These invertebrates then become a major food source for fish.
For the Galápagos iguanas, that means less algae, their major food source.
That, in turn, can affect levels of phytoplankton, a major food source for many organisms.
Local fauna and flora, including periwinkles - a major food source for local people - had died out.
Cereal grasses of the Triticeae tribe have been the major food source in temperate regions since the dawn of agriculture.
Ecological Role: This plant is a major food source for many birds and mammals, especially during the winter.
Sea temperature changes are threatening the availability of sandeels, a major food source for seabirds including kittiwakes and guillemots, whose colonies in Scotland have seen major population crashes.
The blue whale's major food source, krill, has declined 80percentt in the Southern Ocean, probably a direct effect of global warming.
Diving beetles are not generally considered beneficial because they eat fish and compete with them for food and space without providing them with a major food source.
Plantains, cassava (manioc), sugarcane, yams, and peppers are grown; some domestic animals are raised, but they are not a major food source.
Pollinators like bees and butterflies ensure crop production, oysters and mussels filter water, and invertebrates ranging from mosquitoes to shrimp serve as a major food source.
