Chemical composition of degrading mangrove leaf litter and changes produced after consumption by mangrove crabNeosarmatium smithi (Crustacea: Decapoda: Sesarmidae)

Neilson, Martin J.; Richards, Geoffrey N.

doi:10.1007/bf01014829

Cited by 26 publications

(9 citation statements)

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“…Living mangrove leaves contain about 50% lignocellulose, a highly refractory structural complex consisting of the aromatic heteropolymer lignin, in close physical and covalent association with the polysaccharides, cellulose and hemicellulose (Benner & Hodson 1985). The non-lignocellulose components of the leaves are mostly soluble carbohydrates that rapidly leach from the leaves after submersion in water (Neilson & Richards 1989). Although, tannins and other phenolic compounds with microbial inhibitory potential may account for a significant fraction (18%) of the DOM in mangrove leachate (Benner et al 1986), the released DOC fraction is degraded rapidly in the mangrove environment (Benner et al 1986, Kristensen & Pilgaard 2000, leaving the recalcitrant lignocellulosic detritus to be deposited and buried in the sediment.…”

Section: Carbon Oxidation and Partitioning Of Electron Acceptorsmentioning

confidence: 99%

Carbon and nitrogen mineralization in sediments of the Bangrong mangrove area, Phuket, Thailand

Kristensen¹,

Andersen²,

Holmboe³

et al. 2000

Aquat. Microb. Ecol.

146

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Carbon and nitrogen mineralization were determined along a transect from a mangrove forest to a seagrass meadow in the Bangrong area, Phuket Island, Thailand. Vertical sediment profiles of carbon oxidation were measured as sulfate reduction rates (SRR) using the 35 S technique and by monitoring net TCO 2 and DOC production and Fe(III) reduction using anaerobic sediment incubations ('jar' technique). Nitrogen transformations were measured simultaneously as net NH 4 + and DON production. In addition, total benthic metabolism and net nitrogen exchange were determined as fluxes of O 2 , TCO 2 , DOC, and DIN (NO 3 -and NH 4 + ) across the sediment-water interface. Rates of carbon and nitrogen transformations in this vascular-plant (high C:N)-dominated area were low compared with areas fuelled by detritus of marine origin (low C:N). It appears that the high content of structural biopolymers (e.g. lignocelluloses) hampers microbial activity. Suboxic respiration with Fe(III) as electron acceptor accounted for 70 to 80% of the total carbon oxidation in the rooted mangrove forest sediment, whereas SRR and aerobic respiration were responsible for about 20 and < 6%, respectively. The role of SRR decreased to about 10% and aerobic respiration increased to 45-65% in an adjacent bioturbated mudflat, while Fe(III) respiration decreased to 30-40%. At the sand flat and seagrass meadow outside the mangrove forest, Fe(III) respiration only accounted for 15 and ~0%, respectively, whereas SRR was responsible for 20 to 45% of the total carbon oxidation. However, the most important electron acceptor in the area outside was oxygen (55 to 75%). The shift in dominance of electron acceptors along the transect is primarily related to the presence of roots and infauna, but the sediment composition (e.g. grain size, organic content and iron content) is believed to be an important co-factor. The net production of ammonium in the sediment was not balanced by fluxes of DIN across the sediment-water interface. The missing nitrogen was assigned to a rapid and efficient bacterial ammonium assimilation at the sediment surface as indicated by ammonium turnover times of about 1 d. KEY WORDS: Mangrove forest · Seagrass · Carbon · Nitrogen · Mineralization · Sulfate reduction · Fe(III) reduction · Benthic metabolismResale or republication not permitted without written consent of the publisher Aquat Microb Ecol 22: 199-213, 2000 grove and seagrass environments have shown that densities are generally low compared with other marine habitats (Alongi & Sasekumar 1992). The infaunal density and diversity is particularly low within the mangrove forest, where burrowing crabs are the dominating faunal feature. These may, however, handle and consume a considerable fraction of the litter fall (Robertson 1986). Highest faunal densities are generally found on adjacent mudflats, where large populations of epibenthic mollusks graze on microphytobenthos. Tropical seagrass meadows, on the other hand, are characterized by highly diverse, but not very abundan...

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Section: Carbon Oxidation and Partitioning Of Electron Acceptorsmentioning

confidence: 99%

Carbon and nitrogen mineralization in sediments of the Bangrong mangrove area, Phuket, Thailand

Kristensen¹,

Andersen²,

Holmboe³

et al. 2000

Aquat. Microb. Ecol.

146

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“…Organic detritus produced in mangrove swamps will either be degraded and recycled in the sediments or exported to adjacent areas (Woodroffe 1985, Robertson 1986, Twilley et al 1986, Kristensen et al 1988. Although the abundant mangrove crab fauna is believed to consume significant amounts of leaf litter as a major portion of their diet (Robertson 1986, Neilson & Richards 1989, decomposition of mangrove detritus is essentially a microbially mediated process (Alongi 1989). Several reports have dealt with aspects of degradation of mangrove detritus such as litter bag studies (Boonruang 1978, Cundell et al 1979, Rice & Tenore 1981, dissolved organic matter/bacteria interactions (Benner et al 1986, Gonzalez-Farias & Mee 1988 O Inter-Research/Printed in Germany et al.…”

Section: Introductionmentioning

confidence: 99%

Benthic metabolism and sulfate reduction in a southeast Asian mangrove swamp

Kristensen¹,

Holmer²,

Bussarawit³

1991

Mar. Ecol. Prog. Ser.

