Testing the effectiveness of capture mark recapture population estimation techniques using a computer simulation with known population size

Rees, Samuel G and Goodenough, Anne E and Hart, Adam G and Stafford, Richard (2011) Testing the effectiveness of capture mark recapture population estimation techniques using a computer simulation with known population size. Ecological Modelling, 222 (17). pp. 3291-3294. ISSN 03043800

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Abstract

Estimation of small mammal population sizes is important for monitoring ecosystem condition and for conservation. Here, we test the accuracy of standard methods of population size estimation using Capture-Mark-Recapture (CMR) on a simulated population of agents. The use of a computer simulation allows complete control of population sizes and behaviors, thereby avoiding assumptions that may be violated in real populations. We find that the recommended protocol for CMR sampling, using uniformly distributed traps, consistently overestimates population sizes by as much as 100% when studies are conducted over only two trapping periods. More than 20 trapping periods are required before this method, or that of placing traps randomly, gives an accurate estimation of population size (i.e., within a 95% confidence limit of the actual value). Non-random sampling, by placing traps on runways used by small mammals, produces the most accurate, and least variable, estimates of population. However, we show that around 10 trapping periods are still required to produce an accurate population estimate using this method. Given that most real populations do not comply with the ‘ideal’ assumptions made by CMR, we suggest that population estimates based on CMR may be fundamentally flawed, and recommend that protocols for CMR population estimation methods may need revising.

Item Type: Article
Article Type: Article
Uncontrolled Keywords: Capture-Mark-Recapture Population Simulation Small mammal
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QL Zoology
Divisions: Schools and Research Institutes > School of Natural & Social Sciences > Environmental Sciences
Research Priority Areas: Environmental Dynamics & Governance
Depositing User: Anne Goodenough
Date Deposited: 04 May 2016 09:38
Last Modified: 04 May 2016 09:38
URI: http://eprints.glos.ac.uk/id/eprint/3366

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