CESIMAR - CENPAT   25625
CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Intra-skeletal variability of stable isotope ratios of C and N in pinnipeds and cetaceans.
Autor/es:
CRESPO ENRIQUE ALBERTO; BASS LOPEZ, MARIA; CARDONA, LUIS; GARCÍA NÉSTOR ANÍBAL
Lugar:
Barcelona
Reunión:
Congreso; World Marine Mammal Conference; 2019
Institución organizadora:
Society for Marine Mammalogy
Resumen:
Intra-skeletal variability of stable isotope ratios of C and N in pinnipeds and cetaceansMaria Bas1,2, Néstor A. García3, Enrique A. Crespo3and Luis Cardona2,41.Centro Austral de Investigaciones Científicas (CADIC-CONICET), Bernardo Houssay 200, 9410, Ushuaia, Argentina.2.Biodiversity Research Institute (IRBio), University of Barcelona, Av. Diagonal 643, 08028, Barcelona, Spain.3.Centro para el Estudio de Sistemas Marinos (CESIMAR - CCT CONICET - CENPAT), Boulevard Brown 2915, 9120, Puerto Madryn, Argentina.4.Department of Evolutionary Biology, Ecology and Environmental Science, University of Barcelona, Av. Diagonal 643, 08028, Barcelona, Spain.ABSTRACTStable isotope ratios of C and N in three different bones (atlas vertebra, humerus and basioccipital) from different skeleton regions of two phylogenetically unrelated groups of marine mammals,Otariidae and Delphinidae, were analysed before (bulk) and after delipidation and demineralization (dml). Results revealed that combined delipidation and demineralization resulted in a significant increase in the δ13C and δ15N mean values of the basioccipital in both species, no effect on the δ13C and δ15N mean values of the atlas of any species and species dependent effects on the δ13C and δ15N mean values of the humerus. Furthermore, results confirm that the δ15Nbulk values of different skeletal elements from the skull, the axial skeleton and the proximal part of the appendicular skeleton of cetaceans and pinnipeds are interchangeable. However, caution is needed when dealing with bones made up only by cortical bone, such as basioccipital, because the δ13Cdml value and the collagen contents could differ significantly from those of other bones.Bones from the distal part of the appendicular skeleton may also differ in stable isotope ratios, as suggested by previous research. Finally, combined delipidation and demineralization have a strong influence in both δ13C and δ15N and hence values from bulk and pretreated samples should not be combined or compared directly.Keywords: Otariaflavescens, Lagenorhynchusobscurus, cortical bone, trabecular bone, otariidae