Temperature and light affect asexual reproduction in brown algae Fucus radicans
(English)Manuscript (preprint) (Other academic)
Fucus radicans is a habitat forming brown macroalgae that utilizes asexual reproduction to complement its sexual reproduction. While asexual reproduction by adventitious branches (hereafter fragments) is common in F. radicans, the mechanisms behind it remain unknown. We conducted an experiment to study if water temperature and light intensity together with day length affect the re-attachment success of F. radicans fragments by using the light and temperature average conditions of the four seasons. Fragments were able to re-attach in all tested conditions. The fragments attached mostly by rhizoids but an alternative form of attachment was also observed, where an opaque substance cemented the fragment to the substrate. Temperature and light had an interactive impact on re-attachment, and re-attachment was highest under conditions of combined high temperature and high light. Although re-attachment was observed in all different temperature and light treatments, our results suggest that re-attachment success is favoured during warm temperatures and light conditions, i.e. the summer period. Understanding the mechanisms of asexual reproduction in F. radicans is important in order to assess the future dispersal patterns of this endemic foundation species.
Baltic Sea, clonal, fragmentation, fucoid, re-attachment, rhizoid
Research subject Plant Ecology
IdentifiersURN: urn:nbn:se:su:diva-117582OAI: oai:DiVA.org:su-117582DiVA: diva2:813747