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Complexities of coastal shark movements and their implications for management

Speed, Conrad W., Field, Iain C., Meekan, Mark G. and Bradshaw, Corey J.A. (2010). Complexities of coastal shark movements and their implications for management. Marine Ecology Progress Series,408:275-293.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 57 times in Scopus Article | Citations
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Title Complexities of coastal shark movements and their implications for management
Author Speed, Conrad W.
Field, Iain C.
Meekan, Mark G.
Bradshaw, Corey J.A.
Journal Name Marine Ecology Progress Series
Publication Date 2010-06-03
Volume Number 408
ISSN 0171-8630   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-77954102456
Start Page 275
End Page 293
Total Pages 19
HERDC Category C1 - Journal Article (DIISR)
Abstract Global declines of shark populations are of concern because of their largely assumed role as moderators of ecosystem function. Without long-term data on movement patterns for many species, it is impossible to infer relative extinction risk, which varies as a function of range, dispersal and habitat specificity and use. The past 50 yr of research on coastal sharks has revealed common movement patterns among species. In the horizontal plane, measured home range size generally increases with body size. We demonstrate meta-analytically the effects of increasing body size and monitoring time on home range size. Changes in the extent of horizontal movement might arise from ontogeny, predator avoidance or environmental tolerances. In the vertical plane, movement patterns include oscillatory vertical displacement, surface swimming, diel vertical migration and swimming at depth. These vertical movements are often attributed to foraging or navigation, but have been quantified less than horizontal patterns. Habitat specificity is often correlated with environmental conditions such as depth, salinity, substratum, and in some cases, prey availability. Site fidelity is common in species that use nursery areas. However, fidelity to mating, pupping, feeding and natal sites has only been observed in a few species. To date, few studies have examined habitat partitioning, although some general patterns have emerged: habitats appear to be subdivided by benthos type, prey availability and depth. The conservation of coastal sharks can be facilitated in some cases by the use of marine protected areas, especially for coastal resident species using specific nursery, reproduction or feeding areas. Partial protected-area closures might be effective during aggregation or migration periods to protect older size classes, but these must be applied with other management strategies such as reduced fishing and size or bag limits to protect individuals throughout different life history phases. More long-term research on habitat use, migration patterns and habitat partitioning is essential for developing successful management initiatives for coastal shark populations.
Keywords Depth range
Extinction risk
Habitat loss
Habitat partitioning
Home range
Horizontal range
Life history
Site fidelity
Vertical migration
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Additional Notes Copyright by Inter-Research Speed CW, Field IC, Meekan MG, Bradshaw CJA (2010) Complexities of coastal shark movements and their implications for management. Mar Ecol Prog Ser 408:275-293
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Created: Fri, 29 Aug 2014, 17:34:45 CST by Anthony Hornby