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Draft Habitat Conservation Plan for Game Management at Pu'u Wa'awa

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Draft Habitat Conservation Plan for Game Management at Pu'u Wa'awa DEPARTMENT OF LAND AND NATURAL RESOURCES, DIVISION OF FORESTRY AND WILDLIFE Draft Habitat Conservation Plan for Game Management at Pu‘u Wa‘awa‘a and Pu‘u Anahulu Nāpu‘u Conservation Project 10/20/2015 1 EXECUTIVE SUMMARY The Hawai‘i Department of Land and Natural Resources (DNLR), through the Division of Forestry and Wildlife (DOFAW), manages lands in the Pu‘u Wa‘awa‘a Forest Reserve (PWWFR) and the Pu‘u Anahulu Game Management Area (PAHGMA), in North Kona, on the Island of Hawai‘i. Nāpuʻu (The-hills) is the historical name used for the ahupua‘a of Puʻu Waʻawaʻa and Puʻu Anahulu (Maly and Maly 2006) and is the title we have chosen to represent the conservation project that incorporates the actions of this Habitat Conservation Plan (HCP). The area is home to native bird, plant and invertebrate species as well as non-native game mammal and bird species. Current land management in the Pu‘u Anahulu Game Management Area is primarily for maintenance of non-native game mammal populations for hunting, in addition to conservation of native habitat. Pu‘u Wa‘awa‘a Forest Reserve is a multi- use area where management includes game population maintenance for hunting, natural resource conservation and restoration, and other activities such as cattle grazing and trail use. This Habitat Conservation Plan is intended to consider and mitigate for the potential impacts from DOFAW game mammal management activities on endangered species within the Pu‘u Wa‘awa‘a and Pu‘u Anahulu areas (Plan Area 103,9881 acres). Potential negative impacts on Covered Plant species are primarily in the form of direct take from grazing, browsing, and trampling associated with the management of game mammals and cattle in the Plan Area. This plan as a whole intends to provide for avoidance and minimization measures, and mitigation which will provide net benefit to the species and environment, above and beyond any incidental take of protected species which may occur due to Plan actions. This plan will also utilize the grazing activities of game mammals and cattle to reduce fuel loads outside of planned and existing exclosures to prevent wildland fire which is a primary threat to dryland forests. Covered Species likely to be impacted by Plan activities were identified through consideration of previous botanical and wildlife surveys, as well as on-the-ground botanical and wildlife surveys performed as part of the HCP planning process. The development of this HCP will provide for the incidental take of one endangered insect, Blackburn’s sphinx moth (Manduca blackburni) and fifteen threatened and endangered plants:, Asplenium peruvianum var. insulare, Hala pepe (Chrysodracon hawaiiensis), Kauila (Colubrina oppositifolia), Honohono (Haplostachys haplostachya), Ma‘o hau hele (Hibiscus brackenridgei ssp. brackenridgei), Koki‘o (Kokia drynarioides), Neraudia ovata, ‘Aiea (Nothocestrum breviflorum), Uhiuhi (Mezoneuron kavaiense) Po‘e (Portulaca sclerocarpa), Hawaiian Catchfly (Silene lanceolata), Pōpolo kū mai (Solanum incompletum), Creeping Mint (Stenogyne angustifolia), A‘e (Zanthoxylum dipetalum var. tomentosum), and A‘e (Zanthoxylum hawaiiense). A model has been developed to estimate the density of individuals of each covered plant species within the Plan Area. These estimates are used to quantify the level of take anticipated for the covered plant species over the course of the HCP. All plant species located outside of fenced units are considered subject to take. Blackburn’s sphinx moth (Manduca blackburni) is the only insect species that has been identified as potentially impacted by activities within the Plan Area, from removal of non-native tree tobacco (Nicotiana glauca) from fuelbreaks to allow access for management and hunting activities. Clearing of fuelbreaks and roads is critical for overall fire suppression in the Plan 1 Plan Area acreage is based on TMK acreage. 2 Area. Data from larval surveys are used to estimate take of larvae in the Plan Area as well as guide avoidance, minimization, and mitigation actions. The focus for the stabilization of threatened and endangered species occurring within the Plan Area will be on restoration of functional communities. These communities should support not only stable Covered Species populations, but represent fully functional (insofar as possible), self- sustaining communities with minimal dependence on human management. Exclosures are the most effective tool for the avoidance and minimization of threats from ungulate grazing, browsing, and traffic on plant populations. Currently, 4,1812 acres (4 % of Plan Area) are fenced within eleven exclosures across the Plan Area, and additional 4,757 acres (4.5% of Plan Area) are proposed for fencing under this HCP. Take estimates are combined with species stabilization criteria to define mitigation goals for each plant species. Monitoring of compliance and take of protected species, review and implementation of adaptive management measures are required by law and to ensure that the HCP is implemented correctly, efficiently, and effectively for the species, environment, and all parties concerned. 