Major biogeographic barriers in eastern Australia have shaped the population structure of widely distributed Eucalyptus moluccana and its putative subspecies

Abstract We have investigated the impact of recognized biogeographic barriers on genetic differentiation of grey box (Eucalyptus moluccana), a common and widespread tree species of the family Myrtaceae in eastern Australian woodlands, and its previously proposed four subspecies moluccana, pedicellat...

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Autores principales:	Lluvia Flores‐Rentería, Paul D. Rymer, Niveditha Ramadoss, Markus Riegler
Formato:	article
Lenguaje:	EN
Publicado:	Wiley 2021
Materias:	Eastern Australia Eucalyptus moluccana geographic barriers grey box subspecies formation Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/52231cbb161d47f7871a5432f43a8a41
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spelling	oai:doaj.org-article:52231cbb161d47f7871a5432f43a8a412021-11-08T17:10:40ZMajor biogeographic barriers in eastern Australia have shaped the population structure of widely distributed Eucalyptus moluccana and its putative subspecies2045-775810.1002/ece3.8169https://doaj.org/article/52231cbb161d47f7871a5432f43a8a412021-11-01T00:00:00Zhttps://doi.org/10.1002/ece3.8169https://doaj.org/toc/2045-7758Abstract We have investigated the impact of recognized biogeographic barriers on genetic differentiation of grey box (Eucalyptus moluccana), a common and widespread tree species of the family Myrtaceae in eastern Australian woodlands, and its previously proposed four subspecies moluccana, pedicellata, queenslandica, and crassifolia. A range of phylogeographic analyses were conducted to examine the population genetic differentiation and subspecies genetic structure in E. moluccana in relation to biogeographic barriers. Slow evolving markers uncovering long term processes (chloroplast DNA) were used to generate a haplotype network and infer phylogeographic barriers. Additionally, fast evolving, hypervariable markers (microsatellites) were used to estimate demographic processes and genetic structure among five geographic regions (29 populations) across the entire distribution of E. moluccana. Morphological features of seedlings, such as leaf and stem traits, were assessed to evaluate population clusters and test differentiation of the putative subspecies. Haplotype network analysis revealed twenty chloroplast haplotypes with a main haplotype in a central position shared by individuals belonging to the regions containing the four putative subspecies. Microsatellite analysis detected the genetic structure between Queensland (QLD) and New South Wales (NSW) populations, consistent with the McPherson Range barrier, an east‐west spur of the Great Dividing Range. The substructure was detected within QLD and NSW in line with other barriers in eastern Australia. The morphological analyses supported differentiation between QLD and NSW populations, with no difference within QLD, yet some differentiation within NSW populations. Our molecular and morphological analyses provide evidence that several geographic barriers in eastern Australia, including the Burdekin Gap and the McPherson Range have contributed to the genetic structure of E. moluccana. Genetic differentiation among E. moluccana populations supports the recognition of some but not all the four previously proposed subspecies, with crassifolia being the most differentiated.Lluvia Flores‐RenteríaPaul D. RymerNiveditha RamadossMarkus RieglerWileyarticleEastern AustraliaEucalyptus moluccanageographic barriersgrey boxsubspecies formationEcologyQH540-549.5ENEcology and Evolution, Vol 11, Iss 21, Pp 14828-14842 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Eastern Australia Eucalyptus moluccana geographic barriers grey box subspecies formation Ecology QH540-549.5
spellingShingle	Eastern Australia Eucalyptus moluccana geographic barriers grey box subspecies formation Ecology QH540-549.5 Lluvia Flores‐Rentería Paul D. Rymer Niveditha Ramadoss Markus Riegler Major biogeographic barriers in eastern Australia have shaped the population structure of widely distributed Eucalyptus moluccana and its putative subspecies
description	Abstract We have investigated the impact of recognized biogeographic barriers on genetic differentiation of grey box (Eucalyptus moluccana), a common and widespread tree species of the family Myrtaceae in eastern Australian woodlands, and its previously proposed four subspecies moluccana, pedicellata, queenslandica, and crassifolia. A range of phylogeographic analyses were conducted to examine the population genetic differentiation and subspecies genetic structure in E. moluccana in relation to biogeographic barriers. Slow evolving markers uncovering long term processes (chloroplast DNA) were used to generate a haplotype network and infer phylogeographic barriers. Additionally, fast evolving, hypervariable markers (microsatellites) were used to estimate demographic processes and genetic structure among five geographic regions (29 populations) across the entire distribution of E. moluccana. Morphological features of seedlings, such as leaf and stem traits, were assessed to evaluate population clusters and test differentiation of the putative subspecies. Haplotype network analysis revealed twenty chloroplast haplotypes with a main haplotype in a central position shared by individuals belonging to the regions containing the four putative subspecies. Microsatellite analysis detected the genetic structure between Queensland (QLD) and New South Wales (NSW) populations, consistent with the McPherson Range barrier, an east‐west spur of the Great Dividing Range. The substructure was detected within QLD and NSW in line with other barriers in eastern Australia. The morphological analyses supported differentiation between QLD and NSW populations, with no difference within QLD, yet some differentiation within NSW populations. Our molecular and morphological analyses provide evidence that several geographic barriers in eastern Australia, including the Burdekin Gap and the McPherson Range have contributed to the genetic structure of E. moluccana. Genetic differentiation among E. moluccana populations supports the recognition of some but not all the four previously proposed subspecies, with crassifolia being the most differentiated.
format	article
author	Lluvia Flores‐Rentería Paul D. Rymer Niveditha Ramadoss Markus Riegler
author_facet	Lluvia Flores‐Rentería Paul D. Rymer Niveditha Ramadoss Markus Riegler
author_sort	Lluvia Flores‐Rentería
title	Major biogeographic barriers in eastern Australia have shaped the population structure of widely distributed Eucalyptus moluccana and its putative subspecies
title_short	Major biogeographic barriers in eastern Australia have shaped the population structure of widely distributed Eucalyptus moluccana and its putative subspecies
title_full	Major biogeographic barriers in eastern Australia have shaped the population structure of widely distributed Eucalyptus moluccana and its putative subspecies
title_fullStr	Major biogeographic barriers in eastern Australia have shaped the population structure of widely distributed Eucalyptus moluccana and its putative subspecies
title_full_unstemmed	Major biogeographic barriers in eastern Australia have shaped the population structure of widely distributed Eucalyptus moluccana and its putative subspecies
title_sort	major biogeographic barriers in eastern australia have shaped the population structure of widely distributed eucalyptus moluccana and its putative subspecies
publisher	Wiley
publishDate	2021
url	https://doaj.org/article/52231cbb161d47f7871a5432f43a8a41
work_keys_str_mv	AT lluviafloresrenteria majorbiogeographicbarriersineasternaustraliahaveshapedthepopulationstructureofwidelydistributedeucalyptusmoluccanaanditsputativesubspecies AT pauldrymer majorbiogeographicbarriersineasternaustraliahaveshapedthepopulationstructureofwidelydistributedeucalyptusmoluccanaanditsputativesubspecies AT niveditharamadoss majorbiogeographicbarriersineasternaustraliahaveshapedthepopulationstructureofwidelydistributedeucalyptusmoluccanaanditsputativesubspecies AT markusriegler majorbiogeographicbarriersineasternaustraliahaveshapedthepopulationstructureofwidelydistributedeucalyptusmoluccanaanditsputativesubspecies
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Major biogeographic barriers in eastern Australia have shaped the population structure of widely distributed Eucalyptus moluccana and its putative subspecies

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