Reproductive synchrony of three sympatric species of wobbegong shark (genus Orectolobus) in New South Wales, Australia: reproductive parameter estimates necessary for population modelling

2007 ◽  
Vol 58 (8) ◽  
pp. 765 ◽  
Author(s):  
Charlie Huveneers ◽  
Terence I. Walker ◽  
Nicholas M. Otway ◽  
Robert G. Harcourt
Keyword(s):  
New South ◽  
New South Wales ◽  
Species Conservation ◽  
Sympatric Species ◽  
Parameter Estimates ◽  
Reproductive Parameters ◽  
Population Modelling ◽  
Male Population ◽  
Total Length ◽  
South Wales

Reproductive parameters of three closely-related sympatric species of wobbegong (Orectolobus ornatus, O. maculatus and O. halei) off New South Wales (NSW) were investigated to contribute to a biological basis for the management of a commercial fishery targeting wobbegongs. Estimates of the onset of maturity based on ovary condition were 729 mm, 1117 mm, and 1591 mm total length (TL) for O. ornatus, O. maculatus and O. halei respectively. The length at which 50% of the male population is mature based on clasper calcification was 803 mm, 1282 mm and 1784 mm TL for O. ornatus, O. maculatus and O. halei, respectively, and was similar to female onset of maturity based on uterus condition and to TL-at-maternity. These species of wobbegong had synchronous, triennial reproductive cycles. Follicles took 2 years to enlarge before ovulation. During the first year, follicles remained small, and then grew rapidly during the second year before ovulation during November. Gestation lasted ~10–11 months and parturition occurred during September–October. Mean litter sizes were nine (s.e. 0.5) and 21 (s.e. 1.5) for O. ornatus and O. maculatus, respectively, and increased with female total length in O. ornatus. Pregnant O. ornatus and O. maculatus were frequently caught in northern NSW and no pregnant wobbegongs, or females with large, yolky follicles were captured south of Sydney. Differences in the reproductive conditions of wobbegongs caught in northern and central NSW suggested geographically dependent reproductive behaviour. Knowledge of the reproductive parameters provided in this paper is necessary for adequate fisheries management and species conservation assessments.

scholarly journals The 10 Lords of the Universe respond to Lim

1997 ◽  
Vol 3 (4) ◽  
pp. 319 ◽  
Author(s):  
Paul Adam ◽  
Tony Auld ◽  
Doug Benson ◽  
Peter Catling ◽  
Chris Dickman ◽  
...  
Keyword(s):  
Threatened Species ◽  
New South ◽  
New South Wales ◽  
Species Conservation ◽  
Scientific Committee ◽  
South Wales ◽  
The Universe

Lim (1997) has recently presented a critique of aspects of the New South Wales Threatened Species Conservation Act (TSCA), and in particular of the role of the Scientific Committee established by the Act.

The genetic diversity and distinctiveness of the Yellow-footed Rock-wallaby Petrogale xanthopus (Gray, 1854) in New South Wales

1998 ◽  
Vol 4 (2) ◽  
pp. 164 ◽  
Author(s):  
Lisa C. Pope ◽  
Andy Sharp ◽  
Craig Moritz
Keyword(s):  
Genetic Diversity ◽  
Threatened Species ◽  
New South ◽  
New South Wales ◽  
Species Conservation ◽  
Habitat Disturbance ◽  
European Settlement ◽  
South Wales ◽  
Feral Animals ◽  
Species Being

Yellow-footed Rock-wallabies (YFRW) Petrogale xanthopus have declined in numbers since European settlement from past hunting for skins, habitat disturbance and predation and competition with feral animals (Gordon et al. 1978, 1993; Copley 1983; Henzell 1990). This has led to the species being classed as potentially vulnerable to extinction in Australia (Kennedy 1992), and endangered in New South Wales (Schedule 1, Threatened Species Conservation Act, 1995).

