Effect of In Situ short–term temperature increase on carbon metabolism and dissolved organic carbon (DOC) fluxes in a community dominated by the seagrass Cymodocea nodosa

Egea, L.; Jiménez–Ramos, Rocío; Hernández, Ignacio; Brun, Fernando G.

doi:10.1371/journal.pone.0210386

Cited by 23 publications

(19 citation statements)

References 87 publications

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“…Additionally, its large shoot size and the density of the meadow make it more prone to self-shading, which may play a protective role against warm temperatures by reducing exposure to saturating light levels at which photosynthesis is particularly impacted by high temperature (Pedersen et al 2013). While we saw mixed responses, Egea et al (2019) reported a positive effect of increased seawater temperature on a C. no dosa meadow in southern Spain, indicating that this community was still well below its thermal optimum. They reported the meadow to be more autotrophic when exposed to short-term heatwaves, highlighting a potential positive effect of elevated temperatures on healthy seagrass meadows below their thermal limit (Egea et al 2019).…”

Section: Discussionmentioning

confidence: 64%

“…While we saw mixed responses, Egea et al (2019) reported a positive effect of increased seawater temperature on a C. no dosa meadow in southern Spain, indicating that this community was still well below its thermal optimum. They reported the meadow to be more autotrophic when exposed to short-term heatwaves, highlighting a potential positive effect of elevated temperatures on healthy seagrass meadows below their thermal limit (Egea et al 2019).…”

Section: Discussionmentioning

confidence: 64%

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Thermal dependence of seagrass ecosystem metabolism in the Red Sea

Burkholz¹,

Duarte²,

Garcías-Bonet³

2019

Mar. Ecol. Prog. Ser.

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The Red Sea is one of the warmest seas with shallow seagrass ecosystems exposed to extreme temperatures, in excess of 35°C, during the summer months. Seagrass meadows are net autotrophic ecosystems, but respiration increases faster than primary production with temperature. This may lead to a shift from an autotrophic to a heterotrophic system at the highest temperatures. Although tropical seagrasses are adapted to high temperatures, the metabolic rates of Red Sea seagrasses have not yet been reported. Here we assessed the community metabolism of 2 seagrass ecosystems, an Enhalus acoroides monospecific meadow and a Cymodocea serrulata and Halodule uninervis mixed meadow, located in the central Red Sea. We measured in situ net community production (NCP), community respiration (R), gross primary production (GPP), activation energy and community production−irradiance curves along their natural temperature gradient over 1 yr by measuring diel fluctuations in dissolved oxygen. The results were species-specific; while the monospecific meadow was autotrophic throughout the year (annual weighted average NCP: 64.63 ± 11.89 mmol O 2 m −2 d −1 , GPP:R ratio: 1.42 ± 0.06), the mixed meadow was heterotrophic during the summer months (annual weighted average NCP: −4.15 ± 9.39 mmol O 2 m −2 d −1 , GPP:R: 1.04 ± 0.05). In both seagrass meadows, R and GPP increased with increasing temperature, but differences in activation energies indicated that the mixed meadow is more sensitive to increasing seawater temperatures. These findings suggest contrasting responses in tropical seagrass species to rising temperature, pointing out the potential vulnerability of seagrasses to ocean warming in the Red Sea.

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 64%

Thermal dependence of seagrass ecosystem metabolism in the Red Sea

Burkholz¹,

Duarte²,

Garcías-Bonet³

2019

Mar. Ecol. Prog. Ser.

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“…Global seagrass are a from [194], macroalgae area from [195] and are a of othe r e cosystems from [188], e xcept the global coastal ocean [193] which e ncompasses estuarie s, we tlands, e stuaries, and contine ntal shelves. Seagrass data [188] update d from [196][197][198][199][200][201][202][203][204][205][206][207][208][209] and macroalgae data from . Plankton GPP and R in salt marshes from [236] and in mangroves from [52].…”

Section: Discussionmentioning

confidence: 99%

Carbon Balance in Salt Marsh and Mangrove Ecosystems: A Global Synthesis

Alongi¹

2020

Preprint

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Mangroves and salt marshes are among the most productive ecosystems in the global coastal ocean. Mangroves store more carbon (739 Mg CORG ha-1) than salt marshes (334 Mg CORG ha-1), but the latter sequester proportionally more (24%) net primary production (NPP) than mangroves (12%). Mangroves exhibit greater rates of gross primary production (GPP), above-ground net primary production (NPP) and plant respiration (RC) with higher PGPP/RC ratios, but salt marshes exhibit greater rates of below-ground NPP. Mangroves have greater rates of subsurface DIC production and, unlike salt marshes, exhibit significant microbial decomposition to a soil depth of 1 m. Salt marshes release more soil CH4 and export more dissolved CH4 , but mangroves release more CO2 from tidal waters and export greater amounts of POC, DOC and DIC to adjacent waters. Both ecosystems contribute only a small proportion of GPP, RE (ecosystem respiration) and NEP (net ecosystem production) to the global coastal ocean due to their small global area, but contribute 72% of air-sea CO2 exchange from the world’s wetlands and estuaries and contribute 34% of DIC export and 17% of DOC + POC export to the world’s coastal ocean. Thus, both wetland ecosystems contribute disproportionately to carbon flow of the global coastal ocean.

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“…Global seagrass area from [195], macroalgae area from [196] and area of other ecosystems from [188], except the global coastal ocean [194], which encompasses estuaries, other wetlands, and continental shelves. Seagrass data [188] updated from [197][198][199][200][201][202][203][204][205][206][207][208][209][210] and macroalgae data from . Plankton GPP and R in salt marshes from [237] and in mangroves from [52].…”

Section: Whole-ecosystem Carbon Mass Balancementioning

confidence: 99%

Carbon Balance in Salt Marsh and Mangrove Ecosystems: A Global Synthesis

Alongi

2020

JMSE

125

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Mangroves and salt marshes are among the most productive ecosystems in the global coastal ocean. Mangroves store more carbon (739 Mg CORG ha−1) than salt marshes (334 Mg CORG ha−1), but the latter sequester proportionally more (24%) net primary production (NPP) than mangroves (12%). Mangroves exhibit greater rates of gross primary production (GPP), aboveground net primary production (AGNPP) and plant respiration (RC), with higher PGPP/RC ratios, but salt marshes exhibit greater rates of below-ground NPP (BGNPP). Mangroves have greater rates of subsurface DIC production and, unlike salt marshes, exhibit active microbial decomposition to a soil depth of 1 m. Salt marshes release more CH4 from soil and creek waters and export more dissolved CH4, but mangroves release more CO2 from tidal waters and export greater amounts of particulate organic carbon (POC), dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC), to adjacent waters. Both ecosystems contribute only a small proportion of GPP, RE (ecosystem respiration) and NEP (net ecosystem production) to the global coastal ocean due to their small global area, but contribute 72% of air–sea CO2 exchange of the world’s wetlands and estuaries and contribute 34% of DIC export and 17% of DOC + POC export to the world’s coastal ocean. Thus, both wetland ecosystems contribute disproportionately to carbon flow of the global coastal ocean.

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Effect of In Situ short–term temperature increase on carbon metabolism and dissolved organic carbon (DOC) fluxes in a community dominated by the seagrass Cymodocea nodosa

Cited by 23 publications

References 87 publications

Thermal dependence of seagrass ecosystem metabolism in the Red Sea

Thermal dependence of seagrass ecosystem metabolism in the Red Sea

Carbon Balance in Salt Marsh and Mangrove Ecosystems: A Global Synthesis

Carbon Balance in Salt Marsh and Mangrove Ecosystems: A Global Synthesis

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