NDLI: Pollen dispersal from exotic eucalypt plantations

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Conservation Genetics : Volume 6, Issue 1, January 2005

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Conservation Genetics : Volume 3

Conservation Genetics : Volume 2

Conservation Genetics : Volume 1

Pollen dispersal from exotic eucalypt plantations

Content Provider	Springer Nature Link
Author	Barbour, R. C. Potts, B. M. Vaillancourt, R. E.
Copyright Year	2005
Abstract	The introgression of genes from exotic species or populations into gene pools of native species is a widespread concern in agricultural systems. This is also an issue of increasing importance in forest systems as there has been a dramatic expansion of tree plantations, which have now reached 180 million ha globally. This has recently occurred in Australia with eucalypts. To help assess the risk of genetic pollution, we assess the pattern of realised pollen dispersal from exotic Eucalyptus nitens plantations into native E. ovata forest in Tasmania. We assessed the frequency of F1 hybrids in open-pollinated seed collected from native E. ovata trees located at varying distance from three exotic E. nitens plantations in Tasmania. Over 119,000 seedlings were screened for morphological markers diagnostic of each species and the F1 hybrid. F1 hybridisation averaged 7.2% within 100 m of the exotic E. nitens, with one native tree reaching 56%, but diminished to 0.7% by 200–300 m and continued at this low level to the limits of the sampling at 1.6 km. The decay in the percentage of interspecific F1 hybridisation with distance followed a power function with a negative exponent (%F1 = 91.435distance−0.789; R2=0.84). Eucalyptus nitens is exclusively pollinated by small insects (smaller than honeybees), which the study shows can disperse pollen over 1.6 km. However, the restriction of most exotic F1 hybridisation to within 200 m of exotic plantations presents clear opportunities to manage the genetic impacts of plantations on native forests.
Starting Page	253
Ending Page	257
Page Count	5
File Format	PDF
ISSN	15660621
Journal	Conservation Genetics
Volume Number	6
Issue Number	2
e-ISSN	15729737
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	buffer distance Eucalyptus exotic species gene flow insect pollination Human Genetics Evolutionary Biology Plant Sciences Animal Anatomy / Morphology / Histology
Content Type	Text
Resource Type	Article
Subject	Genetics Ecology, Evolution, Behavior and Systematics

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