TY - RPRT TI - Variation in predation pressure as a mechanism underlying differences in numerical abundance between populations of the poeciliid fish Heterandria formosa AU - J.M.L. Richardson AU - M. S. Gunzburger AU - J. Travis PY - 2005 DO - 10.1007/s00442-005-0306-y UR - https://pubs.usgs.gov/publication/70030506 ID - 70030506 ER -