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Parks Victoria Technical Series No. 79 Flinders and Twofold Shelf Bioregions Marine Natural Values Study Table 14. Physical attributes of the Point Hicks Marine National Park. Park Name Point Hicks Conservation status Marine National Park Biophysical Region Twofold Shelf Size 3810 ha (ranked 5 th of 24) Length of coastline ~ 9.6 km Shoreline geology Granite and sand Area with depth: 0 - 10 m 307 ha Comprising 10 m) subtidal substrate and biota was surveyed and mapped acoustically (Figure 19 & Figure 20) by Holmes et al. (2007a). Underwater video transects allowed the substrate and biota to be predictively modelled for the areas not surveyed. 47
Parks Victoria Technical Series No. 79 Flinders and Twofold Shelf Bioregions Marine Natural Values Study The coast of Point Hicks MNP is mostly bare sandy sediment with a band of high profile reef extending from a narrow intertidal rock platform around the base of Point Hicks itself (Figure 17 and 18). The majority of the intertidal habitat is sandy beach fronting an extensive dune system in the west of the MNP (Ball and Blake 2007). The subtidal reef is mostly continuous close to shore, becoming more patchy moving offshore (Ball and Blake 2007). It consists of granite slopes, boulders, rock gullies and outcrops (Williams et al. 2007). Some areas of boulders and cobble are interspersed with sand (Williams et al. 2007). The main biotic habitat is tall crayweed Phyllospora comosa and common kelp Ecklonia radiate (Williams et al. 2007). Underneath this canopy there is a highly diverse cover of fleshy red thallose algae (Williams et al. 2007). Giant kelp Macrocystis pyrifera can also occur adding to the vertical habitat structure (Williams et al. 2007). The majority of the subtidal sediment (Figure 19) is flat medium sand or coarse gravel made up of shells or shell fragments (Holmes et al. 2007a). Sediment as mapped by Holmes et al. (2007a) covered 33 sq. km and reef outcrops in nearshore shallower water < 55 m, covered 1 sq. km. Nearly half of the mapped sediment had no identifiable biota living on it. The rest has sparse macroalgae Caulerpa and sessile invertebrates (e.g. Figure 22) predominately sponges (Holmes et al. 2007a). Sessile invertebrates are common from approximately 30 m depth (Figure 20), and sparse Caulerpa is modelled as present over an extensive band at moderate water depths (Holmes et al. 2007a). Figure 18. Aerial view of the coast of Point Hicks Marine National Park (QASCO 20/01/04). Photography ortho-rectified by PIRVic. Figure from Ball and Blake (2007). 48
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Page 51 and 52: Figure 15. Location of habitat type
Page 61: Figure 17. Location map of Point Hi
Page 85 and 86: Figure 30. Location map of Cape How
Page 89 and 90: Figure 33. Biota mapping of Cape Ho
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4 Appendix 1 Compilation of species
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Biotic group Family Species Common
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Parks Victoria is responsible for m
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