Estimating abundance of introduced Chinese muntjac Muntiacus reevesi and native roe deer Capreolus capreolus using portable thermal imaging equipment
Article first published online: 31 AUG 2007
Volume 37, Issue 3, pages 246–254, July 2007
How to Cite
HEMAMI, M. R., WATKINSON, A. R., GILL, R. M. A. and DOLMAN, P. M. (2007), Estimating abundance of introduced Chinese muntjac Muntiacus reevesi and native roe deer Capreolus capreolus using portable thermal imaging equipment. Mammal Review, 37: 246–254. doi: 10.1111/j.1365-2907.2007.00110.x
- Issue published online: 31 AUG 2007
- Article first published online: 31 AUG 2007
- Submitted 4 July 2006; returned for revision 17 January 2007; revision accepted 22 June 2007.
- abundance estimation;
- deer management;
- distance sampling;
- pellet-group counts
- 1Managing the conservation impacts of deer requires knowledge of their numbers. However, estimating densities in forested areas is problematic, with pellet-group-based methods subject to error and uncertainty in estimating defecation and decay rates in addition to sampling variance. Use of thermal imaging equipment allows direct census by distance sampling.
- 2Densities of introduced Chinese muntjac Muntiacus reevesi and native roe deer Capreolus capreolus were estimated in 12.8 km2 of conifer forest in eastern England by thermal imaging distance transects. Estimated density of introduced muntjac (±95% confidence intervals [CI]: 20 ± 8 km−2) exceeded that of native roe deer (16 ± 6 km−2); 95% CI of c. 40% were achieved in 10 days of fieldwork.
- 3Density estimates were not sensitive to the number of width bands applied during analysis. Detectability functions differed, with narrower effective strip widths (ESW) for muntjac (74 m) than roe deer (123 m). Thus, it is important to discriminate between species when censusing mixed assemblages. Detectability and ESW also differed among plantation growth stages. Stratification by habitat may therefore improve accuracy of density estimates but would require additional survey effort.