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Ecology and Health Laboratory Department of Public Health University of Otago Wellington

Ecology and Health Laboratory Department of Public Health University of Otago Wellington. Kapiti Expressway hearing Mosquitoes around Waikanae … some field data & health concerns Dr M.McIntyre. Trapping: CDC (USA) surveillance std

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Ecology and Health Laboratory Department of Public Health University of Otago Wellington

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  1. Ecology and Health Laboratory Department of Public Health University of Otago Wellington Kapiti Expressway hearing Mosquitoes around Waikanae … some field data & health concerns Dr M.McIntyre

  2. Trapping: • CDC (USA) surveillance std • residential + peri-urban bush remnants + nearby paddocks • ~ 2-wk intervals Oct-Apr • Total sampling effort • 998 trap.nights • >18 000 mosquitoes Total mosquitoes Oct.-Apr location 02-03 03-04 _____________________ Karori 5247 Belmont 10 37 Waikanae76317 251 _____________________ (Snell A. PhD thesis 2006 UOW)

  3. Australian surveillance scale (Doggett et al 2001) Category no./trap.night Low <50 Moderate 50-100 High 101-1000 Very high >1000 Extreme 10 000     Waikanae(12 sites, 338 trap.nights) Oct April

  4. Max. 5728 1 Oct. Month 3 Apr

  5. WeatherPpm airport (Data NIWA) Species breakdown

  6. A bad disease record overseas! Introduced Aedes notoscriptus - “the striped mosquito” Culexquinquefasciatus - ‘Southern house’ mosquito (USA) Native Cxpervigilans – “vigilant mosquito” Aeantipodeus – bush mosquito, “the ‘singer” Coquellitidiairacunda – “the angry, mosquito” Cqtenuipalpus – rare, little known Maorigoeldiaagyropus – probably extinct in area (Snell, Derraik, McIntyre 2005) (Photo: Landcare Res) Vector ability of some native spptested in US lab for MAF Biosecurity (Kramer et al 2010)

  7. Concerns • standing water will extends breeding habitat • planted wetlands + vegetation corridors + open water surface creates humidity corridors which facilitate adult dispersal • exacerbation of seasonal biting nuisance • adjacent homeowners - especially where low-lying • irruption in favourable seasonal/weather conditions (flooding; ?drought) • avian malaria in native birds • future climate change & arbovirus threat • Measures • construction & planting of ponds • ecological function • pre-construction survey to establish baseline & best monitoring sites (seasonal timing important) • construction period contingencies • post-construction surveys • development of contingencies

  8. MfE predict +2.1- 2.2oC 1990-2090 • Warmer spring-autumn conditions will increase … • mosquito breeding • build up of virus – in mosquitoes (& wildlife – birds/possums) • range & seasonal expansion of anthropophilic mosquitoes • outdoor lifestyles / human exposures • flooding/ drought episodes … thank-you

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