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Lovegrove, T. G., C. H. Zeiler, B. S. Greene, B. W. Green, R. Gaastra, and A. D. Macarthur., 2002. Alien Plant

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Lovegrove, T. G., C. H. Zeiler, B. S. Greene, B. W. Green, R. Gaastra, and A. D. Macarthur., 2002. Alien Plant Alien plant and animal control and aspects of ecological restoration in a small mainland island: Wenderholm Regional Park, New Zealand. T. G. Lovegrove1, C. H. Zeiler2, B. S. Greene1, B. W. Green1, R. Gaastra1, and A. D. MacArthur1 1Auckland Regional Council, Private Bag 92 012, Auckland, New Zealand. 2 19 McKenzie Avenue, Arkles Bay, Whangaparaoa, New Zealand. E-mail address of corresponding author: [email protected] Abstract Since 1965, ecosystem-focused ecological restoration has been undertaken in a small (60 ha) mainland island at Wenderholm Regional Park (134 ha), which lies on a peninsula on the east coast north of Auckland. A 60 ha coastal forest has been fenced to exclude livestock and retired pastureland has been reforested. Brushtail possums (Trichosurus vulpecula) and rats (Rattus rattus and R. norvegicus) have been reduced to very low densities and feral cats (Felis catus) and mustelids (Mustela spp.) have been controlled. Forest health and New Zealand pigeon (Hemiphaga novaeseelandiae) breeding success have improved and large invertebrates are now more abundant. By early 1999, Wenderholm was deemed suitable for experimental releases of birds, which had become locally extinct on the northern North Island mainland. In the first release, 21 North Island robins (Petroica australis) were translocated from nearby Tiritiri Matangi Island in March 1999. During the past two years, survival of site-attached robins has been high and they have fledged 46 young, thus the robins have been useful indicators of successful control of some invasive alien mam- mals. However, despite high productivity, recruitment has been insufficient to compensate for adult losses. Poor recruit- ment may be due to high rates of juvenile dispersal from the mainland island because of its small size. Linkages with nearby forest areas allow robins to disperse easily, and the ultimate success of the translocation is therefore uncertain. The dispersal distances of species intended for release need to be taken into account in the planning of any new main- land island. Keywords Revegetation; New Zealand robin; translocation. INTRODUCTION europaeus), feral cats (Felis catus), stoats (Mustela Most unmanaged forest reserves on the New Zealand main- erminea), ferrets (M. furo), weasels (M. nivalis) and red land harbour many of the invasive alien mammals intro- deer (Cervus elaphus). Invasive alien plants, which threaten duced by Europeans (King 1990), as well as an increasing the native forest, include climbing asparagus (Asparagus number of invasive alien plants (Esler 1987). These intro- scandens), kahili ginger (Hedychium gardnerianum), duced species threaten much of New Zealand’s remaining cotoneaster (Cotoneaster glaucophyllus), tree privet biodiversity (King 1984; Esler 1988; Wright and Cameron (Ligustrum lucidum), woolly nightshade (Solanum 1990; Saunders and Norton 2001). Conservation manag- mauritianum), periwinkle (Vinca major) and kikuyu grass ers in New Zealand have achieved considerable success (Pennisetum clandestinum). in removing a range of exotic mammals from offshore is- lands (Veitch and Bell 1990). During the past decade, the When Wenderholm became a park in 1965, a 60 ha coastal experience gained in removal of invasive species from is- forest remnant on a headland was fenced to exclude live- lands has been applied successfully at some mainland sites stock (Auckland Regional Council 1995). Intensive pest (Saunders 1990, Innes et al. 1995, 1999, Saunders and control, especially of possums, did not begin until 1982, Norton 2001). Mainland sites provide opportunities to re- and since 1990, invasive alien plants have been control- store communities which do not occur on islands, or to led. restore very large areas (Saunders and Norton 2001). A study of New Zealand pigeons (Hemiphaga Intensive control of alien plants and mammals has been novaeseelandiae) which began in 1988 (Clout et al. 1995a) undertaken at Wenderholm Regional Park (hereafter re- showed low breeding success as a result of nest predation, ferred to as Wenderholm, Fig. 1) since 1992, thus it is one probably mainly by ship rats. As a result, annual rat poi- of New Zealand’s longer running so-called ‘mainland is- soning began in 1992. Rat and possum control was fol- lands’ (see Saunders 1990, Saunders and Norton 2001). lowed by significantly higher pigeon breeding success Invasive alien mammals which have occurred at (Clout et al. 1995b, James and Clout 1995), improved for- Wenderholm include brushtail possums (Trichosurus est health (Dijkgraaf 1997), and an increase in the abun- vulpecula), ship (Rattus rattus) and Norway (R. dance and diversity of some invertebrates (Craddock 1997). norvegicus) rats, house mice (Mus musculus), rabbits Wenderholm was seen as an ideal site for animal pest con- (Oryctolagus cuniculus), hedgehogs (Erinaceus trol, because being a peninsula, and partly separated from Pages 155-163 In Veitch, C. R. and Clout, M. N. (eds.). Turning the tide: the eradication of invasive species. IUCN SSC Invasive Species Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK. Turning the tide: the eradication of invasive species surrounding land by a state highway, reinvasion by some Christensen 2000), Trounson Kauri Park (450 ha) (Miller mammalian pests is slower. 