Effect of Crab Burrows on CO₂ Flux from the Sediment Surface to the Atmosphere in a Subtropical Mangrove Forest on Ishigaki Island, Southwestern Japan

To clarify the effects of crab burrows on variation in sediment CO₂ flux in mangrove forest, we measured the traits of crab burrows (density and entrance area size) and the CO₂ flux rate from sediment surfaces, in areas with and without burrows, in a subtropical mangrove forest on Ishigaki Island, s...

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Veröffentlicht in:Estuaries and coasts 2020-01, Vol.43 (1), p.102-110
Hauptverfasser: Tomotsune, Mitsutoshi, Arai, Hideshi, Yoshitake, Shinpei, Kida, Morimaru, Fujitake, Nobuhide, Kinjo, Kazutoshi, Ohtsuka, Toshiyuki
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container_issue 1
container_start_page 102
container_title Estuaries and coasts
container_volume 43
creator Tomotsune, Mitsutoshi
Arai, Hideshi
Yoshitake, Shinpei
Kida, Morimaru
Fujitake, Nobuhide
Kinjo, Kazutoshi
Ohtsuka, Toshiyuki
description To clarify the effects of crab burrows on variation in sediment CO₂ flux in mangrove forest, we measured the traits of crab burrows (density and entrance area size) and the CO₂ flux rate from sediment surfaces, in areas with and without burrows, in a subtropical mangrove forest on Ishigaki Island, southwestern Japan. Burrow density and entrance area showed significant differences among seasons (warm, middle, and cool) and mangrove zones (upper-, middle-, and downstream), which may have depended on crab phenology, life cycle, and species composition. The sediment CO₂ flux rate was significantly higher at plots with crab burrows (B+) than at those without burrows (B-) in each zone and season. However, standardized sediment CO₂ flux rate by burrow surface area at B+ plots did not differ significantly from that at B- plots. In addition, there were no significant differences in sediment temperature and sediment water content between the two types of plots. Moreover, the level of microbial respiration differed significantly between sediments collected from the deep part and those collected from either the ground surface part or burrow walls. These results suggest that crab burrows increase sediment CO₂ flux from the mangrove forest floor by increasing the sediment–atmosphere interface area, thereby inducing a change to aerobic conditions in the sediments around burrows. Therefore, the seasonal and spatial effect of crab burrows on the forest floor should be considered when evaluating sediment CO₂ flux and examining the role of the mangrove ecosystem as a carbon sink.
doi_str_mv 10.1007/s12237-019-00667-2
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Burrow density and entrance area showed significant differences among seasons (warm, middle, and cool) and mangrove zones (upper-, middle-, and downstream), which may have depended on crab phenology, life cycle, and species composition. The sediment CO₂ flux rate was significantly higher at plots with crab burrows (B+) than at those without burrows (B-) in each zone and season. However, standardized sediment CO₂ flux rate by burrow surface area at B+ plots did not differ significantly from that at B- plots. In addition, there were no significant differences in sediment temperature and sediment water content between the two types of plots. Moreover, the level of microbial respiration differed significantly between sediments collected from the deep part and those collected from either the ground surface part or burrow walls. These results suggest that crab burrows increase sediment CO₂ flux from the mangrove forest floor by increasing the sediment–atmosphere interface area, thereby inducing a change to aerobic conditions in the sediments around burrows. Therefore, the seasonal and spatial effect of crab burrows on the forest floor should be considered when evaluating sediment CO₂ flux and examining the role of the mangrove ecosystem as a carbon sink.</abstract><cop>New York</cop><pub>Springer Science + Business Media</pub><doi>10.1007/s12237-019-00667-2</doi><tpages>9</tpages></addata></record>
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subjects Aerobic conditions
Area
Atmosphere
Burrowing organisms
Burrows
Carbon dioxide
Carbon sinks
Coastal Sciences
Density
Earth and Environmental Science
Ecology
Environment
Environmental Management
Floors
Fluctuations
Flux
Forest floor
Freshwater & Marine Ecology
Life cycle
Life cycles
Mangrove swamps
Mangroves
Marine crustaceans
Microorganisms
Moisture content
ORIGINAL PAPERS
Oxic conditions
Seasons
Sediment
Sediment temperature
Sediments
Species composition
Water and Health
Water content
Zoobenthos
title Effect of Crab Burrows on CO₂ Flux from the Sediment Surface to the Atmosphere in a Subtropical Mangrove Forest on Ishigaki Island, Southwestern Japan
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