Microbial degradation of the leachable and lignocellulosic components of leaves and wood from Rhizophora mangle in a tropical mangrove swamp

Benner, Ronald; Hodson, Robert E.

doi:10.3354/meps023221

Cited by 129 publications

(69 citation statements)

References 17 publications

(7 reference statements)

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“…Others have found that acidic conditions are favorable to fungal growth and activity (Traaen 1980;Hall et al 1980). The acidic conditions in the Okefenokee Swamp are, nonetheless, inhibitory to lignocellulose biodegradation (Benner et al 1985). Those results, together with the present data, suggest that acidification of wetlands and other aquatic systems, whether naturally or anthropogenically induced, may increase the relative proportion of fungi but will decrease the overall rates of lignocellulose transformations.…”

Section: Discussionsupporting

confidence: 71%

“…The procedures used to prepare and characterize specifically radiolabeled [l 4 Cpolysaccharidellignocellulose and [ 14C-ligninllignocellulose are described elsewhere (Benner et al 1984a Research sites and sample collectionDecaying plant material from surface sediments and water were collected from four sources: a salt marsh on Sapelo Island, Georgia; a mangrove swamp on Andros Island, Bahamas; the Okefenokee Swamp in southern Georgia; and the Big Cypress Swamp in southwest Florida. These four aquatic ecosystems were chosen to represent a temperate marine wetland, a tropical marine wetland, a temperate freshwater wetland, and a tropical freshwater wetland.…”

Section: Methodsmentioning

confidence: 99%

“…Lignocellulose degradation experimentsTen-milliliter portions of homogenized water-detritus samples were incubated with 10 mg of radiolabeled lignocellulose in 125-ml milk dilution bottles equipped with gassing ports (Benner et al 1984a). The specifically labeled lignocellulose preparation used in each experiment was derived from the same species of plant as the decaying plant material used as the source of inoculum.…”

Section: Methodsmentioning

confidence: 99%

“…Bottles were incubated in the dark at 30°C with gentle shaking (100 rpm) and aerated with sterile, humidified air for 15 min every 2 days. Mineralization of the radiolabeled substrates was monitored at each aeration by trapping the evolved [ 14C]carbon dioxide in a series of two scintillation vials containing liquid scintillation medium (Benner et al 1984a); traps were changed after each aeration and radioactivity was measured in a Beckman LS 9000 liquid scintillation spectrometer. All incubations were done with four replicates.…”

Section: Methodsmentioning

confidence: 99%

“…The total percentage of lignocellulose that was microbially mineralized during a given incubation period was calculated from the percentages of the lignin and polysaccharide components mineralized and the initial concentrations in each lignocellulose; lignocellulose preparations from S. alterniflora and C. walteriana are 80.0 and 85.5% polysaccharide and 20.0 and 14.4% lignin (Benner et al 1985). Lignocellulose preparations from R. mangle leaves and T. ascendens wood are 6 5.7 and 63 .O% polysaccharide and 34.3 and 37 .O% lignin.…”

Section: Methodsmentioning

confidence: 99%

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Biogeochemical cycling of lignocellulosic carbon in marine and freshwater ecosystems: Relative contributions of procaryotes and eucaryotes1

Benner

Moran

Hodson

1986

Limnology & Oceanography

181

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The relative contributions of procaryotes and eucaryotes to the degradation of the lignin and polysaccharide components of lignocellulosic detritus in two marine and two freshwater wetland ecosystems were determined. Two independent methods-physical separation of bacteria from fungi and other eucaryotes by size fractionation, and antibiotic treatments-were used to estimate procaryotic and eucaryotic contributions to the degradation of [14C-lignin]lignocelluloses and [14C-polysaccharidellignocelluloses in samples of water and decaying plant material from each environment. Both methods yielded similar results; bacteria were the predominant degraders of lignocellulose in each of the aquatic ecosystems. Fungi and other eucaryotes contributed only minimally to the overall degradation of lignocellulose in both marine ecosystems and in the Okefenokee Swamp but did contribute significantly to the degradation of lignocellulose in the Big Cypress Swamp. These results indicate a basic difference between the microbial degradation of Iignocellulosic material in terrestrial and aquatic environments. Fungi have long been considered the predominant degraders of lignocellulose in terrestrial systems; our results indicate that in aquatic systems bacteria are the predominant degraders of lignocellulose.

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Section: Discussionsupporting

confidence: 71%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Biogeochemical cycling of lignocellulosic carbon in marine and freshwater ecosystems: Relative contributions of procaryotes and eucaryotes1

Benner

Moran

Hodson

1986

Limnology & Oceanography

181

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Functional effects of subsidies and stressors on benthic microbial communities along freshwater to marine gradients

Anderson,

Kominoski,

Choi

et al. 2024

Ecology

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Leaf litter in coastal wetlands lays the foundation for carbon storage, and the creation of coastal wetland soils. As climate change alters the biogeochemical conditions and macrophyte composition of coastal wetlands, a better understanding of the interactions between microbial communities, changing chemistry, and leaf litter is required to understand the dynamics of coastal litter breakdown in changing wetlands. Coastal wetlands are dynamic systems with shifting biogeochemical conditions, with both tidal and seasonal redox fluctuations, and marine subsidies to inland habitats. Here, we investigated gene expression associated with various microbial redox pathways to understand how changing conditions are affecting the benthic microbial communities responsible for litter breakdown in coastal wetlands. We performed a reciprocal transplant of leaf litter from four distinct plant species along freshwater‐to‐marine gradients in the Florida Coastal Everglades, tracking changes in environmental and litter biogeochemistry, as well as benthic microbial gene expression associated with varying redox conditions, carbon degradation, and phosphorus acquisition. Early litter breakdown varied primarily by species, with highest breakdown in coastal species, regardless of the site they were at during breakdown, while microbial gene expression showed a strong seasonal relationship between sulfate cycling and salinity, and was not correlated with breakdown rates. The effect of salinity is likely a combination of direct effects, and indirect effects from associated marine subsidies. We found a positive correlation between sulfate uptake and salinity during January with higher freshwater inputs to coastal areas. However, we found a peak of dissimilatory sulfate reduction at intermediate salinity during April when freshwater inputs to coastal sites are lower. The combination of these two results suggests that sulfate acquisition is limiting to microbes when freshwater inputs are high, but that when marine influence increases and sulfate becomes more available, dissimilatory sulfate reduction becomes a key microbial process. As marine influence in coastal wetlands increases with climate change, our study suggests that sulfate dynamics will become increasingly important to microbial communities colonizing decomposing leaf litter.

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

Dittmar

Lara

2001

Estuarine, Coastal and Shelf Science

198

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Microbial degradation of the leachable and lignocellulosic components of leaves and wood from Rhizophora mangle in a tropical mangrove swamp

Cited by 129 publications

References 17 publications

Biogeochemical cycling of lignocellulosic carbon in marine and freshwater ecosystems: Relative contributions of procaryotes and eucaryotes1

Biogeochemical cycling of lignocellulosic carbon in marine and freshwater ecosystems: Relative contributions of procaryotes and eucaryotes1

Functional effects of subsidies and stressors on benthic microbial communities along freshwater to marine gradients

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

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