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Web Ecol., 18, 91-103, 2018
https://doi.org/10.5194/we-18-91-2018 © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. 
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Standard article
24 May 2018
1Centro de Estudos do Ambiente e do Mar (CESAM), Centro de
Biotecnologia Vegetal (CBV), Faculdade de Ciências da
Universidade de Lisboa, Lisbon, 1749-016, Portugal
2Center for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências da Universidade de Lisboa, Lisbon, 1749-016, Portugal
Received: 30 Jan 2018 – Revised: 27 Apr 2018 – Accepted: 04 May 2018 – Published: 24 May 2018
Abstract. Acacia longifolia
is an aggressive invader worldwide. This species was brought to
Portugal by the forestry services and is now found throughout the
country with very strong ecological and social impacts. Although several
ecological and physiological studies have been carried out, molecular
studies in this species are sparse. Particularly, genetic variability
evaluation in invasive ranges clearly deserves more attention. The aim
of this study was to evaluate the genetic diversity and the genetic
differentiation among populations of the alien invasive A. longifolia
under different Mediterranean conditions. For that we studied three
sandy dune populations along the Portuguese coast: Osso da Baleia
(mesomediterranean), Pinheiro da Cruz and Vila Nova de Milfontes
(termomediterranean). All sampled acacia plants were located underneath
a pine forest, with the exception of the latter case study, where
we also sampled in a diversified habitat conditions associated with
the margins of agriculture fields. According to the historical records,
it was also possible to compare acacia samples from original
plantations and recently invaded areas. We have used two molecular
markers – inter-simple sequence repeats (ISSR) and microsatellites
(SSR). ISSR analysis showed that A. longifolia populations at all sampled locations have similar levels of diversity and a relatively low differentiation (ΦPT
= 0.135). However, samples tended to cluster according to the regional
(macro-scale) collection site. Microsatellites confirmed this low
differentiation pattern. Our results indicate that differences in
phenology and reproductive success observed during a previous study
cannot be accounted for by genetic diversity and differentiation alone.
Furthermore, our results taken together with historical information of A. longifolia suggest a single original introduction and a subsequent acclimation process.
Citation: Vicente, S., Máguas, C., and Trindade, H.: Genetic diversity and differentiation of invasive Acacia longifolia in Portugal, Web Ecol., 18, 91-103, https://doi.org/10.5194/we-18-91-2018, 2018.
2Center for Ecology, Evolution and Environmental Changes (cE3c), Faculdade de Ciências da Universidade de Lisboa, Lisbon, 1749-016, Portugal
Citation: Vicente, S., Máguas, C., and Trindade, H.: Genetic diversity and differentiation of invasive Acacia longifolia in Portugal, Web Ecol., 18, 91-103, https://doi.org/10.5194/we-18-91-2018, 2018.
