De Lange P.J.,Ecosystems and Species Unit |
Rolfe J.R.,Wellington Hawkes Bay Conservancy |
Townsend A.J.,Northland Conservancy
New Zealand Journal of Botany | Year: 2011
Crassula natans var. minus (Crassulaceae) is recorded for the first time from New Zealand, in the northern North Island at Lake Waiporohita, Karikari Peninsula. Native to southern Africa, this Crassula was previously known from Australasia only as a naturalized plant of Australia. Its discovery in the shoreline turf communities at Lake Waiporohita in mid November 2010 is regarded as a recent, natural dispersal event from Australia. Although Crassula natans var. minus has almost certainly naturally dispersed to New Zealand from Australia, it is regarded as naturalized to New Zealand rather than indigenous. A description of Crassula natans var. minus based on New Zealand specimens is provided. © 2011 The Royal Society of New Zealand.
Robertson H.A.,Research and Development Group |
Colbourne R.M.,Research and Development Group |
Graham P.J.,Northland Conservancy |
Miller P.J.,Northland Conservancy |
And 2 more authors.
Bird Conservation International | Year: 2011
The population growth of Brown Kiwi Apteryx mantelli was measured under four different management regimes: unmanaged, predator trapping, predator poisoning, and Bank of New Zealand Operation Nest Egg™ (BNZONE) - the removal of eggs for artificial incubation and return of resultant subadults to the wild. Life table analysis revealed that high adult mortality (7.3% per annum), caused mainly by domestic dog Canis familiaris and Ferret Mustela furo predation was the critical factor affecting Brown Kiwi populations in central Northland. The 13.8-year life expectancy of adults was only one-third of what can be expected in the absence of these two predators. Predation of Brown Kiwi chicks and juveniles (< 1 kg) by Stoats Mustela erminea and, to a lesser extent, domestic cats Felis catus, was also important. Unmanaged populations declined at 2.5% per annum. Trapping pests in a 200 ha area was largely ineffective, with the population declining by 1.7% per annum. Poisoning pests allowed Brown Kiwi populations to increase at 3.3% per annum. BNZONE proved to be by far the most effective tool, resulting in a 12.5% annual population increase, mainly due to 83% chick survival to six months old, compared with 10% survival in unmanaged sites. There were no observable behavioural problems associated with chicks being reared ex situ, but BNZONE was the most expensive tool and benefited only the Brown Kiwi. This study has helped to develop a range of tools that are now being used to facilitate recovery of populations of all four threatened species of kiwi in New Zealand, and the experimental approach used has wider application in management of other threatened species. © Copyright BirdLife International 2010.
Barbraud C.,University of La Rochelle |
Booth A.,Northland Conservancy |
Taylor G.A.,National Office |
Waugh S.M.,Museum of New Zealand Te Papa Tongarewa
Marine Ornithology | Year: 2014
The Flesh-footed Shearwater Puffinus carneipes is a widespread sub-tropical species, breeding on Southern Hemisphere islands managed by New Zealand, Australia and France. Recent concern over the population’s stability and frequently noted bycatch in longline fisheries has prompted a review of its conservation status. Studies of nesting shearwaters at two sites presented here provide detail of survivorship rates for two populations, studied over 13 and 23 years, respectively, in northern New Zealand sites. Adult survival (0.93–0.94) is moderate to high compared with survival of congeners. Population growth rates estimated from marked individuals indicate stability for one site and decline at the other site. Average age of first return of banded chicks was 6.2 years of age in one study and 6.4 years in the other. Current threats affecting survivorship for the New Zealand populations of this species are reviewed. © 2014, Marine Ornithology. All Rights Reserved.
Ball O.J.-P.,NorthTec |
Whaley P.T.,Kaitaia Area Office |
Booth A.M.,Northland Conservancy |
Hartley S.,Victoria University of Wellington
New Zealand Journal of Ecology | Year: 2013
Te Paki Ecological District in Northland is regarded as a New Zealand biodiversity hotspot, but habitat loss and forest fragmentation have adversely affected many of its endemic species. We investigated the distribution and habitat associations of Mecodema tenaki (Coleoptera: Carabidae), a Te Paki endemic ground beetle whose threat status was recently changed from 'Nationally Critical' to 'Declining'. Manual searching and pitfall trapping (live-capture and lethal) were used to detect the species at 46 sites in three habitat types: native forest, pine plantation and shrubland. Between 2006 and 2010, 41 individuals were found at five locations in the east of the district, significantly increasing individual and locality records for the species. Efficacy of both forms of pitfall trapping for determining presence/absence of M. tenaki was extremely high, whereas manual searching had lower sensitivity. Beetles were only found in structurally heterogeneous native forest with a closed canopy, including edge zones. All beetles were found at sites underlain by rocks of the Parengarenga Group (mainly Kaurahoupo Conglomerate); however, neither forest community composition nor soil properties were good predictors of beetle presence. The most important factor influencing the present distribution of M. tenakiis likely to have been anthropogenic habitat disturbance. Our study shows that lethal trapping methods are not essential for studying or monitoring this threatened species. It also shows that retaining and managing even very small native forest fragments within its historical range may be important for the protection of the species, and that a site-based rather than a single-species approach is likely to be the most effective management strategy. The possibility of relocating beetles to suitable, presently unoccupied locations should not be discounted. Our results indicate that a threat ranking of 'Nationally Vulnerable' rather than 'Declining' may be more appropriate for the species. © New Zealand Ecological Society.