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50 results for “northern bobwhite”
Fig. 1 in Caecal worm, Aulonocephalus pennula, infection in the northern bobwhite quail, Colinus virginianus
Fig. 1. Histological section of a Northern bobwhite (Colinus virginianus) caecum with intraluminal Aulonocephalus pennula parasites in transverse sections (indicated by arrows). Hematoxylin and eosin staining at 200×; C = cuticle; HD = hypodermis; LC = lateral cord; I = intestines; O = oviducts; U = uterus containing eggs; PCM = polymyarian coelomyarian musculature.
Fig. 3 in Caecal worm, Aulonocephalus pennula, infection in the northern bobwhite quail, Colinus virginianus
Fig. 3. Transverse histological sections of a pen-raised control Northern bobwhite (Colinus virginianus) caecum without an Aulonocephalus pennula infection.
Fig. 2 in Caecal worm, Aulonocephalus pennula, infection in the northern bobwhite quail, Colinus virginianus
Fig. 2. Transverse histological sections of a Northern bobwhite (Colinus virginianus) caecum infected with Aulonocephalus pennula. Hematoxylin and eosin staining at 40× for both A and B.
Fig. 2 in Oxyspirura petrowi infection leads to pathological consequences in Northern bobwhite (Colinus virginianus)
Fig. 2. Histological section of Northern bobwhite (Colinus virginianus) Harderian glands with a varying degree of pathological response associated with Oxyspirura petrowi infection. Scale bar = 200 Mm.
Fig. 3 in Oxyspirura petrowi infection leads to pathological consequences in Northern bobwhite (Colinus virginianus)
Fig. 3. Scanning electron microscope photograph of the head and mouth structure of Oxyspirura petrowi removed from a Northern bobwhite (Colinus virginianus) captured in the Rolling Plains of Texas, USA.
Fig. 1 in Oxyspirura petrowi infection leads to pathological consequences in Northern bobwhite (Colinus virginianus)
Fig. 1. Histological section of a Northern bobwhite (Colinus virginianus) Harderian gland with intraluminal Oxyspirura petrowi parasites in transverse section (indicated by arrows) and marked heterophilic Harderian adenitis. Hematoxylin and eosin staining at 100×, scale = 100 Mm * = marked lymphocyte and heterophilic inflammatory cell infiltrate; C = cuticle; HD = hypodermis; SM = somatic musculature; LC = lateral cords; PC = pseudocoelom; A = alimentary tract; U = uterus containing embryonated eggs.
Fig. 4 in Molecular identification and characterization of partial COX1 gene from caecal worm (Aulonocephalus pennula) in Northern bobwhite (Colinus virginianus) from the Rolling Plains Ecoregion of Texas
Fig. 4. Molecular Phylogenetic analysis by Maximum Likelihood method. The evolutionary history was inferred using the ML method based on the General Time Reversible model. The phylogenetic tree illustrates COX1 gene sequences of nematodes related to A. pennula. Bootstrap values above 50 are shown in the tree. The tree is drawn to scale, with branch lengths measured in the number of substitutions-per-site. All positions containing gaps and missing data were eliminated. Evolutionary analyses were conducted in MEGA7.
Fig. 1. A in Molecular identification and characterization of partial COX1 gene from caecal worm (Aulonocephalus pennula) in Northern bobwhite (Colinus virginianus) from the Rolling Plains Ecoregion of Texas
Fig. 1. A. Caecum of the wild quail B. Morphology of male and female caecal worm. All the parts of male and female caecal worm Aulonocephalus pennula are marked in Fig. 1B.
Fig. 3 in Molecular identification and characterization of partial COX1 gene from caecal worm (Aulonocephalus pennula) in Northern bobwhite (Colinus virginianus) from the Rolling Plains Ecoregion of Texas
Fig. 3. Pairwise alignment of the sequences of A. pennula and H. gallinarum. Sequence variations between A. pennula and H. gallinarum are highlighted in red. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
Fig. 2. A in Molecular identification and characterization of partial COX1 gene from caecal worm (Aulonocephalus pennula) in Northern bobwhite (Colinus virginianus) from the Rolling Plains Ecoregion of Texas
Fig. 2. A. PCR amplification of COX1 gene using nematode primers. Lane M: 100 bp DNA ladder (Fermentas); lane 1‾4 COX1 gene amplicon (750 bp). B. PCR amplification of partial COX1 gene using gene specific primers. Lane M: 100 bp DNA Marker (Fermentas); lane 1‾4 partial COX1 amplified products (405bp).
