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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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Presentation Transcript
slide1

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

slide2

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)

slide3

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

slide4

Max. 5728

1 Oct. Month 3 Apr

slide6

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)

slide7

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
slide8

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