Divergent trends in anadromous salmonid populations in Norwegian and Scottish rivers

Vøllestad, Leif Asbjørn; Hirst, D.; L’Abée-Lund, Jan Henning; Armstrong, J. D.; MacLean, Julian C.; Youngson, A. F.; Stenseth, Nils Chr.

doi:10.1098/rspb.2008.1600

Cited by 31 publications

(25 citation statements)

References 28 publications

(32 reference statements)

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“…The spatial distribution of correlation coefficients is highly structured, and provides estimates of location that are consistent with known salmon feeding grounds and migration patterns3538475253. The largest contiguous areas of highest correlations, and thus most likely feeding areas, for both the 1SW and MSW components of the NE Coast mixed stock are found in the Norwegian Sea.…”

Section: Resultsmentioning

confidence: 83%

Locations of marine animals revealed by carbon isotopes

MacKenzie

Palmer

Moore

et al. 2011

Sci Rep

103

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Knowing the distribution of marine animals is central to understanding climatic and other environmental influences on population ecology. This information has proven difficult to gain through capture-based methods biased by capture location. Here we show that marine location can be inferred from animal tissues. As the carbon isotope composition of animal tissues varies with sea surface temperature, marine location can be identified by matching time series of carbon isotopes measured in tissues to sea surface temperature records. Applying this technique to populations of Atlantic salmon (Salmo salar L.) produces isotopically-derived maps of oceanic feeding grounds, consistent with the current understanding of salmon migrations, that additionally reveal geographic segregation in feeding grounds between individual philopatric populations and age-classes. Carbon isotope ratios can be used to identify the location of open ocean feeding grounds for any pelagic animals for which tissue archives and matching records of sea surface temperature are available.

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Section: Resultsmentioning

confidence: 83%

Locations of marine animals revealed by carbon isotopes

MacKenzie

Palmer

Moore

et al. 2011

Sci Rep

103

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“…; Vøllestad et al. ) and land use (Jonsson et al. ) have been shown to influence populations of Atlantic salmonids.…”

Section: Introductionmentioning

confidence: 99%

Linking watershed and microhabitat characteristics: effects on production of Atlantic salmonids (Salmo salar and Salmo trutta)

Foldvik

Einum

Finstad

et al. 2016

Ecology of Freshwater Fish

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The spatial scale of environmental factors influencing population dynamics ranges from microhabitat to continental or even global scales. Integration of multiple spatial scales is important in order to understand links between environmental variation and population processes. In the present study, we investigate how multiscale drivers influence the production of stream‐rearing Atlantic salmonids (Atlantic salmon, Salmo salar L. and brown trout, Salmo trutta L.) measured in terms of abundance. Variation in juvenile production was studied using data from single‐pass electrofishing surveys (measured as biomass per m2) from nine rivers. These data were combined with habitat data ranging from an important in‐stream microhabitat variable (shelter availability) to properties of the catchment. Variation in productivity within and among rivers was affected by both properties of in‐stream habitat and catchment properties. Shelter availability and the proportion of the catchment consisting of cultivated land and lakes influenced biomass positively, while catchment area had the opposite effect. For a different set of rivers (N = 20), river gradient and catchment area were shown to positively affect the amount of shelter. Finally, the variables identified in the two preceding analysis were included in the analysis of population productivity using catch statistics from 160 rivers. The proportion of cultivated land and lakes, estimated shelter availability were found to have positive effects. In addition, temperature had a positive effect, while river width had a negative effect. This study shows that combining multiple‐scale environmental factors can explain a substantial proportion of variation in population productivity among and within the populations of Atlantic salmonids.

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“…A study by Penston & Davies (2009) found that numbers of gravid females on fish farms correlated with the numbers of copepodids in surrounding waters. An increase in sea lice abundance has been linked to an increase in marine mortality of migratory salmonids, and marine salmon farming activities on Scotland's west coast have been implicated as an important contributory factor (Butler 2002, Penston et al 2004, Vøllestad et al 2009, Middlemas et al 2010, Middlemas & Armstrong 2012.…”

Section: Introductionmentioning

confidence: 99%