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Fire and Bark Beetle Interactions Species of Suitable Size

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Fire and Bark Beetle Interactions Species of Suitable Size F of fire-bark beetle interactions exist with more Fire and Bark Beetle detailed information (Hicke et al. 2012; Jenkins Interactions et al. 2008, 2012, 2014; Kane et al. 2017). A basic background of bark beetle biology is Sharon M. Hood necessary to understand fire-bark beetle interac- Rocky Mountain Research Station, USDA Forest tions. Numerous bark beetles (Coleoptera: Cur- Service, Missoula, MT, USA culionidae, Scolytinae) species are native insects to North America that are capable of irrupting in population to kill mature trees (Wood 1982). Host Synonyms tree species is specific to the bark beetle species. Bark beetles require living phloem to success- Fire and insect interactions fully reproduce; therefore, they only attack live trees. Life cycle varies by geographic region and bark beetle species, but generally, beetles com- Definition municate via pheromones to mass attack a live tree by boring through the bark on the tree’s main Interactions between wildland fire and bark bee- stem. The coordinated mass attack overwhelms a tles such that one disturbance impacts the other tree’s defenses to allow mating and reproducing (Raffa and Berryman 1983). Females construct galleries in the phloem and deposit eggs. As eggs Introduction develop into larvae and then pupae, they feed on phloem. When mature, the new generation of Wildland fire and bark beetle outbreaks are both beetles bore out of the tree through the bark to large disturbances in North American forests with attack other trees. the potential to interact over spatial and temporal scales (Hicke et al. 2016; Raffa et al. 2008). The Fire Before Bark Beetles order of the disturbances, fire before bark beetles Fire severity, bark beetle populations, and forest or fire after bark beetles, influences the outcome structure and composition determine if a burn of the interaction. Fire and bark beetles are sim- area is susceptible to bark beetles (Fettig et al. ilar in that both can cause massive amounts of 2014;Parkeretal.2006). If an area burns tree mortality, alter nutrient cycling, and alter for- intensely and kills most trees (i.e., high severity), est structure and species composition, but these then there is not suitable host material for disturbances, in isolation and together, also have bark beetles. The fire must also be within a distinct effects on ecosystems. Several reviews bark beetle’s dispersal range and contain host © Springer Nature Switzerland AG 2020 S. L. Manzello (ed.), Encyclopedia of Wildfires and Wildland-Urban Interface (WUI) Fires, https://doi.org/10.1007/978-3-319-51727-8_251-1 2 Fire and Bark Beetle Interactions species of suitable size. If these conditions are Fire After Bark Beetles met, then bark beetles are capable of attacking Wildland fire behavior and effects after a bark trees weakened by fire that may have otherwise beetle outbreak is dependent on the outbreak survived to cause additional tree mortality. Levels severity and time since outbreak (Hicke et al. of bark beetle-caused mortality after fire also 2012). The course of an outbreak has been called vary with tree injury, postfire environment, and a “bark beetle rotation” by Jenkins et al. (2008, other factors such as beetle predation (Jenkins 2014) to describe the phases of time since attack et al. 2014). While bark beetles routinely cause and changes to tree crown condition (Fig. 1). additional tree mortality after fire, outbreaks into Attacked trees are first “green-infested,” then adjacent unburned areas are uncommon (Davis needles fade, and tree enters the “yellow” phase. et al. 2012; Lerch et al. 2016; Lombardero and In the “red” phase, the tree is dead, and needles Ayres 2011;Powelletal.2012). turn red. The final phase is the “gray” phase when Tree injury level influences bark beetle needles fall off the tree. It is important to note attraction, with moderately injured trees that during the course of an outbreak, trees are generally being more susceptible to attack (Hood attacked and killed often over a period of several and Bentz 2007; Lerch et al. 2016; McHugh et al. years, and cumulative mortality varies consider- 2003;Powelletal.2012; Santoro et al. 2001). ably by attack severity. Therefore, a forest can Red turpentine beetle (Dendroctonus valens contain trees in multiple phases of the bark beetle LeConte) attacks were positively related to bark rotation at the same time. char height in ponderosa pine (Westlind and Outbreaks alter fuel loading, arrangement, and Kelsey 2019) and correlated with increased tree moisture as bark beetle-killed trees deteriorate mortality after fire (Hood et al. 2010; Westlind and fall to the ground (Jenkins et al. 2014). and Kelsey 2019). Figure 2a from Hicke et al. (2012) describes the Fire severity influences both individual tree generalized expected change in fuels by type with physiology and stand-to-landscape-level patterns time since outbreak. The exact timing will vary of forest structure, thereby influencing forest