FACTORS AFFECTING LARVAL DIAPAUSE IN <i>DENDROCTONUS RUFIPENNIS</i> (COLEOPTERA: SCOLYTIDAE)

Dyer, Ellie E.; Hall, P. M.

doi:10.4039/ent1091485-11

Cited by 21 publications

(31 citation statements)

References 4 publications

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“…Spruce beetle must diapause (overwinter once as adults) in order to reproduce, and may complete their life cycle in one, two, or possibly three years [1]. A semivoltine life cycle (one generation per two years) generally occurs at locations where relatively cool summer conditions retard larval development prior to the arrival of cold fall temperatures and beetles enter a prepupal diapause to overwinter [41]. Under warm conditions, spruce beetles may develop to pupal and adult stages by fall resulting in the univoltine (one generation per year) life cycle [41,42].…”

Section: Temperaturementioning

confidence: 99%

Spruce Beetle Biology, Ecology and Management in the Rocky Mountains: An Addendum to Spruce Beetle in the Rockies

Jenkins

Hebertson

Munson

2014

Forests

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Spruce beetle outbreaks have been reported in the Rocky Mountains of western North America since the late 1800s. In their classic paper, Spruce Beetle in the Rockies, Schmid and Frye reviewed the literature that emerged from the extensive outbreaks in Colorado in the 1940s. A new wave of outbreaks has affected Rocky Mountain subalpine spruce-fir forests beginning in the mid-1980s and continuing to the present. These outbreaks have spurred another surge of basic and applied research in the biology, ecology and management of spruce and spruce beetle populations. This paper is a review of literature on spruce beetle focusing on work published since the late 1970s and is intended as an addendum to Spruce Beetle in the Rockies.

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Section: Temperaturementioning

confidence: 99%

Spruce Beetle Biology, Ecology and Management in the Rocky Mountains: An Addendum to Spruce Beetle in the Rockies

Jenkins

Hebertson

Munson

2014

Forests

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“…This variability probably results from adaptations to the subalpine environment (Sota 1996). Temperature has been shown repeatedly to be strongly associated with spruce beetle voltinism (Massey and Wygant 1954;Dyer 1969Dyer , 1970Dyer and Hall 1977;Werner and Holsten 1985), yet the physiological basis of these observations is not clear.…”

Section: Introductionmentioning

confidence: 99%

Physiological basis for flexible voltinism in the spruce beetle (Coleoptera: Scolytidae)

2001

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I obtained, june 16. r88o, from the trunk oi a Poy'ttltts cartdicans, at Buffa1o, N. Y., two iarv:e which proved to be those of C. unijuga' They had passed their last mouit lvhen taken ; although they continued to feed in confinement for five or six days they increased in size but little during that time; their habits are strictiy nocturnal. When f;rst observed they rvere clinging to the bark beneath a 1imb, lying obliquely, and so flattened and leechlike that, together rvith their gray color and lateral fringes bl:ndingYriththe bark, thev were di1ficu1t objects to tiiscover; but for the fact that the first one seen occurred on a plane t'ith the eye they wollld have been overlooked entirely. l\rhen disturbed they jerk themselves from side to side and move off rapidly t'ith the gait of a semi-looper, although possessing sixteen iegs.The larger one measured z.z inches, the smaller e inches. The body is attenuated at extremities, especialll' anteriorly' The general color is gray above, below pink with a sub-elhptical black spot tc each seglnent' those on the thoracic rings not conspicuous. The head flattened, slightly bilobed, lighter in hue than the body and bordered by a well defined black line. The lighter heacl lobes under a hand lens appear mottled and reticr.riated with black lines and blotches. The dorsal line is rvhite, made up of patches, illy defined circles and spots alternating; on each ring on eitl.rer side of the line there are trvo white papillae from each of which arises a rvl.rite hair ; a.bove the stigmata, il'rere is a *'hite interrupted line' belorv them a black line also interrupted. 'Ihe stigmata ere rather large, elliptical, rvhitish surroundecl rvith a black border. There is a rorv of stout hoary filaments just above the line of the iegs. No protuberances al)l)ear on tlrc dorsal aspect of any oI the rings.June zznd the lan'e ceased to feed. On the foIl'orving day they had fastened together some ieaves by neans of a silken gauze, brownish in color; hy the z6th both had transformed. 'Ihe larger pupa rrreesttred r.z in. At first the thorax and abdomen are red, rving covers dusky ; after a feu' hours the whole surface becomes densely pruinose' Under ttre microscope the surface appears rough like Russia leather' The stout thorax is quite convex above, head smooth, abdomen attenuated. its tip black, bealing eieht hooked hairs, the four upper, smaller, turn towards the median line, the fottr under, larger, turn away fiom it; by hooking

