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Chen, Ronghua; Twilley, Robert R.

doi:10.1023/a:1006076405557

Cited by 6 publications

(1 citation statement)

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“…Although, some studies have reported that seaward distance has more effect on soil organic carbon (SOC) than AGB (de Jong Cleyndert et al, 2020). Tidal flooding which maybe as a result of heavy rainfall may contribute to the phosphorus balance of mangrove forests (Chen and Twilley, 1999). Our study showed that AGB were lower at plots closer to settlements, which could be as a result of either nutrient modification, pollution, or a consequence of perturbation through logging and fishing.…”

Section: Aboveground Biomass and Leaf Area Index Patterns In The Niger Deltamentioning

confidence: 51%

Natural and Anthropogenic Variation of Stand Structure and Aboveground Biomass in Niger Delta Mangrove Forests

Nwobi

Williams

2021

Front. For. Glob. Change

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Mangrove forests are important coastal wetlands because of the ecosystem services they provide especially their carbon potential. Mangrove forests productivity in the Niger Delta are poorly quantified and at risk of loss from oil pollution, deforestation, and invasive species. Here, we report the most extensive stem girth survey yet of mangrove plots for stand and canopy structure in the Niger Delta, across tidal and disturbance gradients. We established twenty-five geo-referenced 0.25-ha plots across two estuarine basins. We estimated aboveground biomass (AGB) from established allometric equations based on stem surveys. Leaf area index (LAI) was recorded using hemispherical photos. We estimated a mean AGB of 83.7 Mg ha–1 with an order of magnitude range, from 11 to 241 Mg ha–1. We found significantly higher plot biomass in close proximity to a protected site and tidal channels, and the lowest in the sites where urbanization and wood exploitation was actively taking place. The mean LAI was 1.45 and ranged fivefold from 0.46 to 2.41 and there was a significant positive correlation between AGB and LAI (R2 = 0.31). We divided the plots into two disturbance regimes and three nipa palm (Nypa fruticans) invasion levels. Lower stem diameter (5–15 cm) accounted for 70% of the total biomass in disturbed plots, while undisturbed regimes had a more even (∼25%) contribution of different diameter at breast height (DBH) size classes to AGB. Nipa palm invasion also showed a significant link to larger variations in LAI and the proportion of basal area removed from plots. We conclude that mangrove forest degradation and exploitation is removing larger stems (>15 cm DBH), preferentially from these mangroves forests and creates an avenue for nipa palm colonization. This research identifies opportunities to manage the utilization of mangrove resources and reduce any negative impact. Our data can be used with remote sensing to estimate biomass in the Niger Delta and the inclusion of soil, leaf properties and demographic rates can analyze mangrove-nipa competition in the region.

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Section: Aboveground Biomass and Leaf Area Index Patterns In The Niger Deltamentioning

confidence: 51%

Natural and Anthropogenic Variation of Stand Structure and Aboveground Biomass in Niger Delta Mangrove Forests

Nwobi

Williams

2021

Front. For. Glob. Change

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Isolation and identification of lactic acid bacteria from sediments of a coastal marsh using a differential selective medium

Zamudio-Maya

Narváez-Zapata

Rojas-Herrera

2008

Lett Appl Microbiol

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Aims: To identify lactic acid bacteria (LAB) colonies isolated from sediments of a coastal marsh by the reduction of 2,3,5‐triphenyltetrazolium chloride (TTC) in MRS medium. Methods and Results: Single colonies isolated from sediments of a coastal marsh by enrichment in MRS broth were selected from MRS‐TTC plates and classified according to colony phenotype based on TTC reduction. A total of 37 colonies grouped in seven different phenotypes were identified by analysis of its 16S ribosomal gene sequence. Most isolates belonged to the Firmicutes phylum, mainly to orders Bacillales and Lactobacillales. LAB were represented by 20 isolates, 15 of which belong to the genus Weissella. Conclusions: Enrichment in MRS was highly selective for the isolation of bacteria belonging to phylum Firmicutes. Several different phenotypes were developed by LAB and must be considered during LAB isolation based on TTC reduction. Significance and Impact of the Study: To our knowledge, this is the first study aimed at determining a relationship between colony phenotype from TTC reduction and a partial identification of isolates based on 16S ribosomal gene sequence similarities. Besides, this is the first report of isolation of W. cibaria from environmental samples.

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Organic Matter Dynamics on the Forest Floor of a Micronesian Mangrove Forest: An Investigation of Species Composition Shifts¹

Gleason

Ewel

2002

Biotropica

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Species composition shifts in mangrove forests may alter organic matter dynamics. The purpose of this study was to predict the effect of species replacements among mangrove trees on organic matter dynamics in a mangrove forest on the island of Kosrae, Federated States of Micronesia. We were particularly interested in elements of the carbon cycle that affect peat accumulation rates, organic matter exports to the estuary and coral reef systems, and soil microbiology. We compared organic matter production and decomposition rates among three mangrove species that commonly grow in similar hydrogeomorphic settings: Rhizophora apiculata BL, which is selectively harvested; Bruguiera gymnorrhiza, which may gradually replace Rhizophora; and Sonneratia alba, which is producing few mature fruits. Sonneratia had significantly higher rates of root production (estimated with ingrowth chambers) than Bruguiera or Rhizophora. Sonneratia foliage had significantly faster decomposition rates and significantly lower lignin:nitrogen ratios than Bruguiera foliage. Live root mass was positively correlated with ingrowth and soil carbon, although soil carbon and ingrowth were not significantly correlated with each other. Humic acid concentrations were significantly higher in Sonneratia rhizospheres than in either Bruguiera or Rhizophora rhizospheres and were positively correlated with root ingrowth. The species changes taking place on Kosrae are likely to result in lower rates of root production and foliage decomposition, and more refractory carbon pools in soil.

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Cited by 6 publications

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Natural and Anthropogenic Variation of Stand Structure and Aboveground Biomass in Niger Delta Mangrove Forests

Natural and Anthropogenic Variation of Stand Structure and Aboveground Biomass in Niger Delta Mangrove Forests

Isolation and identification of lactic acid bacteria from sediments of a coastal marsh using a differential selective medium

Organic Matter Dynamics on the Forest Floor of a Micronesian Mangrove Forest: An Investigation of Species Composition Shifts¹

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Cited by 6 publications

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Natural and Anthropogenic Variation of Stand Structure and Aboveground Biomass in Niger Delta Mangrove Forests

Natural and Anthropogenic Variation of Stand Structure and Aboveground Biomass in Niger Delta Mangrove Forests

Isolation and identification of lactic acid bacteria from sediments of a coastal marsh using a differential selective medium

Organic Matter Dynamics on the Forest Floor of a Micronesian Mangrove Forest: An Investigation of Species Composition Shifts1

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Organic Matter Dynamics on the Forest Floor of a Micronesian Mangrove Forest: An Investigation of Species Composition Shifts¹