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Ha) of Study Notes Area (%) Table 8: vegetation type AaEfTe Proportion Other Species / Code Vegetation Type Quadrats Landform Condition PF Area (ha) of study Notes area (%) Acacia aptaneura and A. pruinocarpa low open Eriachne mucronata, Mesa tops, woodland/tall sparse shrubland Eucalyptus leucophloia subsp. raised Excellent - WH12057, WH12154, AaEfTe over Eremophila forrestii subsp. leucophloia, Ptilotus valley/ Very None 79.54 0.16 WH13007 forrestii mid sparse shrubland calostachyus, Senna glutinosa lower Good over Triodia epactia low open subsp. glutinosa slope hummock grassland Vegetation type AaEfTe was identified during the 2012 survey, with mapping and composition refined in 2013. The quadrats in vegetation type AaEfTe formed a discrete floristic unit. Quadrats WH12057 and WH12154 occurred on mesas within the Rocklea land system; quadrat WH13007 was on a raised valley floor on the Robe land system, close to the border with the Rocklea land system. As the Rocklea land system is largely inaccessible, there may be more of this vegetation type than indicated. Quadrat photo: WH12057 © Ecoscape (Australia) Pty Ltd 8967-2984-13R_final_rev0 61 Table 9: Vegetation type AaTe Proportion Other Species / Code Vegetation Type Quadrats Landform Condition PF Area (ha) of study Notes area (%) Acacia tetragonophylla, Aristida contorta, Boerhavia coccinea, Cheilanthes sieberi subsp. sieberi, Enneapogon lindleyanus, Eremophila forrestii subsp. forrestii, Evolvulus alsinoides var. Acacia aptaneura low open villosicalyx, Iseilema Low hill, Indigofera sp. woodland over Triodia epactia dolichotrichum, Maireana WH12279, WH13011, valley, Good - Bungaroo Creek (S. AaTe and Enneapogon polyphyllus low planifolia, Paspalidium 134.53 0.27 WH13012 lower Excellent van Leeuwen 4301) sparse hummock grassland/low clementii, *Portulaca oleracea, slope (P3) isolated grasses Portulaca pilosa, Schizachyrium fragile, Senna artemisioides subsp. helmsii, Senna artemisioides subsp. oligophylla, Senna glutinosa subsp. glutinosa x luerssenii, Sida echinocarpa, Tragus australianus Vegetation type AaTe was identified during the 2012 survey, with mapping and composition refined in 2013. Vegetation type AaTe occurs on the Rocklea land system, in flat or gently undulating areas. The 2012 floristic analysis indicated quadrat WH12279 was floristically associated with drainage lines, however the 2013 analysis, with additional quadrats, indicates vegetation type AaTe to be more similar to a newly identified vegetation type, AiEfTw, that occurs nearby on slightly more elevated lands. As the Rocklea land system is largely inaccessible, there may be more of this vegetation type than indicated. Quadrat photo: WH12279 © Ecoscape (Australia) Pty Ltd 8967-2984-13R_final_rev0 62 Table 10: Vegetation type AaTw Proportion Other Species / Code Vegetation Type Quadrats Landform Condition PF Area (ha) of study Notes area (%) Acacia ancistrocarpa, A. pruinocarpa and A. aptaneura tall Acacia bivenosa, A. Valley Very AaTw open shrubland over Triodia citrinoviridis, Eucalyptus WH13005 (alluvial None 46.07 0.09 Good wiseana mid open hummock leucophloia subsp. leucophloia fan) grassland Vegetation type AaTw was identified as a discrete vegetation type in 2013 following floristic analysis. Floristically the quadrat that defines this vegetation type is grouped with others considered to represent a number of different types (e.g. both components of AiTwCh / AiTlAb), however the characteristic and dominant species have little in common thus quadrat WH13005 is considered to represent a different vegetation type. Quadrat photo: WH13005 © Ecoscape (Australia) Pty Ltd 8967-2984-13R_final_rev0 63 Table 11: Vegetation type AaTwEl Proportion Other Species / Code Vegetation Type Quadrats Landform Condition PF Area (ha) of study Notes area (%) Eremophila Acacia marramamba, Acacia magnifica subsp. pruinocarpa, Cymbopogon WH12002, WH12184, magnifica (P4), Acacia arida mid open shrubland ambiguus, Eriachne WH12185, WH12186, Mesa Indigofera sp. over Triodia wiseana and T. sp. mucronata, Eriachne pulchella WH12191, WH12192, crests, Bungaroo Creek (S. Robe River mid hummock subsp. dominii, Goodenia WH12196, WH12268, lower, van Leeuwen 4301) AaTwEl Excellent 1,863.65 3.69 grassland with Eucalyptus stobbsiana, Hakea WH12270, WH12273, mid and (P3), leucophloia subsp. leucophloia chordophylla, Jasminum WH12274, WH13025, upper Ptilotus mollis (P4), scattered trees didymum subsp. lineare, WH13027, WH13028, hillslopes Triodia sp. Robe Ptilotus calostachyus, Senna WH13029, WH13030 River (M.E. Trudgen glutinosa subsp. glutinosa et al. MET 12367) (P3) Vegetation type AaTwEl was known as AaTREl in 2012 (2012d). Additional quadrats have indicated the ground stratum is dominated by Triodia wiseana although Triodia sp. Robe