%0 Report %1 hoffman_estimation_2010 %A Hoffman, W.S. %A Kaufman, G.D. %A Jule, K. %C Agadir, Morocco %D 2010 %K Australia, GROWTH HEMISPHERE, HUMPBACK RATES, RECRUITMENT, SENIORITY, SOUTHERN WHALE, capture-recapture, photo-identification, survival %P 17 %T Estimation of survival , recruitment and realized growth rates of the East Australia humpback population (BS-1) using temporal symmetry models %U http://iwcoffice.org/_documents/sci_com/SC62docs/SC-62-SH14.pdf %X Identifying vital rates within demographic groups is crucial for assessing the status of a species and the extent to which those changes represent a real increase to the overall breeding stock size. Realized growth and survival rates of Breeding Stock E1 humpback whales identified off Hervey Bay Queensland and Eden, New South Wales, Australia (1994 - 2009) were estimated from a photographic capture-mark-recapture study of post-yearling whales. Annual realized growth rate and seniority estimates were derived using Pradel’s temporal symmetry models in the program MARK. A preliminary analysis using Cormack-Jolly-Seber models provided estimates of age-specific survival and detected potential violations of temporal symmetry models. Best fit model estimates of annual adult survival is 0.925 (0.946-0.961) and 0.70 (0.587-0.793) for sub-adults. Average realized growth rates were estimated for post yearling whales 12.4\% (9.3-15.6) and reproductive females 10.7\% (8.4-13.0). These estimates are consistent with findings from other surveys along the east Australian coast and support a high rate of increase for the BS E1 population of humpbacks whales. The relative contribution of survival and recruitment to population rate of change were estimated using the seniority parameter (\$\textbackslashgamma\$) and its complement (1-\$\textbackslashgamma\$). Surviving whales were the largest contributor to population growth for both reproductive females and post-yearling whales: 90.8\% (SE 0.0105) and 86.2\% (SE 0.132), respectively. Depending on the demographics used (reproductive females or post-yearling whales), survival is either 9.9 or 6.3 (respectively) times more important to population growth than recruitment for BS E1 humpbacks. This has strong conservation management implications, and any increased anthropogenic or environmental pressures adversely affecting survivorship will likely slow the recovery of this stock.

@techreport{hoffman_estimation_2010, abstract = {Identifying vital rates within demographic groups is crucial for assessing the status of a species and the extent to which those changes represent a real increase to the overall breeding stock size. Realized growth and survival rates of Breeding Stock E1 humpback whales identified off Hervey Bay Queensland and Eden, New South Wales, Australia (1994 - 2009) were estimated from a photographic capture-mark-recapture study of post-yearling whales. Annual realized growth rate and seniority estimates were derived using Pradel’s temporal symmetry models in the program MARK. A preliminary analysis using Cormack-Jolly-Seber models provided estimates of age-specific survival and detected potential violations of temporal symmetry models. Best fit model estimates of annual adult survival is 0.925 (0.946-0.961) and 0.70 (0.587-0.793) for sub-adults. Average realized growth rates were estimated for post yearling whales 12.4\% (9.3-15.6) and reproductive females 10.7\% (8.4-13.0). These estimates are consistent with findings from other surveys along the east Australian coast and support a high rate of increase for the BS E1 population of humpbacks whales. The relative contribution of survival and recruitment to population rate of change were estimated using the seniority parameter (\${\textbackslash}gamma\$) and its complement (1-\${\textbackslash}gamma\$). Surviving whales were the largest contributor to population growth for both reproductive females and post-yearling whales: 90.8\% (SE 0.0105) and 86.2\% (SE 0.132), respectively. Depending on the demographics used (reproductive females or post-yearling whales), survival is either 9.9 or 6.3 (respectively) times more important to population growth than recruitment for BS E1 humpbacks. This has strong conservation management implications, and any increased anthropogenic or environmental pressures adversely affecting survivorship will likely slow the recovery of this stock.}, added-at = {2017-01-09T13:57:26.000+0100}, address = {Agadir, Morocco}, author = {Hoffman, W.S. and Kaufman, G.D. and Jule, K.}, biburl = {https://www.bibsonomy.org/bibtex/2f8c8e0958a749df8bc8b77239fef0c62/yourwelcome}, institution = {Paper SC/62/SH14 presented to the IWC Scientific Committee, May 2010 (unpublished)}, interhash = {a4c761de0c2bd98c970454bfa62b0d31}, intrahash = {f8c8e0958a749df8bc8b77239fef0c62}, keywords = {Australia, GROWTH HEMISPHERE, HUMPBACK RATES, RECRUITMENT, SENIORITY, SOUTHERN WHALE, capture-recapture, photo-identification, survival}, pages = 17, timestamp = {2017-01-09T14:01:11.000+0100}, title = {Estimation of survival , recruitment and realized growth rates of the {East} {Australia} humpback population ({BS}-1) using temporal symmetry models}, url = {http://iwcoffice.org/_documents/sci_com/SC62docs/SC-62-SH14.pdf}, urldate = {2011-09-20}, year = 2010 }