The first trophic level, which are the producers

R. Abel has written:

'The trophic ecology of Cottus gobio (L.)'

Silvia Opitz has written:

'Trophic interactions in Caribbean coral reefs' -- subject(s): Coral reef ecology, Food chains (Ecology)

A. Kimo Morris has written:

'A model of trophic evolutionary pathways' -- subject(s): Mathematical models, Parasites, Ecology, Food chains (Ecology), Parasitism

auto must be meaning automatic,they can make there own food and trophic must be ecology of or involving the feeding habits or food relationship of different organisms in a food chain. by sharandeep bose