The Argentine ant is native to South America and has spread widely across the globe. In this study, we use genetic analyses and behavioural assays to examine the colony structure of Argentine ants in New Zealand. Diet modification studies were also carried out in order to help identify what factors influence these behavioural assays. There was no aggression observed between any pairings tested across the North Island of New Zealand, though we found that diet manipulations in the laboratory could lead to low levels of aggression between previously amiable Argentine ant nests. The New Zealand population of Argentine ants was characterized by low levels of genetic variation in six microsatellite loci from their nuclear genome. Additionally, the population also lacked significant genetic structuring with no patterns of regional differentiation or isolation by distance. An analysis of molecular variation (AMOVA) found that the majority of genetic variation was present at a nest level (93% of total genetic variance), with little genetic differentiation observed within or between regions (3 -4% of total genetic variance). No correlation between aggression and genetic relatedness was observed. This evidence suggests that Argentine ants in New Zealand effectively form a unicolonial population, which is likely the result of colonization from a single source population. As far as we know, this is the first country to have an entirely unicolonial population of Argentine ants.
The threat imposed by invasive species and difficulties associated with control and management places more impetus on trying to prevent their introduction. The identification of introduction pathways is a vital component towards this goal. In this study, we use a genetic marker‐based approach to retrospectively investigate the pathway of origin of the invasive Argentine ant (Linepithema humile) into New Zealand. We intensively sample the mitochondrial gene cytochrome b, from the entire known range of Argentine ants in New Zealand. No genetic variation was found in New Zealand. In order to identify likely introduction pathways, we use two alternative genetic analyses and suggest that a tcs approach that collapses identical haplotypes and calculates the probability of parsimony is superior to standard phylogenetic tree‐building algorithms. A minimum spanning network allowed relationships to be examined among sequences collated from previous international studies. The cytochrome b sequence, when compared to a global database, matched that from an Australian population. That Australia is the potential source of Argentine ants is in agreement with the New Zealand interception record, as goods from Australia have the highest number of interception records of Argentine ants. Our approach can easily be duplicated for other organisms and the methodology can be more widely applied to help aid further efforts to identify the routes of transmission for other invasive species and allow us to efficiently direct our biosecurity monitoring effort.
Auheke: Kei roto tonu i te mātauranga taiao te oranga o nga mea katoa o te ao, ahakoa he kararehe, ahakoa he rākau, ahakoa he aha. Mo tēnei mahi rangahau i kōrero mātou ki ngā kaumātua e waru, no Te Atiawa me Ngāti Kuia, mo ngā tītī o tā rātou rohe o Te Tau Ihu o te Waka o Māui. Ko te nuinga o ngā kōrero he titiro ki te maha o te tītī ki taua takiwā, mehemea kei te mau pai tonu ngā kōhanga o te tītī, ki a rātou ake mahi hopu tītī, ā, ki a rātou tikanga mo te tiaki i te tītī. Te āhua nei kua iti haere te nuinga o te tītī, na te mea kua ngaro haere ngā tikanga tiaki tītī o ngā rā o mua. Ki ētahi, na ngā rāhui o te Kāwanatanga te hē, na te mea kua kore e āro ake ki te mātauranga o te Māori. Tuarua, kua iti haere te nuinga o te tītī mai te ao whānui, ina rā, kua tata mate katoa, e ai ki ētahi kōrero pēnei i te IUCN. Ko te mea kē, ka ngaro te rangatiratanga o te mātauranga taiao ka iti haere hoki te nuinga o te tītī. Nā kona e kī ai tēnei mahi rangahau, me kaha tonu te titiro ki nga mahi hopu tītī a te Māori. Me mau pono tonu ki ngā tikanga o te mātauranga taiao kia kore ai e iti haere te nuinga o ngā mea katoa o te taiao -koiana te kōrero.Abstract: Traditional ecological knowledge (TEK) can provide valuable insights into historical abundance, ecology and conservation of species. In this study, we interviewed eight Maori kaumatua of Te Atiawa and Ngāti Kuia to document Maori traditional knowledge, or matauranga Maori, of sooty shearwaters (Puffinus griseus) of the Marlborough Sounds, New Zealand. Interview questions focused on shearwater abundance, breeding habitat, customary harvest, and traditional management. Matauranga Maori suggests high shearwater abundance historically, as well as traditional harvest protocols and traditional population management techniques no longer in use. Government imposed harvest bans reduced interaction with, and thus matauranga Maori of, sooty shearwaters followed by the species experiencing a worldwide decline in abundance and being classified as Near Threatened by the IUCN. Our study serves as an important reminder that TEK and species abundance often decline in tandem and that cultural harvest must be considered when designing conservation management strategies for species.
Abstract. The Sooty Shearwater (Ardenna grisea) is one of the better studied petrels of New Zealand. Although one of New Zealand's most abundant seabirds, smaller populations of Sooty Shearwaters may be less resilient to stochastic events in the long term. We investigated aspects of the breeding biology of Sooty Shearwaters and burrow dynamics on Long Island, in the Marlborough Sounds, New Zealand, from November 2008 to May 2009. Burrows were usually simple and unbranched, with an average length of 83.6 cm (s.e. 4.3 cm). The incubation period was 54.3 days (s.e. 1 day) and the nestling period 104.5 days (s.e. 2 days). Breeding success was 40.1%, within the range expected based on published studies of other populations of Sooty Shearwaters and of congeners. This study paves the way for further investigation into the viability and persistence of a small island population.
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