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Ant–fungus mutualism is a symbiosis seen between certain ant and fungal species, in which ants actively cultivate fungus much like humans farm crops as a food source. There is only evidence of two instances in which this form of agriculture evolved in ants resulting in a dependence on fungi for food.
The use of the term "agriculture", which may not be entirely appropriate for mutualistic relationships—particularly in cases where a colony is hosted by a plant, such as a tree, in exchange for protection and aid in its survival and growth—is well documented in the scientific literature for processes where ants create crops and directly cultivate plants or fungi.
Though workers can also eat the hyphae of the fungi, which is richer in protein, they prefer staphylae and appear to live longer while eating them. [35] [68] [69] Cellulose has been found to be poorly degraded and assimilated by fungus, if at all, meaning that the ants that eat the fungus do not get much energy from the cellulose in plants.
Most organisms forage, hunt, or use photosynthesis to get food, but around 50 million years ago — long before humans were around — ants began cultivating and growing their own food.
The food is first ground to a bread-like consistency using the ants' large mandibles, and is then stored in a granary, assuring the colony access to food year-round. Seed collection on behalf of the red harvester ants benefits their ecosystem through the process of myrmecochory , in which ants aid in the dispersal of seeds while foraging for food.
Harvester ants foraging in hot, dry conditions lose water, but obtain water from metabolizing fats in the seeds they eat. Positive feedback on foraging activity, from returning foragers with food, allows the colony to regulate its foraging activity according to the current costs of desiccation and the benefits based on current food availability.
Honey ants are unique in using their own bodies as living storage, used later by their fellow ants when food is otherwise scarce. When the liquid stored inside a honeypot ant is needed, the worker ants stroke the antennae of the honeypot ant, causing the honeypot ant to regurgitate the stored liquid from its crop. [4] [5]
Carpenter ants are considered both predators and scavengers. These ants are foragers that typically eat parts of other dead insects or substances derived from other insects. Common foods for them include insect parts, "honeydew" produced by aphids, and extrafloral nectar from plants. They are also known for eating other sugary liquids such as ...
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