FN Archimer Export Format
PT J
TI Long-term evolution (1988-2008) of Zostera spp. meadows in Arcachon Bay (Bay of Biscay)
BT 
AF PLUS, Martin
   DALLOYAU, Sebastien
   TRUT, Gilles
   AUBY, Isabelle
   DE MONTAUDOUIN, Xavier
   EMERY, Eric
   NOEL, Claire
   VIALA, Christophe
AS 1:1;2:1;3:1;4:1;5:2;6:3;7:4;8:4;
FF 1:PDG-DOP-LER-LERAR;2:PDG-DOP-LER-LERAR;3:PDG-DOP-LER-LERAR;4:PDG-DOP-LER-LERAR;5:;6:PDG-DOP-LER-LERPAC;7:;8:;
C1 IFREMER, LER AR, F-33120 Arcachon, France.
   Univ Bordeaux 1, CNRS, UMR EPOC 5805, Stn Marine Arcachon, F-33120 Arcachon, France.
   IFREMER, LER PAC, F-83507 La Seyne Sur Mer, France.
   SEMANTIC TS, F-83110 Sanary, France.
C2 IFREMER, FRANCE
   UNIV BORDEAUX, FRANCE
   IFREMER, FRANCE
   SEMANTIC TS, FRANCE
SI ARCACHON
   TOULON
SE PDG-DOP-LER-LERAR
   PDG-DOP-LER-LERPAC
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 1.887
TC 74
UR https://archimer.ifremer.fr/doc/00003/11376/7969.pdf
LA English
DT Article
DE ;seagrass;temporal evolution;aerial photography;acoustic sonar;Zostera noltii;Zostera marina;Arcachon Bay
AB The spatial variability of seagrass meadows in Arcachon Bay, was studied between 1988 and 2008 using a combination of mapping techniques based on aerial photographs for intertidal dwarf-grass (Zostera noltti) beds and acoustic sonar for permanently submerged eelgrass (Zostera marina) populations. The results show a severe decline over the period for both species, as well as an acceleration of the decline since 2005 for Z. noltii. The total surface regression over the studied period is estimated to be 22.8 km(2) for Z. noltii and 2.7 km(2) for Z. marina, which represent declines of 33 and 74% respectively. Environmental data time series spanning the same period were investigated in order to seek the causes for such a decline. The calculated inter-annual trends for temperature, salinity, nitrate plus nitrite, ammonia, suspended sediment and chlorophyll a did not identify any clear environmental change capable of explaining the observed seagrass regression. For instance, no evident sign of eutrophication was observed over the study period. On the other hand, we suggest that the observed variations of ammonia in the inner part of the lagoon are a symptom of the seagrasses' disappearance and thus, a first sign indicating a change of the Arcachon Bay ecosystem towards more instability and vulnerability. Several hypotheses to explain the observed seagrass decay are proposed. (C) 2010 Elsevier Ltd. All rights reserved.
PY 2010
PD APR
SO Estuarine Coastal And Shelf Science
SN 0272-7714
PU Academic Press Ltd- Elsevier Science Ltd
VL 87
IS 2
UT 000276622100020
BP 357
EP 366
DI 10.1016/j.ecss.2010.01.016
ID 11376
ER

EF