Region-wide mass mortality of Japanese oak due to ambrosia beetle infestation: Mortality factors and change in oak abundance

Nakajima, Haruki

doi:10.1016/j.foreco.2019.117468

Cited by 8 publications

(5 citation statements)

References 75 publications

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“…This host preference can be attributed at least partially to climate change because ambrosia beetles prefer to attack weakened or stressed trees [8]. This explanation is consistent with the pattern of JOW in Japan, for which tree mortality is high at lower elevations and extremely low at higher, colder sites (>1000 m) [28].…”

Section: Causes Of Kowsupporting

confidence: 75%

“…Interestingly, the density of the beetle's entrance holes increased with high dominance of the Quercus species [16], suggesting that the probability of KOW increases with available resources of the beetle vector. Similarly, the occurrence of JOW was concentrated in stands with high volumes of Q. crispula, a major host of JOW [28]. ease cycle and management of KOW [20].…”

Section: Host and Symptommentioning

confidence: 99%

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Oak Decline Syndrome in Korean Forests: History, Biology, and Prospects for Korean Oak Wilt

Choi

Lee

Jung

et al. 2022

Forests

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Oak decline syndrome has been observed in South Korea and Japan and variously referred to as Korean oak wilt (KOW) and Japanese oak wilt (JOW). We reviewed aspects of the historical occurrence of KOW, disease cycle, and its potential causes. KOW has been seen principally in Mongolian oak (Quercus mongolica Fisch. ex Ledeb.). The first occurrence of KOW was in 2004 in Seongnam, South Korea. KOW is associated with the fungus Raffaelea quercus-mongolicae, which is vectored by the ambrosia beetle Platypus koryoensis. In addition, it has been suggested that yeasts have evolved a symbiotic relationship with the vector without antagonism for the pathogenic fungus. The number of trees in Korea killed by KOW increased to about 331,000 in 2011, but then decreased to about 157,000 in 2019. We hypothesized that trees infected by R. quercus-mongolicae accumulate phenolic compounds in the sapwood and the vector (P. koryoensis) beetles then avoid these trees. Therefore, the number of hosts available for the beetle after a KOW outbreak decrease due to accumulation of phenolic compounds in the wood, although most oak trees survive outbreaks. Therefore, P. koryoensis beetles move longer distances after outbreaks to find susceptible host trees. Novel occurrence of KOW in Korea may be due to either (1) an increase in tree age (size) in Korean oak stands, for which the beetle has a known preference or (2) climate change, which may be increasing the number of weakened or stressed trees, for which P. koryoensis also shows a preference.

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Section: Causes Of Kowsupporting

confidence: 75%

Section: Host and Symptommentioning

confidence: 99%

Oak Decline Syndrome in Korean Forests: History, Biology, and Prospects for Korean Oak Wilt

Choi

Lee

Jung

et al. 2022

Forests

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“…Loss of forest resilience to climatic stressors may also occur if anthropogenic land-use legacies affect interspecific interactions such as mutualisms (Table 1) [48, [62][63][64]. Species replacements may also lead to increased performance of antagonists under changing climatic conditions, including tree heterospecific competitors, invasive species, herbivores, and pathogens (Table 1) [42,54,[65][66][67][68][69][70][71][72][73].…”

Section: Forest Composition: Shifts In Functional Traits Genetics And...mentioning

confidence: 99%

“…This alteration may reduce the capacity of trees to cope with drought stress [48, 63,64]. High occurrence of tree stumps or increased stand density and structural homogeneity may alter interspecific interactions and favour, for instance, the spread of pathogen and insect outbreaks [65,70,73] that in interaction with climate-related stress may exacerbate negative impacts on forests [42,72].…”

Section: A Risk-based Framework Using the Concept Of Anthropogenic La...mentioning

confidence: 99%

Anthropogenic land-use legacies underpin climate change-related risks to forest ecosystems

Vilà‐Cabrera

Astigarraga

Jump

et al. 2023

Trends in Plant Science

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“…The stem dynamics of adult trees in JOW-affected forests have been extensively studied (Saito & Shibata, 2012;Nakajima & Ishida, 2014;Watanabe et al, 2016;Hata et al, 2017). Nakajima (2019) reported that mortality rates during the JOW epidemic for Quercus crispula and Q.serrata were 68% and 21%, respectively. Saito and Shibata (2012) found that Q. crispula had extremely high mortality (90%-100%) in a JOWafflicted forest.…”

Section: Introductionmentioning

confidence: 99%

Factors affecting seedling establishment in a warm-temperate secondary forest affected by oak wilt disease

Watanabe,

Otani

et al. 2024

Preprint

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Diseases are major natural disturbances to forest ecosystems that cause changes to overstory tree structure and influence seedling dynamics by altering environmental conditions via functional traits. Thus, identifying the factors affecting seedling dynamics would improve the broader understanding of the seedling regeneration process after disease disturbance. We investigated 13,010 current year seedlings from 59 woody species, 44 genera, and 21 families following Japanese oak wilt disease (JOW) in 2009–2013 and 2018–2020 in a Japanese warm-temperate secondary forest. We also quantified temporal changes in canopy openness and soil moisture. Structural equation model (SEM) was used to explore the effects of environmental conditions and seedling functional traits on current year seedling density in autumn. Canopy openness gradually increased, whereas soil water content decreased throughout the study site. After 3‒5 years of disruption by JOW, the recruitment of current year seedlings increased through improvements in light conditions. The recruitment of non-current year seedlings increased after the improvement of current year seedling emergence. The functional traits of current year seedlings were likely to be affected by soil nutrients in the late JOW period, whereas litterfall production influenced the functional traits of current year seedlings in the post-JOW period. Factors affecting seedling density varied as environmental conditions changed across the JOW periods. Seedling establishment was enhanced by increased canopy openness in the late JOW period and by low litterfall, high soil nutrient content, and high soil moisture in the post-JOW period. The lack of any direct effect of seedling functional traits on seedling density might be associated with extensive changes in abiotic conditions caused by JOW disturbance. Our study provides evidence that the temporal changes in environmental conditions and seedling densities occurring after disruption by JOW differed from the changes in forests impacted by other natural disturbances.

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Region-wide mass mortality of Japanese oak due to ambrosia beetle infestation: Mortality factors and change in oak abundance

Cited by 8 publications

References 75 publications

Oak Decline Syndrome in Korean Forests: History, Biology, and Prospects for Korean Oak Wilt

Oak Decline Syndrome in Korean Forests: History, Biology, and Prospects for Korean Oak Wilt

Anthropogenic land-use legacies underpin climate change-related risks to forest ecosystems

Factors affecting seedling establishment in a warm-temperate secondary forest affected by oak wilt disease

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