In:
Marine and Freshwater Research, CSIRO Publishing, Vol. 52, No. 4 ( 2001), p. 451-
Abstract:
During a large-scale ecosystem study on the south-east Australian shelf in
spring 1994, we opportunistically sampled a widespread phytoplankton bloom. Thalassiosira partheneia, a small centric diatom, was
the primary species in the bloom, indicating that we had sampled the early stage of a typical short-lived spring bloom for the area. Pigment analysis
indicated four distinct communities that were coincident with the regional oceanography. The bloom was strongest over the northern shelf where the East
Australian Current overlaid uplifted nutrient-rich slope water, but absent at inner stations on the wide southern shelf, where slope water did not reach.
The bloom was patchy over the southern outer shelf where slope water was present to the surface and local conditions were influenced by topography.
Pigment and stable isotope data indicated that primary production in this area was almost entirely oceanic. A slight trend for seaward enrichment of sediment
δ13C is best explained by limited macroalgal growth in shallow waters. There was little fresh organic matter in the
sediment even for stations under the bloom, suggesting that the bloom did not reach the seabed directly. The lack of specific zooplankton grazing pigments
suggests that zooplankton grazing was minimal.
Type of Medium:
Online Resource
ISSN:
1323-1650
Language:
English
Publisher:
CSIRO Publishing
Publication Date:
2001
detail.hit.zdb_id:
1283028-8
SSG:
12
SSG:
21,3
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