Image analysis; Mediterranean Sea; Time series; “Typical” year; North Atlantic Oscillation; Climate change
Abstract :
[en] Dynamics of the subsurface (2–3 m) mesozooplankton (i.e., > 200 μm) in the Bay of Calvi (Corsica, France) were explored, combining time series (2004–2016) of 14 zooplankton groups, wind gusts, water temperature, nitrate and chlorophyll-a. Zooplankton data was obtained through image analysis. While contrasted group-specific seasonal patterns were observed, the most productive zooplankton annual event occurred in April (spring peak), concentrating on average 25% of the total annual abundance. A “typical” year was defined based on the annual succession of different community states, highlighting particular years (2007, 2015 and 2012) mainly characterized by weak spring peak. Environmental influences on the interannual variability of zooplankton were explored and while relationship between chlorophyll-a and zooplankton abundance was unclear, the availability of nutrients (December–March), potentially mediated via the wind regime (October–January) seemed to be essential to the occurrence of the spring peak. Additionally, we observed an influence of temperature, with winter thermal thresholds (between 12.1 °C and 13.4 °C) conditioning the spring peak. Also, the occurrence of lower annual abundances after 2010 was synchronous with the sharp increase of seawater warming trend, especially regarding winter temperature (0.30 °C.year-1). Finally, winter North Atlantic Oscillation (NAO) was found to be correlated to both winter water temperature and spring peak abundance, which suggests large-scale processes to impact regional zooplankton community.
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Fullgrabe, Lovina ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Grosjean, P.; Numerical Ecology of Aquatic Systems, Complexys Institute, University of Mons, Mons, 7000, Belgium
Gobert, Sylvie ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Lejeune, Pierre; Station de Recherches Sous-marines et Océanographiques STARESO, Calvi, 20260, France
Leduc, M.; Station de Recherches Sous-marines et Océanographiques STARESO, Calvi, 20260, France
Engels, G.; Numerical Ecology of Aquatic Systems, Complexys Institute, University of Mons, Mons, 7000, Belgium
Dauby, Patrick ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Systématique et diversité animale
Boissery, P.; Agence de l'Eau Rhône-Méditerranée-Corse, Délégation de Marseille, Marseille, 13001, France
Richir, Jonathan ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (COU)
Title :
Zooplankton dynamics in a changing environment: A 13-year survey in the northwestern Mediterranean Sea
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