Moisture is required for the termination of egg diapause in the chrysomelid beetle, Homichloda barkeri

Nahrung, HF and Merritt, DJ (1999) Moisture is required for the termination of egg diapause in the chrysomelid beetle, Homichloda barkeri. Entomologia Experimentalis Et Applicata, 93 2: 201-207. doi:10.1046/j.1570-7458.1999.00579.x


Author Nahrung, HF
Merritt, DJ
Title Moisture is required for the termination of egg diapause in the chrysomelid beetle, Homichloda barkeri
Journal name Entomologia Experimentalis Et Applicata   Check publisher's open access policy
ISSN 0013-8703
Publication date 1999-01-01
Sub-type Article (original research)
DOI 10.1046/j.1570-7458.1999.00579.x
Volume 93
Issue 2
Start page 201
End page 207
Total pages 7
Language eng
Abstract Four factors (moisture, light regime, temperature, food type) were examined for their effects on the embryonic diapause of Homichloda (Weiseana) barkeri (Jacoby) (Coleoptera: Chrysomelidae), a biocontrol agent for prickly acacia, Acacia nilotica (L.) Willdenew ex Delile (Mimosaceae). Moisture is critical for termination of diapause. A single wetting of eggs resulted in a low hatch rate while a sequence of wetting events followed by periods of dryness produced a high hatch rate. A relatively constant proportion of embryos within each batch initiated development at each wetting event, with hatching complete after the eighth wetting event in these trials. An extended interval between wetting events, tested at up to 23 days, did not result in a decreased overall hatch rate. A threshold time of exposure to moisture of between 3 to 6 h is required before development proceeds. The response of eggs to the moisture regime is seen as a strategy for taking advantage of available food after rainfall by terminating diapause, rather than merely a quiescent response to the absence of moisture. Temperature affected development time and the proportion of eggs that developed. Experimental manipulations of photoperiod and host-plant availability showed no effect on embryonic development.
Keyword Entomology
Diapause Termination
Quiescence
Moisture
Embryonic Development
Prickly Acacia
Acacia-nilotica Mimosaceae
Jacoby Coleoptera
Temperature
Agent
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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Created: Mon, 13 Aug 2007, 21:28:26 EST