Diversity and phylogeny of Halymeniales order (Rhodophyta) on the coast of Brazil

Abstract

The red algal order Halymeniales is a group that exhibits a problematic taxonomy, with nomenclature changes and misapplied identifications. Researchers have investigated the systematics of Halymeniales based on morphological and molecular techniques worldwide, promoting recognition of new genus and species, correction of misapplied taxonomic identifications and discovery of cryptic diversity in the group. The Halymeniales are used as human food, synthesize phycocolloids and bioactive compounds. Besides that, some species have been reported as invasors. In Brazil, there is a lack of systematic studies of Halymeniales, that presents approximately 22 species. Therefore, the biological diversity is possibly underestimated and the sustainable utilization of marine resources is prevented. The aims of this study is to investigate diversity and phylogeny of Halymeniales in Brazil, through morphological and molecular techniques. Seaweeds will be collected along Brazilian coast. Analysis of herbarium specimens and database genomic sequences will be included. This study will investigate two molecular markers, the plastid gene rbcL, commonly used in red algae phylogenetic studies, and the mitochondrial gene cox1 (DNA barcode), that hasn't been used in Halymeniales yet. The results will be added to a Rhodophyta species database (FAPESP Thematic Project 2007/51 270-7). (AU)