Could we consider a single stock when spatial sub-units present lasting patterns in growth and asynchrony in cohort densities? A flatfish case study

Randon, Marine; Réveillac, Elodie; Rivot, Étienne; Pontavice, Hubert du; Pape, Olivier Le

doi:10.1016/j.seares.2018.09.012

Cited by 10 publications

(18 citation statements)

References 80 publications

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“…Our results provide evidence of low connectivity among common sole subpopulations within the EEC, and no inputs from the adjacent spatial management areas. This evidence of local segregation is consistent with recent studies using patterns in key life history traits (Du Pontavice et al 2018;Randon et al 2018) for the common sole in the EEC.…”

Section: Discussionsupporting

confidence: 91%

“…Here we demonstrate very low exchanges between the three delineated EEC areas, and virtually no immigration from adjacent stocks. This demographic isolation is consistent with the marked discrepancies in growth between the areas (Du Pontavice et al 2018;Randon et al 2018) and the lasting synchrony among density-at-age time series inside each area (Randon et al 2018).…”

Section: Combining Different Approaches To Improve Estimates Of Connesupporting

confidence: 80%

“…These natural barriers consist of deep gravel grounds, which occur centrally in the EEC (separating UK from FrW & FrE), and wide rocky reefs from the coasts out into deeper waters (separating FrW from FrE). These natural delineations could potentially define the spatial structure of the common sole population within the EEC and have recently been used to study its connectivity in the EEC (Du Pontavice et al 2018;Randon et al 2018).…”

Section: Spatial Structurementioning

confidence: 99%

“…Otoliths are also extensively used in connectivity studies, either through otolith morphology (Bacha et al 2016;Hüssy et al 2016;Mahe et al 2016) or otolith chemistry (Tanner et al 2016;Callicó Fortunato et al 2017;Régnier et al 2017;Moreira et al 2018). Morphometry and meristics (Allaya et al 2016;Sley et al 2016), parasites (Catalano et al 2014;MacKenzie & Abaunza 2014) and life history traits Erlandsson et al 2017;Du Pontavice et al 2018;Randon et al 2018) have also been used to assess stock structure. In the past decade, stock delineation studies have resulted in revised stock boundaries for numerous stocks (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Observed contrast in key life history traits (density-at-age and length-at-age data) have suggested potential spatial structuring within the adult component of the EEC common sole stock within three discrete spatial areas (Du Pontavice et al 2018;Randon et al 2018). However, the movements of adult sole between these areas remain largely unknown.…”

Section: Introductionmentioning

confidence: 99%

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State-space modeling of multidecadal mark–recapture data reveals low adult dispersal in a nursery-dependent fish metapopulation

Lecomte

Pape

Baillif

et al. 2020

Can. J. Fish. Aquat. Sci.

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Quantifying connectivity within fish metapopulations is an important component in understanding population dynamics and providing an evidence base for assessment and management. We investigate metapopulation connectivity of the common sole (Solea solea) in the Eastern English Channel (EEC). The EEC common sole stock is currently assessed as a single and spatially homogeneous population, but connectivity induced through adult movements within this stock and with nearby stocks remains unknown. To fill this knowledge gap, we developed a state-space mark–recovery model, designed to estimate adult connectivity using mark–recapture data from multiple release experiments from 1970 to 2018 across the EEC and adjacent management areas. The model estimates seasonal fish movements between five predefined areas, Western English Channel, Eastern English Channel (split into three discrete sub-areas), and North Sea. Over 32 000 fish were tagged, 4036 of which were recovered via fisheries. Our results suggest minimal large-scale adult movements between these areas; movements among spatial units within the EEC were very low with even lower levels of immigration from areas adjoining the EEC. Our results support the hypothesis of segregated populations within the EEC. The importance of accommodating population substructure in the fisheries management is considered.

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Section: Discussionsupporting

confidence: 91%