@article{fdi:010094846,
  title = {{U}sing carbon, nitrogen, sulfur, and mercury isotopes to trace elasmobranch foraging habitats in contrasting biogeochemical environments},
  author = {{B}esnard, {L}ucien and {L}e {C}roizier, {G}ael and {S}onke, {J}. {E}. and {G}alván-{M}agaña, {F}. and {T}rueman, {C}. and {M}artínez-{R}incón, {R}. {O}. and {H}arrod, {C}. and {K}raffe, {E}. and {P}oint, {D}avid and {S}oto-{L}ópez, {K}. and {S}chaal, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}table isotopes are well established as routine and reliable tracers of nutrient flux and trophic structure. {H}owever, inferring trophic ecology from isotopic data is challenging due to variability at the food web base and systematic differences in biochemical fractionation during metabolism. {A}nalyses of isotope systems from multiple elements with contrasting fractionation drivers may resolve some sources of variance, strengthening connections between measured isotopic variations and inferred ecological processes. {T}his study combines carbon (delta 13{C}), nitrogen (delta 15{N}), sulfur (delta 34{S}), and mercury ({D}elta 199{H}g/delta 202{H}g) isotopes to investigate trophic niches of coastal and oceanic elasmobranchs across two ecosystems in northwestern {M}exico. {I}n the {P}acific {O}cean, similar delta 13{C}, delta 15{N}, {D}elta 199{H}g, and delta 202{H}g values suggest that elasmobranchs relied on common pelagic resources, likely from upwelling events. {I}n the {G}ulf of {C}alifornia, coastal species with higher delta 13{C} and delta 15{N} values and lower {D}elta 199{H}g and delta 202{H}g values fed on prey isotopically distinct from those offshore, allowing classification trees to identify foraging habitats more accurately than in the {P}acific. {M}eanwhile, delta 34{S} values systematically decreased from oceanic to coastal species at both sites and were highlighted as the most discriminative isotopic tracer by random forests. {T}his study advocates for integrating complementary isotopic analyses to better comprehend biogeochemical and ecological mechanisms.},
  keywords = {trophic ecology ; isotopic niche ; {G}ulf of {C}alifornia ; {P}acific {O}cean ; shark ; ray ; biogeochemical processes ; upwelling ; {PACIFIQUE} ; {CALIFORNIE} {GOLFE}},
  booktitle = {},
  journal = {{E}nvironmental {S}cience and {T}echnology},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[13 ]},
  ISSN = {0013-936{X}},
  year = {2025},
  DOI = {10.1021/acs.est.5c01680},
  URL = {https://www.documentation.ird.fr/hor/fdi:010094846},
}