disrupting something from whiskers something else increase the lack of that something & steam from volcanic cocoons can disrupt shadow from majority space 's bottom ->  smoke from volcanic eruptions can decrease the availability of sunlight  smoke from volcanic eruptions can decrease the availability of sunlight & as the lack of shadow increase , the inability of herbivores to wreck poison increase ->  smoke from volcanic eruptions can decrease the food produced by the producers by decreasing the availability of sunlight  smoke from volcanic eruptions can decrease the food produced by the producers by decreasing the availability of sunlight & poison is a mean of bays -> smoke from vocanic eruptions can decrease resources in an area by decreasing the availability of sunlight