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Patterns and drivers of species diversity in the Indo‐Pacific red seaweed Portieria
Author(s) -
Leliaert Frederik,
Payo Dioli Ann,
Gurgel Carlos Frederico D.,
Schils Tom,
Draisma Stefano G. A.,
Saunders Gary W.,
Kamiya Mitsunobu,
Sherwood Alison R.,
Lin ShoweMei,
Huisman John M.,
Le Gall Line,
Anderson Robert J.,
Bolton John J.,
Mattio Lydiane,
Zubia Mayalen,
Spokes Tracey,
Vieira Christophe,
Payri Claude E.,
Coppejans Eric,
D'hondt Sofie,
Verbruggen Heroen,
De Clerck Olivier
Publication year - 2018
Publication title -
journal of biogeography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 158
eISSN - 1365-2699
pISSN - 0305-0270
DOI - 10.1111/jbi.13410
Subject(s) - biological dispersal , ecology , biology , indo pacific , biogeography , species richness , archipelago , range (aeronautics) , biodiversity , genetic diversity , population , materials science , demography , sociology , composite material
Aim Biogeographical processes underlying Indo‐Pacific biodiversity patterns have been relatively well studied in marine shallow water invertebrates and fishes, but have been explored much less extensively in seaweeds, despite these organisms often displaying markedly different patterns. Using the marine red alga Portieria as a model, we aim to gain understanding of the evolutionary processes generating seaweed biogeographical patterns. Our results will be evaluated and compared with known patterns and processes in animals. Location Indo‐Pacific marine region. Methods Species diversity estimates were inferred using DNA ‐based species delimitation methods. Historical biogeographical patterns were inferred based on a six‐gene time‐calibrated phylogeny, distribution data of 802 specimens, and probabilistic modelling of geographical range evolution. The importance of geographical isolation for speciation was further evaluated by population genetic analyses at the intraspecific level. Results We delimited 92 candidate species, most with restricted distributions, suggesting low dispersal capacity. Highest species diversity was found in the Indo‐Malay Archipelago ( IMA ). Our phylogeny indicates that Portieria originated during the late Cretaceous in the area that is now the Central Indo‐Pacific. The biogeographical history of Portieria includes repeated dispersal events to peripheral regions, followed by long‐term persistence and diversification of lineages within those regions, and limited dispersal back to the IMA . Main conclusions Our results suggest that the long geological history of the IMA played an important role in shaping Portieria diversity. High species richness in the IMA resulted from a combination of speciation at small spatial scales, possibly as a result of increased regional habitat diversity from the Eocene onwards, and species accumulation via dispersal and/or island integration through tectonic movement. Our results are consistent with the biodiversity feedback model, in which biodiversity hotspots act as both “centres of origin” and “centres of accumulation,” and corroborate previous findings for invertebrates and fish that there is no single unifying model explaining the biological diversity within the IMA .