Spatio-temporal occurrence patterns of young sharks in tropical coastal waters

Yates, Peter M., Heupel, Michelle R., Tobin, Andrew J., and Simpfendorfer, Colin A. (2015) Spatio-temporal occurrence patterns of young sharks in tropical coastal waters. Estuaries and Coasts, 38 (6). pp. 2019-2030.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1007/s12237-015-995...
 
5
2


Abstract

Understanding spatio-temporal patterns in shark occurrence is critical for assessing the ecological role of a species, its vulnerability to human impacts and environmental change, and the efficacy of conservation and management strategies. Investigating these patterns can also develop an understanding of the functioning of coastal shark nurseries. In this context, we undertook a multi-year fisheries-independent survey of shark occurrence along a 400-km stretch of tropical coastline. Logistic regression was used to identify spatial, seasonal and inter-annual variations in the occurrence of neonate and young-of-the-year (YOY) blacktip Carcharhinus limbatus/Carcharhinus tilstoni, pigeye Carcharhinus amboinensis, scalloped hammerhead Sphyrna lewini and spot-tail Carcharhinus sorrah sharks. Results indicated interspecific variations in occurrence. Seasonal variations characterised the occurrence of YOY pigeye, YOY spot-tail and neonate blacktip sharks, whereas spatial variations were more pronounced for YOY blacktip and scalloped hammerhead sharks. These results suggested that the occurrence of young sharks may be more complex than would be predicted by the timing of parturition alone. In addition, spatial heterogeneity in occurrence suggested that proximate bays are likely to vary in terms of the services they provide to young sharks.

Item ID: 40814
Item Type: Article (Research - C1)
ISSN: 1559-2731
Keywords: Elasmobranch, fisheries management, community structure, nursery
Related URLs:
Funders: Australian Government's National Environmental Research Program
Date Deposited: 23 Oct 2015 02:53
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
Downloads: Total: 2
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page