01975nas a2200205   4500008004100000245010800041210006900149260003200218300001100250520124000261653002201501100001601523700001801539700001801557700001601575700001701591700001601608700001701624856012801641       1992                        eng d00aPopulation ecology of thirteen-lined ground squirrels in ungrazed tallgrass prairie manipulated by fire0 aPopulation ecology of thirteenlined ground squirrels in ungrazed  aUniversity of Northern Iowa  a51 -543 a<p>From March 1983 to October 1987, thirteen-lined ground squirrels (Spermophilus tridecemlineatus Mitchill) were studied in ungrazed tallgrass prairie manipulated by fire on the Konza Prairie Research Natural Area, Kansas. Overall abundance varied among years (2.6 animals/ha in 1985; 5.6 animals/ha in 1986); however, no significant variation in sex ratio was observed (overall average=52% males for adults, 48% males for juveniles). Fire had a positive effect on ground squirrels; abundance was significantly higher in burned than unburned prairie during the year of a fire and in more recently than less recently burned prairie during years following a fire. Ground squirrels also selected hillsides with exposed rocks (breaks) over upland and lowland prairie sites. Although females and males selected similar habitats, home ranges were significantly larger for adult males (average=0.56 ha) than for adult females (0.36 ha). Both adult females and males caught on the study area typically were residents rather than transients. Further, overwinter survival did not differ between adult females and males. Overwinter survival of juvenile females was similar to adults; however, no juvenile males overwintered on the study area</p>10atallgrass prairie1 aClark, B.K.1 aKaufman, D.W.1 aKaufman, G.A.1 aGurtz, S.K.1 aBixler, S.H.1 aSmith, D.A.1 aJacobs, C.A.  uhttp://lter.konza.ksu.edu/content/population-ecology-thirteen-lined-ground-squirrels-ungrazed-tallgrass-prairie-manipulated