Estimating bird abundance: making methods work

Buckland, Stephen T.; Marsden, Stuart J.; Green, Rhys E.

doi:10.1017/s0959270908000294

Cited by 213 publications

(223 citation statements)

References 34 publications

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“…To get an estimate of individual density (Buckland et al 2008), we multiplied this by the estimate of mean group size, 2.81 (2.63 -2.99, 95% CI), based on spotmapping in a four-year behavioral study within 3.4 km² study area ).…”

Section: ~ Poissonmentioning

confidence: 99%

Estimating density of a rare and cryptic high-mountain Galliform species, the Buff-throated Partridge Tetraophasis szechenyii

Xu¹,

Wang²,

Li³

et al. 2016

ACE

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The best model indicated that detection probability was described by covariates of vegetation cover type, week of visit, time of day, and weather with weak effects, and a partridge group was present during a sampling period with a constant probability. The abundance component was accounted for by vegetation association. Abundance was substantially higher in rhododendron shrubs, fir-larch forests, mixed spruce-larch-birch forests, and especially oak thickets than in pine forests. The model predicted a density of 5.14 groups/km², which is similar to an estimate of 4.7 -5.3 groups/km² quantified via an intensive spot-mapping effort.The post-hoc estimate of individual density was 14.44 individuals/km², based on the estimated mean group size of 2.81. We suggest that the method we employed is applicable to estimate densities of Buff-throated Partridges in large areas. Given importance of a mosaic habitat for this species, local logging should be regulated. Despite no effect of the conservation area (sacred) on the abundance of Buff-throated Partridges, we suggest regulations linking the sacred mountain conservation area with the official conservation system because of strong local participation facilitated by sacred mountains in land conservation.

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Section: ~ Poissonmentioning

confidence: 99%

Estimating density of a rare and cryptic high-mountain Galliform species, the Buff-throated Partridge Tetraophasis szechenyii

Xu¹,

Wang²,

Li³

et al. 2016

ACE

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show abstract

“…distance from thresholds or targets) or dynamic (i.e. rates of change towards or away from thresholds or targets) manner (Buckland et al, 2008). Furthermore, assessments with respect to previously identified thresholds can combine both static and dynamic variables, such as in 'Alerts' approaches where sets of quantitative population criteria are used to place species on a "red", "amber" or "green" alert (Eaton et al, 2009).…”

Section: Monitoring Goals and Evaluation Criteriamentioning

confidence: 99%

Optimising survey effort to monitor environmental variables: A case study using New Zealand kiwifruit orchards

MacLeod

Green

Tompkins

et al. 2016

Journal of Environmental Management

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a b s t r a c tEnvironmental monitoring is increasingly used to assess spatial and temporal trends in agricultural sustainability, and test the effectiveness of farm management policies. However, detecting changes in environmental variables is often technically and logistically challenging. To demonstrate how survey effort for environmental monitoring can be optimised, we applied the new statistical power analysis R package simr to pilot survey data. Specifically, we identified the amount of survey effort required to have an 80% chance of detecting specified trends (À1 to À4% pa) in 13 environmental variables on New Zealand kiwifruit orchards within an 11-year period. The variables assessed were related to soil status, agricultural pests (birds), or ecosystem composition (birds). Analyses were conducted on average values (for each orchard and year combination) to provide a consistent scale for comparison among variables. Survey frequency varied from annual (11 surveys) to every 5 years (3 surveys). Survey size was set at either 30, 60, 150 or 300 orchards. In broad terms, we show the power to detect a specified range of trends over an 11-year period in this sector is much higher for 'soil status' than for 'agricultural pest' or 'ecosystem composition'. Changes in one subset of native bird species (nectar-feeders) requiring a particularly high level of relative survey effort to detect with confidence. Monitoring soil status can thus be smaller and less frequent than those which also want to detect changes in agricultural pests or ecosystem composition (with the latter requiring the most effort) but will depend on the magnitude of changes that is meaningful to detect. This assessment thus allows kiwifruit industry in New Zealand to optimise survey design to the desired information, and provides a template for other industries to do likewise. Power analyses are now more accessible through the provision of the simr package, so deploying and integrating them into design and decision-making should be routine to reduce the risk of inefficiencies and opportunity costs.

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“…Distance-sampling, its extensions into capture-mark-recapture (CMR), spatial modeling designs, and other recent refinements (Marques et al 2007, Buckland et al 2008, Thomas et al 2010 are improving estimations of population size and trend (Barbraud et al 2009, Southwell & Low 2009, and streamlining fieldwork programs ). The use of meta-analysis and surrogate taxa offers potential for rapid estimation of key demographic parameters in poorly studied populations (Brooke et al 2010).…”

Section: Population Dynamicsmentioning

confidence: 99%

Research priorities for seabirds: improving conservation and management in the 21st century

Lewison¹,

Oró²,

Godley³

et al. 2012

Endang. Species. Res.

159

136

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Estimating bird abundance: making methods work

Cited by 213 publications

References 34 publications

Estimating density of a rare and cryptic high-mountain Galliform species, the Buff-throated Partridge Tetraophasis szechenyii

Estimating density of a rare and cryptic high-mountain Galliform species, the Buff-throated Partridge Tetraophasis szechenyii

Optimising survey effort to monitor environmental variables: A case study using New Zealand kiwifruit orchards

Research priorities for seabirds: improving conservation and management in the 21st century

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