Fecundity of the Southern Pine Beetle1,2 in Laboratory Pine Bolts

Clarke, Alice L.; Webb, John W.; Franklin, Rudolph T.

doi:10.1093/aesa/72.2.229

Cited by 25 publications

(24 citation statements)

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“…3a, b) implying that net reproductive costs and benefits tended to equalise fitness differences between the two groups. There was a high positive correlation between gallery length excavated per day, and number of offspring produced per day, confirming the findings of Clarke et al (1979) that the ability to excavate galleries quickly is an important component of fitness in D. frontalis. Beetles that arrived in the middle of the sequence achieved the highest fitness of the four categories.…”

Section: Timing Of Attack Beetle Size and Pheromone Productionsupporting

confidence: 81%

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Fitness consequences of pheromone production and host selection strategies in a tree-killing bark beetle (Coleoptera: Curculionidae: Scolytinae)

2006

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Timing of arrival at a resource often determines an individual's reproductive success. Tree-killing bark beetles can reproduce in healthy trees by attacking in adequate numbers to overcome host defences that could otherwise be lethal. This process is mediated by aggregation and antiaggregation pheromones. Beetles that arrive early in such a "mass attack" must contend with undiminished tree defences, and produce enough pheromones to attract more beetles, but have a head start on gallery construction and egg-laying. Beetles that arrive late may be impeded by competition and diminishing availability of phloem, but should experience fewer costs associated with pheromone production and battling tree defences. We investigated relationships between timing of arrival, body size, pheromone production and fitness in the southern pine beetle, Dendroctonus frontalis. In field experiments, we captured beetles that arrived early (pioneers) and late on slash pine trees, Pinus elliottii, and measured pheromone amounts in their hindguts. We marked gallery entrances of beetles as they landed on a tree and measured their reproductive success after the attack terminated. We found no difference in body size or pheromone amounts between early and late arrivers. Most beetles arrived at the middle of the attack sequence, and excavated longer galleries per day than early arrivers. The number of offspring produced per day by beetles that established galleries midway through mass attack was higher than those that arrived early or very late in the sequence. Our results suggest that beetles do not exhibit adaptive phenotypic plasticity in pre-landing pheromone production, depending on the extent of previous colonisation of a host. Rather, it appears that stabilising selection favours beetles that attack in the middle of the sequence, and contributes to attack synchrony. Synchronous attack on trees is essential before population booms characteristic of tree-killing bark beetles can occur in nature.

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Section: Timing Of Attack Beetle Size and Pheromone Productionsupporting

confidence: 81%

“…Large beetles can fly further, sire more offspring (Reid and Roitberg 1995;Robertson and Roitberg 1998), lay more eggs (Reid 1962;McGhehey 1971;Clarke et al 1979), survive harsh environmental conditions better (Safranyik 1976) and produce more pheromones (Pureswaran and Borden 2003) than small ones.…”

Section: Introductionmentioning

confidence: 99%

Fitness consequences of pheromone production and host selection strategies in a tree-killing bark beetle (Coleoptera: Curculionidae: Scolytinae)

2006

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“…The superior nutrition in galls may enhance larval survival. In many insect species, including beetles, greater size has been positively correlated with other fitness measures such as fecundity, egg size, offspring size, dispersal ability, and resistance to starvation (Price and Willson 1976;Scheiring 1977;Davis 1984;Clarke et al 1979;Palmer 1985).…”

Section: Host-related Trait Differencesmentioning

confidence: 99%

Cryptic Speciation and Host-Race Formation in a Purportedly Generalist Tumbling Flower Beetle

et al. 2005

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Host-race formation remains controversial as a source of herbivorous insect diversity, and examples of host races are still fairly scarce. In this study, analysis of five enzyme loci in the ostensibly generalist tumbling flower beetle Mordellistena convicta (Coleoptera: Mordellidae) revealed hidden host-plant and plant-organ related genetic differentiation. Mordellistena convicta turned out to be a complex of cryptomorphic species, each with fewer hosts than the nominal species. These cryptic species, in turn, were divided into taxa that showed host-race characteristics: samples from different host plants and organs exhibited (1) genetic indications of partial reproductive isolation, (2) differences in size and emergence timing that suggested divergent host-related selection, and (3) among-host selective differences in mortality from parasitoids. Host-race formation in M. convicta, which has a somewhat different life history from the well-studied host races, enlarges the group of insects considered likely to undergo this process. The widespread sympatry of the M. convicta species complex, along with its spectrum of host-correlated genetic differentiation, suggests that these host specialist taxa developed in sympatry.

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“…the tree-killing species of the genera Ips and Dendroctonus), body size is associated with overall fitness. The larger individuals of these species exhibit greater fat reserves (Atkins 1967;Thompson, Bennett 1971), higher dispersal capability (Robertson, Roitberg 1998), higher pheromone production (Pureswan, Borden 2003), and higher survival rates during extreme temperatures (Safranyik 1976), and they lay more eggs (Clarke et al 1979). Accordingly, in the present study, larger females of S. koenigi were found to lay more eggs, corresponding to the greater numbers of larval galleries emerging from the wider egg galleries (see Results).…”

Section: Discussionmentioning

confidence: 99%

Scolytus koenigi Schevyrew, 1890 (Coleoptera: Curculionidae): new bark beetle for the Czech Republic and notes on its biology

Kašák¹,

Foit²,

Holuša³

et al. 2015

J. For. Sci.

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ABSTRACT:In November 2013, Scolytus koenigi Schevyrew, 1890 was recorded for the first time in the territory of the Czech Republic (Southern Moravia, at two localities near the village of Lednice). This finding represents the northernmost occurrence of this species in Central Europe. Because the knowledge of the S. koenigi bionomy is very limited, the characteristics of 52 galleries on 10 different host tree fragments were studied. The species was found to develop on dead or dying branches and thin trunks of maples Acer campestre L. and Acer platanoides L. with diameters of 3-12 cm. All of the galleries comprised a 1.6-2.9 mm wide and 8-67 mm long single egg gallery oriented parallelly to the wood grain, with 18-108 larval galleries emerging almost symmetrically on both sides of the egg gallery.

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Fecundity of the Southern Pine Beetle1,2 in Laboratory Pine Bolts

Cited by 25 publications

References 0 publications

Fitness consequences of pheromone production and host selection strategies in a tree-killing bark beetle (Coleoptera: Curculionidae: Scolytinae)

Fitness consequences of pheromone production and host selection strategies in a tree-killing bark beetle (Coleoptera: Curculionidae: Scolytinae)

Cryptic Speciation and Host-Race Formation in a Purportedly Generalist Tumbling Flower Beetle

Scolytus koenigi Schevyrew, 1890 (Coleoptera: Curculionidae): new bark beetle for the Czech Republic and notes on its biology

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