Journal article
Morphological differences between coastal bottlenose dolphin (Tursiops aduncus) populations identified using non-invasive stereo-laser photogrammetry
Scientific Reports, Vol.9(1)
2019
Abstract
Obtaining morphometric data on free-ranging marine megafauna is difficult, as traditional methods rely on post-mortem or live-capture techniques. We linked stereo-laser photogrammetry with long-term demographic data to compare length-at-age (LaA) growth curves of two well-studied populations of Indo-Pacific bottlenose dolphins (Tursiops aduncus) in south-western (SW) and Shark Bay (SB), mid-western Australia. First, we determined the relationship between total length (TL) and blowhole-to-dorsal fin (BH-DF) length from post-mortem subjects (R2 = 0.99, n = 12). We then predicted TL from laser-derived BH-DF measurements of 129 and 74 known-age individuals in SW and SB, respectively. Richards growth models best described our LaA data. While birth length (103–110 cm) was similar between study regions, TL estimates at 1, 3, 12, and 25 years differed significantly (p < 0.001). Asymptotic length of adult males (SW = 246 cm, SB = 201 cm) and females (SW = 244 cm, SB = 200 cm) also differed significantly. Morphotypic variations likely reflect regional adaptations to local water temperatures, with the temperate SW having cooler waters than sub-tropical SB. We demonstrate the effectiveness of a non-invasive technique to understand ecological, demographic and life-history characteristics of long-lived marine megafauna, which are critical parameters for informing conservation and management actions.
Details
- Title
- Morphological differences between coastal bottlenose dolphin (Tursiops aduncus) populations identified using non-invasive stereo-laser photogrammetry
- Authors/Creators
- M. van Aswegen (Author/Creator)F. Christiansen (Author/Creator)J. Symons (Author/Creator)J. Mann (Author/Creator)K. Nicholson (Author/Creator)K. Sprogis (Author/Creator)L. Bejder (Author/Creator)
- Publication Details
- Scientific Reports, Vol.9(1)
- Publisher
- Springer Nature
- Identifiers
- 991005545191107891
- Copyright
- © 2019 Springer Nature Publishing AG
- Murdoch Affiliation
- School of Environmental and Conservation Sciences; Harry Butler Institute
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.35 Zoology & Animal Ecology
- 3.35.796 Marine Mammal Ecology
- Web Of Science research areas
- Zoology
- ESI research areas
- Plant & Animal Science