Feeding of the chewing louse Damalinia ovis (Schrank) (Phthiraptera:Trichodectidae) on sheep

Sinclair, A. N.; Butler, R. W.; Picton, John

doi:10.1016/0304-4017(89)90019-8

Cited by 28 publications

(7 citation statements)

References 32 publications

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“…However this hypothesis is contradicted by the available mt genome data. Minicircular mt genomes within lice are not confined to blood-feeding taxa being also found in four of the seven philopterid genera studied which are all feather-feeding [57] and in the trichodectid Damalinia which is skin-feeding [58]. Furthermore, minicircular mt genomes are not found in other blood-feeding lice such as the boopiid Heterodoxus [26], or in other blood-feeding arthropods such as mosquitoes [59], reduviid bugs [60], or ticks [61], or in other blood-feeding animals such as leeches (Wu et al unpublished data ).…”

Section: Discussionmentioning

confidence: 99%

Mitochondrial genome deletions and minicircles are common in lice (Insecta: Phthiraptera)

et al. 2011

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BackgroundThe gene composition, gene order and structure of the mitochondrial genome are remarkably stable across bilaterian animals. Lice (Insecta: Phthiraptera) are a major exception to this genomic stability in that the canonical single chromosome with 37 genes found in almost all other bilaterians has been lost in multiple lineages in favour of multiple, minicircular chromosomes with less than 37 genes on each chromosome.ResultsMinicircular mt genomes are found in six of the ten louse species examined to date and three types of minicircles were identified: heteroplasmic minicircles which coexist with full sized mt genomes (type 1); multigene chromosomes with short, simple control regions, we infer that the genome consists of several such chromosomes (type 2); and multiple, single to three gene chromosomes with large, complex control regions (type 3). Mapping minicircle types onto a phylogenetic tree of lice fails to show a pattern of their occurrence consistent with an evolutionary series of minicircle types. Analysis of the nuclear-encoded, mitochondrially-targetted genes inferred from the body louse, Pediculus, suggests that the loss of mitochondrial single-stranded binding protein (mtSSB) may be responsible for the presence of minicircles in at least species with the most derived type 3 minicircles (Pediculus, Damalinia).ConclusionsMinicircular mt genomes are common in lice and appear to have arisen multiple times within the group. Life history adaptive explanations which attribute minicircular mt genomes in lice to the adoption of blood-feeding in the Anoplura are not supported by this expanded data set as minicircles are found in multiple non-blood feeding louse groups but are not found in the blood-feeding genus Heterodoxus. In contrast, a mechanist explanation based on the loss of mtSSB suggests that minicircles may be selectively favoured due to the incapacity of the mt replisome to synthesize long replicative products without mtSSB and thus the loss of this gene lead to the formation of minicircles in lice.

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Section: Discussionmentioning

confidence: 99%

Mitochondrial genome deletions and minicircles are common in lice (Insecta: Phthiraptera)

et al. 2011

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“…It is not known if lice consume oxidised grease. Sinclair et al 4 showed that while lice may be found in the upper wool staple they feed on the skin surface, obtaining their nutrition from fresh secretions. Support for this finding comes from Johnson et al 2 who reported significant survival of lice when they were exposed in vitro to wool samples which were taken at progressively later times after DM treatment, even though each sample contained a similar quantity of DM.…”

Section: Discussionmentioning

confidence: 99%

Production and oxidation of wool grease after shearing

Darwish

Maxwell

1999

Aust Veterinary J

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“…These results support those obtained for sheep in which infestation with D. ovis had no significant influence on their body weights (P > 0.1) 13 . The absence of effect on body weight can probably be ascribed to the fact that biting lice feed on sebaceous secretions, loose scurf and superficial stratum corneum 20 and not on living tissue, and would therefore be unlikely to have a direct effect on the weight of a host animal. The assertion that D. ovis causes ill-thrift in sheep is probably based on the presence of heavy louse burdens on animals already suffering from some other condition, such as malnutrition, and lice may therefore be an indicator, rather than a cause of ill-thrift 13 .…”

Section: Effect On Body Weightmentioning

confidence: 99%

Seasonal occurrence and production effects of the biting louse Damalinia limbata on Angora goats and 2 treatment options

Brown¹,

Linde²,

Fourie³

et al. 2005

J. S. Afr. Vet. Assoc.

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Adult biting lice Damalinia limbata (Gervais 1844) were most numerous on Angora goats in southwestern Free State Province from November to May with the smallest numbers present during August. Nymphs were most numerous from January to March with the smallest numbers present during July. The largest proportion of adult lice was present on the ventral surface of goats during winter, when population numbers were lowest, and the largest proportion of nymphs during summer, when population numbers were highest. Infestation did not affect the body weight of goats, but adversely affected both the quantity and quality of mohair produced. A single treatment with deltamethrin, applied as a pour-on along the mid-line of the backs of the goats, effectively controlled infestation and resulted in a significant increase in mohair production compared with untreated goats. Deltamethrin sprayed along the sides of the animals was equally effective in controlling infestation

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Feeding of the chewing louse Damalinia ovis (Schrank) (Phthiraptera:Trichodectidae) on sheep

Cited by 28 publications

References 32 publications

Mitochondrial genome deletions and minicircles are common in lice (Insecta: Phthiraptera)

Mitochondrial genome deletions and minicircles are common in lice (Insecta: Phthiraptera)

Production and oxidation of wool grease after shearing

Seasonal occurrence and production effects of the biting louse Damalinia limbata on Angora goats and 2 treatment options

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