  Some mathematical models for the estimation of the effects of Cry1Ab and
Cry1F Bt-maize exposure in the biodiversity are discussed. Novel results about
these models are obtained and described in the note. The exact formula for the
proportion of the population that suffers mortality exposed to Cry1Ab pollen,
underlining its dependence on the margin from the Bt crop edge, is derived. In
addition, regarding Cry1F pollen effects, it is proposed a procedure, using a
probabilistic and statistical approach, that computes the width of the non
Bt-stripes used as mitigation measures. Finally, it has been derived a lower
bound, using probabilistic consideration, on the species sensitivity of
Lepidoptera.
