Impact of the Phaeocystis globosa spring bloom on the intertidal benthic compartment in the eastern English Channel: A synthesis
|Author(s)||Spilmont Nicolas1, Denis Lucie1, Artigas Luis Felipe2, Caloin Frederic3, Courcot Lucie2, Creach Anne4, Desroy Nicolas5, Gevaert Francois1, Hacquebart Pascal1, Hubas Cedric2, 7, Janquin Marie-Andree1, Lemoine Yves4, Luczak Christophe1, 3, 8, Migne Aline6, 7, Rauch Mathieu1, Davoult Dominique6, 7|
|Affiliation(s)||1 : Univ Sci & Technol Lille, Lab Oceanol & Geosci, CNRS, Stn Marine Wimereux,UMR 8187 LOG, F-62930 Wimereux, France.
2 : Univ Littoral Cote dOpale, Lab Oceanol & Geosci, CNRS, LOG,UMR Maison Rche Environm Nat 8187, F-62930 Wimereux, France.
3 : Grp Ornithol & Naturliste Nord Pas de Calais GON, F-59000 Lille, France.
4 : Univ Sci & Technol Lille, CNRS, UMR 8016, F-59655 Villeneuve Dascq, France.
5 : IFREMER, LER FBN, Stn St Malo, F-35800 Dinard, France.
6 : Univ Paris 06, UPMC, UMR 7144, Stn Biol Roscoff,AD2M, Roscoff, France.
7 : CNRS, UMR 7144, Stn Biol Roscoff,AD2M, Roscoff, France.
8 : Univ Artois, IUFM, Ctr Gravelines, F-59820 Gravelines, France.
|Source||Marine Pollution Bulletin (0025-326X) (Elsevier), 2009 , Vol. 58 , N. 1 , P. 55-63|
|WOS© Times Cited||25|
|Keyword(s)||Macrozoobenthos, Bacteria, Saccharina latissima, Benthic fluxes, Phaeocystis globosa, Intertidal|
|Abstract||From 1999 to 2005, studies carried out in the frame of regional and national French programs aimed to determine whether the Phaeocystis globosa bloom affected the intertidal benthic communities of the French coast of the eastern English Channel in terms of composition and/or functioning. Study sites were chosen to cover most of the typical shore types encountered on this coast (a rocky shore, an exposed sandy beach and a small estuary). Both the presence of active Phaeocystis cells and their degradation product (foam) did have a significant impact on the studied shores. The primary production and growth rates of the kelp Saccharina latissima decreased during the bloom because of a shortage of fight and nutrient for the macroalgae. On sandy sediments, the benthic metabolism (community respiration and community primary production), as well as the nitrification rate, were enhanced during foam deposits, in relation with the presence of bacteria and active pelagic cells within the decaying colonies. In estuarine sediments, the most impressive impact was the formation of a crust at the sediment surface due to drying foam. This led to anoxic conditions in the surface sediment and resulted in a high mortality among the benthic community. Some organisms also tended to migrate upward and were then directly accessible to the higher trophic level represented by birds. Phaeocystis then created a shortcut in the estuarine trophic network. Most of these modifications lasted shortly and all the systems considered came back to their regular properties and activities a few weeks after the end of the bloom, except for the most impacted estuarine area. (C) 2008 Elsevier Ltd. All rights reserved.|