Seasonal dynamics of the diversity and abundance of the marine interstitial testate amoebae (Rhizopoda : Testacealobosia and Testaceafilosia) in the black sea supralittoral

摘要

The seasonal dynamics of diversity, abundance and horizontal distribution of the psammobiotic testaceans in four selected sandy beaches from the Bulgarian Black Sea Coast have been studied. A total of 2774 specimens of thirty-three psammobiotic species from 19 genera were observed. Pseudocorythion wailesi and Corythionella minima showed the highest relative abundance (20% and 17% of the established specimens, respectively). The genera Psammonobiotus (5 species), Centropyxiella (4), Corythionella (3) and Ogdeniella (3) had the biggest diversity. The data on seasonal dynamics of the diversity and abundance of the interstitial testacean communities showed that there were a well-expressed maximum of these parameters in the summer (from 10 to 21 species and an average abundance about of 70-175 specimenS/CM3) and a minimum in the autumn-winter period (2-12 species and about of 3-60 specimenS/CM3). Further situated zones away of the marine waterline (6 m and 9 m) are more favorable for the development and surviving of the strict psammobionts. These zones have richer and more abundant interstitial testacean fauna (32 species and maximum abundance of 242 specimenS/CM3) than those situated at 3 m (14 species and maximum abundance of 166 specimens/cM3).