Above Board - Summer 2013/14

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Getting up to speed

A diving ambition

Donation of a fast rescue craft from Teekay Shipping will allow AMC to incorporate jet-powered training for students.

Masa Tatsumi has a plan to illustrate the damage caused by trashing our rivers and what can be done about it.

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#5

SUMMER 2013-14

amc.edu.au

A BI-ANNUAL PUBLICATION OF THE AUSTRALIAN MARITIME COLLEGE

MAPPING MARINE

INVADERS A new technique being developed by researchers will help monitor the spread of sea urchins

Small but devastating: A diver sizes up a juvenile sea urchin. Mapping their barrens will help control their spread.

T

he extent of sea urchin barrens along the east coast of Tasmania could soon become clearer through a new mapping technique being developed by researchers at the University of Tasmania. Dr Alex Forrest, from the Australian Maritime College, and Dr Vanessa Lucieer, from the Institute for Marine and Antarctic Studies, are collaborating on a research project that combines their expertise in autonomous underwater vehicle (AUV) technologies and acoustic mapping to create an accurate picture of where these barrens are. The long-spine sea urchin, Centrostephanus rodgersii, is an

PICTURE: EMMA FLUKES

‘URCHINS EAT EVERYTHING ON THE REEF AND HAVE THE CAPACITY TO DENUDE IT OF VIRTUALLY ALL LIVING FORMS’ invasive species which has hitched a ride in the warmer waters of the eastern Australian current and extended its range along Tasmania’s east and south coast. There is currently no detailed baseline map of the barrens habitat it creates by overgrazing kelp and other seaweeds. “You can’t get a handle on where the species is likely to create barrens into the future without having a map of where it is now,” Dr Lucieer said. “These urchins eat everything on the reef and have the capacity to denude it of virtually all living

Bluefin team: Mike Bell (DSTO), Dr Vanessa Lucieer (IMAS), Dr Alex Forrest (AMC) and Rowan Frost (AMC) during a research trip off the east coast of Tasmania.

forms. The barrens represent a new and stable ecological state devoid of macroalgae and many of the fish usually associated with rocky reefs, significantly impacting important fisheries like abalone and rock lobster. “So we want to create a baseline map, and from that baseline we can start correlating other variables about the sea floor and the water column, the oceanographic processes, tides and currents, and we can start to build an ecological model of how this invasive species is living in the system and where it might move.” Dr Lucieer and Dr Forrest recently returned from a pilot research trip on board AMC’s training vessel MV Continued on page 2

ABOVE BOARD ❘ ISSUE 5 ❘ SUMMER 2013/14

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