{"refrec":{"BRefID":362792,"RR":"<b>Guerrero-Meseguer, L.; Cox, T.E.; Sanz-Lazaro, C.; Schmid, S.; Enzor, L.A.; Major, K.; Gazeau, F.; Cebrian, J.</b> (2020). Does ocean acidification benefit seagrasses in a mesohaline environment? A mesocosm experiment in the northern Gulf of Mexico. <i>Est. Coast. 43(6)</i>: 1377-1393. <a href=\"https://dx.doi.org/10.1007/s12237-020-00720-5\" target=\"_blank\">https://dx.doi.org/10.1007/s12237-020-00720-5</a>","BEntID":360510,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Est. Coast. 43(6)</i>: 1377-1393. <a href=\"https://dx.doi.org/10.1007/s12237-020-00720-5\" target=\"_blank\">https://dx.doi.org/10.1007/s12237-020-00720-5</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Guerrero-Meseguer, L.; Cox, T.E.; Sanz-Lazaro, C.; Schmid, S.; Enzor, L.A.; Major, K.; Gazeau, F.; Cebrian, J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Guerrero-Meseguer, L. <i>et al.</i>","Englishabstract":"Ocean acidification is thought to benefit seagrasses because of increased carbon dioxide (CO<sub>2</sub>) availability for photosynthesis. However, in order to truly assess ecological responses, effects of ocean acidification need to be investigated in a variety of coastal environments. We tested the hypothesis that ocean acidification would benefit seagrasses in the northern Gulf of Mexico, where the seagrasses <i>Halodule wrightii</i> and <i>Ruppia maritima</i> coexist in a fluctuating environment. To evaluate if benefits of ocean acidification could alter seagrass bed composition, cores of <i>H. wrightii</i> and <i>R. maritima</i> were placed alone or in combination into aquaria and maintained in an outdoor mesocosm. Half of the aquaria were exposed to either ambient (mean pH of 8.1 ± 0.04 SD on total scale) or high CO<sub>2</sub> (mean pH&nbsp;7.7 ± 0.05 SD on total scale) conditions. After 54&nbsp;days of experimental exposure, the δ<sup>13</sup>C values were significantly lower in seagrass tissue in the high CO<sub>2</sub> condition. This integration of a different carbon source (either: preferential use of CO<sub>2</sub>, gas from cylinder, or both) indicates that plants were not solely relying on stored energy reserves for growth. Yet, after 41 to 54&nbsp;days, seagrass morphology, biomass, photo-physiology, metabolism, and carbon and nitrogen content in the high CO<sub>2</sub> condition did not differ from those at ambient. There was also no indication of differences in traits between the homospecific or heterospecific beds. Findings support two plausible conclusions: (1) these seagrasses rely heavily on bicarbonate use and growth will not be stimulated by near future acidification conditions or (2) the mesohaline environment limited the beneficial impacts of increased CO<sub>2</sub> availability.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Does ocean acidification benefit seagrasses in a mesohaline environment? 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