Ecosystem metabolism and carbon fluxes of a tidally-dominated coastal lagoon

Santos, Rui; Silva, João; Alexandre, Ana; Navarro, Núria; Barrón, Cristina; Duarte, Carlos M.

doi:10.1007/bf02803424

Cited by 62 publications

(51 citation statements)

References 18 publications

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“…The higher areal R rates for shoalgrass patches when compared to bare sediment documented in this study most likely result from larger areal primary producer biomass (Murray & Wetzel 1987, Daehnick & Sullivan 1989, higher organism abundance utilizing the patches for shelter and food (Morgan & Kitting 1984, Heck et al 2003a), higher sedimentation of detritus and subsequent decomposition (Gacia et al 2003, Barron et al 2004, and the contribution by nonphotosynthetic shoalgrass belowground biomass (Pollard & Kogure 1993, Touchette & Burkholder 2000. Bare sediments can attain higher areal R rates than seagrass beds in eutrophic estuaries (D'Avanzo et al 1996) or when subject to intense sedimentation of organic matter (Livingston et al 1998), but this is not the case in our lagoons.…”

Section: Discussionmentioning

confidence: 66%

“…Due to their abundance and the myriad organisms associated with them, coastal seagrass meadows are significant drivers of oxygen and carbon dynamics (Dunton 1996, Barron et al 2004, Santos et al 2004, Clavier et al 2005. The study of system metabolism is important to ascertain whether a system is a source or sink of carbon and oxygen and to understand its role in ecosystem-scale budgets.…”

Section: Abstract: Seagrass · Halodule Wrightii · Benthic Microalgaementioning

confidence: 99%

“…It is generally accepted that seagrass meadows are normally net autotrophic (Dunton 1996, Hemminga & Duarte 2000, Barron et al 2004, Santos et al 2004). Thus, in benthic coastal systems that are seagrassdominated, one could argue that the degree of autotrophy decreases as seagrasses decline.…”

Section: Abstract: Seagrass · Halodule Wrightii · Benthic Microalgaementioning

confidence: 99%

See 2 more Smart Citations

Benthic metabolism across a gradient of anthropogenic impact in three shallow coastal lagoons in NW Florida

Stutes¹,

Cebrián²,

Stutes³

et al. 2007

Mar. Ecol. Prog. Ser.

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Section: Discussionmentioning

confidence: 66%

Section: Abstract: Seagrass · Halodule Wrightii · Benthic Microalgaementioning

confidence: 99%

See 1 more Smart Citation

Benthic metabolism across a gradient of anthropogenic impact in three shallow coastal lagoons in NW Florida

Stutes¹,

Cebrián²,

Stutes³

et al. 2007

Mar. Ecol. Prog. Ser.

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“…In the present study, the GCP rate was much higher at the end of immersion than during emersion for both communities, whereas light intensity was always lower during immersion. This certainly cannot be explained by the contribution of planktonic organisms, which can be assumed to be negligible (see for example Santos et al 2004, who measured a plankton contribution of approximately 0.01% to the metabolism of a Z. noltii community). Zostera spp.…”

Section: Discussionmentioning

confidence: 99%

Community-level carbon flux variability over a tidal cycle in Zostera marina and Z. noltii beds

Ouisse¹,

Migné²,

Davoult³

2011

Mar. Ecol. Prog. Ser.

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Abiotic parameters such as light, temperature, nutrient availability and inorganic carbon source are known to vary widely between immersion and emersion. We measured gross community productivity (GCP) and community respiration (CR) over spring tidal cycles in intertidal Zostera marina and Z. noltii communities. CO 2 fluxes during emersion and inorganic carbon fluxes during immersion were assessed using closed benthic chambers. GCP and CR rates were significantly higher during immersion than during emersion for both communities. In July, GCP rates were 3-and 5-fold higher and CR rates were 2.5-and 9-fold higher during immersion for the Z. marina and Z. noltii communities, respectively. This trend was confirmed in the Z. noltii community at different periods of the year (February, April and November). Neither photoinhibition nor desiccation was measured during emersion, but shading might have greatly limited the GCP rates. Higher CR during immersion could be explained by enhanced bacterial and infaunal activity.

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“…It is a mesotidal system characterized by large intertidal flats (Andrade, 1990). The seagrass Zostera noltei dominates the intertidal flats of Ria Formosa lagoon, it's distribution ranges up to 2 m from the mean tide level and plays a significant role in the carbon metabolism of the lagoon (Santos et al, 2004). The Z. noltei meadows regularly experience alternate daily periods of submersion and exposure (Site A, Figure 1) withstanding extended periods of air exposure of up to 4.5-6 h per tidal cycle.…”

Section: Study Sitementioning

confidence: 99%

Short Term CO2 Enrichment Increases Carbon Sequestration of Air-Exposed Intertidal Communities of a Coastal Lagoon

2018

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In situ production responses of air-exposed intertidal communities under CO 2 enrichment are reported here for the first time. We assessed the short-term effects of CO 2 on the light responses of the net community production (NCP) and community respiration (CR) of intertidal Z. noltei and unvegetated sediment communities of Ria Formosa lagoon, when exposed to air. NCP and CR were measured in situ in summer and winter, under present and CO 2 enriched conditions using benthic chambers. Within chamber CO 2 evolution measurements were carried out by a series of short-term incubations (30 min) using an infra-red gas analyser. Liner regression models fitted to the NCP-irradiance responses were used to estimate the seasonal budgets of air-exposed, intertidal production as determined by the daily and seasonal variation of incident photosynthetic active radiation. High CO 2 resulted in higher CO 2 sequestration by both communities in both summer and winter seasons. Lower respiration rates of both communities under high CO 2 further contributed to a potential negative climate feedback, except in winter when the CR of sediment community was higher. The light compensation points (LCP) (light intensity where production equals respiration) of Z. noltei and sediment communities also decreased under CO 2 enriched conditions in both seasons. The seasonal community production of Z. noltei was 115.54 ± 7.58 g C m −2 season −1 in summer and 29.45 ± 4.04 g C m −2 season −1 in winter and of unvegetated sediment was 91.28 ± 6.32 g C m −2 season −1 in summer and 25.83 ± 4.01 g C m −2 season −1 in winter under CO 2 enriched conditions. Future CO 2 conditions may increase air-exposed seagrass production by about 1.5-fold and unvegetated sediments by about 1.2-fold.

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Ecosystem metabolism and carbon fluxes of a tidally-dominated coastal lagoon

Cited by 62 publications

References 18 publications

Benthic metabolism across a gradient of anthropogenic impact in three shallow coastal lagoons in NW Florida

Benthic metabolism across a gradient of anthropogenic impact in three shallow coastal lagoons in NW Florida

Community-level carbon flux variability over a tidal cycle in Zostera marina and Z. noltii beds

Short Term CO2 Enrichment Increases Carbon Sequestration of Air-Exposed Intertidal Communities of a Coastal Lagoon

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