2024-03-28T21:44:29Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/953492022-03-24T15:38:46Zcom_10261_132com_10261_8col_10261_385
Population abundance, size structure and sex-ratio in an insular lizard
Tenan, Simone
Rotger, Andreu
Igual, José Manuel
Moya, Oscar
Royle, J. Andrew
Tavecchia, Giacomo
Population size
Data augmentation
Capture-mark-recapture
Individual covariates
Insular lizard
Sex-ratio
Estimating population size and understanding its variation is a fundamental, yet complicated, aim of many ecological studies. We considered the problem of estimating spring and autumn population abundance, size-dependent population structure and sex-ratio of the endemic Balearic Lizard, Podarcis lilfordi from a three occasions capture-recapture study. We used a Bayesian formulation of individual covariate models to incorporate individual sex, size and trap-response. We first considered a set of simulated data with a medium-to-low probability of recapture and individual recapture heterogeneity to evaluate potential problems in model fitting and selection. Results from simulated data indicated a low performance in parameter estimation and model selection when probability of detection was low (0.15-0.30). We found a negative permanent trap response and a positive effect of size on detection probability in the spring survey but not in the autumn one. The estimated mean densities varied from about 800 to 1000lizardsha-1, a high value when comparing with mainland lizard populations. The observed increase in abundance was probably due to a drop in territorial behaviour and the immigration of females into the area sampled. As a consequence, sex-ratio changed from nearly even in June (mean posterior, 95%CRI; 0.928, 0.676-1.167) to a female-skewed population in October (0.612, 0.478-0.772). © 2013 Elsevier B.V.
2014-04-10T10:58:37Z
2014-04-10T10:58:37Z
2013
2014-04-10T10:58:37Z
artículo
Ecological Modelling 267: 39-47 (2013)
http://hdl.handle.net/10261/95349
10.1016/j.ecolmodel.2013.07.015
eng
http://dx.doi.org/10.1016/j.ecolmodel.2013.07.015
closedAccess
Elsevier