β Scribed by Antonia Cattaneo; Sergio Ghittori; Valerio Vendegna
No coin nor oath required. For personal study only.
Changes in the taxonomic composition, chlorophyll a concentration, dry weight, percentage organic carbon and nitrogen and several indices of diversity, including "Margalef's index" were followed during the development of phytobenthonic communities on glass slides. These data suggest that, in this environment, the algal community resembles the nearby natural community after 4 weeks. The taxonomic development can be divided into two phases. During the first 2 weeks the phytocoenosis is dominated by a rather diverse and variable diatom assemblage. Later Cyanophyta dominate. The diversity decreases during colonization as reflected by all indices considered.
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The development of the periphytic algae and macrofauna was examined in two fish ponds. 43 genera of algae (mainly diatoms) were found on the substrates, and the maximum of algae was reached on the 10th day. The periphytic macrofauna consisted of 37 taxonomical groups (mainly Chironomidae). Larvae of