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Abstract
Auxospores of Aulacoseira herzogii (Lemmermann) Simonsen were found in Lake Banani (Dhaka, Bangladesh) during the monsoon season in September 1992. In the following weeks, the lake became overgrown by a floating canopy of water hyacinth (Eichhornia crassipes) and die cell concentration of A. herzogii declined. During auxosporulation, diameter regeneration of A. herzogii cells was approximately three times, from 4.9 μm (mean of parent cells) to 15.1 μm (mean of initial cells). In this species, some morphological features, such as number of separation spines (1–8) and rimoportulae (up to 8), are size dependent. Other aspects of population size-structure, reproduction and ecology of this rarely reported species are presented.