1997), Kakepuku (135 ha) (Hoverd 2000) and Paengaroa (100 ha) (D. P. Armstrong pers. comm.)), may provide an Since 1995, some pastureland has been planted with early indicative test of how big a mainland island needs to be to successional species such as manuka (Leptospermum support a viable robin population. The key difference be- scoparium), kanuka (Kunzea ericoides), karamu tween these sites, and large unmanaged forests with natu- (Coprosma macrocarpa), flax (Phormium tenax), and cab- ral robin populations on the mainland, is that the release bage trees (Cordyline australis). The objectives of this sites all have intensive control of invasive alien mammals. planting are to enlarge the existing forest patch, to provide The assumption, even though small numbers of some al- linkages with surrounding forest remnants, to restore some ien predatory mammals will be present, is that the small former wetlands, and to suppress invasive alien plants. mainland islands approximate offshore islands, which are free of these predators. Thus, like some small offshore is- As a result of improved forest health and successful ro- lands, small mainland islands should be able to support dent and possum control, Wenderholm was chosen for an viable robin populations. experimental release of North Island robins (Petroica In this paper, we describe the control of invasive alien australis longipes)(Lovegrove 1998). Robins had been animals and plants at Wenderholm, reforestation, and the locally extinct for at least a century (Oliver 1955; Heather release of North Island robins as part of an ecosystem- and Robertson 1997). Robins were considered suitable be- focussed ecological restoration programme. cause (see also Armstrong 2000): (1) They have persisted on the mainland despite introduced mammalian predators, STUDY AREA AND METHODS (2) although they may coexist with introduced predators, robins are useful indicators of the numbers of some preda- tors (e.g. rats) (Brown 1997; Etheridge and Powlesland Study area 2001), (3) they have broad niche requirements, surviving Wenderholm Regional Park (134 ha, 36O33’S, 174O43’E) in shrub lands, forest, and exotic forests, (4) they are rela- lies on a peninsula on the east coast about 45 km north of tively sedentary, thus more likely to remain close to the Auckland (Fig. 1). The park is bounded by two tidal estu- release site (Flack 1978, Lovegrove 1996), (5) they can aries and consists of a hilly (up to 140 m) forested head- be trained to take food, which facilitates capture, captive land comprising about 80 ha, a partly-forested spit of con- maintenance and post-release monitoring (Armstrong 1995), and (6) they are conspicuous and relatively una- fraid of humans and thus ideal for conservation advocacy. The major objective of the robin release is to establish a viable population, which might be harvested for future translocations. The key question is: can a small mainland island like Wenderholm support a viable population? Rob- ins do occur in smaller habitat areas on islands free of most or all introduced predators: for example, black rob- ins (P. traversi) persisted for many years in a 5 ha forest remnant on Little Mangere Island (16 ha) (Butler and Merton 1992); they occurred on Herekopare Island (29 ha) before being exterminated by cats (Fitzgerald and Veitch 1985); robins were successfully introduced to Motuara (40 ha) and Allports (16 ha) Islands (Flack 1978); and the population of 60 on Tiritiri Matangi Island occu- pies only 13.4 ha of mature forest habitat (Armstrong et al. 2000, Armstrong and Ewen in press a). These self-sustaining populations on small islands con- trast with the mainland, where populations seem now to be confined to large areas (>1000 ha) of forest (extrapo- lated from Bull et al. 1985). This distribution mimics that of the tomtit (Petroica macrocephala) in Northland (Ogle 1982), where tomtits now occur only in large forest rem- nants. These distributions presumably mainly result from the impacts on populations of habitat fragmentation and high levels of predation by introduced mammals (Flack and Lloyd 1978, Moors 1983, Atkinson 1985, Brown Fig. 1 Wenderholm Regional Park, showing 1997). Thus the robin release at Wenderholm, and recent areas of
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