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| 1 | Apparent redox potential discontinuity(aRPD) depth as a relative measure of sediment oxygen content and habitat quality显示文摘As hypoxic conditions spread in our oceans,indices that quickly and efficiently assess oxygen content in sediment pore water,and habitat quality are increasingly becoming desirable.Depth to the apparent redox potential discontinuity(aRPD) in sediment is one such index;however,the relationship between aRPD depth and oxygen content is still unclear.We quantified oxygen content in sediment pore water with a dissolved oxygen(DO) probe,utilizing luminescent technology,to determine how DO concentration varies with depth in the sediment,and with position relative to the aRPD(above versus below) on an intertidal mudflat in the Bay of Fundy,Canada.Based on generalized linear regression models,we found that depth in the sediment was a poor predictor of pore water DO concentration,while position in the sediment relative to the aRPD was a good predictor.Further,sediment above the aRPD had higher DO content than sediment below.We maintain that aRPD depth is a good measure of relative oxygen content in sediment pore water,as well as habitat quality.However,we recommend caution as the factors that influence aRPD depth arc numerous and variable;therefore,the relationship between aRPD depth and DO content should be experimentally confirmed in any system of interest before aRPD depth is used as an indicator. | Travis G.GERWING Alyssa M.ALLEN GERWING Diana J.HAMILTON Myriam A.BARBEAU | 2015 | International Journal of Sediment Research2015，30，1： | 3 |
| 2 | Depth to the apparent redox potential discontinuity(aRPD)as a parameter of interest in marine benthic habitat quality models显示文摘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. | Travis G.Gerwing Kieran Cox Alyssa M.Allen Gerwing Charmaine N.Carr-Harris Sarah E.Dudas Francis Juanes | 2018 | International Journal of Sediment Research2018，33，2： | 1 |
| 3 | Relationship between apparent redox potential discontinuity(aRPD)depth and environmental variables in soft-sediment habitats显示文摘As global temperatures increase and dissolved oxygen(DO) content decreases in marine systems, indices assessing sediment DO content in benthic habitats are becoming increasingly useful. One such measure is the depth to the apparent redox potential discontinuity(aRPD), a transition of sediment color that serves as a relative measure of sediment DO content. We examined spatiotemporal variation of aRPD depth, and the nature of the relationships between aRPD depth and biotic(infauna and epibenthic predators) and abiotic variables(sediment properties), as well as the availability of resources(chlorophyll a concentration, and organic matter content) in the intertidal mudflats of the Bay of Fundy, Canada. aRPD depth varied significantly through space and time, and a combination of biotic(sessile and errant infauna, as well as epibenthic predators), and abiotic(exposure time of a plot, sediment particle size,penetrability, and water content) variables, as well as the availability of resources(sediment organic matter content, and chlorophyll a concentration) were correlated with aRPD depth. As such, knowledge of both biotic and abiotic variables are required for a holistic understanding of sediment DO conditions.Abiotic variables likely dictate a suite of potential aRPD depth conditions, while biota and resource availability, via bioturbation and respiration, strongly influence the observed aRPD depth. As DO conditions in marine systems will continue to change due to global climate change, elucidating these relationships are a key first step in predicting the influence decreasing DO content may have upon marine benthos. | Travis G.Gerwing Alyssa M.Allen Gerwing Kieran Cox Francis Juanes Sarah E.Dudas | 2017 | International Journal of Sediment Research2017，32，4： | 0 |
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