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dc.contributor.authorNewman, Jamie
dc.contributor.authorFletcher, David
dc.contributor.authorMoller, Henrik
dc.contributor.authorMcKechnie, Sam
dc.contributor.authorScott, Darren
dc.contributor.authorBragg, Corey
dc.identifier.citationNewman, J., Fletcher, D., Moller, H., McKechnie, S., Scott, D., & Bragg, C. (2009). Estimates of productivity and detection probabilities of breeding attempts in the sooty shearwater (Puffinus griseus), a burrow-nesting petrel. Wildlife Research, 36(2), 159–168. doi:10.1071/WR06074en
dc.description.abstractMonitoring of breeding success in burrow-nesting seabirds is problematic, owing to the difficulties of detecting occupants in complex burrow systems. We summarise 6 years of monitoring the breeding success of sooty shearwater (tītī, muttonbird, Puffinus griseus) on two southern New Zealand islands, The Snares and Whenua Hou, with a portable infrared camera system. Breeding attempts were monitored three times during the breeding season, i.e. egg laying, hatching and fledging. Overall breeding success was calculated in two stages. First, we estimated breeding success for each island–site–year combination with a model that allowed for imperfect detection of an egg or chick and accounted for the proportion of the breeding season that was covered by monitoring. The resulting estimates for each island were then analysed with a linear model, to provide a single estimate for that island. Breeding success was found to be highly variable and non-synchronous between islands, with the average proportion of eggs successfully fledging on The Snares (0.35, 0.20–0.52; mean and 95% creditable interval) being considerably lower and more variable than that on Whenua Hou (0.76, 0.70–0.82). Probability of detecting a breeding attempt was higher on The Snares whereas correcting for the proportion of the season monitored had a variable effect, reducing The Snares and Whenua Hou estimates by 27% and 7% respectively. The implications of these findings with respect to the demographic modelling of burrow-nesting species are discussed.en_NZ
dc.relation.ispartofWildlife Researchen_NZ
dc.subjectShearwater breeding successen_NZ
dc.subjectintermittent breedingen_NZ
dc.subjectobserver erroren_NZ
dc.titleEstimates of productivity and detection probabilities of breeding attempts in the sooty shearwater (Puffinus griseus), a burrow-nesting petrelen_NZ
dc.typeJournal Articleen_NZ
otago.schoolCentre for Sustainabilityen_NZ
otago.openaccessAbstract Onlyen_NZ
dc.rights.statementCopyright CSIRO 2009en_NZ
dc.description.refereedPeer Revieweden_NZ
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