Abstract
Selenium levels in liver and kidney tissues were determined for rock squirrels ( Spermophilus variegatus) trapped within a distinct elevational gradient (grassland to pinyon-juniper ecosystem; alkaline to acidic soil) within the confines of the Kirtland Air Force Base Military Reservation in central New Mexico. Selenium levels in tissues were determined by graphite furnace atomic absorption spectrophotometry. Selenium kidney/liver ratios determined for rock squirrels decreased as elevational gradient increased ( r = −0.9403) in the pinyon-juniper ecosystem and increased as elevational gradient increased in the grassland ecosystem ( r = 0.9493). Other tests of significance ( t test, α 0.05) also support the inverse relationship between selenium kidney/liver ratios in grassland and pinyon-juniper ecosystems.
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