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More specifically, we assessed the photochemical efficiency, Symbiodinium density and photosynthetic pigments profile of Zoanthus sociatus during low tide. Photochemical efficiency was lower and cell density higher in air exposed zoanthids. The profile of photosynthetic pigments also varied significantly among tidal habitats, particularly photoprotective pigments such as dinoxanthin and diadinoxanthin. Differences were also observed for the pigment content per cell, but the proportion of particular pigments (peridinin\/chlorophyll-a and diatoxanthin+diadinoxanthin\/chlorophyll-a) remained stable. Results suggest that aerial exposure conditions induce reversible downregulation of photochemical processes but no photophysiological impairment or bleaching. These findings provide a baseline for future studies addressing the prevalence of these overlooked cnidarians in environmentally dynamic reef flats.<\/jats:p>","DOI":"10.1071\/mf15300","type":"journal-article","created":{"date-parts":[[2015,12,9]],"date-time":"2015-12-09T22:07:04Z","timestamp":1449698824000},"page":"1991-1997","source":"Crossref","is-referenced-by-count":8,"title":["Photobiology of the zoanthid Zoanthus sociatus in intertidal and subtidal habitats"],"prefix":"10.1071","volume":"67","author":[{"given":"Miguel C.","family":"Leal","sequence":"first","affiliation":[{"name":"ADepartamento de Biologia and CESAM, Universidade de Aveiro, Campus Universit\u00e1rio de Santiago, PT-3810-193 Aveiro, Portugal."},{"name":"FCorresponding author. Present address: Department of Fish Ecology and Evolution, Eawag: Swiss Federal Institute of Aquatic Science and Technology, Center for Ecology, Evolution and Biogeochemistry, Seestrasse 79, CH-6047 Kastanienbaum, Switzerland. Email: miguelcleal@gmail.com"}]},{"given":"Igor C. S.","family":"Cruz","sequence":"additional","affiliation":[{"name":"BPrograma de P\u00f3s-Gradua\u00e7\u00e3o em Ecologia e Evolu\u00e7\u00e3o, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, RJ, Brazil."}]},{"given":"Carlos R.","family":"Mendes","sequence":"additional","affiliation":[{"name":"CInstituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Avenida It\u00e1lia, quil\u00f4metro 8, Rio Grande, RS, 96203-900, Brazil."}]},{"given":"Ricardo","family":"Calado","sequence":"additional","affiliation":[{"name":"ADepartamento de Biologia and CESAM, Universidade de Aveiro, Campus Universit\u00e1rio de Santiago, PT-3810-193 Aveiro, Portugal."}]},{"given":"Ruy K. 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