2 Fenced unit acreage based on GIS acreage. 3 Table 0.1 Summary of Avoidance/Minimization and Mitigation Measures to Offset the Requested Take of Covered Species. Avoidance and Minimization within the Plan Area 1. Install all avoidance and minimization exclosures by Year 8 (See Section 4.3.6.2). a. Remove ungulates from within exclosures within first year of fencing (this may be dependent upon unit size). b. Invasive species control: i. Reduce overall alien cover by 50% around Covered Species by Year 8. ii. Conduct rodent and slug control or other threats as needed. iii. Maintain fuelbreaks around fencelines semi-annually. iv. Conduct quarterly fence line and ungulate ingress checks. c. Census of all Covered Species within a unit within first year of fencing. d. A monitoring plan for in situ populations will be developed by Year 3. Mitigation within the Plan Area 1. Install all mitigation exclosures by Year 15 (See Section 6.1). 2. Collection of propagules from in situ plant populations a. Identify propagule collection needs by Year 3. b. Collect propagules from each known plant population by Year 5 (see Section 6.5). 3. Collection of propagules from in situ plant populations a. Identify propagule collection needs by Year 3. b. Collect propagules from each known plant population by Year 5 (see Section 6.5). 4. Propagation of propagules for all Covered Species at Volcano Rare Plant Facility, DOFAW Waimea Tree Nursery, or PWW on-site nursery. 5. Outplanting of no less than the mitigation target for each Covered Species within appropriate exclosures in the Plan Area (see Section 6.1). a. Individuals (or clusters of individuals) will be tagged and documented with GPS. b. GPS location information, accession numbers, plant status, and any other pertinent information will be inputed into a database for long-term monitoring. c. Site preparation consists of removal of non-native vegetation, through weed whacking, herbicide, and/or manual pulling. d. A minimum of 50% of each Covered Species mitigation goal (Table 6.18) will be outplanted by Year 8. e. A minimum of 100% of each Covered Species mitigation goal (Table 6.18) will be outplanted by Year 15. f. A monitoring plan for mitigation populations will be developed by Year 3. g. Mitigation populations (individuals or clusters of individuals) will be monitored annually. 6. Management of outplanted populations for 25 years: a. Outplanted individuals are watered upon planting and follow up watering is provided as needed in the first 3 months. b. Pest control (aphids etc) will be conducted as needed. c. Removal of non-native species from outplanting areas: 4 i. Remove 90% of fountain grass and kikuyu grass from within 3 meters of an individual (or cluster of) outplants ii. Maintain a 25-50 m buffer of less than 50% invasive grass coverage around an individual (or cluster of) outplants. iii. Weeding is scheduled as needed. 5 Table of Contents EXECUTIVE SUMMARY ........................................................................................................................................... 2 1.0 INTRODUCTION AND PLAN OVERVIEW .............................................................................................. 15 1.1 REGULATORY SETTING .......................................................................................................................... 18 1.1.1 Endangered Species Act ................................................................................................................... 18 1.1.2 Chapter 195D, Hawai‘i Revised Statutes ...................................................................................... 18 1.1.3 Chapter 343, Hawai‘i Revised Statutes ......................................................................................... 20 1.1.4 National Historic Preservation Act ............................................................................................... 20 1.2 PLAN DESCRIPTION.................................................................................................................................. 21 1.2.1 Plan History .................................................................................................................................. 21 1.2.2 Purpose and Need for the Plan ...................................................................................................... 24 1.3 COVERED ACTIVITES: Game and Fire Management in the Plan Area ...................................................
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