THE ECOLOGY OF TICKS TRANSMITTING ROCKY MOUNTAIN SPOTTED FEVER IN THE EASTERN UNITED STATES.
Abstract
Field and laboratory studies pertaining to the ecology of Dermacentor variabilis (primarily) in relation to transmission of Rocky Mountain spotted fever are reported. Isolation of Rickettsia rickettsii was made from 18 of 36 tick pools collected at a 40 acre study area. A vegetative survey of the study area was done to determine the extent of correlations between the distribu tion of infectious foci, tick distribution, and other related phenomena. Correlative analyses are in progress. The total adult Dermacentor variabilis population was measured with a mark and recapture technique; distribution, migration, and other aspects of the ecology of this species are also reported. Laboratory studies on behavior were initiated with temperature controlled systems to provide humidity gradients. Unfed nymphs exhibited a strong tendency to remain in humid areas. Oviposition, hatching, and longevity at different relative humidities were measured. Oviposition was largely independent of humidity, but hatching was greatly reduced at humidities below 65%; survival was also greatly curtailed at lower humidities. Studies on the dynamics of feeding in D. variabilis are also reported. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 24, 1964
- Accession Number
- AD0430951
Entities
People
- Daniel E. Sonenshine