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Bottlenose dolphin abundance in coastal Moreton Bay 2000
Citatie
Lukoschek, V. and B.L. Chilvers. 2008. A robust baseline for bottlenose dolphin abundance in coastal Moreton Bay: A large carnivore living in a region of escalating anthropogenic impacts. Wildlife Research. 35(7):593-605. https://marineinfo.org/id/dataset/3623
Contact:
Lukoschek, Vimoksalehi Beschikbaarheid:
![]() Beschrijving
We estimated abundances of bottlenose dolphins in central eastern Moreton Bay (350 km²) using two commonly used abundance estimation methods for cetaceans: photo-identification mark-recapture and line-transect surveys. meer
Marine megafauna populations in coastal waters are increasingly threatened by anthropogenic impacts. Moreton Bay, a large embayment in south-east Queensland, lies adjacent to one of the fastest growing regions in Australia and has a resident population of bottlenose dolphins, Tursiops aduncus. Evaluation of the effectiveness of any proposed management strategy requires robust population abundance estimates. We estimated abundances of bottlenose dolphins in central eastern Moreton Bay (350 km²) using two commonly used abundance estimation methods for cetaceans: photo-identification mark-recapture and line-transect surveys. Mark-recapture data were analyzed in CAPTURE using a model that allowed capture probabilities to vary between sampling events and between individuals. Based on an estimated 76% of the population identifiable photographically, total abundance estimates were 673 ± 130 s.e. (1997) and 818 ± 152 s.e. (1998). Line-transect data, analyzed using DISTANCE, gave an abundance estimate of 407 ± 113.5 s.e. (2000). These abundance estimates are large compared with many other coastal bottlenose dolphin populations. The line-transect surveys comprised a pilot study, and the lower line-transect abundance estimate is probably best attributable to methodological issues. In particular, smaller mean group size was estimated for the line-transects surveys (2.85 ± 0.29 s.e.) than the mark-recapture surveys (4.87 ± 0.39 s.e., 1997; 5.78 ± 0.73 s.e., 1998), and line-transect group sizes were probably underestimated. In addition, the line-transect detection probability (g(o)) was assumed to be one but was almost certainly less than one. However, the possibility of an actual decline in population size cannot be ruled out. Coefficients of variation (CV) were lower for mark-recapture than for line-transect surveys, however, CVs of line-transect estimates could be lowered through improved survey design. We evaluated the power of these surveys to detect trends in potential population declines for bottlenose dolphins in Moreton Bay and make recommendations for ongoing monitoring strategies. Effort data do not include date/time. Scope Thema's: Biologie > Zoogdieren Kernwoorden: Marien/Kust, I, Pacific, ISEW, Australia, Queensland, Moreton Bay, Tursiops Gervais, 1855 Geografische spreiding I, Pacific [Marine Regions] ISEW, Australia, Queensland, Moreton Bay [Marine Regions] Spreiding in de tijd
8 Januari 2000 - 8 November 2000 Taxonomic coverage
Tursiops Gervais, 1855 [WoRMS]
Bijdrage door
University of California, Irvine, meer, data eigenaar
Gerelateerde datasets
Gepubliceerd in: OBIS-SEAMAP: Spatial Ecological Analysis of Megavertebrate Populations, meer
Publicatie
Gebaseerd op deze dataset
Lukoschek, V.; Chilvers, L. (2008). A robust baseline for bottlenose dolphin abundance in coastal Moreton Bay: a large carnivore living in a region of escalating anthropogenic impacts. Wildl. Res. 35(7): 593-605. http://dx.doi.org/10.1071/WR07021, meer
URL's
Dataset informatie: Dataset status: Afgelopen
Data type: Data
Data oorsprong: Onderzoek
Metadatarecord aangemaakt: 2012-11-28
Informatie laatst gewijzigd: 2012-11-28
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