In ecological succession, large herbivores would most likely come first when forming an established ecosystem.
Ecological succession is the series of processes that alter the species structure of an ecological community over time.
Ecological succession can either be primary or secondary depending on whether there was an initial life form or not.
However, producers like plants, algae tend to grow first in both cases. Hence, herbivores that will consume them are the most likely come first when forming an established ecosystem.
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