Saalfeld, W. Keith

4 publications

Marsh, Helene D.; Saalfeld, W. Keith (detail)
1989Distribution and abundance of dugongs in the northern Great Barrier Reef Marine Park.
Austral. Wildl. Res. 16(4): 429-440. 5 tabs. 5 figs.
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Marsh, Helene D.; Saalfeld, W. Keith (detail)
1990The distribution and abundance of dugongs in the Great Barrier Reef Marine Park south of Cape Bedford.
Austral. Wildl. Res. 17(5): 511-524. 4 tabs. 8 figs.
—Aerial surveys in 1986-87 gave a population estimate of 3,479 ± S.E. 459 dugongs in the region. Highest densities were observed on inshore seagrass beds and in waters less than 5 m deep. Maps of dugong density and distribution are given, and recommendations are made on the timing of future surveys.
Marsh, Helene D.; Saalfeld, W. Keith (detail)
1991The status of the dugong in Torres Strait. In: D. Lawrence & T. Canfield-Smith (eds.), Sustainable development for traditional inhabitants of the Torres Strait region.
Great Barrier Reef Marine Park Authority Workshop Ser. No. 16: 187-194. 2 tabs. 1 fig.
—Aerial survey data from 1987-88, and earlier catch statistics, indicate a minimum population estimate of 12,522 ± S.E. 1,487 dugongs in the region but are deemed insufficient to determine either the current catch level or the maximum sustainable harvest.
Marsh, Helene D.; Prince, Robert I. T.; Saalfeld, W. Keith; Shepherd, R. (detail)
1994The distribution and abundance of the dugong in Shark Bay, Western Australia.
Wildl. Res. 21(2): 149-161. 4 tabs. 4 figs.
—Aerial surveys in winter 1989 gave a minimum population estimate of 10,146ñ1,665 (s.e.) dugongs at an overall density of 0.71ñ0.12 (s.e.) dugongs/kmý, the highest density ever recorded on a large-scale survey. The high proportion of calves (19%) suggested an exceptionally high calving rate in 1988. Dugong density was highest in relatively deep water (12-16 m). Surveys in summer 1990 and 1991 confirmed that dugong distribution in Shark Bay varies seasonally with water temperature.