Year of Publication
2021

Journal

Estuarine, Coastal and Shelf Science
Volume
258
Date Published
Jan-09-2021
Number of Pages
107409
DOI
10.1016/j.ecss.2021.107409
URL
https://linkinghub.elsevier.com/retrieve/pii/S0272771421002626
ISSN Number
02727714
HCERES category
ACL - Articles in international or national peer-reviewed journals indexed by HCERES or in international databases
Abstract

In coastal areas, global changes are known to affect estuaries and their plume leading to water temperature increase and river discharge variations, which are two of the main drivers controlling phytoplankton dynamics. This paper aims at understanding the past 10 years’ variations in term of communities’ stability and trajectories along with their relationship with the environment. Considering the high environmental variability along coastal areas, we focused our study on six contrasted estuarine systems from the eastern English Channel. Using monthly monitoring from 2008 to 2019, the response of the micro-phytoplankton compartment was investigated through the abundances of a hundred taxa and several abiotic parameters’ records. The results indicate an overall stability in community composition with an average of 30–40% similarity between pairs of samples over the study period. The phytoplankton assemblages also display greater spatial heterogeneity during summer in comparison with other seasons. The co-inertia analysis highlighted four separate systems linked to major drivers; a system under strong river and nutrient flows influence, a well-mixed and oxygenized estuary, a system challenged by offshore marine waters, and finally a system under shellfish farms pressure. This structuration is built from the dominance of a handful of species that differs from one place to another, which explains why phytoplankton is mostly site specific. Additionally, the low variations led a by few species’ dominance also explains the interannual stability noticed during summer at each area, in spite of the high diversity observed.