The risk of pollen-mediated gene flow from exotic Corymbia plantations into native Corymbia populations in Australia

Barbour, RC; Crawford, Allison C; Henson, Michael; Lee, David J; Potts, Brad M.; Shepherd, Mervyn

doi:10.1016/j.foreco.2008.03.028

Cited by 36 publications

(42 citation statements)

References 93 publications

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“…A similar low level of flowering activity was evident at a nearby trial during the same years (2010 and 2011; Emu Creek, 15 km west of the Bonalbo trial; data not shown) and in other plantings in northern NSW (Barbour et al 2008), suggesting that this low level of flowering activity at the Bonalbo trial was typical for similar-aged plantings of spotted gum in the region.…”

Section: Few Trees Flowered and Overall Flowering Intensity Was Lowsupporting

confidence: 62%

“…in recent decades in Australia has entailed large scale movement of germplasm around some regions of the country (Potts et al 2003;Gavran and Parsons 2009). This movement resulted in increased exposure of the native populations to risks of locally exotic gene flow (Barbour et al 2008). Awareness and concern over these risks have resulted in increased research to support sustainable forest management policy and certification practices (Potts et al 2001;Australian Forestry Standard Limited 2007;Barbour et al 2008;Laikre et al 2010;Forest Stewardship Council 2012).…”

Section: Introductionmentioning

confidence: 99%

“…i.e. bloodwoods) to gene flow from locally exotic taxa that are inter-fertile (Barbour et al 2008). In recent years, commercial plantations of CCV have been derived from one or a few select provenances in the north of its range, particularly Woondum provenance near Gympie, Qld, which is genetically and adaptively differentiated both from the CCV and CH provenances from NSW including its higher tolerance to Quambalaria shoot blight (QSB) (Johnson et al 2009;Brawner et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…In an assessment of the likelihood and impact of gene flow and hybridisation between planted and native CCV to other spotted gums in northern NSW, Barbour et al (2008) concluded that overall the likelihood of gene flow was high because taxa are highly inter-fertile and likely share common pollinators, including those able to travel long distances (Southerton et al 2004;Bacles et al 2009). The ecological and evolutionary impact of gene flow was more difficult to assess but the impacts are likely to be less profound in such widespread and abundant species, and none are considered threatened or rare.…”

Section: Introductionmentioning

confidence: 99%

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Genetic control of flowering in spotted gum, Corymbia citriodora subsp. variegata and C. maculata

et al. 2014

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Abstract. Genetically controlled asynchrony in anthesis is an effective barrier to gene flow between planted and native forests. We investigated the degree of genetically controlled variation in the timing of key floral developmental stages in a major plantation species in subtropical Australia, Corymbia citriodora subsp. variegata K.D. Hill and L.A.S Johnson, and its relative C. maculata K.D. Hill and L.A.S. Johnson. Flowering observations were made in a common garden planting at Bonalbo in northern New South Wales in spring on 1855 trees from eight regions over three consecutive years, and monthly on a subset of 208 trees for 12 months. Peak anthesis time was stable over years and observations from translocated trees tended to be congruent with the observations in native stands, suggesting strong genetic control of anthesis time. A cluster of early flowering provenances was identified from the north-east of the Great Dividing Range. The recognition of a distinct flowering race from this region accorded well with earlier evidence of adaptive differentiation of populations from this region and geographically-structured genetic groupings in C. citriodora subsp. variegata. The early flowering northern race was more fecund, probably associated with its disease tolerance and greater vigour. Bud abundance fluctuated extensively at the regional level across 3 years suggesting bud abundance was more environmentally labile than timing of anthesis. Overall the level of flowering in the planted stand (age 12 years) was low (8-12% of assessed trees with open flowers), and was far lower than in nearby native stands. Low levels of flowering and asynchrony in peak anthesis between flowering races of C. citriodora subsp. variegata may partially mitigate a high likelihood of gene flow where the northern race is planted in the south of the species range neighbouring native stands.

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Section: Few Trees Flowered and Overall Flowering Intensity Was Lowsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic control of flowering in spotted gum, Corymbia citriodora subsp. variegata and C. maculata

et al. 2014

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“…Risk of genetic invasion at the recipient site is not often considered in movement of plants and animals in Australia, although genetic risk is considered in eucalypt plantations (Potts et al 2003;Barbour et al 2008a, b) and a genetic risk assessment has recently been developed for implementation in revegetation programmes (Byrne et al in press). In addition, a decision tree for prediction of outbreeding depression in rare species translocations of both plants and animals has recently been developed (Frankham et al 2011).…”

Section: Risk Analysismentioning

confidence: 99%

Is Australia ready for assisted colonization? Policy changes required to facilitate translocations under climate change.

Burbidge¹,

Byrne²,

Coates³

et al. 2011

Pac. Conserv. Biol.

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Assisted Colonization (AC) has been proposed as one method of aiding species to adapt to the impacts of climate change. AC is a form of translocation and translocation protocols for threatened species, mostly for reintroduction, are well established in Australia. We evaluate the information available from implementation of translocations to understand how existing policies and guidelines should be varied to plan, review and regulate AC. While the risks associated with AC are potentially greater than those of reintroductions, AC is likely to be the only available method, other than germplasm storage and establishment of captive populations, of conserving many taxa under future climate change. AC may also be necessary to maintain ecosystem services, particularly where keystone species are affected. Current policies and procedures for the preparation of Translocation Proposals will require modification and expansion to deal with Assisted Colonization, particularly in relation to risk management, genetic management, success criteria, moving associated species and community consultation. Further development of risk assessment processes, particularly for invasiveness, and guidelines for genetic management to maintain evolutionary potential are particularly important in the context of changing climate. Success criteria will need to respond to population establishment in the context of new and evolving ecosystems, and to reflect requirements for any co-establishment of interdependent species. Translocation Proposals should always be subjected to independent peer review before being considered by regulators. We conclude that consistent approaches by regulators and multilateral agreements between jurisdictions are required to minimize duplication, to ensure the risk of AC is adequately assessed and to ensure the potential benefits of AC are realized.

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Understanding the naturalization of Eucalyptus globulus in Portugal: a comparison with Australian plantations

et al. 2017

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The risk of pollen-mediated gene flow from exotic Corymbia plantations into native Corymbia populations in Australia

Cited by 36 publications

References 93 publications

Genetic control of flowering in spotted gum, Corymbia citriodora subsp. variegata and C. maculata

Genetic control of flowering in spotted gum, Corymbia citriodora subsp. variegata and C. maculata

Is Australia ready for assisted colonization? Policy changes required to facilitate translocations under climate change.

Understanding the naturalization of Eucalyptus globulus in Portugal: a comparison with Australian plantations

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