Oxygen production and consumption associated with the major autotrophic components in two temperate seagrass communities

Murray, Laura; Wetzel, R. G.

doi:10.3354/meps038231

Cited by 75 publications

(55 citation statements)

References 25 publications

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“…8A). These results highlight the important finding that the metabolic status of a seagrass meadow cannot be determined from a single sampling season (Murray & Wetzel 1987, Ziegler & Benner 1998, but must be integrated over all seasons.…”

Section: Long Timescales: Monthly To Seasonalmentioning

confidence: 93%

Multiple timescale processes drive ecosystem metabolism in eelgrass (Zostera marina) meadows

Rheuban¹,

Berg²,

McGlathery³

2014

Mar. Ecol. Prog. Ser.

106

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Section: Long Timescales: Monthly To Seasonalmentioning

confidence: 93%

Multiple timescale processes drive ecosystem metabolism in eelgrass (Zostera marina) meadows

Rheuban¹,

Berg²,

McGlathery³

2014

Mar. Ecol. Prog. Ser.

106

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“…5) over the course of the year, a pattern remarkably similar to that found by Moore et al (1997) from chamber incubations. This is likely due to increased sediment heterotrophic respiration (Murray andWetzel 1987, Moore et al 1997) and Z. marina respiratory requirements with higher temperatures (Marsh et al 1986), as well as to the seasonal variation in plant biomass ( Table 1) and detritus. Although the two relationships were similar (Fig.…”

Section: Discussionmentioning

confidence: 99%

Ecosystem metabolism along a colonization gradient of eelgrass (Zostera marina) measured by eddy correlation

Rheuban

Berg

McGlathery

2014

Limnology & Oceanography

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The Virginia coastal bays experienced local extinction of eelgrass (Zostera marina) during the early 1930s, and restoration beginning in 2001 has generated an ecosystem state change from bare to vegetated sediments. Oxygen fluxes were measured seasonally using the eddy correlation technique at three sites representing different stages of seagrass colonization: unvegetated (bare), 5 yr, and 11 yr since seeding. Derived seasonal ecosystem respiration (R) and gross primary production (GPP) increased up to 10-fold and 25-fold, respectively, with meadow age. Although hourly oxygen (O 2 ) fluxes were highly correlated with light at the vegetated sites, no identifiable trends with light were observed at the bare site. The light compensation point where O 2 production and respiration are in balance increased from 46 mmol photons m 22 s 21 to 257 mmol photons m 22 s 21 and 63 mmol photons m 22 s 21 to 472 mmol photons m 22 s 21 at the 5 yr and 11 yr seagrass sites, respectively, with increasing seasonal temperatures from 12.3uC to 27.9uC and 9.3uC to 30.5uC, respectively. This suggests that more light, and thus more O 2 production, is required to offset increasing respiration with both temperature and meadow age. Photosynthesisirradiance curves generated from hourly O 2 fluxes throughout the seasons were used to estimate annual net ecosystem metabolism (NEM). Annual NEM rates at the bare, 5 yr, and 11 yr sites were 27.6, 8.6, and 27.0 mol O 2 m 22 yr 21 , respectively. Although the system went through a period of net autotrophy during early stages of colonization, the ecosystem state change from unvegetated sediments to dense seagrass meadows changed the magnitude of both GPP and R, but not the overall metabolic balance of the system.

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“…Benthic micro-algae are a common component of seagrass beds (e.g. Murray & Wetzel 1987, Moncreiff et al 1992, this study). Our technique is, however, based on the use of specific bacterial biomarkers, which makes the absolute separation of plant, microalgal and bacterial material possible.…”

Section: Discussionmentioning

confidence: 99%

Limited coupling of macrophyte production and bacterial carbon cycling in the sediments of Zostera spp. meadows

boschker¹,

Wielemaker²,

Schaub³

et al. 2000

Mar. Ecol. Prog. Ser.

100

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Two approaches were used to study coupling between seagrass production and bacterial processes in the rhizosphere. In the first approach, stable carbon-isotope ratios of bacteria, sediment organic matter and plants were determined to infer sources of organic carbon used by bacteria in the sediments of 4 European Zostera marina and 2 Z. noltii meadows. Bacterial isotope ratios were derived from bacteria-specific polar lipid-derived fatty acids (PLFA), mainly methyl-branched i15:0 and a15:0. Bacterial δ 13 C ratios in the sediment from both vegetated and unvegetated sites were mostly similar and did not resemble Z. marina ratios, suggesting that seagrass material was of limited importance as a bacterial carbon source. Bacterial ratios were in most cases similar to benthic macroalgae and did correlate well with ratios of diatom biomarkers. Sediment organic matter inside the meadows had δ 13 C ratios similar to those of nearby unvegetated sites, and ratios were clearly different from the material produced by seagrasses, indicating that little seagrass material accumulated. Results from the 2 Z. noltii sites were less conclusive, as there was no clear difference in δ 13 C ratios between the potential source materials. In addition, bacterial δ 13 C ratios were highly variable at one Z. noltii site. In the second approach, cultured Z. marina was labeled with 13 C-bicarbonate to study the short-term transfer of label from plants to bacteria in the rhizosphere. However, no label was detected in bacterial PLFA after 20 h of incubation. In conclusion, a close coupling between macrophyte production and bacterial carbon cycling could not be detected in the sediment of Z. marina meadows, and benthic production by algae was probably the main carbon source for bacterial growth.KEY WORDS: Seagrass meadows · Bacterial carbon sources · Sediment · Stable carbon isotopes · Biomarkers · Zostera marina · Zostera noltii Resale or republication not permitted without written consent of the publisher

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Oxygen production and consumption associated with the major autotrophic components in two temperate seagrass communities

Cited by 75 publications

References 25 publications

Multiple timescale processes drive ecosystem metabolism in eelgrass (Zostera marina) meadows

Multiple timescale processes drive ecosystem metabolism in eelgrass (Zostera marina) meadows

Ecosystem metabolism along a colonization gradient of eelgrass (Zostera marina) measured by eddy correlation

Limited coupling of macrophyte production and bacterial carbon cycling in the sediments of Zostera spp. meadows

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