. Ectoparasites of the cottontail rabbit in Lee County, northern Illinois. Parasites. 100 - 0 -50. PER CENT AVERAGE NUMBER â 7 7â ~r T >^ C" O T 1-40^ h- o o o UJ 1-302 tr UJ - 20 a: UJ CD log < Fig. 10.âMonthly distribution (per cent of rabbits infested and average number on infested rabbits) of Cediopsylla sim- plex in Lee County, 1952-1954. The graph is based on 3-month sliding scale of data in table 3. It is interesting to compare the apparent seasonal fluctuations in populations of this flea with populations of other species. Evans & Freeman (1950), in a survey of small mam
. Ectoparasites of the cottontail rabbit in Lee County, northern Illinois. Parasites. 100 - 0 -50. PER CENT AVERAGE NUMBER â 7 7â ~r T >^ C" O T 1-40^ h- o o o UJ 1-302 tr UJ - 20 a: UJ CD log < Fig. 10.âMonthly distribution (per cent of rabbits infested and average number on infested rabbits) of Cediopsylla sim- plex in Lee County, 1952-1954. The graph is based on 3-month sliding scale of data in table 3. It is interesting to compare the apparent seasonal fluctuations in populations of this flea with populations of other species. Evans & Freeman (1950), in a survey of small mammals occurring near Oxford, England, found that: "For each species of host, the monthly indices point clearly to a rise, not only in the number of fleas per host, hut also in the numbers of hosts in- fested, during the spring, with a maximum reached in the summer and a subsequent decline to a winter low. Such seasonal variation has been observed repeateilly, yet it is by no means clear how much this is due to a real decline in the numbers of fleas present in the breed- ing environment (the nests and burrows of the hosts), how much to a decrease in flea activity, or how much to changes in the numbers or activity of the host popu- ; Recently, lloldenried et al. (1951) reported marked seasonal fluctuations in two species of fleas in California which have the same mammalian host. They found that the peak of abundance for one flea was in summer and the peak for the other was in winter. Whatever may be the reason for the apparent abrupt increase in numbers of the common eastern rabbit flea on rabbits in Lee County in spring, the time of increase coincides, perhaps significantly, with the main breeding season of rabbits. Presumably, more occupied rabbit nests are present in spring than at any other time of year, a condition which is favorable for the development of a maximum number of larval fleas. 13. Please note that these images are extracted from scanned page i
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