Raccoon density estimation from camera traps for raccoon rabies management DOI Creative Commons
Amy J. Davis,

Wesley C. Dixon,

Richard B. Chipman

et al.

Journal of Wildlife Management, Journal Year: 2024, Volume and Issue: 89(2)

Published: Nov. 26, 2024

Abstract Density estimation for unmarked animals is particularly challenging, yet density estimates are often necessary effective wildlife management. Raccoons ( Procyon lotor ) the primary terrestrial reservoir Lyssavirus rabies within United States. The raccoon variant (RRVV) actively managed at landscape scales using oral vaccination (ORV) eastern To effectively manage RRVV, it important to know of raccoons appropriately scale ORV baits distributed on landscape. We compared methods estimate densities from camera‐trap data versus more intensive capture‐mark‐recapture (CMR) across 2 land cover types (upland pine and bottomland hardwood) in southeastern States during 2019 2020. evaluated effect alternative camera configurations durations trapping used an N‐mixture model densities, including covariates abundance detection. further different scaling camera‐based counts, with maximum number seen any given image a day best explaining density. Camera‐trap were moderately correlated CMR r = 0.56). However, reliable when classifying category as index inform management (83% correct estimates), although our study fell into lowest classes only. Using cameras reduced bias uncertainty around estimates; however, if ≤6 traps site, line transect approach proved less biased than grid design. Camera should be conducted least 3 weeks accurate population area (<5% bias). show that can assign management‐relevant bins, but studies needed ensure reliability greater range environmental conditions densities.

Language: Английский

Habitat-specific seasonal densities of sympatric raccoons and opossums in the southeastern United States DOI
Jacob E. Hill, Madison L. Miller, Richard B. Chipman

et al.

Journal of Mammalogy, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 29, 2025

Abstract Raccoon and opossum densities have implications for rabies management, but estimates of seasonal both species are lacking rural nonagricultural habitats the southeastern United States, a core portion their geographic range. Consequently, it remains unclear whether 1 limit other, which is possible considering substantial niche overlap. We carried out mark–recapture study raccoons opossums in 4 (bottomland hardwood forest, riparian upland pine isolated wetlands) South Carolina, States (2020 to 2022), combined this with previous data from same (2017 2019) estimate habitat-specific spring fall densities. ranged 5.17 ± 0.96 animals/km2 fall) 1.63 0.83 (upland spring) were on average 19% higher compared spring. Opossum 10.35 1.98 1.11 1.55 divergent patterns among habitats. These low across all other studies likely result resource availability, consistent that minimal anthropogenic influence. observed positive association between raccoon trapping grids, suggesting do not suppress densities, increase increasing availability. Our results can be used inform oral vaccination efforts such as refining bait timing distribution these

Language: Английский

Citations

0
Influence of habitat and baiting strategy on oral rabies vaccine bait uptake by raccoons in the southeastern United States DOI
Jacob E. Hill, Madison L. Miller, Richard B. Chipman

et al.

Applied Animal Behaviour Science, Journal Year: 2024, Volume and Issue: 277, P. 106320 - 106320

Published: June 17, 2024

Language: Английский

Citations

1
Raccoon density estimation from camera traps for raccoon rabies management DOI Creative Commons
Amy J. Davis,

Wesley C. Dixon,

Richard B. Chipman

et al.

Journal of Wildlife Management, Journal Year: 2024, Volume and Issue: 89(2)

Published: Nov. 26, 2024

Abstract Density estimation for unmarked animals is particularly challenging, yet density estimates are often necessary effective wildlife management. Raccoons ( Procyon lotor ) the primary terrestrial reservoir Lyssavirus rabies within United States. The raccoon variant (RRVV) actively managed at landscape scales using oral vaccination (ORV) eastern To effectively manage RRVV, it important to know of raccoons appropriately scale ORV baits distributed on landscape. We compared methods estimate densities from camera‐trap data versus more intensive capture‐mark‐recapture (CMR) across 2 land cover types (upland pine and bottomland hardwood) in southeastern States during 2019 2020. evaluated effect alternative camera configurations durations trapping used an N‐mixture model densities, including covariates abundance detection. further different scaling camera‐based counts, with maximum number seen any given image a day best explaining density. Camera‐trap were moderately correlated CMR r = 0.56). However, reliable when classifying category as index inform management (83% correct estimates), although our study fell into lowest classes only. Using cameras reduced bias uncertainty around estimates; however, if ≤6 traps site, line transect approach proved less biased than grid design. Camera should be conducted least 3 weeks accurate population area (<5% bias). show that can assign management‐relevant bins, but studies needed ensure reliability greater range environmental conditions densities.

Language: Английский

Citations

1