systems are described as acid oligotrophic and have a low buffering capacity (Byrne et al, 2004). The main land uses are forestry and sheep grazing and the catchments receive an average precipitation of over 2,000 mm per year (Dalton et al, 2010).…”

Section: Study Sites and Characterisationmentioning

confidence: 99%

Diatom assemblages and their associated environmental factors in upland peat forest rivers

O’Driscoll

Eyto

Rodgers

et al. 2012

Ecological Indicators

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The acid-sensitive upland blanket peat catchments are important habitats for diatom assemblages.In this study, the distribution patterns of epilithic diatom assemblages in the streams of upland forested blanket peat in north-west of Ireland are presented and the associated environmental factors are discussed. A total of 43 sites in 16 rivers were sampled. Multivariate analysis highlighted alkalinity and conductivity as the main physicochemical drivers of riverine diatom assemblages. Contrary to expectations nutrients were not found to have a major influence on the diatoms. A major flood event had a significant impact on the diatom assemblage, and one year after the event, long stalked diatom taxa were still largely absent from the river, indicating that floods could be one of the important factors affecting diatom assemblages. However, the ecological status of the affected sites, as determined by the EQR, did not alter from before to after the flood. The results of this study could be applied to similar acid-sensitive upland peat forest catchments and used as the benchmark to assess the impact of forest operations and peat degradation on ecological status.

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Temporal and environmental influences on the variation in sea trout (Salmo trutta L.) smolt migration in the Burrishoole system in the west of Ireland from 1971 to 2000

Cited by 27 publications

References 22 publications

Some observations on the impact of temperature and low flow on the onset of downstream movement of wild Atlantic salmon, Salmo salar L., smolts

Some observations on the impact of temperature and low flow on the onset of downstream movement of wild Atlantic salmon, Salmo salar L., smolts

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

Diatom assemblages and their associated environmental factors in upland peat forest rivers

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