Details of talk
|Title||Little Penguin banding: Not all that itís cracked up to be|
|Presenter||Leesa Sidhu (University of New South Wales Canberra)|
|Author(s)||Dr Leesa Sidhu|
|Session||Applied Mathematics/Industrial Mathematics|
Tagging is essential for many types of ecological and behavioural studies as it allows the easy identification of previously encountered animals. It is generally assumed that tagging does not affect the fitness of animals being examined and that tags are retained permanently. This talk presents a framework for analysing mark-recapture data arising from studies that use more than one type of tag or multiple tags. It compares the survival probabilities of 2483 penguins marked at Phillip Island, Australia over a seven year period for groups marked with bands, with transponders or with both devices, by considering life history data, and forming the likelihood as the product of the contributions for each group. Life history data from the double-tagged group are used to estimate the tag retention probabilities, and these are incorporated into the likelihood. The talk examines the effects of flipper bands and injected transponders on the apparent survival of adult Little Penguins Eudyptula minor and shows that banding is not all that itís cracked up to be! The design of the study and the method of analysis allow the estimation of tag loss for the first time, and ensure that tag loss does not bias the survival estimates.