Insect eggs protected from high temperatures by limited homeothermy of plant leaves

Kristen Potter, Goggy Davidowitz, H. Arthur Woods

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Virtually all aspects of insect biology are affected by body temperature, and many taxa have evolved sophisticated temperaturecontrol mechanisms. All insects, however, begin life as eggs and lack the ability to thermoregulate. Eggs laid on leaves experience a thermal environment, and thus a body temperature, that is strongly influenced by the leaves themselves. Because plants can maintain leaf temperatures that differ from ambient, e.g. by evapotranspiration, plant hosts may protect eggs from extreme ambient temperatures. We examined the degree to which leaves buffer ambient thermal variation and whether that buffering benefits leaf-associated insect eggs. In particular, we: (1) measured temperature variation at oviposition sites in the field, (2) manipulated temperatures in the laboratory to determine the effect of different thermal conditions on embryo development time and survival, and (3) tested embryonic metabolic rates over increasing temperatures. Our results show that Datura wrightii leaves buffer Manduca sexta eggs from fatally high ambient temperatures in the southwestern USA. Moreover, small differences in temperature profiles among leaves can cause large variation in egg metabolic rate and development time. Specifically, large leaves were hotter than small leaves during the day, reaching temperatures that are stressfully high for eggs. This study provides the first mechanistic demonstration of how this type of leaf-constructed thermal refuge interacts with egg physiology.

Original languageEnglish (US)
Pages (from-to)3448-3454
Number of pages7
JournalJournal of Experimental Biology
Volume212
Issue number21
DOIs
StatePublished - Nov 1 2009

Fingerprint

insect eggs
Plant Leaves
Eggs
Insects
insect
egg
Temperature
leaves
temperature
Hot Temperature
heat
Body Temperature
body temperature
Ovum
Buffers
Datura
ambient temperature
Manduca
Datura wrightii
buffers

Keywords

  • Critical thermal maximum
  • Datura wrightii
  • Leaf size
  • Manduca sexta
  • Microclimate
  • Respirometry

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Physiology
  • Insect Science
  • Aquatic Science

Cite this

Insect eggs protected from high temperatures by limited homeothermy of plant leaves. / Potter, Kristen; Davidowitz, Goggy; Arthur Woods, H.

In: Journal of Experimental Biology, Vol. 212, No. 21, 01.11.2009, p. 3448-3454.

Research output: Contribution to journalArticle

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