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The relationship between the size of spring adult cohort of Dermacentor variabilis Say (Acari, Ixodidae) and its parental breeding season under relaxed winter regulation
Author(s) -
McEnroe W. D.
Publication year - 1987
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.1987.tb00556.x
Subject(s) - biology , ixodidae , acari , population , zoology , tick , seasonal breeder , dermacentor variabilis , ecology , demography , sociology
In a study of the tick, Dermacentor variabilis , at Hatchville on Cape Cod, Massachusetts, between 1978 and 1985 (M c E nroe 1986) there were 5 survival winters, i.e. limited frozen bare ground, followed by large spring adult cohorts (M c E nroe and S pecht 1984). The size of the breeding seasons was measured in tick days (TD) i.e. the average sample size captured over their summer activity period times the number of days of activity. The level of activity was regulated by water stress (M c E nroe and S pecht 1987) as well as the population size (N). The generation time from the summer breeding to the spring adult cohort was 1–3/4 years. The size of the spring adult cohorts, plus those in 1974, 1986 and 1987 (unpubl.), versus tick days is shown in the figure. The population size neared its carrying capacity (K) of ca 8000 adults.