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D Etter - One of the best experts on this subject based on the ideXlab platform.
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high prevalence of antibodies to neospora caninum in white tailed Deer odocoileus virginianus
International Journal for Parasitology, 1999Co-Authors: J P Dubey, K Hollis, Stephane Romand, P Thulliez, O C H Kwok, L Hungerford, C Anchor, D EtterAbstract:Serum samples of 400 white-tailed Deer (Odocoileus virginianus) from 16 preserves in northeastern Illinois were tested for Neospora caninum antibodies in the N. caninum agglutination test using mouse-derived N. caninum tachyzoites and mercaptoethanol. Antibodies were found in 162 Deer with titres of 1:40 (47 Deer), 1:80 (32 Deer), 1:160 (17 Deer), 1:200 (eight Deer), 1:400 (19 Deer), 1:800 (17 Deer) and ≥1:1600 (22 Deer). There were no significant differences in prevalence between age or sex of the Deer. The high prevalence of N. caninum infection in Deer is consistent with a sylvatic cycle of N. caninum.
J P Dubey - One of the best experts on this subject based on the ideXlab platform.
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high prevalence of antibodies to neospora caninum in white tailed Deer odocoileus virginianus
International Journal for Parasitology, 1999Co-Authors: J P Dubey, K Hollis, Stephane Romand, P Thulliez, O C H Kwok, L Hungerford, C Anchor, D EtterAbstract:Serum samples of 400 white-tailed Deer (Odocoileus virginianus) from 16 preserves in northeastern Illinois were tested for Neospora caninum antibodies in the N. caninum agglutination test using mouse-derived N. caninum tachyzoites and mercaptoethanol. Antibodies were found in 162 Deer with titres of 1:40 (47 Deer), 1:80 (32 Deer), 1:160 (17 Deer), 1:200 (eight Deer), 1:400 (19 Deer), 1:800 (17 Deer) and ≥1:1600 (22 Deer). There were no significant differences in prevalence between age or sex of the Deer. The high prevalence of N. caninum infection in Deer is consistent with a sylvatic cycle of N. caninum.
David S. Decalesta - One of the best experts on this subject based on the ideXlab platform.
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white tailed Deer impact on the vegetation dynamics of a northern hardwood forest
Ecological Applications, 2003Co-Authors: Stephen B Horsley, Susan L Stout, David S. DecalestaAbstract:Considerable controversy has arisen over the management of white-tailed Deer in eastern landscapes where there is evidence of damage to forest vegetation, crops, and wildlife habitat attributable to Deer. We examined the impact of 4, 8, 15, and 25 Deer/ km 2 on herbaceous layer abundance and tree seedling density, height development, species composition, and diversity for 10 yr in a repeated-measures randomized-complete-block experiment at four replicate cherry-maple forest sites in northwestern Pennsylvania, USA. At each 65-ha site, Deer were placed in 13- or 26-ha fenced enclosures in which the landscape composition and forage production of a forest managed on a 100-yr rotation was simulated by clear-cutting 10% of each area and thinning 30%. Vegetation was sampled 0-1, 3, 5, and 10 yr after treatment (YAT). We analyzed vegetative treatment responses separately in each silvicultural treatment. Time was an important factor mediating responses at all Deer densities. Rubus spp. abundance in all silvicultural treatments and the density of striped maple (STM) in clearcuts and birch (BI), American beech (AB), and red maple (RM) in thinnings showed negative trends with increasing Deer density. As Deer density increased, we found negative linear trends in the height of BI, RM, and AB in clearcuts; in the height of AB, RM, and STM in thinnings; and in the height of AB and RM in uncut stands. Species richness showed a negative linear trend with increasing Deer density in all silvicultural treatments. Conversely, species avoided by Deer or resilient to Deer browsing increased with in- creasing Deer density. Percent cover of ferns, grasses, and sedges showed positive linear trends with Deer density in clearcuts and in thinnings. The percentage of plots dominated by black cherry (BC) increased with increasing Deer density in cut and uncut stands. The net result of increased Deer impact was an altered trajectory of vegetation development dominated by species avoided by Deer or resilient to Deer browsing. Negative effects on vegetation became significant at Deer impact levels well below those observed in many eastern forests. Moreover, species not browsed or resilient to browsing may have indirect effects on vegetation development through plant-plant interactions and on wildlife habitat quality for small mammals, birds, and Deer. Managing these impacts is important as pressures to harvest and fragment eastern forests accelerate.
