Thermal biology, population fluctuations and implications of temperature extremes for the management of two globally significant insect pests

Casper Nyamukondiwa, Christopher W. Weldon, Steven L. Chown, Peter C. le Roux, John S. Terblanche

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The link between environmental temperature, physiological processes and population fluctuations is a significant aspect of insect pest management. Here, we explore how thermal biology affects the population abundance of two globally significant pest fruit fly species, Ceratitis capitata (medfly) and C. rosa (Natal fruit fly), including irradiated individuals and those expressing a temperature sensitive lethal ( tsl) mutation that are used in the sterile insect technique. Results show that upper and lower lethal temperatures are seldom encountered at the field sites, while critical minimum temperatures for activity and lower developmental thresholds are crossed more frequently. Estimates of abundance revealed that C. capitata are active year-round, but abundance declines markedly during winter. Temporal autocorrelation of average fortnightly trap captures and of development time, estimated from an integrated model to calculate available degree days, show similar seasonal lags suggesting that population increases in early spring occur after sufficient degree-days have accumulated. By contrast, population collapses coincide tightly with increasing frequency of low temperature events that fall below critical minimum temperatures for activity. Individuals of C. capitata expressing the tsl mutation show greater critical thermal maxima and greater longevity under field conditions than reference individuals. Taken together, this evidence suggests that low temperatures limit populations in the Western Cape, South Africa and likely do so elsewhere. Increasing temperature extremes and warming climates generally may extend the season over which these species are active, and could increase abundance. The sterile insect technique may prove profitable as climates change given that laboratory-reared tsl flies have an advantage under warmer conditions.

Original languageEnglish
Pages (from-to)1199-1211
Number of pages13
JournalJournal of Insect Physiology
Volume59
Issue number12
DOIs
Publication statusPublished - Dec 1 2013

Fingerprint

insect pests
Insects
Hot Temperature
heat
Biological Sciences
Ceratitis capitata
Temperature
Population
lethal genes
temperature
Ceratitis rosa
Diptera
sterile insect technique
heat sums
Fruit
mutation
Physiological Phenomena
insect control
Pest Control
Mutation

All Science Journal Classification (ASJC) codes

  • Physiology
  • Insect Science

Cite this

Nyamukondiwa, Casper ; Weldon, Christopher W. ; Chown, Steven L. ; le Roux, Peter C. ; Terblanche, John S. / Thermal biology, population fluctuations and implications of temperature extremes for the management of two globally significant insect pests. In: Journal of Insect Physiology. 2013 ; Vol. 59, No. 12. pp. 1199-1211.
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Thermal biology, population fluctuations and implications of temperature extremes for the management of two globally significant insect pests. / Nyamukondiwa, Casper; Weldon, Christopher W.; Chown, Steven L.; le Roux, Peter C.; Terblanche, John S.

In: Journal of Insect Physiology, Vol. 59, No. 12, 01.12.2013, p. 1199-1211.

Research output: Contribution to journalArticle

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