Biogeographic Affinities of Dictyotales from Madagascar: A Phylogenetic Approach

Steen, Frédérique; Vieira, Christophe; Leliaert, Frédérik; Payri, Claude; Clerck, Olivier De

doi:10.7872/crya.v36.iss2.2015.129

Cited by 22 publications

(16 citation statements)

References 16 publications

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“…The Asian affinities of many plants and animals in Madagascar, as well as other marine algae, have been published (Yoder and Nowak 2006, Warren et al 2010, Steen et al 2015, Verbruggen and Costa 2015. Interestingly, P. hildebrandtii, which occurs in Madagascar and eastern Africa, clustered with Asian species in both the phylogeny and RASP analysis.…”

Section: Discussionmentioning

confidence: 96%

“…, Steen et al. , Verbruggen and Costa ). Interestingly, P. hildebrandtii , which occurs in Madagascar and eastern Africa, clustered with Asian species in both the phylogeny and RASP analysis.…”

Section: Discussionmentioning

confidence: 97%

“…, Steen et al. , Verbruggen and Costa ). Endemism has received little attention because of the limited number of taxonomic studies on seaweeds from Madagascar.…”

mentioning

confidence: 97%

“…However, the Malagasy marine algal flora is one of the least studied in the Indian Ocean. Marine algae from southeastern Madagascar were collected during the Atimo Vatae expedition which took place in 2010; these collections have been used for updating distributional records and for the description of new species in the Gelidiales, Gigartinales and Halymeniales (Rhodophyta), Dictyotales and Fucales (Phaeophyceae), and Bryopsidales (Chlorophyta; Boo et al 2015, 2016a, Mattio et al 2015, Steen et al 2015, Verbruggen and Costa 2015. Endemism has received little attention because of the limited number of taxonomic studies on seaweeds from Madagascar.…”

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confidence: 99%

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Phylogenetic relationships and biogeography of Ptilophora (Gelidiales, Rhodophyta) with descriptions of P. aureolusa, P. malagasya, and P. spongiophila from Madagascar

Boo

Gall

Hwang

et al. 2018

Journal of Phycology

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The genus Ptilophora currently includes 16 species occurring mostly in subtidal habitats of the Indo-Pacific Ocean, but its global diversity and biogeography are poorly understood. We analyzed mitochondrial cox1, plastid rbcL and plastid psbA sequences from specimens collected in southern Madagascar during the 2010 Atimo Vatae expedition and studied their morphologies. Both morphological and molecular data sets demonstrated the presence of five species in southern Madagascar: Ptilophora hildebrandtii, P. pterocladioides, and three new species described here, P. aureolusa, P. malagasya, and P. spongiophila. Ptilophora aureolusa is distinguished by its compound pinnae with uniformly spaced pinnules. Ptilophora malagasya has an indistinct midrib and irregularly spaced pinnules. Ptilophora spongiophila, heavily coated with sponges, has cylindrical to flattened main axes, lateral and surface proliferations, and spatulate tetrasporangial sori. The species of Ptilophora found in Madagascar are endemic, except P. hildebrandtii, which also occurs in eastern Africa. Ptilophora comprises four phylogenetic groups that map to eastern Australia, Japan, western Australia/Southeast Asia/Madagascar/eastern Africa, and Madagascar/eastern Africa/Aegean Sea. Biogeographical analysis revealed that the ancestor of Ptilophora originated in Australia, but most of the species radiated from Madagascar.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 97%

“…, Steen et al. , Verbruggen and Costa ). Endemism has received little attention because of the limited number of taxonomic studies on seaweeds from Madagascar.…”

mentioning

confidence: 97%

mentioning

confidence: 99%

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Phylogenetic relationships and biogeography of Ptilophora (Gelidiales, Rhodophyta) with descriptions of P. aureolusa, P. malagasya, and P. spongiophila from Madagascar

Boo

Gall

Hwang

et al. 2018

Journal of Phycology

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“…At each site, tissue samples 142 from a minimum of 20 specimens separated at least 1m from one another were stored in silica 143gel. 144Microsatellite development was based on genomic DNA extracted from one specimen using an 145 adapted CTAB method(Steen et al 2015) and sequenced with the Ion Torrent PGM sequencer. 146…”

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confidence: 99%

Population structure and geographically structured reproductive strategies of the haplodiplontic seaweedDictyota dichotoma

Steen

Verlaque

D’hondt

et al. 2019

Preprint

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12Both mating system variation and the propensity of many seaweeds to reproduce both sexually 13 and asexually, leave a strong imprint in the genetic structure of species. In this respect, we study 14 the population genetic structure of Dictyota dichotoma, a common haplodiplont brown subtidal 15 seaweed. This benthic species is widespread in the NE-Atlantic, from the Canary Islands and 16Mediterranean Sea to southern Norway, but lately populations have been reported from 17Argentina and South Africa. Phenology and reproduction of D. dichotoma was monitored year-18 round in four populations to investigate how the species has adapted to the steep thermal 19 gradient in southern and northern ranges of its distribution. Thirteen microsatellites are 20 developed in order to assess patterns of population diversity and structure across the 21 biogeographic range, as shaped by past and present processes. Last, we assess the genetic 22

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

et al. 2021

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A floristic survey of the marine algal biodiversity of Antsiranana Bay, northern Madagascar, was conducted during November 2018. This represents the first inventory encompassing the three major macroalgal classes (Phaeophyceae, Florideophyceae 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 Florideophyceae and 30 Ulvophyceae. Barcoding of the chloroplast-encoded rbcL gene was used for the three algal classes, in addition to tufA for the Ulvophyceae. This study significantly increases our knowledge of the Malagasy marine biodiversity while augmenting the rbcL and tufA algal reference libraries for DNA barcoding. These efforts resulted in a total of 72 new species records for Madagascar. Combining our own data with the literature, we also provide an updated catalogue of 442 taxa of marine benthic macroalgae from Madagascar, comprising 85 Phaeophyceae, 1 Compsopogonophyceae, 240 Florideophyceae and 116 Ulvophyceae. This diversity holds 29 (ca. 6.5%) 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.

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Biogeographic Affinities of Dictyotales from Madagascar: A Phylogenetic Approach

Cited by 22 publications

References 16 publications

Phylogenetic relationships and biogeography of Ptilophora (Gelidiales, Rhodophyta) with descriptions of P. aureolusa, P. malagasya, and P. spongiophila from Madagascar

Phylogenetic relationships and biogeography of Ptilophora (Gelidiales, Rhodophyta) with descriptions of P. aureolusa, P. malagasya, and P. spongiophila from Madagascar

Population structure and geographically structured reproductive strategies of the haplodiplontic seaweedDictyota dichotoma

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

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