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Management options to minimise formation of urchin barrens: measuring...
A photographic and in situ diver survey of marked incipient Centrostephanus rodgersii barren patches, in eastern Tasmanian, was used to assess any changes in the grazed area and... -
Surveys of long spined sea urchin (Centrostephanus rodgersii) and barrens...
Quantitative surveys were undertaken at four sites in the Kent Group, north eastern Tasmania (southern and northern shores of East Cove at Deal Island, Winter Cove at Deal... -
Management options to minimise formation of urchin barrens: assessing...
Timed GPS-tracked swims using SCUBA (45 and 30 minutes), were used to assess the changes in frequency and size of Centrostephanus rodgerii incipient barrens in eastern Tasmania.... -
Management options to minimise formation of urchin barrens: kelp lines -...
Linear video transects (40m total length; 20m into barrens and 20m into kelp from original fixed marker on the benthos) were used to assess changes in kelp growth in several... -
Top-down sea urchin overgrazing overwhelms bottom-up nutrient stimulation of...
Biogenic marine habitats are increasingly threatened by a multitude of human impacts, and temperate coasts in particular are exposed to progressively more intense and frequent... -
Management options to minimise formation of urchin barrens: using belt...
Belt transect surveys (50m) were used to monitor the benthic community structure through time at experimental (lobster additions/ research reserve sites or abalone diver urchin... -
Dive surveys of long spined sea urchin (Centrostephanus rodgersii) and...
The spatial extent of the long spined sea urchin, Centrostephanus rodgersii, was estimated by divers using underwater visual census methods to survey rocky reef habitats at 13... -
Growth models, age frequency and size frequency distributions of sea urchin...
Growth models were constructed for two sea urchin populations over a two-year period using a tag-recapture study in the Mercury Passage, Tasmania. Sea urchins were tagged using... -
A pilot management program to maximise Tasmania's Sea Urchin (Heliocidaris...
The main aim of this research program was to determine the potential for reducing the density of urchins to encourage the return of seaweeds and an improvement in urchin roe... -
Inter-species differences in trophic position and diet of three sympatric...
Measurements of natural abundances of stable isotopes and direct observation of gut contents were used to determine the trophic positions of three sympatric sea urchin species.... -
Relative effects of sea urchins and fish on adult and recruiting macroalgae...
An experiment was conducted over 13 months to test whether sea urchins and herbivorous fishes exert additive effects on the macroalgal assemblage. Specific predictions were that... -
Effect of Centrostephanus rodgersii barrens on standing stocks of abalone...
The effect of barrens formed by the long spined sea urchin, Centrostephanus rodgersii, on the standing stocks of southern rock lobsters (Jasus edwardsii) and black lip abalone... -
PCR genetic screening for presence of sea urchin DNA in rock lobster faecal samples
Data is PCR amplification results of southern rock lobster (Jasus edwardsii) faecal material tested for sea urchin DNA (using unique primers for Centrostephanus rodgersii and... -
Drift-kelp suppresses foraging movement of overgrazing sea urchins
Sea urchins have the capacity to destructively overgraze kelp beds and cause a wholesale shift to an alternative and stable ‘urchin barren’ state. However, their destructive... -
Sea urchin predation mortality rates
Mortality rates of the sea urchin Heliocidaris erythrogramma where estimated under experimental conditions to determine the importance of natural and predation mortality in... -
Surveys of sea urchins (Centrostephanus rodgersii and Heliocidaris...
Quantitative surveys were undertaken at five sites in the Kent Group, north eastern Tasmania (Murray Pass, Winter Cove, Little Squally Cove,and southern end of Erith Island) by... -
Effect of Heliocidaris erythrogramma on benthic macroalgae and drift retention
Two experiments were performed. The first was designed to test for effects of Heliocidaris at different densities, using fenced plots in which the densities of Heliocidaris were... -
A pilot management program to maximise Tasmania's Sea Urchin (Heliocidaris...
The main aim of this research program was to determine the potential for reducing the density of urchins to encourage the return of seaweeds and an improvement in urchin roe... -
Natural growth lines in sea urchin (Heliocidaris erythrogramma) ossicles
Sea urchin tagged using tetracycline display visible marks in jaw elements and test plates that can be used to determine growth and subsequently an individuals age. Natural... -
Abundance estimates of sea urchins and a suite of predators over multiple...
Underwater visual census surveys were conducted at 15 sites in eastern Tasmania to quantify the abundance of the sea urchin Heliocidaris erythrogramma and several putative...
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