Contrasting resource limitations of marine primary producers: implications for competitive interactions under enriched CO2 and nutrient regimes

Abstract

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Divergent responses in growth and nutritional quality of coastal macroalgae to the combination of increased pCO2 and nutrients

“…both Ulva and Fucus were tested in a biculture experiment to inform community response, where we expect opportunistic Ulva to outgrow Fucus resulting in lower growth rates and tissue quality of Fucus (Connell and Russell, 2010;Falkenberg et al, 2013;Worm and Lotze, 2006). We interpret our results in the context of macroalgal response to climate change and future ecosystem structure.…”

“…High nutrient treatments resulted in decreased C:N ratios, which increases tissue quality. Falkenberg et al (2013) found that increasing each factor resulted in decreased C:N ratios for turf algae, but only nutrients effectively lowered the C:N in the kelp, Ecklonia radiata. We did not find a significant interaction between acidification and nutrients loading on tissue C:N, similar to Falkenberg et al (2013).…”

“…Campbell and Fourquean (2014) and Falkenberg et al (2013) found that at least one of the factors increased growth rates, but with no significant interaction. Fernández et al (2017) found that growth and photosynthetic rates of Macrocystis pyrifera were unaffected by pCO 2 and despite increased uptake of nitrogen, nutrient conditions were similarly in affective.…”

“…Of several studies on the combined impacts of ocean acidification and nutrients (Campbell and Fourqurean, 2014;Falkenberg et al, 2013;Russell et al, 2009), only Russell et al (2009) found a synergism between these two factors, with turf algal percent cover multiplied when both of these factors are increased. Campbell and Fourquean (2014) and Falkenberg et al (2013) found that at least one of the factors increased growth rates, but with no significant interaction.…”

“…While acidification studies are beginning to incorporate additional environmental stressors such as light intensity and warming Rautenberger et al, 2015;Roleda et al, 2012;Sarker et al, 2013), the combined effects of acidification and nutrients on primary producers are less understood (but see Campbell and Fourqurean, 2014;Falkenberg et al, 2013;Russell et al, 2009). …”