Abstract
Planktonic populations and benthic resting stages (akinetes) of the common
bloom-forming cyanobacteria Anabaena circinalis
Rabenhorst and Anabaena flos-aquae f.
flos-aquae (Lyngb.) Komárek were monitored in the
Murray River near Nildottie and in adjacent floodplain wetlands (lagoons) from
1995 to 1997, to determine the extent of sporulation and the contribution of
recruitment from the sediments to seasonal development of blooms. Physical and
chemical characteristics of the water in the river and the lagoons were
examined in relation to the succession of key life-cycle stages and growth.
The warm, shallow lagoons supported considerably higher populations of
Anabaena in the summer than did the river, with
correspondingly higher incidence of sporulation. Viable akinetes were abundant
in the sediments of both the river channel and the lagoons, providing a
potentially significant inoculum for cyanobacterial growth. The apparent
germination of akinetes early in summer and immediately following sporulation
in mid summer indicated a strategy for both initiation and maintenance of
populations. A. circinalis also persisted as a
planktonic population throughout winter. Germination is considered more likely
to occur in the shallow lagoons than in the main channel, principally because
of frequent resuspension of sediments containing resting stages to the
euphotic zone or because of direct penetration of light to the sediments.
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
39 articles.
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