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-(a) Isotopic composition of carbon and nitrogen (δ 13 C and δ 15 N) of P. oceanica leaves collected during May 2017 and September 2018 surveys. (b) Isotopic composition of carbon and sulphur (δ 13 C and δ 34 S) of P. oceanica leaves collected during September 2018 survey.
Source publication
The hydrothermal area of Panarea (Aeolian Islands) represents a valuable natural laboratory to study the effects of ocean acidification (OA) on Posidonia oceanica (L.) Delile, that populates these shallow vents expressing unique plant features. Stable isotopes of carbon, nitrogen and sulphur (δ 13 C, δ 15 N, δ 34 S), powerful indicators of the orig...
Contexts in source publication
Context 1
... -The carbon isotopic composition (δ 13 C) of P. oceanica leaves (Fig. 2a) was significantly lower (p ≤ 0.01) in September 2018 (−17.99 ± 1.67 ‰) than in May 2017 (−15.38 ± 1.53 ‰), even when excluding the extremely low values measured at Campo 21 station (−27.02 ± 2.20 ‰). This difference was particularly significant (p ≤ 0.01) when only Bottaro and Hot stations were considered (May 2017: −14.13 ± 0.80 ‰; ...
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... Campo 21 and more similar to the control station Raja (−16.04 ± 1.05 ‰), confirming that a state of equilibrium was reached after the gas outburst and crater formation (Noè et al., 2020). Except for the high values measured at Campo 21 station, no difference was observed in nitrogen isotopic composition (δ 15 N) between the two sampling campaigns (Fig. 2a). The high δ 15 N values at Campo 21 (2.69 ± 0.39 ‰) also indicate the strong hydrothermal activity at this site. As previously observed at other hydrothermal areas (Scartazza et al., 2017), δ 15 N values appear to increase at sites characterised by CO2 emissions, similar to Campo 21. The sulphur isotopic composition (δ 34 S; Fig. 2b) ...
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... campaigns (Fig. 2a). The high δ 15 N values at Campo 21 (2.69 ± 0.39 ‰) also indicate the strong hydrothermal activity at this site. As previously observed at other hydrothermal areas (Scartazza et al., 2017), δ 15 N values appear to increase at sites characterised by CO2 emissions, similar to Campo 21. The sulphur isotopic composition (δ 34 S; Fig. 2b) measured at control station Raja (21.00 ± 2.08 ‰) was comparable to the average δ 34 S of seawater sulphate (ranging between 18 and 22 ‰; Böttcher et al., 2007), while statistically significantly lower values (p ≤ 0.01) were found at Bottaro and Campo 21 (19.62 ± 1.49 ‰), suggesting the presence of different sulphur sources at vent ...
