Marine diatoms as indicators of modern changes in oceanographic conditions

Oscar E. Romero, Leanne K. Armand

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

36 Citations (Scopus)

Abstract

Marine diatoms as indicators of modern environment change A substantial part of the ocean’s primary productivity is provided by diatoms (Tréguer et al., 1995). In general, they are the dominant primary producers in temperate and cold areas, and are very abundant in the recently upwelled waters of Eastern Boundary Currents and in diverging surface currents where nutrients are brought to the surface (Nelson et al., 1995, and references therein). On an annual basis, the relative contribution of diatoms to primary productivity is highly variable: Nelson et al. (1995) and Tréguer et al. (1995) proposed upper limits of 35% in oligotrophic areas and up to 75% in coastal upwelling areas and other nutrient-rich systems. Regardless of the area, the general trend is for an increase in the relative abundance of diatoms in the phytoplankton together with primary productivity (Ragueneau et al., 2000). As a general statement we may say that diatoms are the dominant primary producers in a number of oceanographic settings that offer both the required high-nutrient and turbulence conditions (e.g. coastal upwelling areas, equatorial divergences, ice-edges, river plumes; Ragueneau et al., 2000). In contrast, small, non-siliceous pico- and nanoplankton are of great importance to total productivity in oligotrophic regions (Tréguer et al., 1995, and references therein).

Original languageEnglish
Title of host publicationThe Diatoms
Subtitle of host publicationApplications for the Environmental and Earth Sciences, Second Edition
EditorsJohn P. Smol, Eugene F. Stoermer
Place of PublicationCambridge
PublisherCambridge University Press
Pages373-400
Number of pages28
Edition2nd
ISBN (Electronic)9780511763175
ISBN (Print)9780521509961
DOIs
Publication statusPublished - 1 Jan 2010

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