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(A) The worldwide distribution of U. compressa and related populations including U. mutabilis (black circles; rbcL haplotypes available through NCBI GenBank) are presented as an example of the cosmopolitan nature of Ulva spp. The sea surface temperature map was plotted using Bio-ORACLE1 (Tyberghein et al., 2012). (B) Ulva can cause green tides, e.g., in the lagoon Ria Formosa (Portugal). Photo is a courtesy of Dr. Eric-Jan Malta (IFAPA, Spain).
