An example of incorporating trap-dependence in capture-recapture models.

The current approach to modelling trap-dependence is compared to the traditional approach and to the model that ignores trap-dependence in a survival analysis of Cory's shearwaters (from [10]). Because there are transient individuals in this data set, two survival values are estimated: φ1, the apparent survival of newly-marked individuals, which is affected by the presence of transients, and φ2, the survival of previously marked individuals. Capture probability p is time-dependent-only in model (φ1,φ2, pt) and time- and trap-dependent in model (φ1,φ2, pt+m). In this last model, trap and time dependencies are additive. This model was fitted with the current approach, which considers trap-awareness states and with the traditional approach as in ([10] Model 5, Table 2), which involves the special preparation of the data detailed in [12]. The 95% confidence intervals are in parentheses.