sus- by tree species, beetle species, and geographic ceptibility to bark beetles. Low-severity fire can location. As successfully attacked trees move induce tree defenses, which increases resistance from the red to gray phase, needles and fine to bark beetles (Hood et al. 2015; Lombardero branches drop to the ground and litter, 1, and and Ayres 2011; Lombardero et al. 2006). Resin 10 h fuels increase. This causes a concomitant duct-related induced defenses take approximately decrease in canopy fuels. In the gray phase, 100 1 year after fire to form, and fire-injured trees may and 1000 h fuels gradually increase over time be more susceptible to bark beetle attacks during as the dead trees deteriorate. Increased light and this time. In this way, frequent, low-severity fire moisture availability from overstory tree mortal- in dry conifer forests may foster both high tree ity releases smaller, surviving trees that were not level defenses and forest structure that confers suitable hosts to the beetles, causing an increase resistance to subsequent bark beetle outbreaks, in ladder fuels. but there is a window of increased susceptibil- The changes to fuels from a bark beetle out- ity to beetles after fire before induced defenses break also lead to changes in forest flammability form (Hood et al. 2015, 2016). High-severity and potential fire behavior (Figure 2b;Hicke fire also reduces susceptibility to bark beetles et al. 2012; Jenkins et al. 2012). There are many by killing host tree species of sufficient size to challenges with modeling fire behavior in beetle- support a developing beetle brood. Work in sub- impacted forests, largely because fire behavior alpine forests has shown spruce beetle outbreaks model assumptions are violated (Jenkins et al. are reduced for decades after high-severity fire 2012; Page et al. 2014). These challenges and because host trees are too small to be attacked the limited ability to evaluate model predictions (Bakaj et al. 2016; Bebi et al. 2003). with empirical data (Alexander and Cruz 2013) have led to inconsistencies and debate in the Fire and Bark Beetle Interactions 3 F Fire and Bark Beetle Interactions, Fig. 1 An individual tree as it goes through the bark beetle attack phases or bark beetle rotation literature about if bark beetle-impacted forests Whether fire severity, measured as either tree increase fire behavior relative to unattacked, mortality, vegetation change, or soil heating, green forests (Jolly et al. 2012a; Simard et al. changes in beetle-impacted forests compared to 2011; 2012). Efforts using physics-based models green, unattacked forests depends on the phase suggest bark beetle-caused mortality increases of the bark beetle rotation, weather at the time fire rate of spread above unattacked forests, with of fire, and forest type. Using a physics-based spread rates peaking during the red phase, but model, Sieg et al. (2017) found fire severity remaining faster than in green forests even as (i.e., tree mortality) increased in ponderosa canopy fuels decrease (Hoffman et al. 2015). In pine-dominated (Pinus ponderosa Lawson & an experiment of needle flammability, red needles C. Lawson) beetle-impacted forests during the from attacked trees ignited faster than green red phase, but was unchanged or decreased in needles, which could lead to increased crown fire the gray phase compared to green forests. The potential (Jolly et al. 2012b). Schoennagel et al. interactions between fire and bark beetles on (2012) also show the importance of accounting resulting severity were weakened under high for reduced foliar moisture content during the wind conditions (Sieg et al. 2017). Fire severity, red phase when predicting crown fire behavior measured as change in vegetation, decreased with in beetle-impacted forests. However, once a time since mountain pine beetle (Dendroctonus crown fire is initiated, fire behavior in lodgepole ponderosae Hopkins) outbreak in Washington pine (Pinus contorta Douglas ex Loudon var. and Oregon, USA (Meigs et al. 2016). In contrast, latifolia Engelm. ex S. Watson) forests that Prichard and Kennedy (2014) also measured occurs under dry, windy weather conditions is severity by change in vegetation in Washington, likely to be similar regardless of bark beetle USA but found higher fire severity in red phase activity (Schoennagel et al. 2012). mountain pine beetle-impacted forests. Harvey et al. (2014) reported mountain pine beetle attack 4 Fire and Bark Beetle Interactions Fire and Bark Beetle snagfall Interactions, Fig. 2 a Conceptual framework of needles off regrowth/inderstory development (gray phase) (a) fuels characteristics and (old phase) (b) fire behavior relative to 100-, preoutbreak conditions for needles dry, on 1000-hour red, gray, and old (snagfall (red phase) fuels and regrowth) phases. live ladder Surface fire properties trees include reaction intensity, rate of spread, and flame litter, 1-, length. For postoutbreak 10-hour phases, solid lines indicate fuels higher confidence, and conditions (normalized) canopy dashed lines indicate lower bulk confidence (more fuels compared with preoutbreak higher confid.
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