@article{fdi:010078102,
  title = {{T}rophic resources and mercury exposure of two silvertip shark populations in the {N}ortheast {P}acific {O}cean},
  author = {{L}e {C}roizier, {G}a{\¨e}l and {L}orrain, {A}nne and {S}chaal, {G}. and {K}etchum, {J}. and {H}oyos-{P}adilla, {M}. and {B}esnard, {L}. and {M}unaron, {J}ean-{M}arie and {L}e {L}oc'h, {F}ran{\c{c}}ois and {P}oint, {D}avid},
  editor = {},
  language = {{ENG}},
  abstract = {{W}orldwide shark populations have experienced rapid declines over the last decades, mainly due to overfishing. {M}arine protected areas ({MPA}s) have thus become an indispensable tool for the protection of these marine predators. {T}wo recently-created {MPA}s in the {N}ortheast {P}acific {O}cean, the {R}evillagigedo {N}ational {P}ark and {C}lipperton {A}toll, are characterized by different trophic structures potentially influencing the trophic niche and contaminant exposure of resident sharks in these two sites. {I}n this context, we used carbon (delta {C}-13) and nitrogen (delta {N}-15) stable isotope analyzes as well as total mercury concentrations ([{TH}g]) to assess the effect of foraging site on the trophic niche and {H}g levels of juvenile silvertip ({ST}) sharks {C}archarhinus albimarginatus. {A}nalyzing fin clip samples from {R}evillagigedo and {C}lipperton, we found that shark delta {N}-15 varied spatially in relation to delta {N}-15 baselines, suggesting similar trophic position in both {MPA}s. {M}oreover, delta {C}-13 values indicated that {ST} sharks from {R}evillagigedo would feed on different food webs (i.e. both benthic and pelagic) while individuals from {C}lipperton would only rely on benthic food webs. {T}hese differences between {MPA}s led to a weak overlap of isotopic niches between the two populations, highlighting the site residency of juvenile {ST} sharks. {W}ithin each population, [{TH}g] was not correlated with trophic tracers (delta {N}-15 and delta {C}-13) and was also similar between populations. {T}his study revealed no influence of site or food web in [{TH}g] and raises the question of the origin of {H}g exposure for reef shark populations in the {N}ortheast {P}acific {O}cean.},
  keywords = {{T}op-predators ; {M}ercury transfer ; {F}ood webs ; {F}oraging habitat ; {S}table isotopes ; {MPA}s ; {PACIFIQUE} ; {CLIPPERTON} ; {EVILLAGIGEDO} {ARCHIPEL}},
  booktitle = {},
  journal = {{C}hemosphere},
  volume = {253},
  numero = {},
  pages = {126645 [10 ]},
  ISSN = {0045-6535},
  year = {2020},
  DOI = {10.1016/j.chemosphere.2020.126645},
  URL = {https://www.documentation.ird.fr/hor/fdi:010078102},
}