Effect of local hydroclimate on phytoplankton groups in the Charente estuary

Type Article
Date 2016-11
Language English
Author(s) Guesdon Stephane1, Stachowski-Haberkorn SabineORCID2, Lambert Christophe3, Beker Beatriz3, Brach-Papa Christophe4, Auger Dominique4, Bechemin Christian5
Affiliation(s) 1 : IFREMER, Lab Environm Ressource Pertuis Charentais, Ave Mus de Loup, F-17390 La Remblade, France.
2 : IFREMER, Lab Ecotoxicol, Rue Ile Yeu,BP 21105, F-44311 Nantes 03, France.
3 : UBO, Lab Sci Environm Marin LEMAR, IUEM UMR6539, Pl Nicolas Copernic, F-29280 Plouzane, France.
4 : IFREMER, Lab Biogeochim Contaminants Metall, Rue Ile Yeu,BP 21105, F-44311 Nantes 03, France.
5 : IFREMER, Lab Environm Ressource Pertuis Charentais, BP7, F-17137 Lhoumeau, France.
Source Estuarine Coastal And Shelf Science (0272-7714) (Academic Press Ltd- Elsevier Science Ltd), 2016-11 , Vol. 181 , P. 325-337
DOI 10.1016/j.ecss.2016.08.035
WOS© Times Cited 1
Keyword(s) Hydroclimate, Estuary, Phytoplankton, Size composition, Nutrients, Trace metals
Abstract This study aimed to describe seasonal variations of phytoplankton abundances in relation to the physical and chemical (nutrients and metals) environment under the influence of freshwater input in the Charente river estuary (Marennes-Oléron bay, France) over three years, from 2011 to 2014. Phytoplankton abundances were determined using microscopy and flow cytometry. Considering high frequency temperature and salinity data, breakpoints in each series led to the identification of two local hydroclimatic periods: the first (2011 and early 2012) being warmer and higher in salinity than the second (from spring 2012 to the beginning of 2014). A multiblock PLS analysis highlighted the significant contribution of the physical environment (temperature, salinity and Photosynthetically Active Radiation (PAR)) on phytoplankton abundances. Two partial triadic analyses (PTA) were run in order to visualize seasonal variations of i) phytoplankton groups and ii) nutrients and trace elements, irrespective of spatial gradient: picoeukaryote occurrence showed a difference between year 2011 and the years 2012 and 2013 (as did cadmium, nickel and silica levels). However, both PTA revealed greater differences between year 2013 and the years 2011 and 2012, as shown by occurrences of cryptophytes, dinoflagellates and nanoeukaryotes, as well as copper and phosphate levels. These results showed a shift between the hydroclimate breakpoint and some phytoplankton responses, suggesting that their development and succession might depend on conditions early in the year. Finally, a STATICO analysis was performed on the paired PTA in order to examine the relations of phytoplankton with nutrients and metals more closely. Most phytoplankton groups were represented on the first axis, together with cadmium on the one hand, and nitrates, silica and nickel on the other. This analysis revealed the separation of phytoplankton groups on the second axis that represented phosphates and copper. Hydroclimatic conditions and the nature of freshwater inputs, especially phosphates and copper content, might be key factors driving phytoplankton structure in the Charente estuary.
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Guesdon Stephane, Stachowski-Haberkorn Sabine, Lambert Christophe, Beker Beatriz, Brach-Papa Christophe, Auger Dominique, Bechemin Christian (2016). Effect of local hydroclimate on phytoplankton groups in the Charente estuary. Estuarine Coastal And Shelf Science, 181, 325-337. Publisher's official version : https://doi.org/10.1016/j.ecss.2016.08.035 , Open Access version : https://archimer.ifremer.fr/doc/00349/46005/