ORCID Profile
0000-0003-0678-1197
Current Organisation
Murdoch University
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Publisher: Wiley
Date: 2008
DOI: 10.1890/07-0315.1
Abstract: The formulation of conservation policy for species that are rare and migratory requires broad cooperation to ensure that adequate levels of standardized data collection are achieved and that the results of local analyses are comparable. Estimates of apparent survival rate, relative change in abundance, and proportions of newly marked and returning in iduals can inform local management decisions while highlighting corresponding changes at other linked research stations. We have applied computer-assisted photo-identification and mark-recapture population modeling to whale sharks Rhincodon typus at Ningaloo Marine Park (NMP), Western Australia, to create a baseline trend for comparison with other regional aggregations of the species. We estimate several ecological parameters of interest, including an average apparent survival rate of 0.55 yr(-1) for sharks newly marked (new) and 0.83 yr(-1) for sharks captured in multiple seasons (philopatric). The average proportion of philopatric sharks is found to be 0.65 of the total population, and we derive an average population growth rate of 1.12 yr(-1) for them. Our analysis uncovered significant heterogeneity in capture and survival probabilities in this study population our chosen model structures and data analysis account for these influences and demonstrate a good overall fit to the time-series data. The results show good correspondence between capture probability and an available measure of recapture effort, suggesting that unmodeled systematic effects contribute insignificantly to the model fits. We find no evidence of a decline in the whale shark population at NMP, and our results provide metrics of value to their future management. Overall, our study suggests an effective approach to analyzing and modeling mark-recapture data for a rare species using computer-assisted photo-identification and opportunistic data collection from ecotourism to ensure the quality and volume of data required for population analysis.
Publisher: Elsevier BV
Date: 09-2022
Publisher: Wiley
Date: 10-2016
DOI: 10.1002/FEE.1418
Publisher: Informa UK Limited
Date: 03-2000
Publisher: Inter-Research Science Center
Date: 23-12-2008
DOI: 10.3354/AB00104
Publisher: Springer Science and Business Media LLC
Date: 27-03-2017
Publisher: Wiley
Date: 2010
DOI: 10.1002/JTR.742
Publisher: Inter-Research Science Center
Date: 05-08-2010
DOI: 10.3354/ESR00300
Publisher: Elsevier BV
Date: 04-2009
Publisher: Springer Science and Business Media LLC
Date: 16-09-2015
Publisher: Oxford University Press (OUP)
Date: 29-11-2017
Publisher: Elsevier BV
Date: 03-2007
Publisher: Wiley
Date: 22-03-2012
DOI: 10.1111/J.1095-8649.2012.03250.X
Abstract: This study gives an account of spatial and temporal distribution of whale shark Rhincodon typus catch events in China on the basis of historical records and information obtained from interviews with fishing industry stakeholders. A total of 186 R. typus were recorded with key harvest areas identified as in Hainan and Zhejiang, and the peak catching seasons were May to June and September to October. Aspects of the R. typus trade are discussed, including products, markets and the process. The results suggest that R. typus is increasingly becoming a targeted resource in China as a consequence of fierce competition for large shark fins and an emerging local market for consumption of all body parts. Current obstacles and potential measures for sustainable exploitation and trade of R. typus are discussed.
Publisher: Wiley
Date: 23-11-2005
Publisher: Inter-Research Science Center
Date: 08-04-2009
DOI: 10.3354/ESR00186
Publisher: Wiley
Date: 10-10-2017
DOI: 10.1111/JFB.13461
Abstract: Whale sharks Rhincodon typus were monitored via acoustic transmitters at the northern end of Western Australia's Ningaloo Marine Park to establish the extent to which the species inhabits the region beyond the whale-shark ecotourism industry season, which usually extends from March to August in each year. Despite the vast majority (c. 98%) of photographic submissions of R. typus from Ningaloo Reef being between March and August, acoustic detections from the tagged R. typus at Ningaloo were recorded in all months of the year, but do not preclude the occurrence of extended absences. It is concluded that as a species, R. typus occurs year round at Ningaloo, where it generally remains in close proximity to the reef edge, but that some in iduals move outside of the detection range of the array for extended periods.
Publisher: Wiley
Date: 29-08-2017
DOI: 10.1111/DDI.12618
Publisher: Informa UK Limited
Date: 03-2009
Publisher: Wiley
Date: 24-11-2011
Publisher: Elsevier BV
Date: 07-2014
Publisher: Informa UK Limited
Date: 07-2010
Publisher: Springer Science and Business Media LLC
Date: 25-07-2013
Publisher: CSIRO Publishing
Date: 2016
DOI: 10.1071/PC15045
Abstract: Whale sharks (Rhincodon typus) seasonally aggregate at Western Australia’s Ningaloo Reef in the austral autumn and winter, but their occurrence beyond this region during spring and summer remains elusive. The aggregation at Ningaloo Reef coincides with a pulse of productivity following mass coral spawning in early autumn, with the population during this period dominated by juveniles that amass for feeding purposes. To investigate their movement patterns beyond Ningaloo Reef, whale sharks were fitted with SPOT (n = 13) or SPLASH (n = 1) tags between April and September (2010–14). Tagged whale sharks ranged in total length from 3 to 9 m. Each whale shark was also photographed for its subsequent identification using Wildbook for Whale Sharks, and their years of residency at Ningaloo Reef determined. Temporal and spatial observations of whale shark sightings were also determined through the conducting of interviews with people throughout 14 coastal towns along the Western Australian coastline, as well as through historical sightings and the Wildbook database. Satellite tracking revealed that all sharks remained relatively close to the Western Australian coast, travelling a mean minimum distance of 1667 (±316, s.e.) km. Public reports, coupled with satellite tracking, demonstrated that whale sharks inhabit most of the Western Australian coast (from 35°S to 12°S), and that seasonal migrations beyond Ningaloo Reef may be to the north or south and may similarly be associated with areas of increased productivity.
No related grants have been discovered for Bradley NORMAN.