Unpublished conference/Abstract (Scientific congresses and symposiums)
Why are there so few endemics in island bryophytes? Macaronesian flora answers
Mirolo, Sébastien; Ledent, Alice; Patino Llorente, Jairo et al.
2024International Botanical Congress XX
 

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Keywords :
Bryophytes; Insular biogeography; Oceanic islands; Macaronesia; Coalescence; Ancestral Area Reconstruction; Endemism
Abstract :
[en] Among land plants, bryophytes exhibit the lowest rates of endemism on oceanic islands. This pattern has primarily been interpreted in terms of intense gene flow preventing speciation from the closest continental sources, so that endemism would have to originate from geographically remote sources through chance long-distance dispersal. Here, we test this hypothesis through a meta-analysis of species distribution patterns and phylogeographic analyses in the Macaronesian bryophyte flora. Our results reveal a striking mismatch between the strong similarity of the Macaronesian and Mediterranean floras, and the largely extra-Mediterranean origin of endemism that is, at first sight, compatible with this hypothesis. This hypothesis is, however, at odds with the significant genetic differentiation systematically found among populations disjunct between Macaronesia and the Mediterranean. Our reconstruction of the biogeographic origin of non-endemic species based on ABC analyses in a coalescent framework reveal a complex history of colonization of the archipelago from multiple continental sources, but also of continental colonization from island ancestors. Altogether, our results thus suggest that Macaronesian bryophyte flora originated from different sources depending on the variation of wind connectivity through time, triggering endemic speciation from various sources. While speciation rates may thus not have necessarily been lower than in other land plant lineages, the low rates of endemism among island bryophyte floras result from subsequent dispersal events towards continental areas.
Research Center/Unit :
InBios - Integrative Biological Sciences - ULiège
Disciplines :
Environmental sciences & ecology
Author, co-author :
Mirolo, Sébastien  ;  Université de Liège - ULiège > Integrative Biological Sciences (InBioS)
Ledent, Alice  ;  Université de Liège - ULiège > Integrative Biological Sciences (InBioS)
Patino Llorente, Jairo ;  Instituto de Productos Naturales y Agrobiología (IPNA-CSIC) > Island Ecology and Evolution Research Group (GEEI)
Vanderpoorten, Alain ;  Université de Liège - ULiège > Integrative Biological Sciences (InBioS)
Language :
English
Title :
Why are there so few endemics in island bryophytes? Macaronesian flora answers
Alternative titles :
[fr] Pourquoi y a-t-il si peu d'endémisme chez les bryophytes insulaires ? La flore macaronésienne répond
Original title :
[en] Why are there so few endemics in island bryophytes? Macaronesian flora answers
Publication date :
23 July 2024
Event name :
International Botanical Congress XX
Event place :
Madrid, Spain
Event date :
du 21 juillet 2024 au 27 juillet 2024
Audience :
International
References of the abstract :
XX International Botanical Congress IBC 2024, Spain. Book of Abstracts. Oral presentations. (Fase 20 Ediciones). (2024).
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Available on ORBi :
since 14 September 2024

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