River (M.E. Trudgen et al. MET 12367) (P3) remains as a characteristic species. Floristic analysis identified the quadrats forming vegetation type AaTwEl to be a discrete group (except quadrat WH12192 that was outside this grouping). Vegetation type AaTwEl is floristically most similar to vegetation type AcTwEl that is considered to be associated with the ‘Triodia sp. Robe River assemblages of mesas of the West Pilbara’ PEC. However vegetation type AaTwEl has only sparse or lacks the characteristic species Acacia citrinoviridis and A. pruinocarpa that are required to define the PEC. Quadrat photo: WH13029 © Ecoscape (Australia) Pty Ltd 8967-2984-13R_final_rev0 64 Table 12: Vegetation type AbTe Proportion Other Species / Code Vegetation Type Quadrats Landform Condition PF Area (ha) of study Notes area (%) Acacia aneura, A. aptaneura, Acacia bivenosa mid sparse A. marramamba, A. Very AbTe shrubland over Triodia epactia synchronicia, Ptilotus WH12029 Valley None 124.00 0.25 Good mid open hummock grassland helipteroides, Senna glutinosa subsp. glutinosa Vegetation type AbTe was identified as a discrete vegetation type in 2013; in 2012 quadrat WH12029 was included in vegetation type AbTw, however the ground stratum is not correct for this vegetation type. Floristically quadrat WH12029 was associated with other valley floor quadrats (including vegetation types AxEcTe and AeTw) however this quadrat had different dominant species to those nearby in the dendrogram. Therefore it was interpreted as being a discrete vegetation type. Quadrat photo: WH12029 © Ecoscape (Australia) Pty Ltd 8967-2984-13R_final_rev0 65 Table 13: Vegetation type AbTwCh Proportion Other Species / Code Vegetation Type Quadrats Landform Condition PF Area (ha) of study Notes area (%) Acacia bivenosa, A. synchronicia and A. ancistrocarpa mid-tall Acacia inaequilatera, Valleys, sparse shrubland over Triodia Corchorus lasiocarpus, WH12138, WH12142, undulating Triodia sp. Robe WH12187, WH12188, Very wiseana low open hummock Paraneurachne muelleri, valleys, River (M.E. Trudgen AbTwCh WH12199, WH12283, Good - 1,462.57 2.90 grassland with Corymbia Senna glutinosa subsp. lower et al. MET 12367) WH13001, WH13002, Excellent hamersleyana and Eucalyptus glutinosa, S. glutinosa subsp. WH13003 slopes, (P3) leucophloia subsp. leucophloia pruinosa footslopes mid scattered trees Vegetation type AbTwCh is a newly created vegetation type in 2013. It comprises quadrats that were mostly included in 2012 vegetation types AbTw and TwSg2 (2012d). The quadrats that ultimately comprise this vegetation type were not closely allied in the floristic dendrogram. A secondary analysis using quadrats that had unresolved alliances resulted in clear groupings that largely correlate with field interpretation of vegetation types. Mid stratum species varied and included Acacia arida, A. atkinsiana, A. exilis, Petalostylis labicheoides and Senna glutinosa (several infrataxa). Eremophila cuneifolia and several Triodia species (T. epactia, T. aff. melvillei and T. sp. Robe River) were also recorded from the ground stratum. Quadrat photo: WH12199 © Ecoscape (Australia) Pty Ltd 8967-2984-13R_final_rev0 66 Table 14: Vegetation type AcTwEl Proportion Other Species / Code Vegetation Type Quadrats Landform Condition PF Area (ha) of study Notes area (%) Acacia marramamba, A. bivenosa, A. maitlandii, Acacia citrinoviridis and A. Corchorus lasiocarpus, pruinocarpa tall open-sparse Cymbopogon ambiguus, shrubland over Triodia wiseana Duperreya commixta, Eriachne and T. sp. Robe River mid open mucronata, E. pulchella subsp. Triodia sp. Robe hummock grassland with dominii, Jasminum didymum WH12046, WH12269, Hillslopes River (M.E. AcTwEl Eucalyptus leucophloia subsp. Excellent 146.64 0.29 subsp. lineare, Petalostylis WH13008, WH13015 and crests Trudgen et al. MET leucophloia low scattered trees labicheoides, Ptilotus 12367) (P3) calostachyus, Ptilotus ‘Triodia sp. Robe River obovatus, Senna glutinosa assemblages of mesas of the subsp. glutinosa, Stylobasium West Pilbara’ PEC spathulatum, Tribulus suberosus Triodia sp. Robe River (M.E. Trudgen et al. MET 12367) (P3) is a characteristic species of this vegetation type. Three of the four quadrats forming vegetation type AcTwEl were closely spaced onto a discrete group within the floristic analysis dendrogram; the fourth quadrat (WH12046) was separated from the others but was interpreted to belong due to it having the same dominant species. Interpretation by the DEC in 2012 included quadrats WH12046 and WH12269 in the ‘Triodia sp. Robe River assemblages of mesas of the West Pilbara’ PEC. Ecoscape established additional quadrats in areas likely to be included in the PEC; these quadrats (WH13008 and WH13015) were determined by Ecoscape to represent the same vegetation type.
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