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“…That is, under equivalent conditions, individuals predisposed to a shorter life cycle would need to exhibit shorter developmental durations. Instead, all evidence supports flexible voltinism that is regulated by temperature (Massey and Wygant 1954;Dyer 1969;Dyer 1970;Dyer and Hall 1977;Werner and Holsten 1985;Hansen et al 2001a).…”

Section: Discussionmentioning

confidence: 92%

Comparison of reproductive capacity among univoltine, semivoltine, and re-emerged parent spruce beetles (Coleoptera: Scolytidae)

Hansen

Bentz

2003

Can Entomol

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New spruce beetle, Dendroctonus rufipennis (Kirby), adults of univoltine and semivoltine life cycles, as well as re-emerged parent beetles, were laboratory-tested for differences in reproductive capacity and brood characteristics. Parameters measured from the three groups include dry weight, lipid content, and egg production. Brood characteristics measured include egg length, development rates, and survival densities. Although there were some differences in dry weight and lipid content, females from the univoltine, semivoltine, and re-emerged parent groups did not greatly differ in egg production. Egg length was slightly smaller for eggs from univoltine parents, but other measured brood characteristics did not differ among the three parent groups, including the density of the surviving brood. In a field study, re-emerged parent beetles were determined to be flight capable. These findings imply that populations with univoltine broods will have higher growth rates than semivoltine populations. Consequently, the presence of univoltine broods, which is weather dependent, increases the risk of a beetle outbreak or can accelerate the rate of spruce mortality in an established outbreak. These results also indicate that re-emerged parent beetles can contribute substantially to brood production. Suppression strategies can be more effective if managers consider the ecological consequences of brood production from the three parent groups. Hansen EM, Bentz BJ. 2003. Comparaison du potentiel reproductif chez des scolytes de l'épinette (Coleoptera : Scolytidae) univoltins et semivoltins, ainsi que chez des parents émergés pour une seconde fois. The Canadian Entomologist 135 : 697-712. 697 1 Corresponding author (e-mail: matthansen@fs.fed.us).résultats laissent croire aussi que les parents émergés pour une seconde fois peuvent contribuer substantiellement à la production de la progéniture. Les stratégies de suppression seront plus efficaces si les gestionnaires tiennent compte des conséquences écologiques de la reproduction des trois groupes de parents.[Traduit par la Rédaction] 698 THE CANADIAN ENTOMOLOGIST

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FACTORS AFFECTING LARVAL DIAPAUSE IN DENDROCTONUS RUFIPENNIS (COLEOPTERA: SCOLYTIDAE)

Cited by 21 publications

References 4 publications

Spruce Beetle Biology, Ecology and Management in the Rocky Mountains: An Addendum to Spruce Beetle in the Rockies

Spruce Beetle Biology, Ecology and Management in the Rocky Mountains: An Addendum to Spruce Beetle in the Rockies

Physiological basis for flexible voltinism in the spruce beetle (Coleoptera: Scolytidae)

Comparison of reproductive capacity among univoltine, semivoltine, and re-emerged parent spruce beetles (Coleoptera: Scolytidae)

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