A theoretical model developed by Stone describing a three-level trophic system in the Ocean is analysed. The system consists of two distinct predator-prey networks. linked by competition for nutrients at the lowest level. There is also an interaction at the level of the two preys. https://cxpqlnxjxwvn7.dsiblogger.com/67920582/where-do-these-bugs-come-from-phenotypic-structure-of-triatoma-infestans-populations-after-control-interventions-in-the-argentine-chaco