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Marine Ecology Progress Series

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MEPS 619:1-15 (2019)  -  DOI:

Broad-scale movements of juvenile white sharks Carcharodon carcharias in eastern Australia from acoustic and satellite telemetry

B. D. Bruce1, D. Harasti2, K. Lee2,3,4, C. Gallen2, R. Bradford1,*

1CSIRO Oceans and Atmosphere, Hobart, TAS 7004, Australia
2Fisheries Research, NSW Department of Primary Industries, Nelson Bay, NSW 2315, Australia
4Sydney Institute of Marine Science, Mosman, NSW 2088, Australia
4Department of Biological Sciences, Macquarie University, North Ryde, NSW 2113, Australia
*Corresponding author:

ABSTRACT: The advent of electronic tagging has seen vast advances in our understanding of marine top-order predator movements over broad spatial scales. However, most studies are restricted to short temporal scales. We examined movements of 43 juvenile white sharks Carcharodon carcharias (1.7-3.2 m total length) in eastern Australia via satellite-linked radio tags (SLRTs) and internally implanted long-life acoustic tags, the latter monitored by receiver arrays spanning a continental scale and across international boundaries. Although SLRT data were restricted to less than 2 yr, the study registered approximately 182000 detections of acoustic-tagged white sharks on 287 receivers over 7 yr, with individual tracking periods of up to 5 yr. Data reveal complex movement patterns over distances of thousands of kilometres and 13° of latitude, with sharks ranging from the southern Great Barrier Reef, Queensland, to Tasmania and across the Tasman Sea to New Zealand. Sharks showed a variety of movement patterns, including annual fidelity to spatially restricted nursery areas, directed seasonal coastal movements, intermittent areas of temporary nearshore residency and offshore excursions into the Tasman Sea. Movements east to west through Bass Strait were restricted, further supporting the 2-population model for the species in Australian waters. The latitudinal range of movements increased with years at liberty, and female sharks were more commonly encountered than males in nearshore waters. Long-term monitoring of acoustic-tagged sharks via data sharing through collaborative national and international receiver arrays offers future promise to examine movements over periods relevant to ontogenetic changes and at scales providing context to interannual variability.

KEY WORDS: Nursery area · Migration · Australia’s Integrated Marine Observing System · IMOS

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Cite this article as: Bruce BD, Harasti D, Lee K, Gallen C, Bradford R (2019) Broad-scale movements of juvenile white sharks Carcharodon carcharias in eastern Australia from acoustic and satellite telemetry. Mar Ecol Prog Ser 619:1-15.

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