Evaluating Differences in Harvest Data Used in the Sex‐Age‐Kill Deer Population Model

Mattson, Kimberly M.; Moritz, William E.

doi:10.2193/2006-219

Cited by 14 publications

(11 citation statements)

References 9 publications

(8 reference statements)

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“…We modeled increases in hunter harvest as multiples of current harvest rates in DMU 452, estimated to be approximately 40% of antlered (yearling and adult bucks) and 16% of antlerless (fawns of both sexes, and yearling and adult does) deer per year by the sex‐age‐kill method (Mattson and Moritz ). We evaluated 4 scenarios: 1) a 25% increase in both antlered and antlerless harvest; 2) a 50% increase in both antlered and antlerless harvest; 3) a doubling of both antlered and antlerless harvest; and 4) a doubling of antlered harvest and a tripling of antlerless harvest.…”

Section: Methodsmentioning

confidence: 99%

Forecasting eradication of bovine tuberculosis in Michigan white‐tailed deer

et al. 2014

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Bovine tuberculosis (bTB) caused by Mycobacterium bovis infection in Michigan white‐tailed deer (Odocoileus virginianus) has proven resistant to current management practices. The Michigan Department of Natural Resources (MDNR) is faced with managing a protracted bTB outbreak with shrinking economic resources, its initial control strategies approaching, or having reached, the limits of their effectiveness. Planning tools are needed to project the outbreak's future course and forecast the likely outcomes of proposed controls. We describe development of a spatially explicit, individual‐based stochastic simulation model of bTB in Michigan white‐tailed deer. We sought to 1) characterize whether eradication of bTB is possible by increasing hunter harvest or via vaccination, and how long it is likely to take to achieve eradication; 2) characterize the effect of concurrent deer baiting; and 3) assess the effect of baiting on the probability of bTB establishment in uninfected areas. Simulations indicated that current MDNR management strategies are unlikely to eradicate bTB from the core outbreak area's deer population within the next 30 years. A 50–100% increase (over current rates) of both antlered and antlerless deer harvest was required to achieve eradication if baiting was occurring, compared to only a 50% increase in harvest required if baiting was eliminated. Vaccination strategies required frequent application and high exposure rates (>90%) to achieve eradication, which baiting delayed. Simulations indicated that if bTB was eradicated from the core outbreak area, a single infected deer introduced into the area would be 8 times more likely to re‐establish bTB if baiting was occurring. The ability to forecast likely outcomes of disease management can be critical for wildlife managers to assess whether specific strategies are likely to be successful. Because current policy appears unlikely to achieve the stated goal of eradicating bTB from Michigan in the foreseeable future, reorienting the bTB program from eradication to controlling geographic spread and transmission to cattle may be more realistic goals. Spatial models such as ours are ideally suited to investigating spatial heterogeneity of disease transmission, and how transmission is influenced by aggregating factors such as baiting or supplemental feeding. © 2014 The Wildlife Society.

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Section: Methodsmentioning

confidence: 99%

Forecasting eradication of bovine tuberculosis in Michigan white‐tailed deer

et al. 2014

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“…Notably, vaccination is not justified by negative population‐level effects of bovine TB on white‐tailed deer. White‐tailed deer are abundant: the estimated population in Michigan is 1.7 million (range 1.69–1.97 million, 2011–2013; Michigan Department of Natural Resources, unpublished data; estimation via sex–age kill; Mattson & Moritz ). Population‐level TB mortality is minimal, and white‐tailed deer are of economic and cultural, rather than conservation, significance (O'Brien et al.…”

Section: Vaccinationmentioning

confidence: 99%

Open questions and recent advances in the control of a multi‐host infectious disease: animal tuberculosis

2015

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Animal tuberculosis (TB) control is globally important for public health, economics and conservation. Wildlife species are often part of the Mycobacterium tuberculosis complex (MTC) maintenance community, complicating TB control attempts. We describe the current knowledge on global TB distribution and the significance of wildlife hosts; identify insufficiently known aspects of host pathology, ecology and epidemiology; present selected time series in wildlife TB; and summarize ongoing research on TB control, providing additional insight on vaccination. Six specific research needs are identified and discussed, namely: 1) complete the world map of wildlife MTC reservoirs and describe the structure of each local MTC host community; 2) identify the origin and behaviour of generalized diseased individuals within populations, and study the role of factors such as co‐infections, re‐infections and individual condition on TB pathogenesis; 3) quantify indirect MTC transmission within and between species; 4) define and harmonize wildlife disease monitoring protocols, and apply them in a way that allows proper population and prevalence trend comparisons in both space and time; 5) carry out controlled and replicated wildlife TB control experiments using single intervention tools; 6) analyse cost‐efficiency and consider knowledge transfer aspects in promising intervention strategies. We believe that addressing these six points would push ahead our capacities for TB control. A remaining question is whether or not interventions on wildlife TB are at all justified. The answer depends on the local circumstances of each TB hotspot, and is likely to evolve during our collective progress towards TB control in livestock and in wildlife.

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“…Wildlife managers often use indices of abundance calculated using sex and age ratios derived from harvest and mortality data (Pelton 2003, Timmins 2004, Garshelis and Hristienko 2006, Mattson and Moritz 2008). Although estimating abundance using hunter‐harvest and mortality data is less costly than live capture or telemetry studies, the reliability of these indices has been criticized (Miller 1989, Kane and Litvaitis 1992, Koehler and Pierce 2005).…”

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confidence: 99%

Genetic mark–recapture population estimation in black bears and issues of scale

et al. 2011

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Abundance estimates for black bears (Ursus americanus) are important for effective management. Recently, DNA technology has resulted in widespread use of noninvasive, genetic capture–mark–recapture (CMR) approaches to estimate populations. Few studies have compared the genetic CMR methods to other estimation methods. We used genetic CMR to estimate the bear population at 2 study sites in northern New Hampshire (Pittsburg and Milan) in 2 consecutive years. We compared these estimates to those derived from traditional methods used by the New Hampshire Fish and Game Department (NHFG) using hunter harvest and mortality data. Density estimates produced with genetic CMR methods were similar both years and were comparable to those derived from traditional methods. In 2006, the estimated number of bears in Pittsburg was 79 (95% CI = 60–98) corresponding to a density of 15–24 (95% CI) bears/100 km2; the 2007 estimate was 83 (95% CI = 67–99; density = 16–24 bears/100 km2). In 2006, the estimated number of bears in Milan was 95 (95% CI = 74–117; density = 16–25 bears/100 km2); the 2007 estimate was 96 (95% CI = 77–114; density = 17–25 bears/100 km2). We found that genetic CMR methods were able to identify demographic variation at a local scale, including a strongly skewed sex ratio (2 M:1 F) in the Milan population. Genetic CMR is a useful tool for wildlife managers to monitor populations of local concern, where abundance or demographic characteristics may deviate from regional estimates. Future monitoring of the Milan population with genetic CMR is recommended to determine if the sex ratio bias continues, possibly warranting a change in local harvest regimes. © 2011 The Wildlife Society.

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Evaluating Differences in Harvest Data Used in the Sex‐Age‐Kill Deer Population Model

Cited by 14 publications

References 9 publications

Forecasting eradication of bovine tuberculosis in Michigan white‐tailed deer

Forecasting eradication of bovine tuberculosis in Michigan white‐tailed deer

Open questions and recent advances in the control of a multi‐host infectious disease: animal tuberculosis

Genetic mark–recapture population estimation in black bears and issues of scale

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