Publications

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ecology of invasive mosquitoes: effects on resident species and on human health.investigations of biological invasions focus on patterns and processes that are related to introduction, establishment, spread and impacts of introduced species. this review focuses on the ecological interactions operating during invasions by the most prominent group of insect vectors of disease, mosquitoes. first, we review characteristics of non-native mosquito species that have established viable populations, and those invasive species that have spread widely and had major impacts, testing wh ...200517637849
chikungunya virus: a novel and potentially serious threat to new zealand and the south pacific islands.there has never been a locally transmitted outbreak of mosquito-borne disease in new zealand, but the risk of an outbreak occurring is increasing with on-going interceptions of exotic mosquito vectors across its border, increasing traffic of goods and passengers, higher numbers of viremic travelers arriving, and local, regional, and global environmental change. the risk posed to new zealand by chikungunya virus is potentially high because of the transmissibility of this virus in subtropical clim ...201020889861
do ross river and dengue viruses pose a threat to new zealand?to determine the prevalence of antibodies to ross river and dengue viruses in sera from new zealand residents and travellers and to assess the potential of local mosquitoes to act as vectors of these viruses.19947970354
venereal transmission of sindbis virus between individuals of aedes australis (diptera: culicidae). 19846748004
vector competence of new zealand mosquitoes for selected arboviruses.new zealand (nz) historically has been free of arboviral activity with the exception of whataroa virus (togaviridae: alphavirus), which is established in bird populations and is transmitted by local mosquitoes. this naive situation is threatened by global warming, invasive mosquitoes, and tourism. to determine the threat of selected medically important arboviruses to nz, vector competence assays were conducted using field collected endemic and introduced mosquito species. four alphaviruses (toga ...201121734146
coelomomyces psorophorae var tasmaniensis couch + laird (1988) (coelomomycetaeceae: blastocladiales), a fungal pathogen of the mosquito aedes australis. i: structural changes in the outer walls of sporangia during germination.the germination of sporangia in coelomomyces psorophorae var tasmaniensis (c. p. tas.) is uncoordinated and thus there is a mixture of developmental stages in any given population. continuous urografin gradients separated out the critical stages of germinating sporangia giving four bands, each band representing a consecutive stage of germination. these stages were investigated for changes in the sporangial wall using transmission electron microscopy (tem). the sporangia have a typical two-layere ...19902233975
coelomomyces psorophorae var tasmaniensis couch + laird (1988) (coelomomycetaeceae: blastocladiales), a fungal pathogen of the mosquito aedes australis. ii: nuclear changes during meiospore formation.the presence of synaptonemal complexes were checked in dividing chromosomes as evidence for meiotic division in germinating sporangia. continuous urografin gradients were used to separate out the various phases of germinating sporangia, the nuclei were removed and embedded for ultrastructural studies. meiotic inhibitors were applied to germinating sporangia to retard meiotic division to highlight the synaptonemal complexes. at an early phase of sporangial differentiation dividing nuclei develope ...19902233977
entomopathogenic fungi for mosquito control: a review.fungal diseases in insects are common and widespread and can decimate their populations in spectacular epizootics. virtually all insect orders are susceptible to fungal diseases, including dipterans. fungal pathogens such as lagenidium, coelomomyces and culicinomyces are known to affect mosquito populations, and have been studied extensively. there are, however, many other fungi that infect and kill mosquitoes at the larval and/or adult stage. the discovery, in 1977, of the selective mosquito-pa ...200415861235
tolypocladium cylindrosporum (deuteromycotina: moniliales), a fungal pathogen of the mosquito aedes australis. ii. methods of spore propagation and storage.a laboratory fermenter was used to produce up to 12 l of infective tolypocladium cylindrosporum blastoconidia in sabouraud dextrose broth. two media derived from coconuts were also demonstrated as suitable alternative systems for the production of viable blastoconidia. t. cylindrosporum conidia when dried at 37 degrees c and stored at 4 degrees c retained their viability for 10 months, but, when stored at 25 degrees c, the conidia lost viability after 2 months and blastoconidia did not survive t ...19873574433
tolypocladium cylindrosporum (deuteromycotina: moniliales), a fungal pathogen of the mosquito aedes australis. i. influence of temperature, ph and salinity on the growth and sporulation of the fungus in the laboratory.the new zealand strain of tolypocladium cylindrosporum was cultured on sabouraud dextrose agar medium under varying regimes of growth conditions. the isolate exhibited good tolerances to temperature (4-35 degrees c), ph (3-10) and salinity (0-7% nacl). optimal vegetative growth and sporulation were recorded between a temperature range of 20-30 degrees c, ph of 5-6 and a salinity level of 0-2% nacl. the north american isolate of the fungus showed similar tolerances, while the european isolate was ...19863796716
tolypocladium cylindrosporum (deuteromycotina: moniliales), a fungal pathogen of the mosquito aedes australis. iii. field trials against two mosquito species.a blastoconidial preparation of the new zealand isolate of t. cylindrosporum was tested in two field trials against larvae of the freshwater mosquito aedes subalbirostris and the brackish water species ae. australis. there was some reduction in the population of the ae. subalbirostris larvae and larvae collected from the test pools exhibited signs of fungal infection when reared in the laboratory. in the brackish pools there was no observable decrease in the larval populations even though ae. au ...19873574434
competition between tadpoles and mosquito larvae.tadpoles and mosquito larvae often co-occur, and may compete for scarce resources. however, competition between such distantly related organisms has attracted less scientific attention than have interactions among closely related taxa. we examined ecological interactions in two tadpole-mosquito systems in southeastern australia, one from freshwater ponds (limnodynastes peronii and culex quinquefasciatus) and one from brackish-water habitats (crinia signifera and ochlerotatus australis). diets of ...200312684864
resource limitation, controphic ostracod density and larval mosquito development.aquatic environments can be restricted with the amount of available food resources especially with changes to both abiotic and biotic conditions. mosquito larvae, in particular, are sensitive to changes in food resources. resource limitation through inter-, and intra-specific competition among mosquitoes are known to affect both their development and survival. however, much less is understood about the effects of non-culicid controphic competitors (species that share the same trophic level). to ...201526558896
surveillance for arboviral zoonoses in new zealand birds.given the significant burden that emerging infectious diseases place on global economies and public health, the monitoring and mitigation of, and early response to, potential infectious diseases are of the highest priority. the objective of this study was to survey for known and other potential arboviral zoonoses in multiple bird species at four locations in new zealand.201324478919
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