Biomass and litterfall of Ceriops tagal and Rhizophora mucronata in the mangrove forest of Gazi Bay, Kenya

Slim, Frederik J.; Gwada, P.; Kodjo, M.; Hemminga, M.A.

doi:10.1071/mf9960999

Cited by 71 publications

(41 citation statements)

References 26 publications

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“…Higher export from forests dominated by Avicennia sp., compared to those dominated by Rhizophora sp., has been observed in Brazil and related to different detritus decomposition rates (Lacerda et al, 1995). Moreover, the differing seasonal patterns recorded in Gazi Bay for A. marina and R. mucronata litterfall further corroborate this point: A. marina litterfall is higher in the rainy season than in the dry (Ochieng and Erftemeijer, 2002), while R. mucronata litterfall is the opposite (Slim et al, 1996). Indeed, the sediment C : N ratio in the Kidogoweni stand was almost 2-fold higher in the dry season than in the rainy (20.8 ± 0.6 vs. 11.6 ± 1.3).…”

Section: Export Of Mangrove Organic Mattersupporting

confidence: 70%

Small-scale variability in geomorphological settings influences mangrove-derived organic matter export in a tropical bay

et al. 2017

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Abstract. Organic matter (OM) exchanges between adjacent habitats affect the dynamics and functioning of coastal systems, as well as the role of the different primary producers as energy and nutrient sources in food webs. Elemental (C, N, C : N) and isotope (δ 13 C) signatures and fatty acid (FA) profiles were used to assess the influence of geomorphological setting in two climatic seasons on the export and fate of mangrove OM across a tidally influenced tropical area, Gazi Bay (Kenya). The main results indicate that tidal transport, along with riverine runoff, plays a significant role in the distribution of mangrove organic matter. In particular, a marked spatial variability in the export of organic matter from mangroves to adjacent habitats was due to the different settings of the creeks flowing into the bay. Kinondo Creek acted as a mangrove retention site, where export of mangrove material was limited to the contiguous intertidal area, while Kidogoweni Creek acted as a "flow-through" system, from which mangrove material spreads into the bay, especially in the rainy season. This pattern was evident from the isotopic signature of primary producers, which were more 13 C-depleted in the Kinondo Creek and nearby, due to the lower dilution of the dissolved inorganic carbon (DIC) pool, typically depleted as an effect of intense mangrove mineralisation. Despite the trapping efficiency of the seagrass canopy, suspended particulate OM showed the important contribution of mangroves across the whole bay, up to the coral reef, as an effect of the strong ebb tide. Overall, mixing model outcomes indicated a widespread mixed contribution of both allochthonous and autochthonous OM sources across Gazi Bay. Moreover, FAs indicated a notable contribution of brown macroalgae and bacteria in both sediment and suspended pools. These results suggest that ecological connectivity in Gazi Bay is strongly influenced by geomorphological setting, which may have far-reaching consequences for the functioning of the whole ecosystem and the local food webs.

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Section: Export Of Mangrove Organic Mattersupporting

confidence: 70%

Small-scale variability in geomorphological settings influences mangrove-derived organic matter export in a tropical bay

et al. 2017

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“…Spring tidal range in Gazi bay is reported to be 3.2 m (Kitheka, 1997). T. ciliatum production in the bay has been estimated to range between 710 and 1365 g C m −2 y −1 (Hemminga et al, 1995); litterfall data for C. tagal, R. mucronata, and A. marina correspond to litter production of 164, 412, and 236 g C m −2 y −1 , respectively (Slim et al, 1996b;Ochieng and Erftenmeijer, 2002).…”

Section: Study Site and Sampling Methodsmentioning

confidence: 99%

Carbon sources supporting benthic mineralization in mangrove and adjacent seagrass sediments (Gazi Bay, Kenya)

2004

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Abstract. The origin of carbon substrates used by in situ sedimentary bacterial communities was investigated in an intertidal mangrove ecosystem and in adjacent seagrass beds in Gazi bay (Kenya) by δ 13 C analysis of bacteria-specific PLFA (phospholipid fatty acids) and bulk organic carbon. Export of mangrove-derived organic matter to the adjacent seagrasscovered bay was evident from sedimentary total organic carbon (TOC) and δ 13 C TOC data. PLFA δ 13 C data indicate that the substrate used by bacterial communities varied strongly and that exported mangrove carbon was a significant source for bacteria in the adjacent seagrass beds. Within the intertidal mangrove forest, bacterial PLFA at the surface layer (0-1 cm) typically showed more enriched δ 13 C values than deeper (up to 10 cm) sediment layers, suggesting a contribution from microphytobenthos and/or inwelled seagrass material.Under the simplifying assumption that seagrasses and mangroves are the dominant potential end-members, the estimated contribution of mangrove-derived carbon to benthic mineralization in the seagrass beds (16-74%) corresponds fairly well to the estimated contribution of mangrove C to the sedimentary organic matter pool (21-71%) across different seagrass sites. Based on the results of this study and a compilation of literature data, we suggest that trapping of allochtonous C is a common feature in seagrass beds and often represents a significant source of C for sediment bacteria -both in cases where seagrass C dominates the sediment TOC pool and in cases where external inputs are significant. Hence, it is likely that data on community respiration rates systematically overestimate the role of in situ mineralization as a fate of seagrass production.

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“…Some of the former allometric equations on mangroves which used only the variable of DBlFH (Ong et at., 1982;Suzuki et at., 1983;Kusmana et at., 1992), or D (Clough et at., 1989;Slim et at., 1996;Clough et at., 1997) should be sitedependent, especially for branch and leaf weights. Although the measurement of DBH and H is relatively easy in the field compared to the DB measurement, Kanto (1999) and Matsushita et at.…”

Section: Discussionmentioning

confidence: 99%

Site-independent allometric relationships for estimating above-ground weights of mangroves

Poungparn

Komiyama

Patanaponpaipoon

et al. 2003

Tropics

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Site-independent allometric relationships for above-ground weight were studied for three groups of mangroves: Rhizophora, Bruguiera, and other species. A hundred and one tree samples were collected from five forest sites where a major difference is geographical locality. For stem weight, a site-independent allometric relationship using the variable DBH'H or DROiH (D"", = stem diameter at 30 cm above the highest prop root) was attained for each group, because the specific gravity of wood and overall stem shape are identical among the trees of the different sites. Although some mangroves showed difference in specific gravity of wood among different sites, this difference was not large enough to effect the site segregation of the allometric relationship for stem weight. The allometric relationships for the branch and leaf weights of all studied mangroves differed by site when we used DBH'H or DROiH as an independent variable. However, when we used the stem diameter at the height of the lowest branch DB as an independent variable, the difference in allometric relationships for both branch and leaf weights among sites became smaller. We discussed the application of the Pipe Model (Shinozaki et ai. 1964) for establishing site-independent allometric relationships common to a variety of geographically distinct mangroves.

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Biomass and litterfall of Ceriops tagal and Rhizophora mucronata in the mangrove forest of Gazi Bay, Kenya

Cited by 71 publications

References 26 publications

Small-scale variability in geomorphological settings influences mangrove-derived organic matter export in a tropical bay

Small-scale variability in geomorphological settings influences mangrove-derived organic matter export in a tropical bay

Carbon sources supporting benthic mineralization in mangrove and adjacent seagrass sediments (Gazi Bay, Kenya)

Site-independent allometric relationships for estimating above-ground weights of mangroves

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