EMROP: Waihi North Project WAI-985-000-PLN-LC-0001_Rev0 clean Table 8. Explanation table for BOAM for: Western fragment Broadleaved scrub. Refer BOAM, Table 5 Biodiversity attribute Benchmark and justification Impact value Action and confidence Biodiversity value by 20 years Justification for confidence (References / data) Attribute Net Biodiversity Value Indigenous Canopy height (m) 15 m Height of typical VS5 canopy species more or less (generally pioneer trees and shrubs, e.g. kānuka- 18m, mahoe- 15m, mapou- 6m; kowhai- 20m). At maximum height, VS5 could be expected to be transitioning to a mature forest type. 15 m Measured onsite: mixture of pole tree fern, rewarewa and pōhutukawa Enhancement of SNA166: 20 ha Confidence >50- <75% 15 m By 20 years from pine removal, rewarewa / towai expected to spread canopies and existing understorey growth (e.g. mahoe, pideonwood, currently >5 m) fill light gaps within 20 years. Note risks- pine dominance is variable, with some areas having very limited indigenous composition 1.42 Indigenous Canopy cover (%) 85% The benchmark of at least 85% canopy cover considers best case scenario whereby colonising weeds will be shaded out between plantings. 70% Measured onsite: Canopy patchy / discontinuous Enhancement of SNA166: 20 ha Confidence 7590% 80% Canopy reclosure expected by 20 years following pine tree removal Note risks- pine dominance is variable, with some areas having very limited indigenous composition. Canopy may remain open in some areas longer, though infill planting still expected to close gaps. 1.91 Indigenous canopy species richness (count) 15 Up to 15 native canopy species could be expected in VS5 scrub / forest, based on reviews (e.g. Singers et al. 2017). 3 Recorded onsite: mixture of pole tree fern, rewarewa and pōhutukawa Enhancement of SNA166: 20 ha Confidence >50- <75% 3 Expected with maintenance of planted species. Note risks- pine dominance is variable, with some areas having very limited indigenous composition. Canopy diversity may be limited where rewarewa & towai remain dominant canopy spp. Balanced by shorter canopies elsewhere with greater diversity reflecting current subcanopy and enrichment species. 1.0 Indigenous understorey species richness (count) 25 Ref Jennifer Shanks, expert opinion for VS5 vegetation type 12 Recorded onsite (Bioresearches 2022): Enhancement of SNA166: 20 ha Confidence >90% 20 Expected with maintenance of enrichment planting. Planting schedule includes 10 additional enrichment species to be planted after 5 years. Some colonisation through bird and wind dispersal also expected (e.g. Sullivan et al. 2005). 1.84 Diversity of native avifauna (count) 15 spp Five additional species could be expected for a VS5 scrub / forest benchmark in the Waihi area, given consideration of species that may have potential to colonise from the Coromandel and Kaimai Ranges (e.g. tomtit, whitehead, kereru, falcon & bellbird) 10 spp Maximum total native species diversity recorded from site visits to SNA166 and 5 MBCs Enhancement of SNA166: 27 ha Confidence 7590% 12 species (increase 2 spp) Bellbird and kereru have been recorded in the surrounding landscape but not from SNA 166. These species will be expected within 20 years. Bellbird and kereru have been recorded in the surrounding landscape but not from SNA 166. Additional food plants have been provided for in the SNA enrichment planting schedule. It is anticipated that these bird species be become regular visitors by 20 years, resident thereafter. 0.84
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