Abstract

PENA-SALAMANCA, Enrique. The complex Bostrychetium: The algal flora associated to mangrove roots in the Pacific coast of Colombia. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2017, vol.41, n.160, pp.338-348. ISSN 0370-3908.  https://doi.org/10.18257/raccefyn.485.

The Bostrychietum complex is known as an algal assemblage associated with mangrove roots in tropical and subtropical areas. This review presents an analysis of the taxonomy, phylogeny and ecophysiology of Bostrychia species present in the Colombian Pacific Coast. Taxonomic and morphological studies have concluded that the following Bostrychia morphotypes are present: B. calliptera y B. pinnata (morpho 1), B. moritziana y B. radicans (morpho 2), B. tenella (morpho 3), B. binderi (morpho 4). B. pinnata is considered a synonym of B. calliptera, and B. moritziana and B. radicans are a group with differentiated morphology. The evaluation of nuclear, plastidic and mitochondrial genes, as well as complementary descriptions of Bostrychia taxonomic characters, has determined that the complex is non-monophyletic, that it is taxonomically indistinguishable and that it comprises three evolutionary lineages. From an ecophysiological point of view, Bostrychetum complex species are continuously exposed to extreme changes in the light regime, salinity and the tidal levels. B. calliptera and C. leprieurii exhibited positive photosynthesis activity in water and air. Such physiological response shows their capacity to survive to dessication periods during low tide and it explains the zonation pattern and the algal assamblages associated to mangrove roots. This review proposes research perspectives to complement species taxonomic and phylogenetic studies and to evaluate their resistance to intertidal environmental stress in mangrove forests.

Keywords : Bostrychia; Mangrove; Phylogeny, Morphotypes, Plastidic DNA RBC, Mitochondrial gene Cox 2-3, Photosynthesis, Stress tolerance.

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