The role of parasitism and intraspecific competition in the population dynamics of the bark beetle, <i>Leperisinus varius</i> (Fabr.) (Col., Scolytidae) on European olives (<i>Oka europea</i> L.)

Lozano, C.; Campos, Mercedes; Kidd, N. A. C.; Jervis, M. A.

doi:10.1111/j.1439-0418.1994.tb00723.x

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…Parasitoids do not necessarily exhibit responses to bark beetle density, although ectoparasitoids showed a density-dependent response when bark beetle density became high (Beaver 1966(Beaver , 1967. In other cases, however, parasitism of bark beetle larvae tended to be inversely density-dependent (Lozano et al 1993(Lozano et al , 1994(Lozano et al , 1996a. Predation resulted in delayed densitydependent mortality of the southern pine beetle (Turchin et al 1999), which corresponds with our findings.…”

Section: Discussionsupporting

confidence: 87%

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Pathogen's level and parasitism rate in Ips typographus at high population densities: importance of time

Holuša

Lukášová

2017

J Applied Entomology

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We compared the levels of pathogen infection in parental beetles, parasitism of the offspring, abundance of predators and breeding performance success of univoltine populations of Ips typographus in plots characterized by short-term (2-3 years) outbreaks vs. those with long-term (>10 years) outbreaks on two localities at ca. 1100 m altitude in the Sumava Mts. The numbers of I. typographus were high in all plots, whether the plots were characterized by long-term outbreaks or short-term outbreaks. The numbers of maternal galleries in the sample areas ranged from 300 to 400 per m 2 . The density of parental beetle galleries, abundance of surviving specimens of I. typographus, and length of maternal galleries did not differ between plots. The short-term outbreaks had only fewer ectoparasitoids of I. typographus and a lower percentage of parasitism and infection level of Mattesia schwenkei than the long-term outbreaks even though the maternal gallery densities and beetle production were the same. The most mortality appeared to be caused by intraspecific larval competition, and the identical reproductive success in plots with short-term and long-term outbreaks indicates that the negative feedback resulting from parasitoids and entomopathogens does not substantially reduce beetle numbers. Although entomopathogenic fungi as Beauveria bassiana occur naturally in the galleries of spruce bark beetles, there was no evidence of its presence in the studied population. The low levels of predation and/or parasitism in both kinds of plots indicate that natural enemies did not play a significant role in reducing outbreak numbers of I. typographus.

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Section: Discussionsupporting

confidence: 87%

“…In other cases, however, parasitism of bark beetle larvae tended to be inversely density‐dependent (Lozano et al. , , ,b). Predation resulted in delayed density‐dependent mortality of the southern pine beetle (Turchin et al.…”

Section: Discussionmentioning

confidence: 99%

Pathogen's level and parasitism rate in Ips typographus at high population densities: importance of time

Holuša

Lukášová

2017

J Applied Entomology

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“…When this occurs, the larvae come into direct competition for phloem food resources. This type of larval competition has also been observed in the bark beetles Hylesinus varius (LOZANO et al, 1993(LOZANO et al, , 1994 and Scolytus ventralis (STARK and BORDEN, 1965;BERRY-MAN, 1968).…”

Section: Of Overwintering Adults Other Parameter Values As In Equatisupporting

confidence: 52%

The population dynamics of the bark beetle Phloeotribus scarabaeoides (Col., Scolytidae) on European olive (Olea europaea)

Lozano

Kidd

Campos

1996

J Applied Entomology

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The life‐stage mortalities of the bark‐beetle pest P. scarabaeoides were studied in a Spanish olive orchard by placing cut logs in the field for adult females to breed. Mortality was found to be greatest at the larval stage with about 25% of the original egg number surviving to adulthood. The density of eggs laid per maternal gallery does not appear to affect the degree of subsequent mortality at the egg, larval or pupal stages. However, the density of maternal galleries on a log has a positive (density‐dependent) influence on the mortality of larvae, but not of eggs or pupae. The density‐dependent larval mortality could be attributed to both insect parasitoids and intraspecific competition, but the relative contribution of each was unclear. The proportion of adult females excavating maternal galleries was also shown experimentally to be density dependent. A simple model, based on the information presented, showed that the population is regulated primarily by density‐dependence in the level of female attack, stabilizing the population at three attacking females/dm2. Mortality of overwintering adults in the trees is unlikely to affect this equilibrium significantly.

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“…Mills (1991) studied searching strategies and attack rates of parasitoids and its relevance to biological control. Lozano et al (1994) studied the role of the parasitism and intraspecific competition in the population dynamics of the bark beetle. Campos and Lozano (1994) on H. fraxini researched reproductive biology of Cheiropachus quadrum (Hymenoptera: Pteromalidae) and Dendrosoter protuberans (Hym.…”

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confidence: 99%

Contribution to knowledge of Hylesinus fraxini (Panzer, 1779) (Coleoptera: Scolytidae) natural enemies from Northern Moravia (Czech Republic)

Nakládal¹,

Turčáni²

2007

J. For. Sci.

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Predation by natural enemies was studied as mortality factors of Hylesinus fraxini in 2006-2007. Predation by birds was not recorded and predation rate by insect reached 0.1%. Only one insect predator was reared -Thanasimus formicarius (Linnaeus, 1758). The total rate of parasitism was 54.0%. At least 8 species of parasitoids from the order Hymenoptera were recorded. The most abundant parasitoid was Eurytoma morio Boheman, 1836 (44.1% from the total number of all reared parasitoids; 23.8% of the total mortality), subsequently Eurytoma arctica Thomson, 1876 (31.7%; 17.1%), Cheiropachus quadrum (Fabricius, 1787) (12.8%; 6.9%), Braconidae (6.3%; 3.4%), Rhaphitelus maculatus Walker, 1834 (3.9%; 2.1%), Mesopolobus sp. (0.5%; 0.3%), were not identified Pteromalidae (0.5%; 0.3%) and Tetrastichus sp. (0.2%; 0.1%).

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The role of parasitism and intraspecific competition in the population dynamics of the bark beetle, Leperisinus varius (Fabr.) (Col., Scolytidae) on European olives (Oka europea L.)

Cited by 7 publications

References 10 publications

Pathogen's level and parasitism rate in Ips typographus at high population densities: importance of time

Pathogen's level and parasitism rate in Ips typographus at high population densities: importance of time

The population dynamics of the bark beetle Phloeotribus scarabaeoides (Col., Scolytidae) on European olive (Olea europaea)

Contribution to knowledge of Hylesinus fraxini (Panzer, 1779) (Coleoptera: Scolytidae) natural enemies from Northern Moravia (Czech Republic)

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