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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Two cruises (April and June 1997) were carried out in the Bay of Seine, a nitrate- and ammonium-enriched ecosystem of Western Europe, to identify the major mechanisms that control δ 15 N and δ 13 C in spring particulate organic matter (POM). Particulate organic nitrogen (PON) δ 15 N ranged between 0.8 and 5.2 ‰ in April and between 2.2 and 6.2 ‰ in June, while particulate organic carbon (POC) δ 13 C ranged between -24.3 and -19.7‰, and between -20.0 and -16.2‰ during the same periods. During spring 1997, POM was highly dominated by autochthonous phytoplankton. It is shown that the variation of PON δ 15 N is due to both nitrate mixing between river and marine waters and fractionation of N stable isotopes during nitrate utilization by phytoplankton. Therefore, similarly to what was previously shown for open ocean, δ 15 N can be used as a proxy of spring fractional nitrate utilization in coastal ecosystems. It is also shown that POC δ 13 C in spring is controlled by POC con- centration and C:N ratio (in addition to 'temperature effects'), which are considered here as indica- tors of primary production and phytoplankton degradation, respectively. The co-variation of δ 13 C and δ 15 N describes the spring phytoplankton dynamics: at the start of phytoplankton development, nitrate concentration is high (low δ 15 N) and phytoplankton production is low (low δ 13 C); then primary pro- duction increases (δ 13 C becomes higher) and the nitrate pool diminishes (δ 15 N becomes higher); at a later stage, the nitrate pool is depleted (high δ 15 N), part of the phytoplankton becomes degraded and production is still high (high δ 13 C).

Dynamics of particulate organic matter d15N and d13C during spring phytoplankton blooms in a macrotidal ecosystem (Bay of Seine, France)