Please help! I will appreciate any information to help better understand.

Consider a 2-dimensional beetle model: the JA model. Here we will com- bine the larvae and pupae into a juvenile stage Jt. The time step is approximately 4 weeks, the sum of the durations of these stages. Assume that the egg stage can be ignored; in the absence of cannibalism, the per capita juvenile recruitment rate is a constant b > 0 juveniles per adult per unit time; in the presence of cannibalism, the juvenile recruitment rate is decreased by a Ricker factor of the form e-CejJ due to cannibalism of eggs by larvae; in the presence of cannibalism, the juvenile recruitment rate is further decreased by a Ricker factor of the form e-Cea A due to cannibalism of eggs by adults; in the absence of cannibalism, there are no juvenile deaths; in the presence of cannibalism, the juvenile survivorship is further decreased by a Ricker factor of the form e-Cja A due to cannibal- ism of juveniles by adults; a fraction Ma of adults die per unit time, where 0 0 juveniles per adult per unit time; in the presence of cannibalism, the juvenile recruitment rate is decreased by a Ricker factor of the form e-CejJ due to cannibalism of eggs by larvae; in the presence of cannibalism, the juvenile recruitment rate is further decreased by a Ricker factor of the form e-Cea A due to cannibalism of eggs by adults; in the absence of cannibalism, there are no juvenile deaths; in the presence of cannibalism, the juvenile survivorship is further decreased by a Ricker factor of the form e-Cja A due to cannibal- ism of juveniles by adults; a fraction Ma of adults die per unit time, where 0