Driving Forces Behind Nutrient and Organic Matter Dynamics in a Mangrove Tidal Creek in North Brazil

Dittmar, Thorsten; Lara, R. J.

doi:10.1006/ecss.2000.0743

Cited by 198 publications

(105 citation statements)

References 28 publications

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“…Kristensen et al, 2000;Davis et al, 2001). The potential exchange of dissolved solutes through advective porewater seepage has been proposed previously for certain mangrove systems (Ovalle et al, 1990;Dittmar and Lara, 2001;Borges et al, 2003;Barnes et al, 2006), but was found to be insignificant in others (Kristensen and Suraswadi, 2002). Such exchange mechanisms have also been proposed for salt marsh systems (Cai et al, 1999), intertidal sand flats (Billerbeck et al, 2006a, b), and tidal freshwater marshes (Neubauer and Anderson, 2003;Gribsholt et al, 2005).…”

Section: Introductionmentioning

confidence: 71%

Importance of intertidal sediment processes and porewater exchange on the water column biogeochemistry in a pristine mangrove creek (Ras Dege, Tanzania)

et al. 2007

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Abstract. We sampled a tidal creek (Ras Dege, Tanzania) during a 24-h cycle to document the variations in a suite of creek water column characteristics and to determine the relative influence of tidal and biological driving forces. Since the creek has no upstream freshwater inputs, highest salinity was observed at low tide, due to evaporation effects and porewater seepage. Total suspended matter (TSM) and particulate organic carbon (POC) showed distinct maxima at periods of highest water flow, indicating that erosion of surface sediments and/or resuspension of bottom sediments were an important source of particulate material. Dissolved organic carbon (DOC), in contrast, varied in phase with water height and was highest at low tide. Stable isotope data of POC and DOC displayed large variations in both pools, and similarly followed the variations in water height. Although the variation of δ 13 C DOC (−23.8 to −13.8‰) was higher than that of δ 13 C POC (−26.2 to −20.5‰), due to the different endmember pool sizes, the δ 13 C signatures of both pools differed only slightly at low tide, but up to 9‰ at high tide. Thus, at low tide both DOC and POC originated from mangrove production. At high tide, however, the DOC pool had signatures consistent with a high contribution of seagrass-derived material, whereas the POC pool was dominated by marine phytoplankton. Daily variations in CH 4 , and partial pressure of CO 2 (pCO 2 ) were similarly governed by tidal influence and were up to 7-and 10-fold higher at low tide, which stresses the importance of exchange of porewater and diffusive fluxes to the water column. When assuming that the high dissolved Correspondence to: S. Bouillon (steven.bouillon@vub.ac.be) inorganic carbon (DIC) levels in the upper parts of the creek (i.e. at low tide) are due to inputs from mineralization, δ 13 C data on DIC indicate that the organic matter source for mineralization had a signature of −22.4‰. Hence, imported POC and DOC from the marine environment contributes strongly to overall mineralization within the mangrove system. Our data demonstrate how biogeochemical processes in the intertidal zone appear to be prominent drivers of element concentrations and isotope signatures in the water column, and how pathways of dissolved and particulate matter transport are fundamentally different.

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Section: Introductionmentioning

confidence: 71%

Importance of intertidal sediment processes and porewater exchange on the water column biogeochemistry in a pristine mangrove creek (Ras Dege, Tanzania)

et al. 2007

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“…In general, mangrove carbon appears to be the dominant source of DOC, although the contribution of local phytoplankton production has been found to be significant in some cases. Lara and Dittmar [1999] and Dittmar and Lara [2001a] estimated the latter at $8% of the total DOC pool, and Kristensen and Suraswadi [2002] suggested this contribution to be between 10 and 40%. Moran et al [1991] estimated about 30% of the DOC pool in a mangrove swamp in the Bahamas to be algal-derived during low tide, and even higher during high tide.…”

Section: Sources and Distribution Of Organic Carbonmentioning

confidence: 99%

Inorganic and organic carbon biogeochemistry in the Gautami Godavari estuary (Andhra Pradesh, India) during pre‐monsoon: The local impact of extensive mangrove forests

Bouillon

Frankignoulle

Dehairs

et al. 2003

Global Biogeochemical Cycles

150

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[1] The distribution and sources of organic and inorganic carbon were studied in the Gautami Godavari estuary (Andhra Pradesh, India) and in a mangrove ecosystem in its delta during pre-monsoon. In the oligohaline and mesohaline section (salinity 0-15) of the estuary, internal production of total alkalinity (TAlk) and dissolved inorganic carbon (DIC) was recorded, and the d 13 C DIC profile suggests that carbonate dissolution may be an important process determining the DIC dynamics in this section of the Godavari. The partial pressure of CO 2 (pCO 2 ) was fairly low along the entire salinity gradient, (293-500 ppm), but much higher and more variable (1375-6437 ppm) in the network of tidal mangrove creeks in the delta. Here, variations in the concentration and d 13 C of the DIC pool were shown to result largely from the mineralization of organic matter. The present study clearly identifies the mangrove creeks as an active site of mineralization and CO 2 efflux to the atmosphere, but shows that these changes in the aquatic biogeochemistry are a localized feature, rapidly fading in the adjacent Kakinada Bay. Our data indicate that mineralization of dissolved organic carbon (DOC) of mangrove origin, and its subsequent efflux as CO 2 to the atmosphere may represent an important fate for mangrove carbon. Although further quantification of this process in a variety of systems is required, we suggest that some of the current ideas on the role of mangroves in the carbon budget of the coastal zone may need to be reconsidered. INDEX TERMS: 4235

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“…Demikian halnya dengan kadar fosfat yang ada di perairan akan berfluktuasi secara musiman. Menurut Dittmar and Lara (2001) penaikan massa air juga dapat berlangsung di pesisir (tidal outwelling). Peristiwa ini juga dapat mengakibatkan perubahan kadar nutrien dan karbon organik terlarut di perairan pesisir.…”

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Distribution of Gastropoda and Its Relation With Environmental Characteristics in Coastal Waters of Nusalaut Island, Central Maluku

Islami

2015

J. Ilmu dan Teknologi Kelautan Tropis

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Driving Forces Behind Nutrient and Organic Matter Dynamics in a Mangrove Tidal Creek in North Brazil

Cited by 198 publications

References 28 publications

Importance of intertidal sediment processes and porewater exchange on the water column biogeochemistry in a pristine mangrove creek (Ras Dege, Tanzania)

Importance of intertidal sediment processes and porewater exchange on the water column biogeochemistry in a pristine mangrove creek (Ras Dege, Tanzania)

Inorganic and organic carbon biogeochemistry in the Gautami Godavari estuary (Andhra Pradesh, India) during pre‐monsoon: The local impact of extensive mangrove forests

Distribution of Gastropoda and Its Relation With Environmental Characteristics in Coastal Waters of Nusalaut Island, Central Maluku

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