Habitat Use by Sminthopsis-Crassicaudata, Planigale-Gilesi and Planigale-Tenuirostris (Marsupialia, Dasyuridae) in Semiarid New-South-Wales

1987 ◽  
Vol 14 (4) ◽  
pp. 385 ◽  
Author(s):  
DG Read
Keyword(s):  
Regression Analysis ◽  
Habitat Use ◽  
Arid Zone ◽  
New South ◽  
New South Wales ◽  
Sympatric Species ◽  
Sminthopsis Crassicaudata ◽  
South Wales ◽  
Soil Cracks ◽  
Habitat Variables

Habitat use by Sminthopsis crassicaudata, Planigale gilesi and P. tenuirostris was investigated in the arid zone of New South Wales. All species showed considerable flexibility in habitat use at all times, and abundance was poorly predicted from easily measured parameters of the habitat. However, evidence was found for separation of microhabitat among these sympatric species. Multiple regression analysis indicated that abundance of S. crassicaudata was negatively associated with height of vegetation and the depth and density of soil cracks, and that of P. gilesi was positively associated with these habitat variables. Plant height was positively associated with abundance of P. tenuirostris and it was the only important predictor for this species. These results are discussed in conjunction with trapping records from other habitats.

A Symposium on the Dingo. Edited by Chris Dickman and Daniel Lunney. A Review by Peter Thomson.

2001 ◽  
Vol 23 (2) ◽  
pp. 189
Author(s):  
P Thomson
Keyword(s):  
Threatened Species ◽  
Canis Lupus ◽  
New South ◽  
New South Wales ◽  
Species Conservation ◽  
Vulnerable Species ◽  
South Wales ◽  
Legislative Changes ◽  
Management And Conservation

A symposium on the dingo (Canis lupus dingo) was held in Sydney in May 1999 to discuss issues surrounding the conflicting views of the dingo: seen both as a potentially threatened species, and as a species that needs to be controlled because of its predation on livestock. The Symposium was particularly relevant to New South Wales (NSW) because of consideration being given to place the dingo on the schedule of NSW vulnerable species, under the NSW Threatened Species Conservation Act 1995. The potential for conflict was exacerbated by concurrent legislative changes in NSW (Rural Lands Protection Act 1998) requiring the Crown to control pest animals declared under the Act. Despite the obvious focus on the NSW situation, many of the issues discussed have wider relevance to the management and conservation of dingoes across Australia.

Weeds and biodiversity conservation: A review of managing weeds under the New South Wales Threatened Species Conservation Act 1995

2009 ◽  
Vol 10 ◽  
pp. S53-S58 ◽  
Author(s):  
Paul O. Downey ◽  
Moira C. Williams ◽  
Leonie K. Whiffen ◽  
Peter J. Turner ◽  
Alana L. Burley ◽  
...  
Keyword(s):  
Biodiversity Conservation ◽  
Threatened Species ◽  
New South ◽  
New South Wales ◽  
Species Conservation ◽  
South Wales

Movements and Home Ranges of Three Sympatric Dasyruids, Sminthopsis crassicaudata, Planigale gilesi and P. tenuirostris (Marsupialaia), in Semiarid Western New South Wales

1984 ◽  
Vol 11 (2) ◽  
pp. 223 ◽  
Author(s):  
DG Read
Keyword(s):  
New South ◽  
New South Wales ◽  
Sympatric Species ◽  
Trapping Site ◽  
Niche Separation ◽  
Home Ranges ◽  
Sminthopsis Crassicaudata ◽  
South Wales ◽  
Local Abundance

A mark and recapture study was conducted over 2 years in a trapping site ofapproximately 50 ha. Ofthe 692 individuals captured, 30% were recaptured; in all trapping periods, a high proportion of animals caught had not been captured previously. The three species showed considerable mobility throughout the year, but during June Planigale spp. were more sedentary. Mobility is implicated in the changes in local abundance of these insectivores. Some individuals had movements in excess of 400 m day-l; average rates of displacement were 620 m in 100 days for Sminthopsis crassicaudata and 400 m in 100 days for Planigale gilesi. Home ranges ofall species were described as unstable and continually shifting. It is suggested that mobility is an important factor in niche separation between these sympatric species.

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