Like in most other d-block groups, the abundance in Earth's crust of group 12 elements decreases with higher atomic number.

Outside this radius, the abundance of metals steadily decreases with increasing distance from the core.

The abundance of C in the atmosphere and in living organisms is almost constant, but decreases predictably in their bodies after death.

The abundance of bats however has been decreasing rapidly due to a habitat loss of over 95%.

However, in our study, we found that fungal abundance and richness decreased as the number of consecutive days without freezing increased.

It is considered to be moderately common and is regularly recorded, but its abundance is decreasing.

Colder summer temperatures cause the size, abundance, productivity and variety of plants to decrease.

Its abundance has decreased due to overcollecting in some areas.

The abundance of the Military Macaw has now decreased to less than 10,000 globally.

However it is rare to find dollar sunfish in its western range, the abundance has decreased a lot over the past twenty years.