Publications des scientifiques de l'IRD

Sirot C., Gronkjaer P., Pedersen J. B., Panfili Jacques, Zetina-Rejon M., Tripp-Valdez A., Ramos-Miranda J., Flores-Hernandez D., Sosa-Lopez A., Darnaude A. M. (2017). Using otolith organic matter to detect diet shifts in Bardiella chrysoura, during a period of environmental changes. Marine Ecology Progress Series, 575, p. 137-152. ISSN 0171-8630.

Titre du document
Using otolith organic matter to detect diet shifts in Bardiella chrysoura, during a period of environmental changes
Année de publication
2017
Type de document
Article référencé dans le Web of Science WOS:000406135500011
Auteurs
Sirot C., Gronkjaer P., Pedersen J. B., Panfili Jacques, Zetina-Rejon M., Tripp-Valdez A., Ramos-Miranda J., Flores-Hernandez D., Sosa-Lopez A., Darnaude A. M.
Source
Marine Ecology Progress Series, 2017, 575, p. 137-152 ISSN 0171-8630
Accurate knowledge on fish trophic ecology and its modifications is crucial for understanding the impact of global change on ecosystems. In this context, we investigated the value of the delta C-13 and delta N-15 of otolith soluble organic matter (SOM) for identifying temporal diet shifts in American silver perch Bairdiella chrysoura over a 30-yr period characterized by strong changes in its population size and habitats within the Terminos Lagoon (Mexico). We first compared the otolith SOM isotopic signatures from present-clay adults to those of muscle and the main local prey. Our results suggest that otolith SOM can be confidently extracted and analyzed for both present and past otoliths of this species. The mean otolith SOM signatures obtained (-15.92 +/- 1.35%, for delta C-13 and 9.38 +/- 0.93%, for delta N-15) were consistent with those of the diet as 85% of the individual signatures were included within the prey isotopic niche area. Moreover, this study supports a trophic enrichment factor between diet and otolith (TEFdiet-otolith) close to 0 for delta N-15, while for delta C-13, the TEFololith-muscle of +0.02% warrants further investigation. Then, we compared past and contemporary otolith SOM signatures to investigate temporal diet shifts in B. chrysoura. This showed that 613C and delta N-15 differed significantly between the past and present period even if the temporal shift remained relatively small (respectively +1.17%, and 0.55%). The present study substantiates the use of otolith SOM delta C-13 and delta N-15 as a proxy of fish present and past trophic position, opening the possibility for major progress in studies of temporal changes in food web ecology.
Plan de classement
Limnologie biologique / Océanographie biologique [034] ; Ecologie, systèmes aquatiques [036]
Description Géographique
MEXIQUE
Localisation
Fonds IRD [F B010070367]
Identifiant IRD
fdi:010070367
Contact