Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 418799
Title Anchovy population expansion in the North Sea
Author(s) Petitgas, P.; Alheit, J.; Peck, A.; Raab, K.E.; Irigoien, X.; Huret, M.; Kooij, J. van; Pohlmann, T.; Wagner, C.; Zarraonaindia, I.; Dickey-Collas, M.
Source Marine Ecology Progress Series 444 (2012). - ISSN 0171-8630 - p. 1 - 13.
DOI https://doi.org/10.3354/meps09451
Department(s) IMARES
IMARES Visserij
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) engraulis-encrasicolus l. - multilocus genotype data - european anchovy - climate-change - fish populations - regime shifts - pelagic fish - wadden sea - atlantic - biscay
Abstract The abundance and spatial occupation of European anchovy Engraulis encrasicolus have increased in the North Sea since the mid-1990s. We use a cross-disciplinary approach combining genetics, transport modelling, survey time series analyses and physical oceanographic modelling to investigate 3 ­hypotheses on the reasons for this change. Evidence from connectivity studies suggests that the population of North Sea anchovy is separate from that in the Bay of Biscay. The recruitment pulses observed in survey data fit a life cycle which includes spawning in early summer and larval development in late summer. This also supports the concept of population expansion originating from local remnant population(s). In terms of growth physiology, suitable thermal windows have expanded, making conditions more favourable for life cycle closure and population persistence/productivity. In addition to the increased frequency of warm summers, which favour larvae and juvenile growth, the decrease in the number of severe winters is also likely to improve overwinter survival. Overall, the evidence supports the hypothesis that the increase in anchovy abundance originated from the improved productivity of existing populations. This increase was associated with an expansion in thermal habitats and is probably not due to a northward shift in the distribution of southern conspecifics.
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