中文版 | English
Title

Effects of fiddler crab bioturbation on the geochemical migration and bioavailability of heavy metals in coastal wetlands

Author
Corresponding AuthorXiao,Kai
Publication Years
2022-09-05
DOI
Source Title
ISSN
0304-3894
EISSN
1873-3336
Volume437
Abstract
Fiddler crabs, found in coastal wetlands worldwide, function as ecosystem engineers. Their burrowing activity can significantly alter biogeochemistry at the local scale, however, the mobility of heavy metals (HMs) in burrow sediments remains unclear. Here, we used diffusive gradients in thin-film probes to obtain bioavailable Fe and HMs (Cu, Zn, Ni, Cd, Pb, Co, and Mo) in crab burrows from coastal wetlands (mudflats, salt marshes, and mangroves). The depth-profile results showed that most HMs were enriched at shallow and deep depths but deficient at middle depths. We highlighted that bioturbation improved oxic conditions, enhanced HM concentrations, and favored dissolved HM retention in burrow sediments, which served as a sink for overlying water HMs via burrow flushing but a potential source of particle HMs via enhanced resuspension. In deep anoxic layers, Fe(III) reduction drove the remobilization of HMs, except Cu and Mo, leading to the co-release of HMs with Fe. This Fe-HM coupling/decoupling was verified using enhanced two-dimensional high-resolution imaging, which revealed highly spatial heterogeneity of multiple HMs. Moreover, the hydrological conditions regulating bioturbation effects on HM behavior varied across different coastal wetlands. With coastal environmental changes, the key role of ubiquitous bioturbation in HM migration and bioavailability should be reconsidered.
Keywords
URL[Source Record]
Indexed By
SCI ; EI
Language
English
SUSTech Authorship
Corresponding
Funding Project
National Natural Science Foundation of China["42177046","42106038"]
WOS Research Area
Engineering ; Environmental Sciences & Ecology
WOS Subject
Engineering, Environmental ; Environmental Sciences
WOS Accession No
WOS:000833540400003
Publisher
EI Accession Number
20222612297701
EI Keywords
Biochemistry ; Iron compounds ; Sediments ; Wetlands
ESI Classification Code
Soil Mechanics and Foundations:483 ; Metallurgy and Metallography:531 ; Biochemistry:801.2
ESI Research Field
ENGINEERING
Scopus EID
2-s2.0-85132877189
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:7
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/352464
DepartmentSchool of Environmental Science and Engineering
Affiliation
1.College of Ocean and Earth Sciences,Xiamen University,Xiamen,361102,China
2.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
Corresponding Author AffilicationSchool of Environmental Science and Engineering
Recommended Citation
GB/T 7714
Pan,Feng,Xiao,Kai,Guo,Zhanrong,et al. Effects of fiddler crab bioturbation on the geochemical migration and bioavailability of heavy metals in coastal wetlands[J]. JOURNAL OF HAZARDOUS MATERIALS,2022,437.
APA
Pan,Feng,Xiao,Kai,Guo,Zhanrong,&Li,Hailong.(2022).Effects of fiddler crab bioturbation on the geochemical migration and bioavailability of heavy metals in coastal wetlands.JOURNAL OF HAZARDOUS MATERIALS,437.
MLA
Pan,Feng,et al."Effects of fiddler crab bioturbation on the geochemical migration and bioavailability of heavy metals in coastal wetlands".JOURNAL OF HAZARDOUS MATERIALS 437(2022).
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