FN Archimer Export Format
PT J
TI Inter-specific and ontogenic differences in delta C-13 and delta N-15 values and Hg and Cd concentrations in cephalopods
BT 
AF CHOUVELON, Tiphaine
   SPITZ, Jerome
   CHEREL, Y.
   CAURANT, Florence
   SIRMEL, R.
   MENDEZ-FERNANDEZ, P.
   BUSTAMANTE, Paco
AS 1:1;2:1;3:2;4:1;5:1;6:1;7:1;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Univ La Rochelle, UMR CNRS 6250, F-17042 La Rochelle 01, France.
   CNRS, Ctr Etudes Biol Chize, UPR 1934, F-79360 Villiers En Bois, France.
C2 UNIV LA ROCHELLE, FRANCE
   CNRS, FRANCE
IF 2.711
TC 56
TU Centre national de la recherche scientifique
   Université de La Rochelle
UR https://archimer.ifremer.fr/doc/00166/27761/25938.pdf
LA English
DT Article
CR EVHOE 2000
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BO Thalassa
DE ;Stable isotopes;Metals;Trace elements;Ontogenesis;Prey;Ecological tracer;Northeastern Atlantic
AB Chemical tracers (e. g. stable isotopes or trace metals) are increasingly used to study trophic ecology and feeding habits of marine organisms and various factors can affect their values. The aim of the present study was to provide information on ontogenic effects on stable carbon and nitrogen values (delta C-13 and delta N-15) and on cadmium (Cd) and mercury (Hg) concentrations in 5 cephalopod species from the Bay of Biscay (North-East Atlantic Ocean). To this end, individuals belonging to 3 species showing the widest range of sizes were analysed for muscle delta C-13 and delta N-15 values and muscle Hg, and digestive gland Cd concentrations. Results showed that stable isotope ratios allowed discrimination of specific feeding strategies during ontogenesis. Segregation between 5 cephalopod species in terms of trophic ecology was also evidenced (different isotopic niches). In contrast, Hg concentrations varied over the same order of magnitude in these 5 cephalopod species, despite higher levels in the benthic octopus Eledone cirrhosa. Consistently, Hg concentrations followed the same ontogenic pattern and increased with increasing body size/age of cephalopods. Finally, Cd concentrations varied over 3 orders of magnitude among the 5 species. Despite possible effects of physiology in terms of metal bioaccumulation, Cd concentrations were likely to reflect specific feeding preferences or feeding zones and ontogenic variability within a single species. Thus, ontogenic effects have to be taken into account when stable isotope ratios of carbon and nitrogen or trace metals are used as ecological tracers; the best recommendation being to focus on a given class age.
PY 2011
SO Marine Ecology Progress Series
SN 0171-8630
PU Inter-research
VL 433
UT 000292890400009
BP 107
EP 120
DI 10.3354/meps09159
ID 27761
ER

EF