Estimating the population size of the endangered white-clawed crayfish Austropotamobius pallipes using mark-recapture at three Special Areas of Conservation (SACS)

2019 ◽  
Vol 119B (2-3) ◽  
pp. 75
Author(s):  
McFarlane ◽  
O'Brien ◽  
Nelson ◽  
Gammell
Keyword(s):  
Population Size ◽  
Mark Recapture ◽  
Austropotamobius Pallipes

The closed-subpopulation method and estimation of population size from mark-recapture and ancillary data

2000 ◽  
Vol 78 (2) ◽  
pp. 320-326 ◽  
Author(s):  
Frank AM Tuyttens
Keyword(s):  
Population Size ◽  
Ancillary Data ◽  
Mark Recapture ◽  
Animal Populations ◽  
Accuracy And Precision ◽  
Population Size Estimates ◽  
Minimum Number ◽  
Flexible Framework ◽  
And Performance ◽  
Better Than

The algebraic relationships, underlying assumptions, and performance of the recently proposed closed-subpopulation method are compared with those of other commonly used methods for estimating the size of animal populations from mark-recapture records. In its basic format the closed-subpopulation method is similar to the Manly-Parr method and less restrictive than the Jolly-Seber method. Computer simulations indicate that the accuracy and precision of the population estimators generated by the basic closed-subpopulation method are almost comparable to those generated by the Jolly-Seber method, and generally better than those of the minimum-number-alive method. The performance of all these methods depends on the capture probability, the number of previous and subsequent trapping occasions, and whether the population is demographically closed or open. Violation of the assumption of equal catchability causes a negative bias that is more pronounced for the closed-subpopulation and Jolly-Seber estimators than for the minimum-number-alive. The closed-subpopulation method provides a simple and flexible framework for illustrating that the precision and accuracy of population-size estimates can be improved by incorporating evidence, other than mark-recapture data, of the presence of recognisable individuals in the population (from radiotelemetry, mortality records, or sightings, for example) and by exploiting specific characteristics of the population concerned.

scholarly journals Genetic mark‐recapture analysis of winter faecal pellets allows estimation of population size in Sage Grouse Centrocercus urophasianus

Ibis ◽  
2019 ◽  
Vol 162 (3) ◽  
pp. 749-765 ◽  
Author(s):  
Jessica E. Shyvers ◽  
Brett L. Walker ◽  
Sara J. Oyler‐McCance ◽  
Jennifer A. Fike ◽  
Barry R. Noon
Keyword(s):  
Population Size ◽  
Centrocercus Urophasianus ◽  
Sage Grouse ◽  
Mark Recapture ◽  
Faecal Pellets

scholarly journals Overcoming the challenges of measuring the abundance of a cryptic macropod: is a qualitative approach good enough?

2014 ◽  
Vol 41 (1) ◽  
pp. 84 ◽  
Author(s):  
Karlene Bain ◽  
Adrian Wayne ◽  
Roberta Bencini
Keyword(s):  
Population Size ◽  
Relative Abundance ◽  
Spatial Scales ◽  
Faecal Pellet ◽  
Survey Method ◽  
Population Abundance ◽  
Mark Recapture ◽  
Survey Technique ◽  
Threatened Taxa ◽  
Activity Indices

Context An understanding of population size and status is necessary for the implementation of appropriate conservation measures to recover threatened taxa. Mark–recapture studies at large spatial scales are impractical and expensive and a rapid survey technique is an attractive option to provide a measure of relative abundance for cryptic species, using indicators of activity. Aims The aim of our study was to use conventional methods for population estimation to calibrate a rapid survey technique for the quokka (Setonix brachyurus) in the southern forests of Western Australia, with a view to providing quantitative outcomes from this widely adopted monitoring approach. Methods We evaluated the accuracy of relative abundances obtained from the rapid survey technique by comparing them with abundance estimates obtained through established methods for the estimation of populations, including web-based mark–recapture and transect-based counts of activity indicators and sightings. Key results The rapid survey technique was effective at determining presence of quokkas but resulted in an over-estimation of population size because of inaccurate assumptions about occupancy and relative abundance of animals. An alternative survey method based on counts of fresh faecal-pellet groups was found to provide a more reliable and practical estimation of population abundance (R2 = 0.97). Conclusions Activity indices can be used to quantify population abundance, but only for indicators of activity that can be detected readily and for which freshness of activity can be determined. Implications Our findings suggest that a rapid survey based on activity indices can be used to evaluate quantitatively the population size of a species that is rare and potentially mobile at a landscape scale. The attraction of these techniques is that they provide a rapid and inexpensive survey option that is potentially applicable to any cryptic and/or threatened species and is practical for resource-constrained land managers.

A Preliminary Estimate of The Apennine Brown Bear Population Size Based on Hair-Snag Sampling and Multiple Data Source Mark–Recapture Huggins Models

Ursus ◽  
2008 ◽  
Vol 19 (2) ◽  
pp. 105-121 ◽  
Author(s):  
Vincenzo Gervasi ◽  
Paolo Ciucci ◽  
John Boulanger ◽  
Mario Posillico ◽  
Cinzia Sulli ◽  
...  
Keyword(s):  
Population Size ◽  
Brown Bear ◽  
Preliminary Estimate ◽  
Mark Recapture ◽  
Multiple Data Source ◽  
Multiple Data ◽  
Data Source ◽  
Apennine Brown Bear

Estimating Population Size of Eurasian Badgers (Meles meles) Using Mark-Recapture and Mark-Resight Data

1999 ◽  
Vol 80 (3) ◽  
pp. 950-960 ◽  
Author(s):  
F. A. M. Tuyttens ◽  
D. W. Macdonald ◽  
E. Swait ◽  
C. L. Cheeseman
Keyword(s):  
Population Size ◽  
Meles Meles ◽  
Mark Recapture
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