SEE HERE), and efts are terrestrial and highly mobile. Because of the efts' overland mobility, it is no mystery why newts can quickly colonize vernal pools.
Both newts and larval marbled salamanders are voracious predators of frog and salamander eggs. The pools that we examined were full of both species, eating their way through the jellied masses of amphibian spawn.
Between the egg-eating newts and marbled salamander larvae, scads of wood frog and other species' eggs are consumed. These predators are probably a factor that has led to the carpet-bombing strategy of egg laying for other vernal pool amphibians. If they can just produce enough eggs, some will survive the ravages of the predators.