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Marine macroalgal biodiversity of northern Madagascar: morpho-genetic systematics and implications of anthropic impacts for conservation

Vieira, Christophe and De Ramon N'Yeurt, Antoine and Faravavy, R.A. and D’Hondt, S. and Tran, L.A. and Van den Spiegel, D. and Hiroshi, K. and De Clerck, O. (2021) Marine macroalgal biodiversity of northern Madagascar: morpho-genetic systematics and implications of anthropic impacts for conservation. Biodiversity and Conservation, 30 . pp. 1-25. ISSN 0960-3115

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    Abstract

    A floristic survey of the marine algal biodiversity of Antsiranana Bay, northern Madagascar, was conducted in November 2018. This represents the first inventory encompassing the three major macroalgal classes (Phaeophyceae, Floridophyceae and Ulvophyceae) for the little-known Malagasy marine flora. Combining morphological and DNA-based approaches, we report from our collection a total of 110 species from northern Madagascar, including 30 species of Phaeophyceae, 50 Floridophyceae and 30 Ulvophyceae. Barcoding of rbcL was used for the three algal classes, in addition to tufA for the Ulvophyceae. This study significantly increases our knowledge of the Madagascar marine biodiversity while augmenting the rbcL and tufA algal reference libraries for DNA barcoding. A total of 72 new species records are made for Madagascar. Combining our own data with the literature, we also provide an updated catalogue of 450 taxa of marine benthic macroalgae from Madagascar, comprising 88 Phaeophyceae, 1 Compsopogonophyceae, 244 Floridophyceae and 117 Ulvophyceae. This diversity holds 32 (c. 7%) endemic species to Madagascar. Our results are discussed in the context of increasing threats to biodiversity on Madagascar’s coastal reefs from both anthropic and anthropogenic activities including sewage effluent runoffs and unsustainable agricultural practices such as massive deforestation, leading to ecosystem shifts to algal dominance on reefs, which are recommended to be addressed through integrated land-sea management in a Reef-to-Ridge conservation approach.

    Item Type: Journal Article
    Uncontrolled Keywords: algae, DNA-barcoding, conservation, Floridophyceae, Phaeophyceae, flora, Ulvophyceae
    Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
    Q Science > QC Physics > QC980-999 Climatology and weather
    Q Science > QK Botany
    Divisions: Pacific Centre for Environment and Sustainable Development (PACE-SD)
    Depositing User: Antoine N'Yeurt
    Date Deposited: 31 Mar 2021 09:59
    Last Modified: 31 Mar 2021 09:59
    URI: http://repository.usp.ac.fj/id/eprint/12737

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