A biome is a geographically defined area of ecologically similar communities of plants, animals, and soil organisms, often referred to as ecosystems.

This is typically done through examination of reference streams (physically and ecologically similar streams in stable, natural condition) and by methods of stream classification based on morphological features.

From what can be inferred from the mouthplates of fossil specimens, the acanthothoracids were ecologically similar to modern-day chimaeras, being a clique of shellfish hunters.

Zebra mussels and the closely related and ecologically similar quagga mussels are filter-feeding organisms.

Ecologically similar species do exist but it is unlikely that these species are able to eliminate those mussels already established and will have a limited role in their control.

It is closely related and ecologically similar to the zebra mussel, Dreissena polymorpha.

In the western Indian Ocean, this genus appears to be replaced by the ecologically similar genus Holohalaelurus.

The addition (or loss) of species which are ecologically similar to those already present in an ecosystem tends to only have a small effect on ecosystem function.

In selecting study sites, the environment can be characterized in detail at the study sites to ensure sites are ecologically similar and therefore less likely to have confounding variables.

Its abundance may be a result of the absence of ecologically similar competitors.