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Effect of white-tailed Deer on songbirds within managed forests in Pennsylvania
Journal of Wildlife Management, 1994Co-Authors: David S. DecalestaAbstract:White-tailed Deer (Odocoileus virginianus) populations have been maintained at high densities in Pennsylvania for several decades with unknown effects on songbirds and their habitats. I evaluated effects of white-tailed Deer density on songbird species richness, abundance, and habitat. I simulated 4 Deer densities (3.7, 7.9, 14.9, and 24.9 Deer/km2) within individually fenced enclosures on 4 65-ha forest areas in northwestern Pennsylvania. Within all enclosures, 10% of the area was clear-cut and 30% was thinned. Enclosures were subjected to 10 years of Deer browsing, 1980-90, at the 4 simulated densities. I conducted bird counts in 1991. Varying Deer density had no effect (P > 0.1) on ground- or upper canopy-nesting songbirds or their habitat, but species richness of intermediate canopy-nesting songbirds declined 27% (P = 0.01) and abundance declined 37% (P = 0.002) between lowest and highest Deer densities. I did not observe the eastern wood pewee (Contopus virens), indigo bunting (Passerina cyanea), least flycatcher (Empidonax minimus), yellowbilled cuckoo (Coccyzus americanus), or cerulean warbler (Dendroica cerulea) at densities >7.9 Deer /km2, and the eastern phoebe (Sayomis phoebe), and American robin (Turdus migratorius) were not observed at 24.9 Deer/km2. Threshold Deer density for effect on habitat and songbirds within managed (100-yr rotation) forests was between 7.9 and 14.9 Deer/km2.
K Hollis - One of the best experts on this subject based on the ideXlab platform.
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high prevalence of antibodies to neospora caninum in white tailed Deer odocoileus virginianus
International Journal for Parasitology, 1999Co-Authors: J P Dubey, K Hollis, Stephane Romand, P Thulliez, O C H Kwok, L Hungerford, C Anchor, D EtterAbstract:Serum samples of 400 white-tailed Deer (Odocoileus virginianus) from 16 preserves in northeastern Illinois were tested for Neospora caninum antibodies in the N. caninum agglutination test using mouse-derived N. caninum tachyzoites and mercaptoethanol. Antibodies were found in 162 Deer with titres of 1:40 (47 Deer), 1:80 (32 Deer), 1:160 (17 Deer), 1:200 (eight Deer), 1:400 (19 Deer), 1:800 (17 Deer) and ≥1:1600 (22 Deer). There were no significant differences in prevalence between age or sex of the Deer. The high prevalence of N. caninum infection in Deer is consistent with a sylvatic cycle of N. caninum.
C Anchor - One of the best experts on this subject based on the ideXlab platform.
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high prevalence of antibodies to neospora caninum in white tailed Deer odocoileus virginianus
International Journal for Parasitology, 1999Co-Authors: J P Dubey, K Hollis, Stephane Romand, P Thulliez, O C H Kwok, L Hungerford, C Anchor, D EtterAbstract:Serum samples of 400 white-tailed Deer (Odocoileus virginianus) from 16 preserves in northeastern Illinois were tested for Neospora caninum antibodies in the N. caninum agglutination test using mouse-derived N. caninum tachyzoites and mercaptoethanol. Antibodies were found in 162 Deer with titres of 1:40 (47 Deer), 1:80 (32 Deer), 1:160 (17 Deer), 1:200 (eight Deer), 1:400 (19 Deer), 1:800 (17 Deer) and ≥1:1600 (22 Deer). There were no significant differences in prevalence between age or sex of the Deer. The high prevalence of N. caninum infection in Deer is consistent with a sylvatic cycle of N. caninum.
