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Impacts of water depth, sediment pigment concentration, and benthic macrofaunal biomass on sediment oxygen demand in the western Arctic Ocean

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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.

Nous avons étudié les impacts de la profondeur de l'eau, de la concentration des pigments dans les sédiments et de la biomasse de la macrofaune benthique sur la demande d'oxygène des sédiments (SOD) au cours de trois excursions dans l'ouest de l'océan Arctique. Les valeurs de SOD sont semblables à celles trouvées dans la plupart des études sur l'arctique et varient d'un maximum de 20,68 mmol O2·m–2·jour–1 à une station de plate-forme peu profonde à un minimum de 0,29 mmol O2·m–2·jour–1 à la station du bassin le plus profond (3648 m). La SOD est significativement plus élevée aux sites moins profonds (<500 m; moyenne = 7,39 mmol O2·m–2·jour–1; écart type, ET ± 5,38) qu'aux sites profonds (>500 m; moyenne = 1,39 mmol O2·m–2·jour–1, ET ± 0,96). Comme le veut notre hypothèse, il y a une corrélation négative entre SOD et la profondeur et une corrélation positive avec à la fois la concentration des pigments à la surface des sédiments et la biomasse de la macrofaune; la biomasse de la macrofaune explique d'ailleurs environ 74 % de la variabilité de SOD. Nous avançons que les taux plus élevés de respiration normalisés en fonction de la macrofaune (c.-à-d., SOD divisée par la biomasse de la macrofaune) en eau profonde indiquent que la respiration microbienne et celle de la méiofaune prédominent dans les eaux profondes en contraste avec les eaux moins profondes. Enfin, les stations plus profondes associées au canyon de Barrow ont des demandes en oxygène des sédiments, des biomasses de macrofaune benthique et des concentrations de pigments dans les sédiments de surface qui sont similaires à celles des plates-formes moins profondes, ce qui laisse croire à un transport de la matière organique du haut vers le bas dans le canyon.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2005-08-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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