Prey Consumption and Longevity of Adult
Thanasimus dubius123

Turnbow, Robert H.; Franklin, Rudolph T.; Nagel, W. P.

doi:10.1093/ee/7.5.695

Cited by 13 publications

(5 citation statements)

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“…Variability in prepupal + pupal duration could thus be mainly attributed to the prepupal stage. This finding also confirmed the findings of Turnbow et al (1978) that the pupal period itself was relatively constant. Several authors (e.g.…”

Section: Bionomics Of Laboratory-reared Insectssupporting

confidence: 90%

Rearing of two predators, Thanasimus dubius and Temnochila virescens, for the biological control of Ips grandicollis in Australia

Lawson

Morgan

1992

Entomologia Exp Applicata

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Rearing methods for two coleopterous predators, Thanasimus dubius and Temnochila virescens, imported into Australia for the biological control of Ips grandicollis, were developed. Bionomic data obtained from laboratory rearings between 1982–1987 showed that T. dubius eggs took about 7 days to hatch and that duration of the larval stage was about 42 days. Observations showed that T. dubius had a prolonged prepupal stage (x̄ = 56.4 days, range 14–274 days), which was probably non‐diapausal in nature. Mean adult longevity was 50 days (range 1–358 days). Temnochila virescens eggs took almost 9 days to hatch, and a lengthy larval stage (x̄ = 155.4 days, range 73–333 days) was observed. Mean duration of the pupal stage was 14 days (range 7–28 days). A long preoviposition period (x̄ = 141 days, range 47–206 days) was observed, and adults were very long‐lived (x̄ = 232.7 days, range 14–667 days). Capacity for increase (rc) calculated from rearing data suggested that numbers of T. dubius could be increased faster than T. virescens. Mortality between 1982–1987 averaged about 70% for both species. However, mortality of T. dubius in 1987 increased significantly, suggesting that inbreeding or other methodological factors could be responsible. A mass‐rearing method using Ips‐infested pine billets was developed as a cheaper alternative to laboratory rearing, and was shown to be effective in producing large numbers of insects for release.

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Section: Bionomics Of Laboratory-reared Insectssupporting

confidence: 90%

Rearing of two predators, Thanasimus dubius and Temnochila virescens, for the biological control of Ips grandicollis in Australia

Lawson

Morgan

1992

Entomologia Exp Applicata

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“…(Col., Histeridae) are the most abundant predators of I. pini in the Great Lakes region (Raffa 1991, Aukema et al 2000, Erbilgin and Raffa 2001, Ryall 2003). Thanasimus dubius (Coleoptera, Cleridae), in particular, has been shown to be a significant source of mortality of various scolytid species (Thatcher and Pickard 1966, Turnbow et al 1978, Reeve 1997, Aukema and Raffa 2002, Ryall 2003). While predators such as T. dubius feed on a variety of prey species in the sub‐cortical habitat, they are restricted to the same coniferous habitat as their prey.…”

Section: Methodsmentioning

confidence: 99%

Habitat loss decreases predator–prey ratios in a pine‐bark beetle system

Ryall¹,

Fahrig²

2005

Oikos

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L. 2005. Habitat loss decreases predator Á/prey ratios in a pinebark beetle system. Á/ Oikos 110: 265 Á/270.Increasing intensity of land use by humans has led to loss of natural habitats, resulting in isolation of remaining habitat fragments. Using a pine-bark beetle ecosystem as a model, we tested the hypothesis that the ratio of abundance of predators to prey should decrease with increasing habitat loss at the landscape scale. We selected ten red pine (Pinus resinosa ) sites, representing extremes of available habitat within a 2 km radius surrounding each stand. The bark beetle, Ips pini , and its coleopteran predators were sampled using baited multiple funnel traps. Effects of stand isolation were considerable; ratios of predators to prey (mean number of predators/number of prey9/SE) were significantly reduced in isolated stands (0.389/0.09) as compared to those with large amounts of surrounding conifer habitat (1.639/0.41). The decline in ratio occurred both because there was: a) a lower abundance of predators (ca 0.5 Á/0.8 )/) captured in isolated stands; and b) a significantly higher number of prey (ca 2.2 )/) captured in isolated stands. Isolation or loss of habitat, therefore, differentially affected the two trophic levels, supporting theoretical predictions. Reductions in predator abundance and, presumably, enemy-caused mortality may lead to changes in the population dynamics of their prey species, possibly leading to increased outbreaks as habitat becomes increasingly isolated.

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“…Although these studies have not identified which natural enemies are most responsible for the delayed response, the common predator Thanasimus dubius (F.) (Coleoptera: Cleridae) is a promising candidate. This predator appears to be a significant source of D. front&s mortality (Thatcher & Pickard, 1966;Tumbow et&., 1978;Reeve, 1997;Reeve & Turchin, 2000), and high densities of T. dubius are often associated with declining and low level D. frontalis populations (Billings, 1988;Reeve, 1997;Turchin etal., 1999), as would be expected if they are agents of delayed density dependence. Adult T. dubius arrive almost immediately after mass attack is initiated, attracted by the pheromones of D. frontalis (Vim & Williamson, 1970;Dixon & Payne, 1979a).…”

Section: Introductionmentioning

confidence: 99%

Complex emergence patterns in a bark beetle predator

Reeve

2000

Agri and Forest Entomology

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1 The emergence pattern of Thanasimus dubius (F.) (Coleoptera: Cleridae), a common predator of the southern pine beetle, Dendroctonus frontalis Zimmermann (Coleoptera: Scolytidae), was studied under field conditions across different seasons. A simple statistical model was then developed to characterize the emergence data, using the truncated geometric distribution. Data are also presented on the mortality of T. dubius eggs at various temperatures and humidities in an effort to explain certain aspects of emergence behaviour. 2 Emergence of 7'. dubius from a given tree usually occurred in several discrete episodes across a two-year period, with most individuals emerging in spring or autumn. Almost no emergence occurred in July and August, which may be an adaptation to avoid high temperature mortality. Emergence patterns appeared similar across seasons, with the time of year serving mainly to shift the pattern through time. 3 Cycles in D. frontalis abundance may be the result of delayed density dependence generated by its natural enemy complex. The predator T. dubius is likely to be an important component of this delayed density dependence, because of its lengthy development time and apparent impact on D. front&s.

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Prey Consumption and Longevity of Adult Thanasimus dubius123

Cited by 13 publications

References 0 publications

Rearing of two predators, Thanasimus dubius and Temnochila virescens, for the biological control of Ips grandicollis in Australia

Rearing of two predators, Thanasimus dubius and Temnochila virescens, for the biological control of Ips grandicollis in Australia

Habitat loss decreases predator–prey ratios in a pine‐bark beetle system

Complex emergence patterns in a bark beetle predator

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