Les perturbations induites par <i>Parasitorhabditis ipsophila</i> (Nematoda : Rhabditidae) dans le tube digestif d’<i>Ips sexdentatus</i> (Insecta : Scolytidae)

Lieutier, François

doi:10.1051/parasite/1984596597

Cited by 6 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rühm & Chararas (1957) suggested that such lesions could result in death of their hosts but a statistical re‐analysis of their results showed that the presence of nematodes in the digestive tract was not significantly associated with dead hosts ( χ 2 = 0.065; P = 0.97). Moreover, Lieutier (1984a,b) clearly showed that despite the lesions, Parasitorhabditis exert no or only very slight effects on host performance (here: I. sexdentatus ) and do not regulate host populations. Apparently, the nematodes, and thus the lesions, are confined to specific areas of the digestive tract only, leaving most of its absorptive areas unaffected (Lieutier, 1984a).…”

Section: Methodsmentioning

confidence: 99%

“…Individuals of the genus Parasitorhabditis live as such Dauerlarve in the digestive tract of bark beetles. Several studies have shown that a heavy infection by these nematodes may damage the intestinal epithelium of their hosts (Rühm & Chararas, 1957; Nickle, 1963; Lieutier, 1984a). Rühm & Chararas (1957) suggested that such lesions could result in death of their hosts but a statistical re‐analysis of their results showed that the presence of nematodes in the digestive tract was not significantly associated with dead hosts ( χ 2 = 0.065; P = 0.97).…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, Lieutier (1984a,b) clearly showed that despite the lesions, Parasitorhabditis exert no or only very slight effects on host performance (here: I. sexdentatus) and do not regulate host populations. Apparently, the nematodes, and thus the lesions, are confined to specific areas of the digestive tract only, leaving most of its absorptive areas unaffected (Lieutier, 1984a).…”

Section: Details On Nematodesmentioning

confidence: 99%

See 2 more Smart Citations

On the track of the Red Queen: bark beetles, their nematodes, local climate and geographic parthenogenesis

Meirmans

Skorping

Løyning

et al. 2006

Journal of Evolutionary Biology

View full text Add to dashboard Cite

Geographic parthenogenesis has been explained as resulting from parasite pressure (Red Queen hypothesis): several studies have found high degrees of sexuals where the prevalence of parasites is high. However, it is important to address whether prevalence of parasites mirrors risk of infection. We explored geographic parthenogenesis of Ips acuminatus bark beetles and their nematodes. Local climate is crucial for nematode stages outside the host, in spring and summer, and prevalence should thus be associated with those temperatures if prevalence reliably reflects exposure risk across populations. This was the case; however, high prevalence of a virulent nematode species was not associated with many sexuals, whereas highly sexual populations were characterized by high infection risk of benign nematodes. Low virulence of the latter makes Red Queen dynamics unlikely. Geographical patterns of parthenogenesis were instead associated with winter temperature and variance in temperature.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Details On Nematodesmentioning

confidence: 99%

See 1 more Smart Citation

On the track of the Red Queen: bark beetles, their nematodes, local climate and geographic parthenogenesis

Meirmans

Skorping

Løyning

et al. 2006

Journal of Evolutionary Biology

View full text Add to dashboard Cite

show abstract

“…This is inconsistent with the ndings of 60 , who found signi cant damage to gastrointestinal epithelial cells in Ips sexdentatus individuals parasitized by Parasitorhabditis spp. In a subsequent study, 25 reported a slight decrease in the density of oviposition incisions and in the number of eggs in Ips sexdentatus individuals parasitized by Parasitorhabditis sp. In the current study, the presence of nematodes in the intestines of I. typographus was associated with a decrease in fecundity of two eggs per female.…”

Section: Discussionmentioning

confidence: 87%

“…To reduce competition, females may leave the gallery system prematurely and deposit eggs elsewhere 13,22,23 . Another important factor reducing egg production could be the presence of some pathogens and parasites in the body cavity of the host 24,25 .…”

Section: Introductionmentioning

confidence: 99%

Relationships between the fecundity of two bark beetle pests and the presence of antagonist

Resnerová

Schovánková

Horák

et al. 2022

Preprint

View full text Add to dashboard Cite

Although previous research has documented the occurrence of antagonists of bark beetles, the studies have only evaluated individual antagonists and have not assessed the overall effect of all antagonists on adult beetles. In this study, we determined which antagonists were associated with reduction in the fecundity and maternal gallery lengths of two important species of bark beetles: Ips typographus on spruce and I. cembrae on larch. We evaluated these relationships under natural conditions by collecting maternal females in galleries and dissecting and examining their internal organs. The antagonists in the I. typographus hemolymph had the most significant negative associations with fecundity and gallery length. These antagonists were mainly nematodes and parasitoids in the hemocoel. In contrast, a positive association was found between gregarine presence and I. typographus fecundity. No antagonist was found that was likely to significantly alter I. cembrae fecundity or maternal gallery length. Our study provides the first comprehensive assessment of antagonists that may have the potential to reduce the fecundity and thereby reduce the outbreaks of these bark beetles.

show abstract

Bark Beetles of Mediterranean Conifers

Lieutier

Mendel

Faccoli

2016

Insects and Diseases of Mediterranean Forest Systems

View full text Add to dashboard Cite

Les perturbations induites par Parasitorhabditis ipsophila (Nematoda : Rhabditidae) dans le tube digestif d’Ips sexdentatus (Insecta : Scolytidae)

Cited by 6 publications

References 10 publications

On the track of the Red Queen: bark beetles, their nematodes, local climate and geographic parthenogenesis

On the track of the Red Queen: bark beetles, their nematodes, local climate and geographic parthenogenesis

Relationships between the fecundity of two bark beetle pests and the presence of antagonist

Bark Beetles of Mediterranean Conifers

Contact Info

Product

Resources

About