The absence of an interaction between a Microtus pennsylvanicus density cycle and Dermacentor variabilis infestation levels.
D000818:Animals; D003411:Arvicolinae / Q000469:parasitology* / Q000502:physiology; D002980:Climate; D003870:Dermacentor / Q000502:physiology*; D006790:Host-Parasite Interactions; D008404:Massachusetts; D012376:Rodent Diseases / Q000453:epidemiology; D012621:Seasons; D013984:Tick Infestations / Q000453:epidemiology / Q000662:veterinary*; D013987:Ticks / Q000502:physiology*