Publications by authors named "Julian A Tyne"
The expansion of the world's merchant fleet poses a great threat to the ocean's biodiversity. Collisions between ships and marine megafauna can have population-level consequences for vulnerable species. The Endangered whale shark (Rhincodon typus) shares a circumglobal distribution with this expanding fleet and tracking of movement pathways has shown that large vessel collisions pose a major threat to the species.
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- Habitat selection in wildlife is affected by habitat quality and human activities, which can negatively impact their behavior.
- A study on spinner dolphins in Hawaii found they are frequently exposed to human activities, spending a significant amount of their daytime resting, mainly in sheltered bays.
- Despite high exposure levels, resting behaviors might be altered without showing immediate effects; chronic exposure could lead to serious long-term consequences for the dolphin population.
The soundscapes of four bays along the Kona Coast of Hawaii Island were monitored between January 2011 and March 2013. Equivalent, unweighted sound pressure levels within standard 1/3rd-octave bands (dB re: 1μPa) were calculated for each recording. Sound levels increased at night and were lowest during the daytime when spinner dolphins use the bays to rest.
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- Selective forces influence wildlife behavior, helping them maximize fitness by strategically timing and spacing their activities, especially in response to human impacts.
- Spinner dolphins show a clear pattern of behavioral partitioning, foraging primarily at night, while resting during the day, suggesting they may be less adaptable to human disturbances compared to other cetaceans.
- Increased human activities in Hawaii have significantly impacted spinner dolphin populations, with recent estimates showing declines, highlighting the need for targeted conservation efforts to protect this species.
Effective decision making to protect coastally associated dolphins relies on monitoring the presence of animals in areas that are critical to their survival. Hawaiian spinner dolphins forage at night and rest during the day in shallow bays. Due to their predictable presence, they are targeted by dolphin-tourism.
View Article and Find Full Text PDFThe bycatch of small cetaceans in commercial fisheries is a global wildlife management problem. We used data from skippers' logbooks and independent observers to assess common bottlenose dolphin (Tursiops truncatus) bycatch patterns between 2003 and 2009 in the Pilbara Trawl Fishery, Western Australia. Both datasets indicated that dolphins were caught in all fishery areas, across all depths and throughout the year.
View Article and Find Full Text PDFReliable population estimates are critical to implement effective management strategies. The Hawai'i Island spinner dolphin (Stenella longirostris) is a genetically distinct stock that displays a rigid daily behavioural pattern, foraging offshore at night and resting in sheltered bays during the day. Consequently, they are exposed to frequent human interactions and disturbance.
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