Fig. 2 in Predicting seasonal infection of eyeworm (Oxyspirura petrowi) and caecal worm (Aulonocephalus pennula) in northern bobwhite quail (Colinus virginianus) of the Rolling Plains Ecoregion of Texas, USA
Fig. 2. Scatterplot of predicted eyeworm reproduction with temperature 60 days prior to collection date with upper and lower 95% confidence intervals.
Fig. 1 in Predicting seasonal infection of eyeworm (Oxyspirura petrowi) and caecal worm (Aulonocephalus pennula) in northern bobwhite quail (Colinus virginianus) of the Rolling Plains Ecoregion of Texas, USA
Fig. 1. Contour and scatterplot of relationships between temperature and precipitation on parasite worm burdens and egg shedding. a) Predicted caecal worm intensity against temperature and precipitation contour plot. b) Scatterplot of predicted caecal worm reproduction against precipitation. d) Predicted eyeworm reproduction against temperature and precipitation contour plot.
Fig. 2. Flow diagrams showing a in "Weight of evidence" as a tool for evaluating disease in wildlife: An example assessing parasitic infection in Northern bobwhite (Colinus virginianus)
Fig. 2. Flow diagrams showing a weight of evidence framework using the (A) 7 questions proposed by Burkhardt-Holm and Scheurer (2007) and the (B) modified questions for addressing disease(s) in wildlife.
Fig. 1 in "Weight of evidence" as a tool for evaluating disease in wildlife: An example assessing parasitic infection in Northern bobwhite (Colinus virginianus)
Fig. 1. Timeline depicting the history of wildlife diseases in the United States: blue boxes are for disease reports and outbreaks, green for improvements to disease research, and red for events that hindered disease research. Abbreviations: foot-and-mouth disease (FMD), Smoot-Hawley Tariff Act (SHTA), State-Federal Cooperative Brucellosis Eradication Program (SFCBER), Bear River Research Station (BRRS), Wildlife Disease Investigations Laboratory (WDIL), Southeastern Cooperative Wildlife Disease Study (SCWDS), epizootic hemorrhagic disease (EHD), World Organisation for Animal Health's (OIE), National Wildlife Research Center (NWRC), U. S. Fish and Wildlife Service (USFWS). References: 1. Antolin et al. (2002), 2. Creel (1941), 3. Anderson (1978), 4. Locke and Friend (1987), 5. McCoy and Chapin (1912), 6. Wherry and Lamb (1914), 7. Meagher and Meyer (1994), 8. Clements (2007), 9, Bachrach (1968), 10. Busch and Parker (1972), 11. USFWS (1991), 12. Tunnicliff and Marsh (1935), 13. Brooks and Buchanan (1970), 14. Elton (1931), 15. Brown (2007), 16. CDFW 2019, 17. Friend (2014), 18. SCWDS 2019, 19. Shope et al. (1960), 20. Cohen (2000), 21. Cross et al. (2013), 22. Samuel et al. (2007), 23. Carvalho et al. (2017), 24. Dobson and Hudson (1986), 25. Jones et al. (2008), 26. Berger et al. (1998), 27. Laurance et al. (1996), 28. Collins and Crump (2009), 29. OIE 2008, 30. Voyles et al. (2015), 31. Fagerstone (2014), 32. USFWS (2016), 33. Scheele et al. (2019). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Northern bobwhite adult breeding season and nest survival Missouri 2014-2018
<p>These data and code are associated with the publication in The Journal of Wildlife Management entitled "Northern Bobwhite breeding season and nest survival are greater on native grasslands." We evaluated the influence of vegetation cover type, woody vegetation structure and composition, and habitat management on nest survival and adult survival from May through September in southwest Missouri 2014-2018.</p>
Northern bobwhite adult breeding season and nest survival Missouri 2014-2018
Open the record for dataset details and reuse information.
