Benthic microbial metabolism in seagrass meadows along a carbonate gradient in Sulawesi, Indonesia

Alongi, Daniel M.; Trott, Lindsay; Undu, M C; Tirendi, Frank

doi:10.3354/ame01191

Cited by 16 publications

(12 citation statements)

References 39 publications

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“…and Zostera noltii, respectively ( Table 1). From all the seagrass species analyzed here, Enhalus acoroides is the only one for which CH 4 production rates were previously reported (Alongi et al, 2008), with very similar values. The CH 4 production rate reported for this seagrass in Indonesia was on average 118.8 µmol CH 4 m −2 d −1 (ranging from 4.5 to 233.1 µmol CH 4 m −2 d −1 ) and the rate reported here for the Red Sea was 115.6 ± 23.7 µmol CH 4 m −2 d −1 (Table 2) for the single sampling on April and 96.2 ± 17.9 µmol CH 4 m −2 d −1 when averaging the rates measured along a year (Figure 5).…”

Section: Discussionsupporting

confidence: 65%

“…Similarly, CH 4 fluxes were more than 4-fold higher in Zostera noltii sediments compared to bare sediments in a temperate intertidal system (12.8 and 3 µmol CH 4 m −2 h −1 , respectively) (Bahlmann et al, 2015), and Alongi et al (2008) reported an increase in CH 4 release associated to an increase in seagrass productivity. Altogether, our findings and consistent literature reports suggest that organic exudates from seagrasses are fueling a complex microbial community including methanogenic Archea.…”

Section: Discussionmentioning

confidence: 99%

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Methane Production by Seagrass Ecosystems in the Red Sea

Garcías-Bonet

Duarte

2017

Front. Mar. Sci.

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Atmospheric methane (CH 4 ) is the second strongest greenhouse gas and it is emitted to the atmosphere naturally by different sources. It is crucial to define the dimension of these natural emissions in order to forecast changes in atmospheric CH 4 mixing ratio in future scenarios. However, CH 4 emissions by seagrass ecosystems in shallow marine coastal systems have been neglected although their global extension. Here we quantify the CH 4 production rates of seagrass ecosystems in the Red Sea. We measured changes in CH 4 concentration and its isotopic signature by cavity ring-down spectroscopy on chambers containing sediment and plants. We detected CH 4 production in all the seagrass stations with an average rate of 85.09 ± 27.80 µmol CH 4 m −2 d −1 . Our results show that there is no seasonal or daily pattern in the CH 4 production rates by seagrass ecosystems in the Red Sea. Taking in account the range of global estimates for seagrass coverage and the average seagrass CH 4 production, the global CH 4 production and emission by seagrass ecosystems could range from 0.09 to 2.7 Tg yr −1 . Because CH 4 emission by seagrass ecosystems had not been included in previous global CH 4 budgets, our estimate would increase the contribution of marine global emissions, hitherto estimated at 9.1 Tg yr −1 , by about 30%. Thus, the potential contribution of seagrass ecosystems to marine CH 4 emissions provides sufficient evidence of the relevance of these fluxes as to include seagrass ecosystems in future assessments of the global CH 4 budgets.

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Section: Discussionsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Methane Production by Seagrass Ecosystems in the Red Sea

Garcías-Bonet

Duarte

2017

Front. Mar. Sci.

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“…We have only considered in this study fluxes of organic C, however, mangrove waters have been observed to be significant sources of CO 2 (Borges et al, 2003). It has been suggested that the export of inorganic C during tidal inundation could exceed the organic fraction (Alongi et al, 2008;Bouillon et al, 2008). The exchange of inorganic C during tidal inundation also requires attention in order to obtain an accurate net C exchange of the mangrove forest with the coastal zone (Bouillon et al, 2008;Alongi, 2009).…”

Section: Mangrove Exchange Of Doc With the Coastal Oceanmentioning

confidence: 97%

Carbon and nutrient exchange of mangrove forests with the coastal ocean

2010

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Mangrove forests exchange materials with the coastal ocean through tidal inundation. In this study, we aim to provide an overview of the published data of carbon (C) and nutrient exchange of mangrove forests with the coastal ocean at different spatial scales to assess whether the exchange is correlated with environmental parameters. We collected data on C (dissolved and particulate organic C; DOC and POC) and nutrient exchange (dissolved and particulate nitrogen, N and phosphorus, P) and examined the role of latitude, temperature, precipitation, geomorphological setting, hydrology, dominant mangrove species and forest area in explaining the variability of the exchange. We identified that there are a range of methodologies used to determine material exchange of mangroves with the coastal zone, each methodology providing data on the exchange at different spatial scales. This variability of approaches has limited our understanding of the role of mangroves in the coastal zone. Regardless, we found that mangrove forests export C and nutrients to the coastal zone in the form of litter and POC. We found that precipitation is a major factor influencing the export of C in the form of litter; sites with low annual precipitation and high mean annual temperatures export more C as litter than sites with high precipitation and low temperature. Furthermore, export of POC is higher in zones with low mean annual minimum temperature. Identification of broad-scale trends in DOC and dissolved nutrients was more difficult, as the analysis was limited by scarcity of suitable studies and high variability in experimental approaches. However, tidal amplitude and the concentration of nutrients in the floodwater appears to be important in determining nutrient exchange. The strongest conclusion from our analysis is that mangrove forests are in general sources of C and nutrients in the form of litter and POC and that they are most likely to be exporting C subsidies in dry regions.

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“…Indonesia also houses the world's largest expanse of mangrove forest (~2 930 000 ha), but has experienced an inexorable decline in forest area (FAO 2003). Mangroves, however, are adaptable and resilient to dynamic shoreline change caused by increased sedimentation due to changes in land use (Alongi 2008); mangroves have undergone almost continual disturbance as a result of fluctuations in sea level over the last few thousand years (Woodroffe 2002, Bird 2008. In the face of environmental change, mangroves shift their shoreline position, readily colonizing newly deposited sediments.…”

Section: Abstract: Carbon · Greenhouse Gases · Mangrove · Nitrogen ·mentioning

confidence: 99%

“…Such interrelationships are most evident where degradation of the coastal environment is accelerating, such as throughout Southeast Asia. In Indonesia, as in other regional countries, increased deforestation and coastal development has led to enhanced land erosion and subsequent transport of catchment soils to the coastal zone (Minura 2006); sedimentation has increased since the 1970s to the extent that fringing reefs are disappearing, leading to colonization of the recently deposited soil drapes by mangroves and seagrass beds (Budiman et al 1986, Yulianto et al 2004, Alongi et al 2008, Sekiguchi & Aksornkoae 2008.…”

Section: Introductionmentioning

confidence: 99%