@article{fdi:010090336,
  title = {{T}racing groundwater sources in coastal food webs : nitrogen and carbon isotope values in mussels in a {M}editerranean lagoon},
  author = {{A}ndrisoa, {A}. and {S}tieglitz, {T}homas and {R}aimbault, {P}. and {R}odellas, {V}. and {L}artaud, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}hile the role that groundwater discharge plays in supporting primary production in coastal ecosystems is well recognized, there is still limited evidence on its impacts higher up the food chain. {I}n this study, we investigate the role of groundwater discharge in supplying nitrogen and carbon to the {M}editerranean mussels ({M}ytilus galloprovincialis) in the {S}alses-{L}eucate lagoon ({F}rance). {N}itrogen (delta {N}-15) and carbon (delta {C}-13) isotope values in the mantle and gill tissues of {M}editerranean mussels are used to trace nitrogen and carbon sources at groundwater-exposed sites and a control site. {O}ur results show similar isotope values for mantle and gill tissues, likely due to relatively stable environmental conditions in the study sites and to the biochemical composition of tissues. {D}iet shift, fractionation, and the physiological function of tissues could also explain this observation. delta {N}-15 values in mussel tissues increase overall in winter at both the groundwater-influenced sites (4.9 to 7.8 parts per thousand) and the control site (3.4 to 8.5 parts per thousand) in comparison with those in autumn (3.5 to 7.4 parts per thousand at the groundwater-influenced sites and 4.5 to 6.9 parts per thousand at the control site), likely due to reduced food supply and slower metabolism in winter, resulting in {N}-15 enrichment. {I}n contrast, mussel delta {C}-13 values decrease in winter at the groundwater-influenced sites (- 23.4 to - 21.6 parts per thousand) and the control site (- 22.0 to - 19.0 parts per thousand), suggesting input from {C}-13-depleted sources originating from groundwater input. {T}he comparison of the isotopic values of mussel tissues and potential food sources indicates that the main diet of {M}. galloprovincialis in the {S}alses-{L}eucate lagoon is a mixture of groundwater particulate organic matter ({POM}), lagoon {POM}, and marine {POM} ({POM} as a proxy of phytoplankton). {D}epleted delta {C}-13 values in mussel tissues, particularly at groundwater-exposed sites, provide evidence of uptake of groundwater-derived nutrients. {T}he ecological benefit of groundwater input on filter feeders results from local increases in food availability (mainly phytoplankton), supported by groundwater-derived nitrogen and carbon. {I}n summary, this study shows the combined (a) indirect effect of groundwater discharge on mussel growth via uptake of their food, phytoplankton, and (b) the likely direct feeding of groundwater {POM} by {M}. galloprovincialis. {I}t thus shows the important ecological implication of groundwater inputs in coastal lagoon food webs.},
  keywords = {{S}ubmarine groundwater discharge ; {N}itrogen- and carbon-stable isotopes ; {P}hytoplankton ; {M}ytilus galloprovincialis ; {C}oastal lagoon ; {FRANCE} ; {MEDITERRANEE}},
  booktitle = {},
  journal = {{E}stuaries and {C}oasts},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[14 ]},
  ISSN = {1559-2723},
  year = {2023},
  DOI = {10.1007/s12237-023-01285-9},
  URL = {https://www.documentation.ird.fr/hor/fdi:010090336},
}