Calcivorous

Calcivorous is an adjective used to describe organisms that consume or utilize calcium-rich substances, particularly rocks or minerals, as a primary source of nutrition. This dietary strategy is rare in the animal kingdom and is more commonly observed in certain microorganisms, such as bacteria and fungi. These organisms may secrete enzymes that break down calcium carbonate or other calcium-bearing compounds, allowing them to absorb the released nutrients.

In some geological contexts, the term calcivorous can also refer to biological processes that contribute to the formation or alteration of calcium-rich geological formations. For instance, the activity of calcivorous microorganisms can play a role in processes like biomineralization or weathering. While the direct consumption of rocks by macroscopic animals is not a widespread phenomenon, some invertebrates may ingest calcium-containing sediments or shells as a means of obtaining calcium for their own skeletal or shell development. These instances are typically supplementary to other food sources rather than a sole reliance on calcivorous feeding. The study of calcivorous organisms can provide insights into biogeochemical cycles and the interactions between life and geological environments.