On estimating the duration of phenological stages in bryophytes
Rob van der ValkR. van der Valk (email@example.com), J. Buiskoolweg 10 A, NL-9695 TT Bellingwolde, the Netherlands.
Estimating the duration of stages in the life cycle of bryophytes based on repeated censuses of populations is a non-
trivial task. A method to estimate the length of the period of primary moult in birds is shown here to be also ap
plicable for mosses, using the stage between the events of loss of the calyptra and operculum loss as an example. The
duration of this ‘operculum’ stage varied considerably among nine Dutch moss species studied. The species formed
three clusters, with average duration of this stage of 8, 23 and 101 days.