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2020-07-23 - Article/Dans un journal avec peer-review - Anglais - 15 page(s)

Fullgrabe Lovina, Grosjean Philippe , Gobert Sylvie, Lejeune Pierre, Leduc Michèle, Engels Guyliann , Dauby Patrick, Boissery Pierre, Richir Jonathan, "Zooplankton dynamics in a changing environment: A 13-year survey in the northwestern Mediterranean Sea" in Marine Environmental Research, 159, 104962

  • Edition : Elsevier (Netherlands)
  • Codes CREF : Biologie (DI3100)
  • Unités de recherche UMONS : Ecologie numérique des milieux aquatiques (S807)
  • Instituts UMONS : Institut de Recherche sur les Systèmes Complexes (Complexys)
Texte intégral :

Abstract(s) :

(Anglais) 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 sea- sonal 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 character- ized 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 nu- trients (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 ther- mal 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 re- gional zooplankton community.


Mots-clés :
  • (Anglais) Climate change
  • (Anglais) Typical year
  • (Anglais) Time series
  • (Anglais) Image analysis
  • (Anglais) North Atlantic Oscillation
  • (Anglais) Mediterranean Sea