Title
Historical biogeography of Caribbean Podocarpus does not support the progression rule
Date Issued
01 March 2021
Access level
metadata only access
Resource Type
journal article
Author(s)
Nieto-Blázquez M.E.
Peña-Castillo L.
Memorial University of Newfoundland
Publisher(s)
Blackwell Publishing Ltd
Abstract
Aim: The Progression Rule, that older lineages inhabit older islands and colonize newer ones as they emerge, has seldom been tested in the Caribbean due to its geological complexity. Here, we use the conifer genus Podocarpus to explore this hypothesis. We infer the evolutionary history, biogeography, and diversification rates of this genus under a hypothesis testing framework. Location: The Caribbean archipelago (Antilles). Taxon: Podocarpus (Podocarpaceae). Methods: We present the most comprehensive sampling for Caribbean Podocarpus to date in a Bayesian dated phylogenetic tree using a genotyping by sequencing DNA matrix of 67,589 bp. We inferred ancestral ranges and inter-island divergence patterns using several models available. We explored diversification rates associated with island colonization, and checked for diversification rate shifts in the phylogeny. Results: Caribbean Podocarpus is the result of colonization from the Andes during the Eocene to Oligocene (c. 45–31 Ma). Lesser Antillean species originated during the Oligocene from the Andes or the Greater Antilles, depending on the model of choice. Vicariance can explain the divergence of Cuban and Hispaniolan species, with subsequent dispersals into Jamaica. Despite the availability of new habitat opportunities, which might promote cladogenesis, insular Podocarpus did not show higher diversification rates than continental taxa. Main conclusions: The conditions for progression rule were not met because colonization of younger islands (Lesser Antilles) occurred from the continent, or because suitable habitat in the partially emerged younger islands was likely present at the time older islands (Greater Antilles) were colonized. An improved palaeogeographical knowledge of the Caribbean will allow testing this hypothesis in multiple lineages. Our finding that diversification rates did not increase with island colonization might be common in other Caribbean lineages. Genotyping by sequencing proved promising to reveal complex historical assembly processes of vicariance and dispersal at a fine phylogenetic scale.
Start page
690
End page
702
Volume
48
Issue
3
Language
English
OCDE Knowledge area
Ciencias de las plantas, Botánica Geografía física
Scopus EID
2-s2.0-85097072020
Source
Journal of Biogeography
ISSN of the container
03050270
Sponsor(s)
Discovery Grants from the Natural Sciences and Engineering Research Council of Canada to JR and LPC; School of Graduate Studies, and the President’s Doctoral Investment Fund of Memorial University to MENB This work was funded by a Canadian NSERC‐Discovery grant (RGPIN‐2014‐03976) to JR, the School of Graduate Studies, and the President's Doctoral Investment fund of MUN to M.E.N.B. We are grateful to Paula Quiroga, Monica Moraes, the Royal Botanic Gardens Edinburgh, Royal Botanic Gardens Kew, and the Montgomery Botanical Center for sharing leaf and DNA samples. We also want to thank Ramona Oviedo, Francisco Jiménez and Teodoro Clase for facilitating collections in Cuba and the Dominican Republic. We appreciate the constructive comments from the editors, one anonymous reviewer and Fabien Condamine which significantly improved the quality of this manuscript. This research was facilitated by computer infrastructure from ACENET ( www.ace‐net.ca ) and Compute Canada ( www.computecanada.ca ).
Sources of information: Directorio de Producción Científica Scopus