Downwearing rates on shore platforms and rocky coast evolution- bioerosion contribute

(1) Marine and Environmental Research Centre-CIMA, University of Algarve Campus de Gambelas, 8005-139 Faro, Portugal (dmoura@ualg.pt / Fax: +351 289800069), (2) Geography Research Centre / IGOT University of Lisbon. Edificio FLUL, Alameda da Universidade, 1600-214 Lisboa, Portugal, (3) Institute of Marine Research. University of AlgarveCampus de Gambelas, 8005-139 Faro, Portugal, (4) Center of Marine Sciences of Algarve. University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal