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- Title
Impacts of water depth, sediment pigment concentration, and benthic macrofaunal biomass on sediment oxygen demand in the western Arctic Ocean.
- Authors
Clough, Lisa M.; Renaud, Paul E.; Ambrose Jr., William G.
- Abstract
We investigated the impacts of water depth, sediment pigment concentration, and benthic macrofaunal biomass on sediment oxygen demand (SOD) during three cruises to the western Arctic Ocean. SOD values were similar to those of most studies from the Arctic and ranged from a high of 20.68 mmol O2·m–2·day–1 at a shallow shelf station to a low of 0.29 mmol O2·m–2·day–1 at the deepest basin station (3648 m). SOD was significantly greater at shallow sites (<500 m; mean = 7.39 mmol O2·m–2·day–1; standard deviation (SD) = ±5.38) than at deep sites (>500 m; mean = 1.39 mmol O2·m–2·day–1; SD = ±0.96). As hypothesized, SOD was negatively correlated with water depth and positively correlated with both surface-sediment pigment concentration and macrofaunal biomass, with macrofaunal biomass explaining approximately 74% of the variability in SOD. We propose that higher macrofauna-normalized respiration rates (i.e., SOD divided by macrofaunal biomass) in deep water indicate that microbial–meiofaunal respiration predominates in deep versus shallow water. Finally, deeper stations associated with Barrow Canyon had SODs, benthic macrofaunal biomass, and surface-sediment pigment concentrations that were similar to those of shallower shelf locations, suggesting down-canyon transport of organic material.
- Subjects
ARCTIC Ocean; FISHERIES; BIOMASS; BENTHIC animals; OXYGEN
- Publication
Canadian Journal of Fisheries & Aquatic Sciences, 2005, Vol 62, Issue 8, p1756
- ISSN
0706-652X
- Publication type
Article
- DOI
10.1139/F05-102