The importance of life stage to population connectivity in whiting (Merlangius merlangus) from the northern European shelf

Tobin, Declan; Wright, Peter J.; Gibb, Fiona M.; Gibb, Iain M.

doi:10.1007/s00227-009-1387-7

Cited by 25 publications

(33 citation statements)

References 52 publications

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“…The trace elements obtained in this study (Sr, Ba, Mn, Mg, Ni and Li) were within the range of concentrations reported for other related coastal marine fish species (Jónsdóttir et al 2006;Gibb et al 2007;Tobin et al 2010). The incorporation of trace elements into otolith structure is a complex process which is still not fully studied and understood, but we know that several abiotic (e.g.…”

Section: Discussionsupporting

confidence: 84%

Discrimination ofTrisopterus luscusstocks in northern Portugal using otolith elemental fingerprints

Silva

Santos

Correia

2011

Aquat. Living Resour.

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-The pout, Trisopterus luscus, is one of the most important gadoid fish captured by northern Portuguese traditional fisheries. In spite of a substantial decrease in fish catches, little data are available either on the population structure or on the management of the species. In this study, chemical analysis with inductively coupled plasma mass spectrometry of whole otoliths of 90 pouts (age group 2, total length: 17.9-25.0 cm) provided location-specific elemental signatures. Sampling took place in shallow waters along the coastline in three fishing grounds off the Portuguese north coast (Viana do Castelo, Matosinhos and Aveiro) between February and March 2010. Otolith fingerprint analysis detected the presence of several informative trace elements. Molar concentrations for each site were analysed through uni-and multivariate statistical tests. Strontium, barium, magnesium and lithium (Sr, Ba, Mg and Li) differed significantly among locations, while no significant differences were found for manganese (Mn) and nickel (Ni). Canonical analysis allowed us to discriminate the tested individuals with respect to their sampling origin with a mean classification accuracy of 69%. The observed site-specific elemental differences in pout otoliths suggest a high level of site-fidelity in relation to their growing/feeding areas. Pouts from these locations can be regarded as a single, although not necessary homogenous, stock. Furthermore, this study also suggests that the populations of juvenile fish mix partially and, therefore, cannot be assumed to be separate units for fisheries management purposes.

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Section: Discussionsupporting

confidence: 84%

Discrimination ofTrisopterus luscusstocks in northern Portugal using otolith elemental fingerprints

Silva

Santos

Correia

2011

Aquat. Living Resour.

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“…In particular, tag-recapture studies have indicated that Clyde cod are a resident population (Wright et al, 2006) subject to very low immigration (Brander, 1975;Connolly and Officer, 2001). Although whiting eggs and juveniles from the Scottish west coast mix into the North Sea, the exchange of adults is limited (Tobin et al, 2010), so west of Scotland whiting should be treated as a distinct population within which the Clyde estuary contains the greatest density of new recruits (de Castro et al, 2013). Differences in length-based indices also suggest that the Clyde demersal community is sufficiently isolated from neighbouring regions to display independent local responses to exploitation and, potentially, also to environmental fluctuations (Heath and Speirs, 2012).…”

Section: Distinctness Of the Clyde Populationsmentioning

confidence: 95%

Fishery-induced changes to age and length dependent maturation schedules of three demersal fish species in the Firth of Clyde

2015

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Probabilistic maturation reaction norms (PMRNs) were used to investigate the maturation schedules of cod, haddock and whiting in the Firth Clyde to determine if typical lengths at maturation have changed significantly since 1986. Some potential sources of growth-independent plasticity were accounted for by including sea-surface temperature and abundance variables in the analysis. The PMRNs of the Clyde populations were compared with those from the wider west coast, in conjunction with regional differences in the fishery, to assess whether fishing may have been driving the observed trends of decreasing lengths at maturation. The lengths at which haddock, whiting and female cod were likely to mature decreased significantly during 1986-2009, with rates of change being particularly rapid in the Clyde. It was not possible to estimate PMRNs for male cod due to limited data. Trends in temperature and abundance were shown to have only marginal affects upon PMRN positions, so temporal trends in maturation schedules appear to have been due to a combination of plastic responses to other environmental variables and/or fishing. Regional differences in fishing intensity and the size-selectivity of the fisheries suggest that the decreases in lengths at maturation have been at least partially due to fishing. The importance and scale of the Clyde Nephrops fishery increased as demersal landings declined, and the majority of demersal fish landings have come from Nephrops bycatch since about 2005 when the demersal fishery ceased. Since it appears as though fishing may have caused increasingly early maturation, and a substantial Nephrops fishery continues to operate in the Clyde, reversal of these changes is likely to take a long time – particularly if there is an evolutionary component to the trends. If size-selective fishing has contributed to the lowered abundance of large fish by encouraging maturation at increasingly small lengths, then large fish may remain uncommon in the Clyde until the observed trends in maturation lengths reverse

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“…The degree of connectivity influences the ecology and evolution of the species, including population growth, resilience to disturbance and rates of divergence and adaptation (Berry et al, 2012a;Botsford et al, 2009;Cowen and Sponaugle, 2009;D'Aloia et al, 2013), and is therefore of fundamental practical and theoretical importance (Curley et al, 2013;Selkoe and Toonen, 2011;Treml et al, 2008). In marine invertebrates and fishes, it is especially important to understand the life-cycle stage(s) at which connectivity occurs (Berry et al, 2012b;Frisk et al, 2013;Tobin et al, 2010) because the demographic implications will vary greatly according to whether dispersal occurs during the egg/larval, juvenile and/or adult stages (Botsford et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Pelagic early life stages promote connectivity in the demersal labrid Choerodon rubescens

Gardner

Chaplin

Potter

et al. 2015

Journal of Experimental Marine Biology and Ecology

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Population connectivity has profound ecological and evolutionary implications. In marine species with complex life cycles, the nature of these implications depends on both the amount of dispersal and the life-cycle stage(s) through which dispersal occurs. For demersal fishes with such life cycles, the pelagic early life stages (ELS) are generally considered the main dispersive phase, though this assumption has rarely been tested. This research investigates genetic connectivity in the reef-dwelling labrid Choerodon rubescens, which is a prized eating fish endemic to ca 1200 km of the west coast of Australia. This species has demersal juveniles and adults, and pelagic ELS that are predicted to last about 25-30 days. The aim of the study was to use patterns of variation at 12 microsatellite loci to test the hypothesis that C. rubescens is genetically homogeneous across its main distribution.

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The importance of life stage to population connectivity in whiting (Merlangius merlangus) from the northern European shelf

Cited by 25 publications

References 52 publications

Discrimination ofTrisopterus luscusstocks in northern Portugal using otolith elemental fingerprints

Discrimination ofTrisopterus luscusstocks in northern Portugal using otolith elemental fingerprints

Fishery-induced changes to age and length dependent maturation schedules of three demersal fish species in the Firth of Clyde

Pelagic early life stages promote connectivity in the demersal labrid Choerodon rubescens

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