The effect of environmental change in structuring the phytoplankton communities of the coastal waters of the Eastern English Channel was investigated by appl...

Abstract. Decadal time series of chlorophyll a concentrations sampled at high and low frequencies are explored to study climate-induced impacts on the processes inducing interannual variations in the initiation of the phytoplankton growing period (IPGP) in early spring. We specifically detail the IPGP in two contrasting coastal temperate ecosystems under the influence of rivers highly rich in nutrients: the Bay of Brest and the Bay of Vilaine. In both coastal ecosystems, we observed a large interannual variation in the IPGP influenced by sea temperature, river inputs, light availability (modulated by solar radiation and water turbidity), and turbulent mixing generated by tidal currents, wind stress, and river runoff. We show that the IPGP is delayed by around 30 d in 2019 in comparison with 2010. In situ observations and a one-dimensional vertical model coupling hydrodynamics, biogeochemistry, and sediment dynamics show that the IPGP generally does not depend on one specific environmental factor but on the interaction between several environmental factors. In these two bays, we demonstrate that the IPGP is mainly caused by sea surface temperature and available light conditions, mostly controlled by the turbidity of the system before first blooms. While both bays are hydrodynamically contrasted, the processes that modulate the IPGP are similar. In both bays, the IPGP can be delayed by cold spells and flood events at the end of winter, provided that these extreme events last several days.

Découvrez, chaque jour, une analyse de notre partenaire The Conversation. Aujourd’hui, des écologues nous expliquent comment prévenir l’impact environnemental sur une espèce

Labellisée Grand site de France, la baie de Somme, dans les Hauts-de-France, offre le cadre idéal pour un week-end au grand air. De la pointe du Hourdel au parc du Marquenterre, nos conseils et bonnes adresses.

Although eutrophication induced by anthropogenic nutrient enrichment is a driver of shifts in community composition and eventually a threat to marine biodive...

Extreme weather events affect coastal marine ecosystems. The increase in intensity and occurrence of such events drive modifications in coastal hydrology and...

Communications Biology - Martin Edwards et al. use data spanning from 1958–2017 from the Continuous Plankton Recorder Survey of the North Atlantic Ocean to examine krill distribution and...

Abstract. Annual plankton succession has been investigated for many decades with hypotheses ranging from abiotic to biotic mechanisms being proposed to exp

Après plusieurs mois de montage, les premiers prélèvements biosédimentaires du projet sur les habitats benthiques intertidaux sensibles, HABISSE, du Parc naturel marin des estuaires picards et de la mer d’Opale ont eu lieu en septembre-octobre. HABISSE doit permettre d’améliorer les connaissances sur les habitats sédimentaires intertidaux, sableux et vaseux (1130-1, 1140 et 1110-1 dans les chenaux) et de favoriser une gestion durable des espaces intertidaux.

The spectre of increasing impacts on exploited fish stocks in consequence of warmer climate conditions has become a major concern over the last decades. It is now imperative to improve the way we pro...