Inter-annual variability of North Sea plaice spawning habitat

Type Article
Date 2010-11
Language English
Author(s) Loots Christophe1, Vaz SandrineORCID1, Koubbi P.2, 3, Planque Benjamin4, Coppin Franck1, Verin Yves1
Affiliation(s) 1 : IFREMER, Lab Ressources Halieut, F-62321 Boulogne, France.
2 : Univ Paris 06, UMR 7093, Lab Oceanog Villefranche, F-06230 Villefranche Sur Mer, France.
3 : CNRS, UMR 7093, LOV, F-06230 Villefranche Sur Mer, France.
4 : Inst Marine Res Tromso, N-9294 Tromso, Norway.
Source Journal Of Sea Research (1385-1101) (Elsevier Science Bv), 2010-11 , Vol. 64 , N. 4 , P. 427-435
DOI 10.1016/j.seares.2010.01.007
WOS© Times Cited 8
Keyword(s) Potential Habitat, Generalised Additive Models, Spawning, Inter-annual Variability, North Sea plaice, Spatial Distribution
Abstract Potential spawning habitat is defined as the area where environmental conditions are suitable for spawning to occur. Spawning adult data from the first quarter (January-March) of the International Bottom Trawl Survey have been used to study the inter-annual variability of the potential spawning habitat of North Sea plaice from 1980 to 2007. Generalised additive models (GAM) were used to create a model that related five environmental variables (depth, bottom temperature and salinity, seabed stress and sediment type) to presence-absence and abundance of spawning adults. Then, the habitat model was applied each year from 1970 to 2007 to predict inter-annual variability of the potential spawning habitat. Predicted responses obtained by GAM for each year were mapped using kriging. A hierarchical classification associated with a correspondence analysis was performed to cluster spawning suitable areas and to determine how they evolved across years. The potential spawning habitat was consistent with historical spawning ground locations described in the literature from eggs surveys. It was also found that the potential spawning habitat varied across years. Suitable areas were located in the southem part of the North Sea and along the eastern coast of England and Scotland in the eighties; they expanded further north from the nineties. Annual survey distributions did not show such northward expansion and remained located in the southern North Sea. This suggests that this species' actual spatial distribution remains stable against changing environmental conditions, and that the potential spawning habitat is not fully occupied. Changes in environmental conditions appear to remain within plaice environmental ranges, meaning that other factors may control the spatial distribution of plaice spawning habitat. (C) 2010 Elsevier B.V. All rights reserved.
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