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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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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

    • 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)


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


Max. 5728

1 Oct.Month 3 Apr


WeatherPpm airport (Data NIWA)

Species breakdown


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)


  • 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


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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