Invasions threatening eucalyptus and pine ecosystems in Portugal: role of disturbances and of native species

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Invasions threatening eucalyptus and pine ecosystems in Portugal: role of disturbances and of native species Maria Rosa PAIVA1,2 Sofia BRANCO1,2 and Manuela BRANCO2 1 Centro de Estudos Florestais, Instituto Superior de Agronomia, Lisboa, Portugal; 2 DCEA, Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal. mrp@fct.unl.pt Invasive Alien Species (IAS) are organisms non-native to an ecosystem which may cause economic and/or environmental harm, while also constituting a significant component of global environmental change. In parallel with the global trend, invasions of forest ecosystems in Portugal by IAS, have sharply risen over the past decades and threaten both mixed woods and monospecific plantations. We analyse the present situation regarding invasiveness of two of the three most important production forest types: plantations of Eucalyptus sp. (mostly E. globulus), an exotic genus in Portugal, and of Pinus spp, mostly P. pinaster and P. pinea. Over the past three decades, eucalyptus have been attacked by an increasing number of pests and diseases, causing economic impacts to productivity and requiring the adoption of complex measures of control, some of which based upon the use of exotic natural enemies. Regarding pine stands, although attacks by a few new pests and diseases have occurred, a major threat is posed by plant invasions, mainly by a sequence of species of Acacia, which easily reach the phases of establishment and spread. Within this context, we analyse the role of disturbances, as well as of some native or previously naturalized species, which have successfully integrated the new food webs, like pollinators and seed dispersers, as facilitators of IAS success. Although the implementation of mitigation measures is not straightforward, we compare some forest management regimes which can contribute to contain the problem. Keywords: invasive exotic species, eucalyptus plantations, pine plantations, management regimes. http://www.iufro.org/publications/proceedings/proceedings-meetings-2012/

Original languageUnknown
Title of host publicationIUFRO Conference, Division 5 Forest Products, 8-13 July, Estoril, PT.
Pages******
Publication statusPublished - 1 Jan 2012
EventIUFRO Conference, Division 5 Forest Products, 8-13 July, Estoril, PT. -
Duration: 1 Jan 2012 → …

Conference

ConferenceIUFRO Conference, Division 5 Forest Products, 8-13 July, Estoril, PT.
Period1/01/12 → …

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