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Erik ~xistensen', Marianne ~o l m e r ' , Nipavan ~u s s a r a w i t~Institute of Biology, Odense University. DK-5230 Odense M, Denmark * Phuket Marine Biological Center. PO Box 60. Phuket. 83000 Thailand ABSTRACT: Sediment metabolism (surface O2 uptake and CO2 production) and 35S-S0z-reduction (0 to 10 cm) were measured during January 1990 (dry season) a t 3 stations in the Ao Nam Bor mangrove, Phuket, Thailand. Sulfate reduction as measured by the chromium reduction technique was highest at 6 to 10 cm depth at all stations (600 to 800 nmol S dC1), indicating that significant activity may have occurred below 10 cm. Vertical translocation of metabohzable organic substrates, either due to subsurface root growth or due to downward transport of newly deposited organlc matter by bioturbation appeared responsible for the high subsurface activlty The major reduced sulfur compound at all 3 statlons was FeS2, both as recovered 35S-label In the sulfate reduction assay (82 to 97 O/O) and in the total sediment sulfur pool (86 to 100 %). Very low amounts of reduced sulfur were found as HS-, FeS and So. The general absence of HS-was caused by preclpltatlon reactions controlled by a large sedimentary Iron pool. The estimated area1 based rates of sulfate reductlon (0 to 10 cm, 28 to 50 mm01 m-'d-l) could support around 100 % (65 to 142 O/O) of the measured CO2 flux across the sediment-water interface. This implies a deficient or non-steady state COz flux since the sulfate reductlon est~mate ignored any activity occurring below 10 cm depth. Possible causes for thls deficlt may include CO2 assimilation by roots, advective loss of pore water COz, and excessive CO2 gas loss during alr exposure. In general, the mechanisms underlying carbon and sulfur cycling In thls mangrove swamp appears remarkably similar to those operating in salt marshes.

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“…Although the carbon, energy, and nutrients in the detritus/sediment of mangrove communities are derived from a variety of sources, the main source is mangrove leaf litter and roots Alongi 2014). Mangrove detritus, however, has a high C/N ratio (it often exceeds 100) and often contains high concentrations of feeding deterrents, such as polyphenolics and tannins (Neilson and Richards 1989;Lee 2008), which can hinder the foraging and assimilation of the detritus by macrobenthic fauna (Lee 1999). Compared to the unvegetated shoal, the mature mangrove forest has a dense plant community, and most of the detritus is derived from mangroves, which may reduce the food available for detritivorous macrobenthic fauna.…”

Section: Discussionmentioning

confidence: 99%

Changes in the functional feeding groups of macrobenthic fauna during mangrove forest succession in Zhanjiang, China

Chen

Zhao

Jian

et al. 2018

Ecological Research

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Understanding the relationships between mangrove forest succession and the functional diversity of mangrove fauna could facilitate the restoration of mangrove ecosystems, which have been severely damaged in recent decades. The current report describes changes in macrobenthic functional diversity in a mangrove chronosequence that included a primary community (unvegetated shoal), an early community (Avicennia marina), a middle community (Aegiceras corniculatum), and a late community (Bruguiera gymnorrhiza + Rhizophora stylosa) in Zhanjiang, China. Phytophages were the dominant macrobenthic functional feeding group regardless of mangrove succession stage, sampling season, or macrobenthic faunal parameter (species richness, abundance, and biomass). As mangrove succession progressed, the proportions of macrobenthic species richness, abundance, or biomass represented by omnivores significantly increased (except for biomass and in the late stage; ranged from 0.065 to 0.230 and 0.033 to 0.368, respectively in wet season, and 0.000 to 0.192 and 0.000 to 0.396, respectively in dry season), while the proportions significantly decreased for detritivores during the dry season (ranged from 0.156 to 0.056, 0.107 to 0.019, and 0.066 to 0.005, respectively). Non‐metric multi‐dimensional scaling and PERMANOVA also indicated that the structure of macrobenthic faunal functional feeding groups was significantly affected by mangrove succession. Further analyses indicated that the changes in the relative dominance among macrobenthic faunal functional feeding groups during mangrove succession were mainly associated with changes in plant density, coverage/canopy density, and total nitrogen content of sediment, i.e., they were mostly associated with changes in food sources. The results increase our understanding of the relationship between benthic functional diversity and mangrove succession and could help guide mangrove restoration in China and around the world.

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Chemical composition of degrading mangrove leaf litter and changes produced after consumption by mangrove crabNeosarmatium smithi (Crustacea: Decapoda: Sesarmidae)

Cited by 26 publications

References 34 publications

Carbon and nitrogen mineralization in sediments of the Bangrong mangrove area, Phuket, Thailand

Carbon and nitrogen mineralization in sediments of the Bangrong mangrove area, Phuket, Thailand

Benthic metabolism and sulfate reduction in a southeast Asian mangrove swamp

Changes in the functional feeding groups of macrobenthic fauna during mangrove forest succession in Zhanjiang, China

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