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Distribution, seasonal movements and habitat utilisation of an endangered shark, Glyphis glyphis, from northern Australia

2017; Inter-Research; Volume: 573; Linguagem: Inglês

10.3354/meps12200

1616-1599

BJ Lyon, Ross G. Dwyer, Richard D. Pillans, Hamish A. Campbell, Craig E. Franklin,

Fish Biology and Ecology Studies

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 573:203-213 (2017) - DOI: https://doi.org/10.3354/meps12200 Distribution, seasonal movements and habitat utilisation of an endangered shark, Glyphis glyphis, from northern Australia B. J. Lyon1, R. G. Dwyer1,*, R. D. Pillans2, H. A. Campbell3, C. E. Franklin1 1School of Biological Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia 2CSIRO, Oceans and Atmosphere, Dutton Park, Queensland 4102, Australia 3Research Institute for the Environment and Livelihoods, School of the Environment, Charles Darwin University, Darwin, Northern Territory 0909, Australia *Corresponding author: ross.dwyer@uq.edu.au ABSTRACT: Euryhaline and freshwater elasmobranchs are considered amongst the most threatened groups of aquatic animals. The speartooth shark Glyphis glyphis has a distribution restricted to estuaries and rivers in northern Australia and Papua New Guinea. Due to this restricted range and threats from fisheries and habitat degradation, the species is currently listed as Endangered on the IUCN Red List. To inform and direct conservation management actions, we investigated the distribution and habitat utilisation of G. glyphis in the Wenlock River system, Queensland, Australia. Using acoustic transmitters and a network of fixed underwater acoustic hydrophones, the movements of 40 sharks (63 to 131.5 cm total length) were tracked over 22 mo, throughout 137 km of river and adjacent coastal embayment. Three broad zones were utilised by tagged G. glyphis, comprising a lower (0 to 23 km), mid (20 to 50 km) and upper (35 to 68 km upstream) estuary zone. Individual-based occupancy of these zones changed with seasonal changes in freshwater inflow. These results provide new insight into the habitat requirements of G. glyphis, the importance of natural eco-hydrological flows for the species, and the significance of the Wenlock River as a G. glyphis natal area. KEY WORDS: Elasmobranch · Acoustic telemetry · Spatial ecology · Tropical tidal river · Conservation · Fisheries · River shark · Glyphis · Euryhaline Full text in pdf format PreviousNextCite this article as: Lyon BJ, Dwyer RG, Pillans RD, Campbell HA, Franklin CE (2017) Distribution, seasonal movements and habitat utilisation of an endangered shark, Glyphis glyphis, from northern Australia. Mar Ecol Prog Ser 573:203-213. https://doi.org/10.3354/meps12200 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 573. Online publication date: June 21, 2017 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2017 Inter-Research.