Variation of sediment properties among the radial profiles of fiddler crab burrows in mangrove ecosystem

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Abstract

Fiddler crabs burrow creates oxic-anoxic interfaces on the burrow walls. Accordingly burrow walls represent the transitions site between oxic and anoxic condition where the sediment properties varied significantly across it. In this study the burrows of three species of fiddler crabs including Uca rosea, Uca forcipata and Uca pardussumieri were sampled at three depth layers. Sediment properties of burrow walls including; temperature, redox potential, pH, density, porosity, water content, organic content, chlorophyll content and solid phase iron pools were measured to determine the magnitude of burrow effects on mangrove sediments. The results indicated that U. paradussumieri effectively reduced the sediment porosity of surrounding sediments down to 45%. Oxidized layer was more extended around U. paradussumieri burrows. Burrow walls of U. forcipata and U. paradussumieri contain higher water content than ambient sediment and burrows of U. rosea efficiently decreased the organic content of sediment. The PCA biplots indicated that the burrow walls of the all three species of fiddler crabs at 3 and 8 cm depth were correlated with oxidized iron. Ambient sediments of U. forcipata habitat were correlated with reduced iron and organic content. At 20 cm depth, burrow walls of U. paradussumieri were highly correlated with water content, while ambient sediment was correlated with reduced iron. The results of this study revealed that the thickness of oxidized layer varied according to sediment depth and burrow volume. Consequently the burrow effect varied significantly among different species of fiddler crabs as results of different habitat characteristics, sediment types and crab size.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalInternational Journal of Zoological Research
Volume12
Issue number1-2
DOIs
Publication statusPublished - 2016

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burrows
crabs
sediments
ecosystems
iron
water content
porosity
redox potential
habitats
anaerobic conditions
chlorophyll

Keywords

  • Bioturbation
  • Burrow walls
  • Mangrove sediment
  • Oxidation effect
  • Principal component analysis

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

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title = "Variation of sediment properties among the radial profiles of fiddler crab burrows in mangrove ecosystem",
abstract = "Fiddler crabs burrow creates oxic-anoxic interfaces on the burrow walls. Accordingly burrow walls represent the transitions site between oxic and anoxic condition where the sediment properties varied significantly across it. In this study the burrows of three species of fiddler crabs including Uca rosea, Uca forcipata and Uca pardussumieri were sampled at three depth layers. Sediment properties of burrow walls including; temperature, redox potential, pH, density, porosity, water content, organic content, chlorophyll content and solid phase iron pools were measured to determine the magnitude of burrow effects on mangrove sediments. The results indicated that U. paradussumieri effectively reduced the sediment porosity of surrounding sediments down to 45{\%}. Oxidized layer was more extended around U. paradussumieri burrows. Burrow walls of U. forcipata and U. paradussumieri contain higher water content than ambient sediment and burrows of U. rosea efficiently decreased the organic content of sediment. The PCA biplots indicated that the burrow walls of the all three species of fiddler crabs at 3 and 8 cm depth were correlated with oxidized iron. Ambient sediments of U. forcipata habitat were correlated with reduced iron and organic content. At 20 cm depth, burrow walls of U. paradussumieri were highly correlated with water content, while ambient sediment was correlated with reduced iron. The results of this study revealed that the thickness of oxidized layer varied according to sediment depth and burrow volume. Consequently the burrow effect varied significantly among different species of fiddler crabs as results of different habitat characteristics, sediment types and crab size.",
keywords = "Bioturbation, Burrow walls, Mangrove sediment, Oxidation effect, Principal component analysis",
author = "Mohammad Mokhtari and {Abd. Ghaffar}, Mazlan and Gires Usup and {Che Cob}, Zaidi",
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AU - Mokhtari, Mohammad

AU - Abd. Ghaffar, Mazlan

AU - Usup, Gires

AU - Che Cob, Zaidi

PY - 2016

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