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Showing 1 to 20 of 46 for “"Lice"”.
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Dynamic Spatial Forecasting of Sea Lice Abundances
Sea lice, Lepeophtheirus salmonis, are a major challenge to both aquaculture and wild salmon populations. L. salmonis infect salmonids, feeding on mucous, skin and flesh of infected fish, reducing fitness and increasing morbidity. The management of sea lice is a key consideration for farm operators …
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Biogeography and phylogenetics of Hawaiian bark lice
In a redefinition of the genus Ptycta (Psocidae), the history of the genera Ptycta Enderlein, 1925, and Copostigma Enderlein, 1903, is assessed. Previously defined as a monophyletic complex based on male genital morphology, Ptycta is redefined as those species of the Ptycta-Copostigma complex with …
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Systematics and cophylogenetics of toucans and their associated chewing lice
… toucans and their ectoparasitic chewing lice using molecular phylogenetic and cophylogenetic reconstructions. First, using mitochondrial DNA sequences, I reconstructed the phylogeny of the Ramphastos toucans. I used this phylogeny to assess whether the striking similarity in plumage and …
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Untangling the coevolutionary history between doves and their parasitic lice
… this strategy by focusing on the wing and body lice of doves. These two “ecomorphs” of lice are not closely related yet exclusively parasitize the same group of hosts. Notably, wing lice have a greater capability for dispersal than body lice. Dispersal is an important ecological component of …
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Sea lice infestation on wild salmonids in the southern part of the Icelandic Westfjords
Laxalús, Lepeophtheirus salmonis og grálús Caligus elongatus, eru náttúruleg sníkjudýr á laxfiskum í sjó. Lýsnar nærast á slímhúð, roði og blóði fiskanna og valda þannig streitu hjá þeim. Þær geta einar og sér valdið dauða fiska séu þær í miklum mæli en geta auk þess borið með sér aðra sýkla. …
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Size Correlations between Sucking Lice and Their Hosts Including a Test of Harrison's Rule
… have larger parasites. In this study, sucking lice (Insecta: Anoplura) were used to test this rule. Sucking lice should provide a good test for this rule because they are generally host-specific and because, as a group, they parasitize hosts of different sizes. Also, sucking lice use their …
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From Micro to Macro: Investigating mechanisms involved in the convergent evolution of feather lice ecomorphs
… macroevolutionary perspective. Parasitic feather lice in the family Philopteridae (Order: Psocodea) are found on almost all species of birds and have repeatedly diversified into ecomorphs specific to areas of their host's body. These morphological characteristics allow them to avoid being groomed …
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Taxonomic, ecological and quantitative examination of chewing lice (Insecta: Phthiraptera) on Canada geese (Branta canadensis) and mallards (Anas platyrhynchos) in Manitoba, Canada
Over 19 years chewing lice data from Canada geese and mallards were collected. From Canada geese (n=300) 48,669 lice were collected, including Anaticola anseris, Anatoecus dentatus, Anatoecus penicillatus, Ciconiphilus pectiniventris, Ornithobius goniopleurus, and Trinoton anserinum. The prevalence …
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Annual cycle and morphology of lice parasitizing two sympatric African small mammals (Micaelamys namaquensis and Elephantulus myurus)
… (abiotic) and host/parasite (biotic) factors. Lice of the suborder Anoplura are permanent haematophagous ectoparasites that spend their entire life cycle on the host. Due to this close relationship, most studies have reported that lice are mainly affected by biotic rather than abiotic factors. …
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Pediculus humanus capitis as a potential vector for Acinetobacter baumannii
… whether this pathogen is also present in head lice in this continent. Objective: The aim of the present study was to determine whether Acinetobacter baumannii was present in head lice specimens collected from three countries in Latin America. Methods: 123 vials containing 368 head lice …
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Lepeophtheirus salmonis, parasitizing three species of pacific salmon (Oncorhynchus spp.): host variations in load, morphology, fecundity, and genetics of the salmon louse
… is to determine biological parameters of salmon lice (Lepeophtheirus salmonis) as they parasitize different species of Pacific Ocean salmonids off the north Pacific coast of Washington State. Parasite load counts of L. salmonis were made and individuals were collected from salmonids in their …
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Analysis of genetic variation in Pediculus humanus and Populus trichocarpa
… understanding of each organism. Body and head lice, while closely related, are thought to be separate species with their most important difference being that only body lice vector disease to humans. The first question is: Are body lice (Pediculus humanus coporis) and head lice (Pediculus …
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Host-parasite cophylogeny and rates of evolution in two rodent-louse assemblages
… and Heteromyidae) and their associated lice (Geomydoecus and Fahrenholzia, respectively) show a statistically significant pattern of cophylogeny. Both host groups are generally solitary organisms and both louse groups are obligate ectoparasites, often exhibiting extreme degrees of host …
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Using a Consensus Process to Develop an Evidence-Based Practice Guideline for School Exclusion For Head Lice (Pediculosis Capitis)
<p>Head lice infestation (Pediculosis capitis) is a common nuisance in young children, carrying a social stigma that associates infestation with poverty and poor hygiene. School exclusion laws, regulations, and policies for head lice are implemented to decrease spread in the school setting. …
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Molecular docking and geographical information systems as tools to assess the potential impact of veterinary medicines on non-target organisms and the environment
… (MECs) and potential impact of sea lice treatments on salmon farms in Scotland. Alternative methods for ecotoxicology testing including mixture toxicity, and the use of in silico techniques to predict the chronic impact of VMs on different species of aquatic organisms were also …
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Η ΦΘΕΙΡΙΑΣΗ ΤΟΥ ΤΡΙΧΩΤΟΥ ΤΗΣ ΚΕΦΑΛΗΣ ΣΤΗΝ ΠΡΟΣΧΟΛΙΚΗ ΚΑΙ ΣΧΟΛΙΚΗ ΗΛΙΚΙΑ
… DAILY BY THEIR PARENTS FOR THE PRESENCE OF LICE. YOUNG CHILDREN ARE EXAMINED MORE FREQUENTLY THAN THE OLDER ONES. FOURTY THREE PER CENT OF THE CHILDREN REPORT THEIR INFESTATION IN SCHOOL PERSONNEL . ITCHING IS THE MAJOR SYMPTOM OF PEDICULOSIS. SUMMER IS THE TIME OF THE HIGHER LICE FREQUENCY.
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The Determination of Emamectin Benzoate and its Fate in the Environment as a Result of Fish Farming
… A convenient and effective way to control sea lice and treat farmed salmon is by in-feed treatments such as Slice®.<br/>A reliable, accurate and reproducible method for the determination of emamectin benzoate (EB), the active ingredient of Slice®, and its desmethylamino metabolite (DES) in …
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