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379 results for “helminths”
Figs. 1–14 in Helminths Of Melomys Rufescens And Melomys Spp. (Muridae: Hydromyinae) From Papua New Guinea With The Descriptions Of A New Genus And Five New Species In The Heligmonellidae (Nematoda: Trichostrongyloidea)
Figs. 1–14. Heligmonoides mirzai, new species, from Melomys rufescens and Melomys sp. from Papua New Guinea: 1, female anterior end, lateral view; 2, male cross section, anterior body; 3, female cross section, anterior body; 4, male cross section, midbody; 5, female cross section, midbody; 6, spicule tips; 7, male cross section, posterior body; 8, female cross section, posterior body; 9, genital cone, dorsal view; 10, ovejector, lateral view; 11, gubernaculum, lateral view; 12, female posterior end, lateral view; 13, dorsal ray; 14, bursa, left lateral view. Scale bars: 1, 10, 11, 14 = 50 μm; 2–5, 7, 8, 12 = 25 μm; 6 = 10 μm; 9, 13 = 12.5 μm.
Figs. 29–38 in Helminths Of Melomys Rufescens And Melomys Spp. (Muridae: Hydromyinae) From Papua New Guinea With The Descriptions Of A New Genus And Five New Species In The Heligmonellidae (Nematoda: Trichostrongyloidea)
Figs. 29–38. Odilia similis, new species, from Melomys rufescens and Melomys spp. from Papau New Guinea: 29, female anterior end, lateral view; 30, male cross section, anterior body; 31, bursa, right lateral view; 32, male cross section, midbody; 33, spicule tips; 34, dorsal ray; 35, female posterior end, lateral view; 36, male cross section, posterior body; 37, gubernaculum, lateral view; 38, genital cone, lateral view. Figs. 39–43. Odilia species from Melomys rufescens and Melomys sp. from Papau New Guinea: 39, male cross section, anterior body; 40, dorsal ray; 41, bursa, left lateral view; 42, male cross section, midbody; 43, spicule tips. Scale bars: 29 = 100 μm; 30–34, 37–43 = 25 μm; 35 = 200 μm; 36 = 10 μm.
Figs. 15–28 in Helminths Of Melomys Rufescens And Melomys Spp. (Muridae: Hydromyinae) From Papua New Guinea With The Descriptions Of A New Genus And Five New Species In The Heligmonellidae (Nematoda: Trichostrongyloidea)
Figs. 15–28. Melomystrongylus sepikensis, new genus, new species, from Melomys rufescens and Melomys spp. from Papua New Guinea: 15, female anterior end, lateral view; 16, male cross section, anterior body; 17, female cross section, anterior body; 18, female cephalic end, lateral view showing synlophe; 19, male cross section, midbody; 20, female cross section, midbody; 21, female posterior end, lateral view showing ovejector; 22, dorsal ray; 23, female cross section, posterior end; 24, female posterior end, ventral view showing well developed praepuce; 25, bursa, left lobe, lateral view; 26, genital cone, lateral view; 27, gubernaculum, lateral view; 28, spicule tips. Scale bars: 15, 24 = 100 μm; 16, 18–20, 22, 23, 25–28 = 25 μm; 17 = 20 μm; 21 = 50 μm.
Fig. 7 in Review Of The Helminths Of Carnivora (Mammalia) In Ukraine: Composition And Structure Of Helminth Fauna
Fig. 7. Prevalence (%) of main groups of helminths in Mustelidae (combined sample) and the American mink.
Fig. 8 in Review Of The Helminths Of Carnivora (Mammalia) In Ukraine: Composition And Structure Of Helminth Fauna
Fig. 8. Infection prevalence and mean intensity of species composing the core of helminth fauna in Mustelidae (combined sample of 8 species); Pe.mu — Pearsonema mucronata, Is.me — Isthmiophora melis, Sp.er — Spirometra erinaceieuropei, Ao.pu — Aonchotheca putorii, Ap.do — Apophallus donicus, Ps.tr — Pseudoamphistomum truncatum, Mo.pa — Molineus patens.
Fig. 4 in Review Of The Helminths Of Carnivora (Mammalia) In Ukraine: Composition And Structure Of Helminth Fauna
Fig. 4. Infection prevalence and mean intensity of species composing the core of helminth fauna in the wolf; Un.st — Uncinaria stenocephala, Ta.hy — Taenia hydatigena, Al.al — Alaria alata, Me.li — Mesosestoides lineatus, Tr.vu — Trichuris vulpis, To.le — Toxascaris leonina, To.ca — Toxocara canis.
Fig. 5 in Review Of The Helminths Of Carnivora (Mammalia) In Ukraine: Composition And Structure Of Helminth Fauna
Fig. 5. Infection prevalence and mean intensity of species composing the core of helminth fauna in the raccoon dog; Un.st — Uncinaria stenocephala, Al.al — Alaria alata, Sp.er — Spirometra erinaceieuropei, Is.me — Isthmiophora melis, St.er — Strongyloides erschowi, Ap.do — Apophallus donicus, Me.sk — Mesostephanus skworzowi, Me.li — Mesosestoides lineatus, Ec.pe — Echinochasmus perfoliatus, Ta.cr — Taenia crassiceps.
