Intercontinental long-distance seed dispersal across the Mediterranean Basin explains population genetic structure of a bird-dispersed shrub.



Martínez-López, V, García, C, Zapata, V, Robledano, F and De la Rúa, P
(2020) Intercontinental long-distance seed dispersal across the Mediterranean Basin explains population genetic structure of a bird-dispersed shrub. Molecular ecology.

WarningThere is a more recent version of this item available.
Access the full-text of this item by clicking on the Open Access link.
[img] Text
10.1111mec.15413.pdf - Author Accepted Manuscript

Download (17MB) | Preview

Abstract

Long-distance dispersal (LDD) is a pivotal process for plants determining their range of distribution and promoting gene flow among distant populations. Most fleshy-fruited species rely on frugivorous vertebrates to disperse their seeds across the landscape. While LDD events are difficult to record, a few ecological studies have shown that birds move a sizeable number of ingested seeds across geographic barriers, such as sea straits. The foraging movements of migrant frugivores across distant populations, including those separated by geographic barriers, creates a constant flow of propagules that in turn shapes the spatial distributions of the genetic variation in populations. Here, we have analysed the genetic diversity and structure of 74 populations of Pistacia lentiscus, a fleshy-fruited shrub widely distributed in the Mediterranean Basin, to elucidate whether the Mediterranean Sea acts as a geographic barrier or alternatively whether migratory frugivorous birds promote gene flow among populations located on both sides of the sea. Our results show reduced genetic distances among populations, including intercontinental populations, and they show a significant genetic structure across an eastern-western axis. These findings are consistent with known bird migratory routes that connect the European and African continents following a north-southwards direction during the fruiting season of many fleshy-fruited plants. Further, Approximate Bayesian Analysis failed to explain the observed patterns as a result of historical population migrations at the end of Last Glacial Maximum. Therefore, anthropic and/or climatic changes that would disrupt the migratory routes of frugivorous birds might have genetic consequences for the plant species they feed upon.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 18 Mar 2020 08:45
Last Modified: 18 Jan 2023 23:57
DOI: 10.1111/mec.15413
Open Access URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/me...
URI: https://livrepository.liverpool.ac.uk/id/eprint/3079467

Available Versions of this Item