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Abstract. The isotopic composition of carbon in macroalgae (δ13C) ishighly variable, and its prediction is complex concerning terrestrialplants. The determinants of δ13C macroalgal variations wereanalyzed in a large stock of specimens that vary in taxa and morphology and werecollected in shallow marine habitats in the Gulf of California (GC) withdistinctive environmental conditions. A large δ13C variability(−34.6 ‰ to −2.2 ‰) was observed.Life-forms (taxonomy 57 %, morphology and structural organization 34 %)explain the variability related to carbon use physiology. Environmentalconditions influenced the δ13C macroalgal values but did notchange the physiology, which is most likely inherently species-specific.Values of δ13C were used as indicators of the presence orabsence of carbon concentrating mechanisms (CCMs) and as integrative valuesof the isotope discrimination during carbon assimilation in the life cyclemacroalgae. Based on δ13C signals, macroalgae were classifiedin three strategies relative to the capacity of CCM: (1) HCO3-uptake (δ13C &gt; −10 ‰), (2) using amix of CO2 and HCO3- uptake (-10  −30 ‰), and (3) CO2 diffusiveentry (δ13C &lt; −30 ‰). Most speciesshowed a δ13C that indicates a CCM using a mix of CO2 andHCO3- uptake. HCO3- uptake is also widespread among GCmacroalgae, with many Ochrophyta species. Few species belonging toRhodophyta relied on CO2 diffusive entry exclusively, while calcifyingmacroalgae species using HCO3- included only Amphiroa and Jania. The isotopicsignature evidenced the activity of CCM, but it was inconclusive about thepreferential uptake of HCO3- and CO2 in photosynthesis andthe CCM type expressed in macroalgae. In the study of carbon use strategies,diverse, species-specific, and complementary techniques to the isotopic toolsare required.

biogeosciences

An analysis of the variability in &amp;lt;i&amp;gt;δ&amp;lt;/i&amp;gt;&amp;lt;sup&amp;gt;13&amp;lt;/sup&amp;gt;C in macroalgae from the Gulf of California: indicative of carbon concentration mechanisms and isotope discrimination during carbon assimilation