Fig. 3 in Review Of The Helminths Of Carnivora (Mammalia) In Ukraine: Composition And Structure Of Helminth Fauna
Fig. 3. Infection prevalence and mean intensity of species composing the core of helminth fauna in the red fox; Me.li — Mesosestoides lineatus, Al.al — Alaria alata, To.le — Toxascaris leonina, Te.po — Taenia polyacantha, Un.st — Uncinaria stenocephala, To.ca — Toxocara canis, Ta.cr — Taenia crassiceps, Pe.pl — Pearsonema plica, Eu.ae — Eucoleus aerophilus.
Fig. 9 in Review Of The Helminths Of Carnivora (Mammalia) In Ukraine: Composition And Structure Of Helminth Fauna
Fig. 9. Infection prevalence and mean intensity of species composing the core of helminth fauna in the American mink; Sp.er — Spirometra erinaceieuropei, Is.me — Isthmiophora melis, Ap.do — Apophallus donicus, Pe.mu — Pearsonema mucronata, Ps.tr — Pseudoamphistomum truncatum, Ao.pu — Aonchotheca putorii, Ec.pe — Echinochasmus perfoliatus.
Fig. 6 in Review Of The Helminths Of Carnivora (Mammalia) In Ukraine: Composition And Structure Of Helminth Fauna
Fig. 6. Number of helminth species found in eight species of Mustelidae (combined sample) and the American mink.
Comparative analysis of helminth infectivity: growth in intermediate hosts increases establishment rates in the next host
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Eco-evolutionary dynamics of anthelmintic resistance in soil-transmitted helminths
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Data from: Adaptive division of growth and development between hosts in helminths with two-host life cycles
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Effects of food supplementation and helminth removal on space use and spatial overlap in wild bank vole populations
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Data from: Tradeoffs with growth limit host range in complex life cycle helminths
Parasitic worms with complex life cycles have several developmental stages, with each stage creating opportunities to infect additional host species. Using a dataset for 973 species of trophically transmitted acanthocephalans, cestodes, and nematodes, we confirmed that worms with longer life cycles (i.e. more successive hosts) infect a greater diversity of host species and taxa (after controlling for study effort). Generalism at the stage level was highest for 'middle' life stages, the second and third intermediate hosts of long life cycles. By simulating life cycles in real food webs, we found that middle stages had more potential host species to infect, suggesting that opportunity constrains generalism. However, parasites usually infected fewer host species than expected from simulated cycles, suggesting generalism also has costs. There was no tradeoff in generalism from one stage to the next, but worms spent less time growing and developing in stages where they infected more taxonomically diverse hosts. Our results demonstrate that life cycle complexity favors high generalism, and host use across life stages is determined by both ecological opportunity and life history tradeoffs.
Figure 1 in Relationships between helminth communities and diet in Canarian lizards: the evidence from Gallotia atlantica (Squamata: Lacertidae)
Figure 1. Location of the islands and sampling sites where the different subspecies were collected.
Life-cycle complexity in helminths: What are the benefits?
<p>Parasitic worms (i.e. helminths) commonly infect multiple hosts in succession. With every transmission step, they risk not infecting the next host and thus dying before reproducing. Given this risk, what are the benefits of complex life cycles? Using a dataset for 973 species of trophically transmitted acanthocephalans, cestodes, and nematodes, we tested whether hosts at the start of a life cycle increase transmission and whether hosts at the end of a life cycle enable growth to larger, more fecund sizes. Helminths with longer life cycles, i.e. more successive hosts, infected conspicuously smaller first hosts, slightly larger final hosts, and exploited trophic links with lower predator-prey mass ratios. Smaller first hosts likely facilitate transmission because of their higher abundance and because parasite propagules were the size of their normal food. Bigger definitive hosts likely increase fecundity because parasites grew larger in big hosts, particularly endotherms. Helminths with long life cycles attained larger adult sizes through later maturation, not faster growth. Our results indicate that complex helminth life cycles are ubiquitous because growth and reproduction are highest in large, endothermic hosts that are typically only accessible via small intermediate hosts, i.e. the best hosts for growth and transmission are not the same.</p>
Fig. 1 in Helminth communities of two populations of Myotis chiloensis (Chiroptera: Vespertilionidae) from Argentinean Patagonia
Fig. 1. Location of the sampling sites in the province of Río Negro, Argentina.
Fig. 2 in Helminth infections in fish in Vietnam: A systematic review
Fig. 2. Distribution map of potentially zoonotic helminths in fish in Vietnam.
Fig. 1 in Helminth infections in fish in Vietnam: A systematic review
Fig. 1. Distribution map of potentially pathogenic helminths in fish in Vietnam.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.