THE BIOLOGY OF ASCIDIA NIGRA (SAVIGNY). III. THE ANNUAL PATTERN OF COLONIZATION

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Abstract
1. Artificial panels were used to allow six populations of Ascidia nigra to develop and grow naturally. The six populations started life at two-month intervals over a period of a year. 2. With the exception of a population starting life in June, all populations had dense colonization in the first two months after immersion of the panels, but few new colonizers in subsequent months. 3. The paucity of new colonizers after initial colonization is due to competition from other sessile organisms, first for space and later for food. 4. In the months November to December there is a marked increase in the number of new colonizers, irrespective of the age of the population. This is due to a large increase in the number of larvae available for settlement.

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