Citation. Inouye, R. S.; Huntly, N. J.; Tilman, D. 1987. Response of Microtus pennsylvanicus to vegetation fertilized with various nutrients, with particular emphasis on sodium and nitrogen concentration in plant tissues. Holarctic Ecology 10:110-113.   [1078  LTER]

Summary. Fertilization of I x 4 m plots of old-field vegetation in Minnesota. USA, with various compounds resulted in increased plant tissue concentrations of N, P, K, Ca, Mg, Na, and Mn. Microtus pennsylvanicus showed significantly greater activity, estimated by scat counts, on plots fertilized with sodium sulphate. Data also suggested that increased Microtus activity in response to elevated plant tissue sodium concentration resulted in greater soil nitrogen availability and higher levels of nitrogen in plant tissues.