Effects of warm winter temperature on the abundance and gonotrophic activity of culex (Diptera: Culicidae) in California

William Reisen, Tara Thiemann, Chris Barker, Helen Lu, Brian Carroll, Ying Fang, Hugh D. Lothrop

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Culex tarsalis Coquillett, Cx. quinquefasciatus Say, and Cx. pipiens L. were collected during the warm winter of 2009 using dry ice-baited and gravid traps and walk-in red boxes positioned in desert, urban, and agricultural habitats in Riverside, Los Angeles, Kern, and Yolo Counties. Temperatures exceeded the preceding 50 yr averages in all locations for most of January, whereas rainfall was absent or below average. Abundance of Culex species in traps during January ranged from 83 to 671% of the prior 5 yr average in all locations. Few females collected resting were in diapause during January based on follicular measurements. Evidence for early season gonotrophic activity included the detection of freshly bloodied, gravid, and parous females in resting collections, gravid oviposition site-seeking females in gravid female traps, and nulliparous and parous host-seeking females at dry ice-baited traps. Female Culex seemed to employ multiple overwintering strategies in California, including larval and adult quiescence, adult female diapause, and an intermediate situation with adult females collected with enlarged follicles, but without evident vitellogenesis. West Nile, St. Louis, or western equine encephalitis viruses were not detected in 198 pools of adults or 56 pools of adults reared from field-collected immatures collected during January and February 2009. Our preliminary data may provide insight into how climate change may extend the mosquito season in California.

Original languageEnglish (US)
Pages (from-to)230-237
Number of pages8
JournalJournal of Medical Entomology
Volume47
Issue number2
DOIs
StatePublished - Feb 1 2010

Fingerprint

Culex
Culicidae
Diptera
Temperature
winter
traps
temperature
Dry Ice
diapause
Western equine encephalitis virus
Western Equine Encephalitis Viruses
Culex tarsalis
host seeking
Vitellogenesis
oviposition sites
gravid females
vitellogenesis
Oviposition
Los Angeles
Climate Change

Keywords

  • California
  • Culex
  • Diapause
  • Overwintering

ASJC Scopus subject areas

  • Parasitology
  • veterinary(all)
  • Insect Science
  • Infectious Diseases

Cite this

Effects of warm winter temperature on the abundance and gonotrophic activity of culex (Diptera : Culicidae) in California. / Reisen, William; Thiemann, Tara; Barker, Chris; Lu, Helen; Carroll, Brian; Fang, Ying; Lothrop, Hugh D.

In: Journal of Medical Entomology, Vol. 47, No. 2, 01.02.2010, p. 230-237.

Research output: Contribution to journalArticle

Reisen, William ; Thiemann, Tara ; Barker, Chris ; Lu, Helen ; Carroll, Brian ; Fang, Ying ; Lothrop, Hugh D. / Effects of warm winter temperature on the abundance and gonotrophic activity of culex (Diptera : Culicidae) in California. In: Journal of Medical Entomology. 2010 ; Vol. 47, No. 2. pp. 230-237.
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