Dear MARMAM Colleagues,
We are pleased to announce the following publication in Marine Mammal Science:
Kate R. Sprogis, Holly C. Raudino (nee Smith), Robert Rankin, Colin D. MacLeod and Lars Bejder. Home range size of adult Indo-Pacific bottlenose dolphins (Tursiops aduncus)
in a coastal and estuarine system is habitat and sex-specific. Marine Mammal Science.
DOI: 10.1111/mms.12260
Abstract:
This study examined sex-specific differences in home range size of adult Indo-Pacific bottlenose
dolphins off Bunbury, Western Australia. We applied a new
kernel density estimation approach that accounted for physical barriers to movements. A Bayesian mixture model was developed to estimate a sex effect in home range size with latent group partitioning constrained
by association data. A post hoc analysis investigated group partitioning relating to the proportion of time spent in open
vs. sheltered waters.
From 2007-2013, photographic-identification data were collected along boat-based systematic transect lines (n= 586). Analyses focused on adult dolphins of known sex (sighted
≥ 30; n= 22 males and 34 females). The 95% utilization distributions of males varied between 27-187 km2
(x̄ ± SD; 94.8 ± 48.15)
and for females between 20-133 km2
(65.6 ± 30.9). The mixture model indicated a 99% probability that males had larger home ranges than females. Dolphins mostly sighted in open waters had larger home ranges than those in sheltered waters. Home ranges of dolphins
sighted in sheltered waters overlapped with areas of highest human activity. We suggest that sex differences in home ranges are driven by
male mating strategies, and home range size differences between habitats may be influenced by
prey availability and predation risk.
Kind regards,
Kate
Sprogis PhD
Cetacean Research Unit
| School of Veterinary and Life Sciences,
Murdoch University, 90 South
St, Murdoch WA 6150, Australia