A question on synapses
According to this research paper by Lockary and Goodman, the resting membrane potential of C.Elegans is two fold because its a stepped resting potential of -70mV and -35mV. After an initial activation a resting potential of -35mV is held following a higher depolarisation, so on your graph the initial depolarisation would be a little higher, and then drops to -35mV for roughly 60+ secs. When terminated, or receiving a inhibitory signal this drops to -70mV. I don't see any reason why the receiving neuron would respond any differently so long as the activation strength was enough to create positive depolarisation. As mentioned by Izhaki in the comments, the strength of the synapse connections plays an important role. Here is a good thesis on transfer between neutrons in C.Elgans, it also explains the methods to investigates neutrons in the central nervous system of C.Elegans, and seems to see two patterns of activation depending on the method applied. Only a few of the neutrons have been fully recorded in C. Elegans so its possible that different potential patterns may occur, nervous systems are far from homogeneous, humans appear to use more than one type.   

I can't respond anymore than this at the moment as I don't have time for the extra reading but I hope this is at least useful.