Seasonal Dynamics of Mites and Fungi and Their Interaction with Southern Pine Beetle

Hofstetter, Richard W.; Klepzig, Kier D.; Moser, John C.; Ayres, Matthew P.

doi:10.1603/0046-225x-35.1.22

Cited by 48 publications

(26 citation statements)

References 44 publications

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“…Therefore, few studies have attempted to describe how these interactions can influence beetle populations [38,67,68]. Understanding which organisms are involved in these interactions and their potential contributions is fundamental to pursue complex questions about their effects on irruptive Dendroctonus population trends.…”

Section: Discussionmentioning

confidence: 99%

“…We do not know whether their distribution within MPB populations is geographically and temporally stable or if it changes between tree host species or between population stages. In the southern pine beetle, mite frequencies respond to thermal changes within a single season [38]. It is possible that populations of fungus-feeding mite species are associated with the MPB change between tree species since a tree's chemical and ecological differences could affect the frequency of their phoretic fungi or affect mites directly.…”

Section: Introductionmentioning

confidence: 99%

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Fungal Frequency and Mite Load Trends Interact with a Declining Mountain Pine Beetle Population

Mercado

Ortiz-Santana

Kay

2018

Forests

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Abstract:The mite and fungal biota associated with the mountain pine beetle (MPB) (Dendroctonus ponderosae Hopk.) may not be stable throughout an irruptive event. In congeneric beetles, variations in the frequency of their associated organisms affect population trends and similar effects may occur in MPB. We studied fungi and mite trends in a declining irruptive MPB population as it attacked three different pine hosts in the Colorado Front Range. During the study, we found two new associates including one biologically relevant mite and one beneficial blue-stain fungus. Fungi hyperphoretic on mites were also documented. This included beneficial and potentially detrimental species to the MPB. The frequency of several organisms varied between some years or pine hosts but not within male or female beetles. A large increase of Trichouropoda sp. and T. ips mites trended inversely with the declining beetle population, while a decrease in the beneficial blue-stain fungi trended similarly to the declining beetle population. We discuss the interactions and potential effects of phoretic biota in relation to (1) the MPB associates' population trends, (2) the MPB incursions into cooler areas, and (3) the redundancy of blue-stain fungi carried by the MPB holobiont. These findings increase our knowledge of the mechanisms that influence MPB populations.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fungal Frequency and Mite Load Trends Interact with a Declining Mountain Pine Beetle Population

Mercado

Ortiz-Santana

Kay

2018

Forests

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“…While the general membership of the symbiont community associated with a host may remain constant, or nearly so, the relative prevalence of each symbiont may vary considerably over time and within and among locations (39,44,90,104). This variability is due primarily to differences in the tolerances of the fungi to various environmental conditions.…”

Section: Bark Beetle-fungus Symbiosesmentioning

confidence: 99%

The Role of Phytopathogenicity in Bark Beetle–Fungus Symbioses: A Challenge to the Classic Paradigm

Six

Wingfield

2011

Annu. Rev. Entomol.

257

211

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The idea that phytopathogenic fungi associated with tree-killing bark beetles are critical for overwhelming tree defenses and incurring host tree mortality, herein called the classic paradigm (CP), has driven research on bark beetle-fungus symbiosis for decades. It has also strongly influenced our views of bark beetle ecology. We discuss fundamental flaws in the CP, including the lack of consistency of virulent fungal associates with tree-killing bark beetles, the lack of correspondence between fungal growth in the host tree and the development of symptoms associated with a successful attack, and the ubiquity of similar associations of fungi with bark beetles that do not kill trees. We suggest that, rather than playing a supporting role for the host beetle (tree killing), phytopathogenicity performs an important role for the fungi. In particular, phytopathogenicity may mediate competitive interactions among fungi and support survival and efficient resource capture in living, defensive trees.

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“…Mite's abundance was strongly correlated with O. minus and was an important driving force in promoting bluestain prevalence within trees (Lombardero et al, 2003). Spring abundances of mites and the prevalence of O. minus during D. frontalis infestation were strong predictors of beetle population decline (Hofstetter et al, 2006a(Hofstetter et al, , 2006b. Further studies on the interactions of O. minus with other insect or fungi associated to Pinus pinaster decline should be performed to establish their influence on the disease.…”

Section: Speciesmentioning

confidence: 99%

Ophiostomatoid fungi associated with declined Pinus pinaster stands in Spain

Álvarez

Fernández

2015

For. syst.

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Aim of study: We studied the presence of fungi and distribution patterns in relation to the health status of declining Pinus pinaster trees.Area of study: Trees in two declining stands in Central Spain were allotted to three declining classes...Material and Methods: Trees in two declining stands in Central Spain were allotted to three declining classes (healthy, declining and recently dead) and 3 trees of each class were felled in each stand. Wood slides (phloem and xylem) were taken at six positions along the trees and samples collected from fungal identification.Main results: A total of 21 fungal taxa were isolated and identified; eleven of these species belonged to the Ophiostomatoid group. Ophiostoma minus was the most frequently isolated fungus and was identified in 22% of the samples, mainly associated to dead and diseased trees.Research highlights: Together these results suggest a putative association of O. minor with the decline in this area, and thus we suggest paying more attention to this fungus as a potential agent of decline in P. pinaster stands.Key words: Ophiostomatoid fungi; forest pathology; bluestain fungi; multivariate analyses.Abbreviations: UTM: Universal Transverse Mercator coordinate system; MEA: Malt Extract Agar; DNA: Deoxyribonucleid acid; ITS: Internal Transcribed Spacer; BLAST: Basic Local Alignment Search Tool; CCA: Canonical Correspondence Analyses; PWN: Pine Wood Nematode.

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Seasonal Dynamics of Mites and Fungi and Their Interaction with Southern Pine Beetle

Cited by 48 publications

References 44 publications

Fungal Frequency and Mite Load Trends Interact with a Declining Mountain Pine Beetle Population

Fungal Frequency and Mite Load Trends Interact with a Declining Mountain Pine Beetle Population

The Role of Phytopathogenicity in Bark Beetle–Fungus Symbioses: A Challenge to the Classic Paradigm

Ophiostomatoid fungi associated with declined Pinus pinaster stands in Spain

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