Depth to the apparent redox potential discontinuity(aRPD)as a parameter of interest in marine benthic habitat quality models

作     者：Travis G.Gerwing Kieran Cox Alyssa M.Allen Gerwing Charmaine N.Carr-Harris Sarah E.Dudas Francis Juanes 

作者机构：Ecosystem Science and Management Program University of Northern British Columbia Department of Biology University of Victoria Skeena Fisheries Commission  4. Department of Biology Vancouver Island University 

出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))

年 卷 期：2018年第33卷第2期

页      面：149-156页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 07[理学] 0707[理学-海洋科学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0816[工学-测绘科学与技术] 

基　　金：funded by a MITACS Elevate postdoctoral fellowship(IT06069), to Travis Gerwing Natural Science and Engineering Research Council Discovery and Liber Ero Foundation Funds to Francis Juanes Canada Research Chair, Canadian Foundation for Innovation, and British Columbia Knowledge Development Fund grants to Sara Dudas 

主　　题：Anoxia Apparent redox potential discontinuity(aRPD) Dissolved oxygen Habitat quality Hypoxia Intertidal Marine benthos Sediment pore water 

摘      要：The usefulness of the apparent redox potential discontinuity(aRPD) in assessments of marine benthic habitat quality was explored at two intertidal mudflats along the north Pacific coast of Canada. Two transects were established at each intertidal site, with three sediment biogeochemistry cores collected from each transect four times over the summer of 2016. Measurements of the sediment pore water dissolved oxygen(DO) content and redox(Eh) conditions were taken at the surface of the core(measured vertically), as well as at increasing depths(1 cm between readings) into the sediment(measured horizontally through predrilled holes in the biogeochemistry corer). While oxic, anoxic, oxidized, and reduced sediment pore water was observed above and below the aRPD, in general, sediment above the aRPD had higher DO content, and higher Eh values than sediment below the aRPD. Therefore, the aRPD depth can be used as a relative indicator of sediment pore water DO and Eh conditions: sediment with a deeper aRPD depth has more available DO, and the pore water has higher Eh values(more oxidized or less reduced) than sediment with a shallower aRPD depth. As such, the aRPD depth is a useful parameter to include in models that assess the quality of marine benthic habitats.