|SREL Reprint #0186|
of Radiation on Survival of Wild Cotton Rats (Sigmodor Rispidus)
in Enclosed Areas of Natural Habitat
R. Pelton and Ernest E. Provost
Each month for 4 successive months 4 groups of wild
adult female cotton rats (8 females per group) were irradiated at dose levels of
500, 750, 900, 1050, and 1200 R whole-body.
Treatment was accomplished at 1.5 m using a 9200 Cl137 Cs
source at a rate of approximately 20 R per minute. Each group was released into a one acre enclosure with 4
unirradiated (control) females and 4 untreated males. Fifteen days later the animals were removed by live and/or
snap trapping. Recapture and
survival data on the females were subjected to analysis of variance for the
effects of dose level and month, and a field LD50 was determined.
Results of these filed experiments substantiate the high re-dioresistance
determined for this species in previous laboratory experiments and aggressive
quantitative similarity and qualitative differences in stressors existing
between the environments. A direct
correlation was established between dose level and survival with recaptures
ranging from 91% at the 500 R level to 25% at 1200R.
Survival was essentially 100% among controls.
No seasonal effects were noted in these experiments.
SREL Reprint #0186
Pelton, M.R. and E.E. Provost. 1969. Effects of radiation
on survival of wild cotton rats (Sigmodon hispidus) in enclosed
areas of natural habitat. p. 39 45. In Second National
Symposium on Radioecology, edited by D.J. Nelson and F.C.
Evans. CONF 670503. Ann Arbor, MI.