English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The relationship between benthic bacterial production and biomass and sediment-water exchange rates of inorganic nutrients was examined in the North Sea (Dogger Bank region), in summer. The sediments were sandy, poor in organic matter and with low buffering capacities for nutrients. Fluxes of dissolved inorganic N (DIN) and P (DIP) across the sediment-water interface were measured using undisturbed sediment cores. Bacterial production (3H-thymidlne incorporation method) in the sediment surface layer and bacterial biomass were analysed in the same sediment. By comparison of thc benthic actlvlties at 13 stations we assessed significant negative relations between bactenal production and sediment-water fluxes of nutrients W ~ t h ~ncreasing hdcterial production the net efflux of DIN and DIP decreased. Bacterial production was significantly related to bacterial biomass and bacterial biomass was significantly related to chlorophyll a and pheopigment in the sediment, suggesting that enhanced bacterial production rates were associated with input of organic carbon. The observed relationship between bacterial production and nutrient sediment-water exchange could be explained by temporary immobilization of N and P in bactenal biomass. It was demonstrated that in response to a short-term sedimentation event, the increase in benthic bacterial biomass (over a 5 d period) may equal the decrease in sediment-water effluxes of DIN and DIP. Heterotrophic benthic bacteria can apparently act as sinks for N and P, which only release N and P upon death.

Benthic bacterial production and nutrient sediment-water exchange in sandy North Sea sediments