Tidal export of particulate organic matter from a Northern Australian mangrove system

Boto, Kevin; Bunt, J. S.

doi:10.1016/s0302-3524(81)80023-0

Cited by 223 publications

(85 citation statements)

References 5 publications

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“…Wafar et al (1997) found high bacterial biomass in a mangrove-intertidal flat ecosystem at the MandoviZuari Estuary (India). They concluded In a comparable ecosystem, Boto & Bunt (1981) that this high biomass could only be maintained by assumed that such high C:N ratio values in intertidal mangrove forest export. However, at Oura Bay the sediments were related to mangrove export.…”

Section: Fatty Acid Markers In Macrozoobenthosmentioning

confidence: 99%

Fatty acids as tracers of organic matter in the sediment and food web of a mangrove/intertidal flat ecosystem, Okinawa, Japan

Méziane¹,

Tsuchiya²

2000

Mar. Ecol. Prog. Ser.

177

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Surface sediments and marine invertebrates, collected from 2 intertidal flats on Okinawa Island, 1 adjacent to a mangrove system, were analysed for fatty acid composition. The detection of fatty acid markers found in mangrove leaves in the organic matter of the surface sediments, coupled with measurements of C:N ratios, showed that organic matter from the mangrove forest (in Oura Bay) is exported to the intertidal flat in both the rainy season and the dry season. This export seems to be higher in the rainy season. However, bacteria, diatoms and macroalgae were the main food source in the surface sediments, as shown by the contribution of their respective fatty acid markers. These markers were also detected in the tissues of the dominant macrozoobenthic species, fiddler crabs and gastropods. Bacteria and green macroalgae were the primary food sources ingested at both sites, irrespective of season. The organic matter derived from mangroves was also ingested by the macrozoobenthos of Oura Bay, while markers of higher plants were not found in the tissues of invertebrate species at Itoman intertidal flat, the site that was not adjacent to a mangrove system.

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Section: Fatty Acid Markers In Macrozoobenthosmentioning

confidence: 99%

Fatty acids as tracers of organic matter in the sediment and food web of a mangrove/intertidal flat ecosystem, Okinawa, Japan

Méziane¹,

Tsuchiya²

2000

Mar. Ecol. Prog. Ser.

177

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“…These authors suggested that the sediment DOC concentrations were linked, at a lag of 2 to 3m0, with seasonal fluctuations in phytoplankton densities. Such a link would be highly unlikely in the tropical mangrove system owing to the much lower densities of benthic microalgae (Alongi 1988a) and phytoplankton (Boto & Bunt 1981) in this system.…”

Section: Doc Variation With Depth and Position In The Intertidal Zonementioning

confidence: 99%

Dissolved organic carbon-bacteria interactions at sediment-water interface in a tropical mangrove system

Boto¹,

Alongi²,

Nott³

1989

Mar. Ecol. Prog. Ser.

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In order to determine the efficiency of in situ carbon recycling in tropical mangrove sediments, and the contribution of porewater dissolved organic carbon (DOC) to surface-sediment bacterial production, concentrations and fluxes of DOC were measured and compared with simultaneous estimates of bacterial densities, productivity and specific growth rates, in a mangrove forest in Queensland, Australia. The range of interstitial DOC concentrations (4 to 50mgC 1 ' ) was similar to that reported for temperate marine sediments although seasonal variations were much less apparent. Soluble tannins constituted 2 to 51 % of the interstitial DOC pools, which varied significantly with tidal elevation (high > mid > low intertidal) and showed significant variation with sediment depth (to 1 m) only in the mid intertidal. Bacterial densities and activity in surface sediments (to 1 cm) were high (annual range in productivity: 0.9 to 4.1 gC m-* d ' ) , consistent with previous estimates at this site. Surface (1 cm depth) sediment DOC concentrations varied with elevation in the intertidal zone (10 sites from low to high intertidal), and showed no correspondence with seasonal or spatial variations in bacterial parameters, except for a significant correlation (r= 0.71, n = 10) between DOC and bacterial growth rate, in austral autumn, for samples throughout the tidal range. Despite the high concentration gradient of DOC between porewaters and overlying tidal waters, significant efflux of DOC was rarely detected unless sediments were poisoned, to 1 cm depth, with mercury, which resulted in significant and generally high rates of efflux. Efflux rates varied widely with tidal elevation and season (range: 0 to 2 . 4 gC m-' d"') These DOC flux rates provide, on average, 35 % (range: 0 to 100 O h ) of bacterial productivity requirements at the sediment-water interface. This study suggests that the mangrove sediments function as an efficient sink for DOC and that its export from the system is minor.

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“…Mangrove swamps are considered to be productive ecosystems, in which the rate of primary productivity is high (Heald, 1971;Odum and Heald, 1972;Boto and Bunt, 1981). This high productivity is often attributed to high litter degradation rates and efficient recycling of nutrients, which are supplied by both autochthonous litter and allochthonous inputs from natural and anthropogenic sources (Lee, 1990;Kazungu et al, 1993;Bouillon et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Litter degradation and CN dynamics in reforested mangrove plantations at Gazi Bay, Kenya

Bosire

Dahdouh‐Guebas

Kairo

et al. 2005

Biological Conservation

102

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The main objective of this study was to assess how mangrove reforestation has influenced litter degradation and concomitant nutrient dynamics in previously deforested plantations. Dynamics of nutrients (carbon, nitrogen and C:N ratios) in decomposing leaves of conspecific species were investigated with litterbags in Sonneratia alba and Rhizophora mucronata reforested treatments using appropriate bare and natural less disturbed treatments as controls. Bare treatments had the lowest decay rates (Kd À1) and thus the highest t 50 values (when 50% of the original weight had been decomposed) for both species. The contrary was true for natural treatments, while both parameters were intermediate in reforested treatments, suggesting that other than direct litter input, reforestation has modified site conditions which have enhanced organic matter decomposition. There were significant seasonal differences in decay rates for treatments within the R. mucronata species, with rates being higher during the wet season with accompanying lower t 50 values. Decay rates were overall higher (P < 0.05) in the S. alba species and as a result no litter was retrieved from its natural treatment by the 5th week. Higher amphipod colonisation was observed in reforested and natural treatments than bare treatments, which may have contributed to higher decay rates in the former. There were significant differences (P < 0.05) in N concentration among treatments with natural and reforested treatments having similarly higher concentrations than bare treatments in both seasons. C:N ratios (an important determinant of nutritional leaf quality) were also similarly low in natural and reforested treatments and higher in bare treatments. Mangrove reforestation thus seems to have enhanced litter degradation and concomitant nutrient remineralisation, suggesting that other than species litter quality, tidal inundation and seasonal factors, specific stand management regimes play an important role in determining the efficiency of these ecological processes in mangrove ecosystems.

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Tidal export of particulate organic matter from a Northern Australian mangrove system

Cited by 223 publications

References 5 publications

Fatty acids as tracers of organic matter in the sediment and food web of a mangrove/intertidal flat ecosystem, Okinawa, Japan

Fatty acids as tracers of organic matter in the sediment and food web of a mangrove/intertidal flat ecosystem, Okinawa, Japan

Dissolved organic carbon-bacteria interactions at sediment-water interface in a tropical mangrove system

Litter degradation and CN dynamics in reforested mangrove plantations at Gazi Bay, Kenya

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