Bacterial contribution to mitigation of iron and manganese in mangrove sediments

Krishnan, K. P.; Fernandes, Sheryl Oliveira; Chandan, G.S.; Bharathi, P. A. Loka

doi:10.1016/j.marpolbul.2007.05.023

Cited by 27 publications

(12 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…3a, b). In addition to the aerobic autotrophic nitrification process, recent studies have suggested the possibility of anaerobic autotrophic nitrification at the expense of electron acceptors such as Fe and/or Mn (Mortimer et al 2004;Krishnan et al 2007). Krishnan and Bharathi (2009) reported that the nitrification rate in mangrove sediments showed a positive relationship with Fe (contained in the sediment) and with the abundance of autotrophic nitrifiers.…”

Section: Oxidative Effectsmentioning

confidence: 99%

What happens to soil chemical properties after mangrove plants colonize?

Inoue

Nohara

Matsumoto³

et al. 2011

Plant Soil

View full text Add to dashboard Cite

Understanding soil chemical properties is necessary to characterize the basic properties of ecosystems. In mangrove ecosystems, soil iron, phosphorus, methane and nitrogen have been well studied under field conditions. However, it is difficult to understand fundamental relationships between mangrove root functions and soil chemical properties, because of the multiple factors present in field data. The aim of this study was to clarify what will happen to soil chemical properties after mangrove plant colonize. To examine the effect of mangrove roots on these soil properties, three representative mangrove species (Avicennia marina, Rhizophora stylosa and Bruguiera gymnorrhiza) were cultivated in a greenhouse and selected soil chemical properties were monitored in comparison with those in unplanted soil.We detected oxidative effects in all three species, including deposition of iron oxide on root surfaces, lowered methane concentrations and increased oxidized inorganic nitrogen concentrations in the soil pore-water, suggesting that radial oxygen loss from mangrove roots had affected these soil chemical properties. Besides the oxidative effects, enhanced Fe 2+ concentrations in the soil pore-water were present in A. marina, and enhanced phosphorus concentrations in the soil pore-water were present in all three species, suggesting that mangrove roots provide Fe-and phosphate-solubilizing substrates. The most remarkable change was in soil nitrogen enrichment. During the experimental period, amounts of nitrogen in the mangrove soils increased four times more than in uncolonized soil. Six months from the start of cultivation, bacterial nitrogen fixation (nitrogenase activity) was significantly higher in soil colonized by mangrove plants than in uncolonized soil, suggesting that mangrove roots stimulated bacterial nitrogen fixation. Among these properties, Phosphate mobilization and soil nitrogen enrichment are likely to be particularly important for the growth of mangrove plants, because phosphate and nitrogen are generally limited in mangrove ecosystems. This self-supporting ability of mangroves observed in this study could be one key to the high productivity of mangrove ecosystems.

show abstract

Section: Oxidative Effectsmentioning

confidence: 99%

What happens to soil chemical properties after mangrove plants colonize?

Inoue

Nohara

Matsumoto³

et al. 2011

Plant Soil

View full text Add to dashboard Cite

show abstract

“…The significant differences in bacterial diversity in sampling depths found in this study can be attributed to differences in oxygen availability, which seems to be selective for bacterial communities in terms of qualitative, quantitative, and functional composition. Due to frequent flooding of mangrove areas by sea water, the oxygen diffusion ratio in the sediment suffers a decrease of about 10,000 times, becoming lower than the value demanded for the oxidation of organic matter (Crump et al 2004;Silva et al 2006;Krishnan et al 2007). …”

Section: Assessment Of Bacterial Diversity By Dgge and The Correlatiomentioning

confidence: 99%

The bacterial diversity in a Brazilian non-disturbed mangrove sediment

Dias

Andreote

Rigonato

et al. 2010

Antonie van Leeuwenhoek

View full text Add to dashboard Cite

The bacterial diversity present in sediments of a well-preserved mangrove in Ilha do Cardoso, located in the extreme south of São Paulo State coastline, Brazil, was assessed using culture-independent molecular approaches (denaturing gradient gel electrophoresis (DGGE) and analysis of 166 sequences from a clone library). The data revealed a bacterial community dominated by Alphaproteobacteria (40.36% of clones), Gammaproteobacteria (19.28% of clones) and Acidobacteria (27.71% of clones), while minor components of the assemblage were affiliated to Betaproteobacteria, Deltaproteobacteria, Firmicutes, Actinobacteria and Bacteroidetes. The clustering and redundancy analysis (RDA) based on DGGE were used to determine factors that modulate the diversity of bacterial communities in mangroves, such as depth, seasonal fluctuations, and locations over a transect area from the sea to the land. Profiles of specific DGGE gels showed that both dominant ('universal' Bacteria and Alphaproteobacteria) and low-density bacterial communities (Betaproteobacteria and Actinobacteria) are responsive to shifts in environmental factors. The location within the mangrove was determinant for all fractions of the community studied, whereas season was significant for Bacteria, Alphaproteobacteria, and Betaproteobacteria and sample depth determined the diversity of Alphaproteobacteria and Actinobacteria.

show abstract

“…As a sequel to earlier findings1, we examined the down-core variation (at every 2 cm interval within 0–10 cm depth range) in nitrate reducing activity (NRA), dissimilatory nitrate reduction to ammonium (DNRA) and net nitrous oxide (N 2 O) production in two tropical mangrove systems of Goa, India. The Divar mangrove ecosystem which is influenced by NH 4 NO 3 input from ferromanganese mines located upstream6 was compared to Tuvem which is relatively pristine7. We hypothesize that mangroves are closed systems which efficiently conserve N through pathways like DNRA.…”

mentioning

confidence: 99%

Nitrogen-limited mangrove ecosystems conserve N through dissimilatory nitrate reduction to ammonium

Fernandes

Bonin

Michotey

et al. 2012

Sci Rep

Self Cite

104

View full text Add to dashboard Cite

Earlier observations in mangrove sediments of Goa, India have shown denitrification to be a major pathway for N loss1. However, percentage of total nitrate transformed through complete denitrification accounted for <0–72% of the pore water nitrate reduced. Here, we show that up to 99% of nitrate removal in mangrove sediments is routed through dissimilatory nitrate reduction to ammonium (DNRA). The DNRA process was 2x higher at the relatively pristine site Tuvem compared to the anthropogenically-influenced Divar mangrove ecosystem. In systems receiving low extraneous nutrient inputs, this mechanism effectively conserves and re-circulates N minimizing nutrient loss that would otherwise occur through denitrification. In a global context, the occurrence of DNRA in mangroves has important implications for maintaining N levels and sustaining ecosystem productivity. For the first time, this study also highlights the significance of DNRA in buffering the climate by modulating the production of the greenhouse gas nitrous oxide.

show abstract

Bacterial contribution to mitigation of iron and manganese in mangrove sediments

Cited by 27 publications

References 16 publications

What happens to soil chemical properties after mangrove plants colonize?

What happens to soil chemical properties after mangrove plants colonize?

The bacterial diversity in a Brazilian non-disturbed mangrove sediment

Nitrogen-limited mangrove ecosystems conserve N through dissimilatory nitrate reduction to ammonium

Contact Info

Product

Resources

About