Northern Bobwhite juvenile survival southwest Missouri 2016-2018
<p>These data and code are associated with the publication in Ornithological Applications entitled "Northern Bobwhite juvenile survival is greater on native grasslands managed with fire and grazing, and lower in non-native field borders and strip crop fields." We evaluated the influence of brood age, vegetation cover type, woody vegetation structure, habitat management, and landscape cover on juvenile survival in southwest Missouri 2016-2018.</p>
Source population and time spent in captivity affect survival and reproduction of long-distance translocated northern bobwhites
<p>Northern bobwhites (<em>Colinus virginianus</em>) have become a species of great conservation priority because of widespread and ongoing population declines. Long-distance translocations are becoming increasingly used to access a source population with densities high enough to support translocation. Two key uncertainties exist regarding the efficacy of long-distance translocations: choosing a source population with adaptations that will be successful in a novel environment and mitigating the stress response common during the translocation process. We translocated bobwhites from the South Texas Plains and the Floridian Coastal Plain to a recipient site in the Floridian Coastal Plain in 2021 and 2022 to compare the survival and productivity of bobwhites translocated from two different source populations. We also evaluated how varying holding times during the translocation process influenced the success of the translocated individuals. Breeding season survival, nest propensity, and fecundity were greater for Florida resident and Florida translocated bobwhites relative to Texas translocated bobwhites. We observed high rates of mortality during the transport and holding processes, but holding time did not affect breeding season survival of Texas translocated bobwhites. Both nest success and fecundity of Texas translocated bobwhites were negatively affected by holding time. Bobwhites translocated long distances may have the adaptive capacity to be successful in novel environments, but the consequences of translocation stress can be detrimental. Future translocation planning should consider choosing source populations from similar ecoregions to simultaneously decrease translocation distances and potential stress from translocation.</p>
Are breeding activities risky for northern bobwhites? An assessment of survival costs of reproduction
<p>Behaviors associated with breeding can increase mortality risk. This increased risk can be thought of as a cost of reproduction. Increased movements prior to breeding are common as individuals search for food and breeding sites. These increased movements are thought to entail greater predation risks as individuals travel through unfamiliar areas but few studies have looked at how these prebreeding movements affect survival, especially at a fine temporal resolution. Costs of reproduction may also occur during reproduction. For birds, incubation and brood-rearing can increase predation risk because individuals spend most of their time at nest sites or with broods, which may make them more easily detected and captured by predators. Using time- and individual-specific predictors of survival, I examined the relationship between survival, movements, habitat use, and breeding status of northern bobwhites <em>Colinus virginianus</em> in Colorado, USA. I found that prebreeding ranges were larger for breeders (29 ha) than non-breeders (18.7 ha) but daily movement distance was not different (163 m). Range size did not affect survival; however, longer recent daily movement distances (within 10 days) resulted in higher survival. Breeding status also affected survival; laying individuals experienced the highest daily survival rates followed by incubating, non-breeding and brood-rearing individuals. Overall, there appears to be a survival cost of reproduction for individuals during brood-rearing, but I found no evidence that increased movements results in decreased survival.</p>
Data from: Nonbreeding season survival of northern bobwhite in northeastern Colorado
<p>Northern bobwhites have experienced population declines in Colorado and range-wide. Estimating vital rates can provide clues to factors limiting population growth rate. Although recent estimates of breeding season survival in the northwest corner of the northern bobwhite range are available, there have been no recent studies on nonbreeding season survival. We used radio-telemetry to estimate nonbreeding season (Oct–Mar) survival of northern bobwhites at two study sites in northeastern Colorado during winter 2019–2020 and 2020–2021. Based on our sample of 157 bobwhites, we found that survival was highly variable between years and was negatively affected by colder daily minimum temperatures and deeper snow depths. Seasonal (6-month) survival during the first year was 0.219 (SE = 0.040) and during the second year was 0.006 (SE = 0.005). We found no evidence that sex, age, or study site influenced survival, and very weak support for an effect of body mass. During our study, there were two extreme winter weather events, during which we found unusually high numbers of non-predation mortality. Overall, northern bobwhite nonbreeding season survival in the northwest corner of their range appears to be generally similar to other regions, except during extreme winter weather events, which resulted in high mortality. We encourage managers to create or maintain vegetation characteristics that will provide shelter from winter weather while also providing abundant food in close proximity.</p>
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