  It is shown that all simple ecological, i.e. population dynamical equations
(unlimited exponential population growth (or decrease) dynamics, logistic or
Verhulst equation, usual and generalized Lotka-Volterra equations) hold a
symmetry, called $C_{E}PT$ symmetry. Namely, all simple ecological dynamical
equations are invariant (symmetric) in respect to successive application of the
time reversal transformation - $T$, space coordinates reversal or parity
transformation - $P$, and predator-prey reversal transformation - $C_{E}$ that
changes preys in the predators or pure (healthy) in the impure (fatal)
environment, and vice versa. It is deeply conceptually analogous to remarkable
$CPT$ symmetry of the fundamental physical dynamical equations. Further, it is
shown that by more accurate, "microscopic" analysis, given $C_{E}PT$ symmetry
becomes explicitly broken.
