@article{fdi:010091438,
  title = {{R}esource partitioning in hammerhead shark species out-migrating from coastal ecosystems in the {G}ulf of {C}alifornia},
  author = {{B}esnard, {L}. and {L}e {C}roizier, {G}ael and {G}alván-{M}agaña, {F}. and {M}athieu-{R}esuge, {M}. and {K}raffe, {E}. and {M}artínez-{R}incón, {R}. {O}. and {L}e {G}rand, {F}. and {B}ideau, {A}. and {S}chaal, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{J}uveniles of large hammerhead shark species occupy coastal nurseries before migrating offshore to reproduce. {I}n the central {G}ulf of {C}alifornia, artisanal elasmobranch fisheries have reported catches of juvenile scalloped {S}phyrna lewini and smooth {S}. zygaena hammerhead sharks, but their local foraging habits are yet to be fully understood. {I}n this study, the trophic niches of both hammerhead species as well as of sympatric {P}acific sharpnose sharks {R}hizoprionodon longurio were investigated using stable isotope values (delta 13{C}, delta 34{S} and delta 15{N}) and fatty acid compositions in whole blood and muscle tissues. {D}espite interspecific similarities among trophic niches, smooth hammerheads were characterized by lower delta 13{C}, higher delta 34{S} and greater proportion of docosahexaenoic acid ({DHA}) in both tissues, suggesting they were already partly relying on offshore pelagic resources. {F}or scalloped hammerheads, muscle reflected coastal dietary resources, while offshore trophic markers were detected in blood integrating prey signal over shorter time periods, indicating their more recent initiation of ontogenetic migration. {M}ultidimensional niche calculation revealed low overlap between hammerhead shark trophic niches, implying that potential fine-scale differences in habitat use could reduce competition between these morphologically and ecologically similar species. {I}n the meantime, the isotopic niches of juvenile scalloped and smooth hammerheads were smaller than that of {P}acific sharpnose sharks, suggesting they could be more specialized consumers. {O}verall, the identification of foraging grounds for juvenile hammerhead sharks calls for a future characterization of their residency time in coastal ecosystems to further understand their interactions with fishing pressure in the {G}ulf of {C}alifornia.},
  keywords = {{S}phyrna spp. ; {T}rophic niche ; {C}arbon isotopes ; {N}itrogen isotopes ; {S}ulfur isotopes ; {F}atty acids ; {S}ympatric sharks ; {O}ntogenetic habitat shift ; {A}rtisanal fisheries ; {PACIFIQUE} ; {CALIFORNIA} ; {CALIFORNIE} {GOLFE}},
  booktitle = {},
  journal = {{M}arine {E}cology {P}rogress {S}eries},
  volume = {732},
  numero = {},
  pages = {101--117},
  ISSN = {0171-8630},
  year = {2024},
  DOI = {10.3354/meps14549},
  URL = {https://www.documentation.ird.fr/hor/fdi:010091438},
}