ibclogo XVI International Botanical Congess


Abstract Number: 5059
Poster No. = 1160


CALIBRATION OF EPIPHYTIC LICHENS AS SALTFALL BIOMONITORS


R. Figueira1,2, A. M. G. Pacheco1, A.J. Sousa1 and F. Catarino2, 1 CVRM-IST, 1049-001 Lisboa, Portugal, 2 MLJB, 1250-102 Lisboa, Portugal


Lichens have been searched for dose-response functions in stressed habitats probably far more often than any other group of plants but bryophytes, and yet there are no studies on elemental salt tracers and their correlation with the deposition of marine elements on a quantitative basis. This paper addresses the calibration of two lichens of the Ramalina and Usnea genera as saltfall biomonitors versus physical samplers, which lasted for several years. An exposure-effect model, derived from principal-component analysis of physical and biological data, and its statistical performance are presented and discussed. Model coefficients for each case were set and tuned up by multiple regression of lichen concentrations on elemental fluxes and on a customised measure of wet precipitation.O


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