while Ζ S S <cos(Δα)/PCV min and Ζ S S >cos(Δα)/PCV max,preying relationship absents,the former Eqs. shows two species in the same trophic level and the latter in more than one trophic level.
while Ζ S S <cos(Δα)/PCV min and Ζ S S >cos(Δα)/PCV max,preying relationship absents,the former Eqs. shows two species in the same trophic level and the latter in more than one trophic level.
当ΖS S cos (Δα) /PCVmax时 ,不存在捕食关系 ,前式为同一营养级 ,后式为相隔一个至几个营养级。