reference : Survival of immature Ixodes scapularis (Acari: Ixodidae) at different relative humidities

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Bibliographic fields
reftype Journal Article
Abstract Survival of unfed larvae and nymphs of Ixodes scapularis Say (formerly named I. dammini Spielman, Clifford, Piesman & Corwin) was tested at 27-degrees-C for relative humidities ranging from 65 to 100%, which were maintained by various saturated salts or water. The times until half the larvae died (LT50) at 100, 93,85, 75, and 65% RH were 67.1, 26.6, 8.3, 1.3, and 1.1 d, respectively. Maximal larval survival in the laboratory was 129, 59, 24, 3, and 2 d at the same relative humidities. There was a distinct difference between the mortality cur-ves for larvae at 93% RH and 100% RH, which suggests that larvae were taking in water from the air at the higher RH whereas those at an RH less-than-or-equal-to 93% were not. There was little difference between the 100 and 93% RH survival curves for the nymphs. All of the nymphs at 100% RH survived at least 149 d. At 93 and 100% RH, one nymph survived at each RH for 210 and 205 d, respectively. The LT50s for the nymphs of I. scapularis were 169.9 (100% RH), 168.5 (93%), 118.8 (85%), 10.7 (75%), and 3.6 (65%) d. Maximal nymphal survival in the laboratory was 162, 65, and 8 d at 85, 75, and 65% RH, respectively. The inability of the larvae to retain water effectively is probably more important than the ability to imbibe water from subsaturated air in the survival of this stage. Subadult I. scapularis require a relatively humid habitat for survival, although some individuals have the potential to seek a host for many weeks within a mesic environment.
Author Stafford III, K. C.
DOI 10.1093/jmedent/31.2.310
Date Mar
ISSN 1938-2928
Issue 2
Journal Journal of Medical Entomology
Keywords ixodes-scapularis; ticks; relative humidity; dammini acari; lyme-disease; new-york; ecology; island; ticks
Language English
Notes Mz394 Times Cited:55 Cited References Count:25
Pages 310-314
Title Survival of immature Ixodes scapularis (Acari: Ixodidae) at different relative humidities
Volume 31
Year 1994
Bibliographic identifiers
.reference_type 0
_record_number 17754
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