Population Numbers for Each Level
420 different species of plants
40 different species of mammals
240 different species of birds
40 different species of mammals
240 different species of birds
In this trophic pyramid there are different levels depending on the species living in the ecosystem. Second Level At the second trophic level are herbivores animals that eat plants or other primary
producers. They are the primary consumers. Cows and horses are herbivores, as
are caterpillars and some ducks. A herbivore must be able to break down a plant’s
molecules into usable compounds. However, the ability to digest cellulose is a
chemical feat that only a few organisms have evolved. As you will recall,
cellulose is a complex carbohydrate found in plants. Most herbivores rely on microorganisms,
such as bacteria and protists, in their gut to help digest cellulose. Humans
cannot digest cellulose because we lack these particular microorganisms. The population at Glacier Bay is very large and even too many to know many of each animal there specifically is.