Abstract
ABSTRACTThe settlement patterns of spores ofPolysiphonia lanosa(L.) Tandy onAscophyllum nodosum(L.) Le Jolis andFucus vesiculosusL. were studied using a flow tank. Settlement sites were defined as ‘sheltered’ or ‘exposed.’ Surface area calculations revealed non‐random settlement onA. nodosum, with higher than expected spore frequencies on the thallus and lateral pits and lower than expected frequencies on the vesicles. Settlement ofF. vesiculosuswas random and significantly lower than onA. nodosum.On the shore, survival of sporelings from September (post‐sporulation) to May (pre‐sporulation) was highly non‐random on both basiphytes. OnA. nodosum, lateral pits ('sheltered') showed the highest survival frequency. Here the proportion of surviving sporelings increased over the study period, whereas the proportion on open thallus area ('exposed') decreased. OnF. vesiculosusalso preferential survival occurred on ‘sheltered’ sites such as vesicle/thallus interfaces and wounds. Between September and May, allP. lanosasporelings were lost from ‘exposed’ areas (thallus surface and vesicles). Overall, frequencies of surviving sporelings were much greater onA. nodosumthan onF. vesiculosus.These results are discussed with reference to basiphyte morphology, epiphyte removal mechanisms and the survival stratagy ofP. lanosa.
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