Document Detail

Effect of temperature and relative humidity on the life cycle of Ornithodoros (Pavlovskyella) erraticus (Ixodoidea: Argasidae).
MedLine Citation:
PMID:  3437349     Owner:  NLM     Status:  MEDLINE    
The effect of different temperatures (18, 22, 28, and 32.5 C, at constant 75% RH) and relative humidities (0, 15, 42, 60, 75, 84, and 92%, at constant 28 C) on the duration of the life cycle of Ornithodoros (Pavlovskyella) erraticus is studied in the laboratory. The egg incubation period is longer at 22 C than at the other temperatures tested; the percentage of hatched eggs was markedly increased at 28 C in comparison with other temperatures (T's) and relative humidities (RH's) tested. At constant 28 C, most larvae (86.2%) are ready to feed within 7.2 days posthatching; they feed for 5-52 min and molt to N1 in 7.8 days postfeeding. Five nymphal instars are recorded. Unfed N1-N5 survived for a longer period at 18 C than at other temperatures, whereas the effect of RH's was insignificant. After feeding, nymphal premolting periods differ from one instar to another and from one T or RH to another. At 28 C, the males emerge from N3, N4, and N5 in 9-15 days postfeeding, while females emerge only from N4 and N5 in 10-16 days. The overall sex ratio (3 male:5 female) is not affected by different T's and RH's. The female and male life spans were longer (means 720 and 500 days, respectively) at 22 C than at other T's and RH's. This study shows that the duration of the life cycle of O. erraticus decreases with rising T and increases with an increase in RH. However, the 28 C and 75% RH seem to be the optimum conditions for this species.
S M el Shoura
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of parasitology     Volume:  73     ISSN:  0022-3395     ISO Abbreviation:  J. Parasitol.     Publication Date:  1987 Dec 
Date Detail:
Created Date:  1988-04-05     Completed Date:  1988-04-05     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  7803124     Medline TA:  J Parasitol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1102-8     Citation Subset:  IM    
Department of Biology, Sciences and Mathematics Center, Makkah, Saudi Arabia.
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MeSH Terms
Feeding Behavior
Sex Ratio
Ticks / growth & development*,  physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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