Modelling the impact of defoliation by the leaf beetle, Chrysophtharta bimaculata (Coleoptera: Chrysomelidae), on height growth of Eucalyptus regnans

Candy, Steven G.; Elliott, H. J.; Bashford, Richard; Greener, Anna

doi:10.1016/0378-1127(92)90005-t

Cited by 67 publications

(51 citation statements)

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“…Like previous studies, our findings suggest that simulated herbivory provides a useful a priori basis for acquiring fundamental insights on the effects of insect defoliation (e.g. Eucalyptus regnans F. Muell, Candy et al, 1992). Simulating herbivory may facilitate the modelling of growth responses (Watt et al, 2007) and help the development of sophisticated tools for biological control (Conrad and Dhileepan, 2007).…”

Section: Discussionsupporting

confidence: 74%

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

et al. 2010

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Abstract• Artificial defoliation is often used to simulate defoliation by herbivory and is usually considered a good indication of a plant's response to a given type of damage. However, the findings of studies directly comparing the two defoliation types are inconsistent.• Here, the short term effects of artificial and insect defoliation by larvae of Paropsisterna agricola on growth, biomass allocation and photosynthetic capacity of Eucalyptus globulus seedlings were compared in a glasshouse experiment. The artificial defoliation was carried out to closely resemble the spatial patterns observed for insect defoliation.• Height and diameter increments were reduced as a result of insect defoliation, whereas artificial defoliation had no significant effect on height. Increased photosynthetic capacity was observed in response to both treatments, but the magnitude of this increase was larger in insect-than in artificially-defoliated seedlings. Significant reductions in foliar carbohydrate content and total biomass were noticeable in artificially-defoliated seedlings. Although the foliar carbohydrate levels also decreased across the crown zones following insect defoliation treatment, seedlings allocated a large amount of their biomass in the branches of the damaged zone.• Despite our best endeavours to simulate insect defoliation in the artificial treatment, the latter may not reflect accurately the full strength of the effects. However, artificial and insect defoliation were similar in their direction of the responses they caused in E. globulus seedlings. Mots-clés :Paropsisterna agricola / croissance / allocation de la biomasse / capacité de la photosynthèse / glucides Résumé -Les défoliations artificielle et naturelle ont-elles des effets similaires sur la physiologie de jeune plants d'Eucalyptus globulus Labill. ?• La défoliation artificielle est couramment employée pour simuler la défoliation par les insectes herbivores et elle est généralement considérée comme un bon indicateur de la réponse des plantes pour un type de dommage donné. Cependant, les résultats d'études comparant directement les deux types de défoliation sont inconsistants.• Ici, les effets court terme des défoliations artificielles et naturelles par la larve de Paropsisterna agricola ont été comparés au plan de la croissance, de l'allocation de la biomasse et de la capacité de photosynthèse dans une expérimentation conduite en serre. La défoliation artificielle a été menée pour ressembler étroitement aux modèles spatiaux observés avec la défoliation par les insectes.• À la suite de la défoliation par les insectes, les accroissements en hauteur et en diamètre ont été ré-duits, alors que la défoliation artificielle n'a eu aucun effet significatif sur la hauteur. L'augmentation de la capacité de photosynthèse a été observée en réponses aux deux traitements, mais l'ampleur de cette augmentation a été plus forte pour les plants défoliés par les insectes que pour les plants artificiellement défoliés. Des réductions significatives de la teneur foliaire en...

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Section: Discussionsupporting

confidence: 74%

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

et al. 2010

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“…It is well established that defoliation from herbivores can reduce growth of affected plants (Kulman, 1971;Alderfer and Eagles, 1976;Bassman and Dickmann, 1982;Candy et al, 1992;Reich et al, 1993;Elek et al, 2001;Collett and Neumann, 2002;Straw et al, 2002;Cerasoli et al, 2004;Wills et al, 2004). In Eucalyptus globulus plantations, several studies have suggested that removal of more than 20% of leaf area can result in long-term changes in stem growth (Rapley, 2005;Smith, 2005), although this is likely to be influenced by pattern and frequency of defoliation (Pinkard, 2003;Wills et al, 2004).…”

Section: Introductionmentioning

confidence: 95%

Growth responses of Eucalyptus globulus Labill. to nitrogen application and severity, pattern and frequency of artificial defoliation

Pinkard

Baillie

Patel

et al. 2006

Forest Ecology and Management

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“…In E. globulus this is up to age 4-5 years. However eucalypts are susceptible to defoliation from a range of pests throughout their lifecycle, and severe levels of defoliation have been observed in later-age stands [7]. If changing climate results in increased activity of defoliating pests during other stages of plantation development, then our predictions of the impacts of defoliation on biomass C sequestration will be underestimates.…”

Section: Defoliation Reduced Biomass C Sequestrationmentioning

confidence: 75%

“…Because of this complexity, studies of the impacts of pest attack on the productivity and C stores of managed forests are rare, with studies often short term in nature [7][8][9][10][11][12][13][14], and not extending to at-harvest consequences. Where modelling has been used to examine impact, results suggest large variation in impact related to the forest management strategies imposed [15] or variation in site conditions [16].…”

Section: Introductionmentioning

confidence: 99%

Vulnerability of Plantation Carbon Stocks to Defoliation under Current and Future Climates

Pinkard

Paul

Bruce

2014

Forests

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Plantation species globally are susceptible to a range of defoliating pests, but pest damage is rarely considered when estimating biomass C sequestered by these forests. We examined the impacts of defoliation on Eucalyptus globulus plantation C stocks under current and future climates using Mycospharella Leaf Disease (MLD) as a case study, hypothesising that biomass C sequestered in plantations would decrease with a warming and drying climate, and that impacts of defoliation would be strongly site dependent. Six E. globulus plantation sites with varying productivity were selected for the study. Current (1961Current ( -2005 and future (2030 and 2070) severity and frequency of MLD were estimated for each site using the bioclimatic niche model CLIMEX, and used as inputs to the process-based forest productivity model CABALA. CABALA was used to develop annual estimates of total living and dead biomass for current, 2030 and 2070 climate scenarios. Averaged annual biomass outputs were used to initialise the carbon accounting model FullCAM for calculation of C sequestered in living and dead biomass over a growing cycle. E. globulus plantations were predicted to sequester between 4.8 and 13.4 Mg C·ha over 10 years under current climatic conditions. While our estimates suggest that overall this is likely to increase slightly under future climates (up to a maximum of 17.2 Mg C·ha in 2030, and a shift in minimum and maximum values to 7.6 and 17.6 respectively in 2070), we predict considerable between-site variation. Our results suggest that biomass C sequestration will not necessarily be enhanced by future climatic conditions in all locations. We predict that biomass C sequestration may be OPEN ACCESSForests 2014, 5 1225 reduced considerably by defoliation meaning that any gains in C sequestration associated with changing climate may be substantially offset by defoliation. While defoliation has a generally small impact under current climatic conditions in these plantations, the impact is likely to increase in the future, with reductions of up to 40% predicted for some sites under future climates. We conclude that the combined impacts of climate change on pest frequency and severity, and on host responses to defoliation, may reduce biomass C sequestration in E. globulus plantations in the future.

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Modelling the impact of defoliation by the leaf beetle, Chrysophtharta bimaculata (Coleoptera: Chrysomelidae), on height growth of Eucalyptus regnans

Cited by 67 publications

References 4 publications

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

Growth responses of Eucalyptus globulus Labill. to nitrogen application and severity, pattern and frequency of artificial defoliation

Vulnerability of Plantation Carbon Stocks to Defoliation under Current and Future Climates

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