Forest health in a changing world: effects of globalization and climate change on forest insect and pathogen impacts

Ramsfield, Tod D.; Bentz, Barbara; Faccoli, Massimo; Jactel, Hervé; Brockerhoff, Eckehard G.

doi:10.1093/forestry/cpw018

Cited by 212 publications

(147 citation statements)

References 65 publications

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“…These results have an impact in the context of biological invasions, taking into account that numerous exotic pest and pathogen introductions have led to significant ecological and/or economic damage (Hulme 2009;Ramsfield et al 2016). Wood-infesting pests can negatively impact forest productivity, wood quality and forest ecosystem dynamics (Dreistadt et al 1990;Liebhold et al 1995;Boyd et al 2013;Charles et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Metagenomic approach of associated fungi with <i>Megaplatypus mutatus</i> (Coleoptera: Platypodinae)

Ceriani-Nakamurakare¹,

Ramos²,

Robles³

et al. 2018

Silva Fenn.

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Highlights• There were no significant effects of host plant and location on fungal richness.• Two fungal species, belonging to Fusarium and Candida genera, were present in all the studied associations.• Results suggest that host plant identity would not be crucial to determine the composition of fungal communities associated to Megaplatypus mutatus. AbstractMegaplatypus mutatus is a major forest pest in Argentina and an emerging pest in Europe. In this study the multitrophic interactions between M. mutatus and associated fungi were assessed with a metagenomics approach (454-pyrosequencing). A total of 270 collection points from insect galleries from three locations in Argentina were pooled for pyrosequencing analyses. Two hosts, Populus deltoides and Casuarina cunninghamiana, were independently evaluated to characterize the fungal communities associated to M. mutatus; compare the culture-independent approach with previous culturing studies, in terms of data recovery related to the fungal community composition, and test the specificity of the fungal communities amongst locations and hosts. A Generalized Linear Mixed Model was performed to compare the fungal richness in each dataset, which showed no significant differences between taxa richness amongst locations. Principal Coordinates Analyses showed a separation between fungal communities within the same host, suggesting that host identity would not be crucial to determine the specificity in fungal communities. Candida insectalens and one Fusarium species, present in all hosts and locations, achieved 37.6% of the total relative frequency per taxa. These results complement the data from culturing methods previously reported, thus improving the accuracy and understanding of the fungal assemblages associated to M. mutatus.

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Section: Discussionmentioning

confidence: 99%

Metagenomic approach of associated fungi with <i>Megaplatypus mutatus</i> (Coleoptera: Platypodinae)

Ceriani-Nakamurakare¹,

Ramos²,

Robles³

et al. 2018

Silva Fenn.

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“…Changes in host phenology may result in desynchronization of host and pathogen and thus reduce or enhance the impact of pathogens (Baltensweiler , Ramsfield et al. ). The phenology of Douglas‐fir is well studied, and models can provide relatively accurate estimates of growth initiation and cessation based on variables such as forcing and chilling hours (Campbell and Sorensen , Harrington et al.…”

Section: Discussionmentioning

confidence: 99%

Climate of seed source affects susceptibility of coastal Douglas‐fir to foliage diseases

et al. 2017

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Abstract. Seed-source movement trials using common garden experiments are needed to understand climate, tree (host), and pathogen interactions. Douglas-fir (Pseudotsuga menziesii var menziesii) is an important tree species native to western North America influenced by the foliar fungi Phaeocryptopus gaeumannii, a biotroph and causal agent of Swiss needle cast (SNC), and Rhabdocline species, necrotrophs that cause Rhabdocline needle cast. We used the Douglas-fir Seed-Source Movement Trial, a large provenance study of Douglas-fir that consists of populations and test sites chosen to represent the range of climate conditions experienced by Douglas-fir west of the Cascade and northern Sierra Nevada Mountains, USA, to assess disease severity and symptom expression in Douglas-fir in relation to climatic differences between test sites and population sources. Using generalized linear mixed models, probability of disease severity/expression was modeled with respect to the climate variables May through September precipitation (MSP), mean winter temperature (MWT), and continentality. Stark differences in disease expression were observed in trees from different regions, especially in relation to resistance to Rhabdocline spp. and tolerance to P. gaeumannii. There were no major differences across seed-source regions at any particular site in infection levels of P. gaeumannii assessed by fruiting body abundance, yet disease tolerance followed similar geographic patterns as resistance to Rhabdocline spp. Transfers of populations from low to high MSP, and/or cool to warm MWT, increased the probability of moderate to severe Rhabdocline spp. infection and SNC disease symptoms. Our results suggest that local seed sources are adapted to local climate and pathogen pressures and that seed sources from regions with high foliage disease pressure are most resistant/tolerant to those foliage diseases. We also confirm that temperature and precipitation are important epidemiological factors in forest disease and that assisted migration must take into account trophic interactions of trees. Movement of seed sources from dry spring and summer and/or cool winter conditions to mild, mesic environments is likely to lead to increased probability of losses due to these foliage diseases.

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“…Temperatures in the past fifty years, however, have increased by more than 2 • C and no obvious change in the tree growth-climate relationship was found. On the other hand, tree growth was also influenced by other factors such as disturbances and insects [4,5]. There could be substantial error if tree growth was controlled by other factors.…”

Section: Discussionmentioning

confidence: 99%

“…Changing climate conditions are significantly influencing forest growth and dynamics through longer growing seasons, shifts of insect species ranges, and changed frequency of forest fires [3][4][5][6][7][8]. Relationships between climate variables and radial tree growth have allowed for the robust reconstruction of past climate conditions on timescales that are not observationally possible.…”

Section: Introductionmentioning

confidence: 99%

Climate-Induced Tree Growth Variations under the RCP 2.6 Scenario: A Case Study on the Southeastern Tibetan Plateau

Zhang

Zou

Chen

2017

Forests

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Abstract:The relationship between climate and radial tree growth is traditionally used to reconstruct past climate conditions based on interannual tree-ring variations. However, few studies have used these climate-growth relationships to model the radial tree growth based on future climate projections. To detect the future forest dynamics, the climate-induced tree growth from 2006 to 2100 was projected using temperature changes under representative concentration pathway (RCP) 2.6 for the southeastern Tibetan Plateau. Radial tree growth was mainly controlled by annual mean temperature in this region. Based on the relationship between regional annual mean temperature and radial tree growth, a regression model was built that explained 62.5% of variance in the observed temperature record over the period . A period of unprecedented radial tree growth was found after 1998 when compared with the tree growth in the past 700 years. We found that radial tree growth would increase in the period 2006-2045 and decline after that period due to the projected temperature decrease. As forest productivity and biomass are expected to increase with the increased tree growth, these results suggest that temperature-limited systems could see future increases in productivity as growth limitations are lessened. The results of this research could be used to predict regional forest dynamics in the future.

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Forest health in a changing world: effects of globalization and climate change on forest insect and pathogen impacts

Cited by 212 publications

References 65 publications

Metagenomic approach of associated fungi with <i>Megaplatypus mutatus</i> (Coleoptera: Platypodinae)

Metagenomic approach of associated fungi with <i>Megaplatypus mutatus</i> (Coleoptera: Platypodinae)

Climate of seed source affects susceptibility of coastal Douglas‐fir to foliage diseases

Climate-Induced Tree Growth Variations under the RCP 2.6 Scenario: A Case Study on the Southeastern Tibetan Plateau

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