Estimates of phoretic mite abundance on bark beetles as affected by beetle capture method: a case study with Mesostigmat
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Estimates of phoretic mite abundance on bark beetles as affected by beetle capture method: a case study with Mesostigmata mites and Ips typographus (Coleoptera: Curculionidae) Jaroslav Holuša1 · Martin Čejka1 Received: 17 September 2014 / Accepted: 15 October 2020 © Springer Nature Switzerland AG 2020
Abstract The spectrum of Mesostigmata mite species that are phoretic on the bark beetle Ips typographus has been well described. However, phoretic mite abundance has mostly been quantified by researchers who used only a single method for capturing bark beetles: pheromone traps. We therefore compared mite abundance using two beetle-capture methods. At a single location with high numbers of I. typographus in the eastern Czech Republic in 2013, beetles were collected with pheromone traps and from infested logs placed in emergence traps. In total 29,589 I. typographus beetles were captured using the two methods. Mite abundance was assessed on 2400 beetles from pheromone traps and on 955 beetles from emergence traps; in total 5805 phoretic mesostigmatid mites were detected. Six species of phoretic mites were captured using pheromone traps and four species using emergence traps. The number of phoretic mites per beetle was higher for beetles captured in emergence traps than for beetles captured in pheromone traps. The most abundant mite species overall were Dendrolaelaps quadrisetus, Uroobovella ipidis, and Trichouropoda polytricha. The seasonal dynamics of phoretic mites paralleled the seasonal dynamics of their hosts. Keywords Emergence traps · Dendrolaelaps quadrisetus · Pheromone traps · Phoresy · Picea abies · Trichouropoda · Seasonal dynamics · Uroobovella
Introduction The bark beetle Ips typographus is considered an important component in all Eurasian spruce forests. Although I. typographus colonizes dying and newly dead trees and initiates the decomposition of bark and wood (Müller et al. 2008), it often attacks stressed trees (Rouault et al. 2006), and is therefore one of the most significant pests of Norway
* Jaroslav Holuša [email protected] 1
Department of Forest Protection and Entomology, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, 165 21 Prague 6 Kamycka, 1176 Suchdol, Czech Republic
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Vol.:(0123456789)
Experimental and Applied Acarology
spruce in Eurasia (Schroeder 2001). Because I. typographus and other bark beetles are economically important, their natural enemies have been studied intensively (e.g., Kenis et al. 2004; Vanická et al. 2020). Bark beetles are attacked by a variety of natural enemies including mites (Wermelinger 2004; Wegensteiner 2004; Kenis et al. 2004). A mite species may be phoretic on one bark beetle life stage and predaceous or parasitic on other life stages. Some mite species may even prey on beetle eggs or larvae in bark beetle galleries (Kiełczewski and Bałazy 1966; Kinn 1971; Hofstetter et al. 2006). In addition to being attacked by mites, bark beetles may also be attacked by wasps, beetles, flies, ants, fungi, birds, shrews, and en
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