engleski

Seasonal distribution of the ciliated protozoa in Kaštela Bay

Seasonal distribution of the ciliated protozoa was studied in the west part of Kaštela Bay during 1995. These are the first data of the annual distribution of four size categories of non-loricate ciliates and tintinnines in the coastal area of the central Adriatic Sea. The maximum densities of ciliated protozoa were recorded during the spring and autumn, when they could act as important factors of ‘top-down’ control. Contributions of non-loricate ciliates and tintinnines to the total of ciliated protozoa were 72% and 28%, respectively. The highest density of non-loricate ciliates were registered at the surface in September (1400 ind.l-1). Annual variability of the non-loricates density was mostly influenced by changes in numbers of the second (103–104 mm3) and the third (104–105 mm3) size categories and they constituted 86% of the total non-loricates counts. Non-loricates with biovolume smaller than 103 mm3 were the most abundant during the colder part of the year while those with biovolume larger than 105 mm3 dominated during the summer. The highest density of tintinnines (718 ind.l-1) was recorded at 5 m depth in May. Quantitatively, the most important tintinnin species was Helicostomella subulata. The results suggest to complex influence of biotic and abiotic factors on the annual distribution of ciliated protozoa.

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