Colonies as dynamic systems: reconstructing the life-history of Cribrilina annulata (Bryozoa) on two algal substrates.

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Quantifying interconnected performances of the modules in a colonial organism (feeding, sexual reproduction, rejuvenation, dormancy) into an integral picture enables studying sexual dynamics and resource allocation at different levels – from module to population. Testing this approach on the common boreal-Arctic bryozoan Cribrilina annulata in the White Sea, we describe its life history, comparing colonies on two algal substrates with contrasting size and life span. Colonies living on kelps were much larger and had a higher proportion of dormant zooids, whereas the percentage of reproducing, feeding and rejuvenating zooids was higher in colonies on red algae (with the colonies also exhibiting longer reproductive period). Colony life span was dependent both on substrate type and on time of colony establishment, lasting from 4–5 to up to 17 months on kelps and 14–18 months on red algae. During the reproductive season (May-September) the C. annulata population consisted of colonies of three cohorts on both substrata: overwintered and two summer generations that behaved differently. Whereas overwintered and summer colonies established in June-early August produced larvae, most of the colonies established after midsummer were preparing for hibernation and postponed reproduction until next spring. Moreover, young reproducing colonies formed brooding hermaphrodite zooids of ordinary size, whereas overwintered colonies budded smaller-sized and dwarf hermaphrodites. Finally, overall zooidal performance in co-existing colonies of the overwintered and young generations was different on
kelps, but similar on red algae. Altogether our findings indicate that the life-histories of colonial epibionts are much more complex and evolutionarily flexible than generally acknowledged.
Original languageEnglish
Pages (from-to)1363-1377
Number of pages15
JournalJournal of the Marine Biological Association of the United Kingdom
Issue number6
Publication statusPublished - Sep 2019

Scopus subject areas

  • Aquatic Science

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