Inter-regional hybrids of native and non-native Centaurea sulphurea inherit increased competitive ability from the non-natives

Filipe, Joao C., and Montesinos Torres, Daniel (2016) Inter-regional hybrids of native and non-native Centaurea sulphurea inherit increased competitive ability from the non-natives. Plant Ecology & Diversity, 9 (4). pp. 381-386.

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Background: Exotic species can rapidly develop adaptations to their non-native regions, such as increased size and competitive ability. Although these traits are believed to be responsible for invasive success, some non-invasive exotic species display them too. This suggests that increased size and competitive ability might be necessary but not sufficient to turn an exotic into a successful invader.

Aim: To assess size and competitive ability of the exotic non-invasive weed Centaureasulphurea, and of inter-regional hybrids between native and non-native populations.

Methods: We experimentally produced a cohort of C. sulphurea individuals from the native range of the species in Spain, from its non-native range in California, as well as hybrids between the two regions. We grew these plants in pots in competition with the grass Bromus hordeaceus, or alone in control pots.

Results: Individuals from California were larger and better competitors than individuals from Spain. Furthermore, inter-regional hybrids showed competitive responses similar to that of individuals from California.

Conclusions: Our results confirm that increased competitive ability might be more frequent than previously thought among introduced species, since it can be detected in at least some exotic non-invasive species. They also illustrate the importance of maternal effects, how locally adapted traits are conserved and spread in the non-native ranges of exotic species, and suggest that plant size and competitive ability are not directly associated in this species.

Item ID: 57703
Item Type: Article (Research - C1)
ISSN: 1755-1668
Keywords: biogeography; competitive ability; exotic species; inter-regional hybrids; RII
Funders: Portuguese Fundacao para a Ciencia e a Tecnologia - FCT, European Union via QREN, European Commission (EC), European Union via COMPETE, European Union via FEDER
Projects and Grants: FCT PCT/BIA-PLA/3389/2012, FCT IF-00066-2013, EC FP7-PEOPLE-MC-CIG-321909
Date Deposited: 26 Mar 2019 02:24
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310308 Terrestrial ecology @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 100%
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