@article{fdi:010077289, title = {{T}rends in tuna carbon isotopes suggest global changes in pelagic phytoplankton communities}, author = {{L}orrain, {A}nne and {P}ethybridge, {H}. and {C}assar, {N}. and {R}eceveur, {A}. and {A}llain, {V}. and {B}odin, {N}athalie and {B}opp, {L}. and {C}hoy, {C}. {A}. and {D}uffy, {L}. and {F}ry, {B}. and {G}oni, {N}. and {G}raham, {B}. {S}. and {H}obday, {A}. {J}. and {L}ogan, {J}. {M}. and {M}{\'e}nard, {F}r{\'e}d{\'e}ric and {M}enk{\`e}s, {C}hristophe and {O}lson, {R}. {J}. and {P}agendam, {D}. {E}. and {P}oint, {D}avid and {R}evill, {A}. {T}. and {S}omes, {C}. {J}. and {Y}oung, {J}. {W}.}, editor = {}, language = {{ENG}}, abstract = {{C}onsiderable uncertainty remains over how increasing atmospheric {CO}2 and anthropogenic climate changes are affecting open-ocean marine ecosystems from phytoplankton to top predators. {B}iological time series data are thus urgently needed for the world's oceans. {H}ere, we use the carbon stable isotope composition of tuna to provide a first insight into the existence of global trends in complex ecosystem dynamics and changes in the oceanic carbon cycle. {F}rom 2000 to 2015, considerable declines in delta {C}-13 values of 0.8 parts per thousand-2.5 parts per thousand were observed across three tuna species sampled globally, with more substantial changes in the {P}acific {O}cean compared to the {A}tlantic and {I}ndian {O}ceans. {T}una recorded not only the {S}uess effect, that is, fossil fuel-derived and isotopically light carbon being incorporated into marine ecosystems, but also recorded profound changes at the base of marine food webs. {W}e suggest a global shift in phytoplankton community structure, for example, a reduction in {C}-13-rich phytoplankton such as diatoms, and/or a change in phytoplankton physiology during this period, although this does not rule out other concomitant changes at higher levels in the food webs. {O}ur study establishes tuna delta {C}-13 values as a candidate essential ocean variable to assess complex ecosystem responses to climate change at regional to global scales and over decadal timescales. {F}inally, this time series will be invaluable in calibrating and validating global earth system models to project changes in marine biota.}, keywords = {albacore tuna ; {A}tlantic {O}cean ; bigeye tuna ; biogeochemical cycles ; carbon cycle ; {I}ndian {O}cean ; {P}acific {O}cean ; phytoplankton ; {S}uess effect ; yellowfin tuna ; {PACIFIQUE} ; {ATLANTIQUE} ; {OCEAN} {INDIEN}}, booktitle = {}, journal = {{G}lobal {C}hange {B}iology}, volume = {26}, numero = {2}, pages = {458--470}, ISSN = {1354-1013}, year = {2020}, DOI = {10.1111/gcb.14858}, URL = {https://www.documentation.ird.fr/hor/fdi:010077289}, }