Phoresy

Definition

A temporary, non-parasitic association in which a smaller organism attaches to a larger, more mobile host solely for transport to a new habitat or resource. Unlike parasitism, the phoretic organism neither feeds on nor harms the host during transit; the relationship ends once the passenger disembarks.

Etymology

From Greek phorēsis, a carrying, from pherein, to bear or carry.

Example

Pseudoscorpions (Arachnida: Pseudoscorpiones) use their chelae to grasp the legs of flies (Diptera), allowing them to travel between decaying logs or leaf-litter patches; flower mites (Tarsonemidae) ride on foraging bees to reach fresh blossoms.

Synonyms

• phoresis

Related Terms

• commensalism
• Symbiosis
• ectoparasitism
• Dispersal
• hitchhiking
• mite
• pseudoscorpion

Usage Notes

Phoresy is distinguished from parasitism by the absence of feeding or injury to the host during the transport phase; however, the same organism may be parasitic at other life stages. The term applies broadly across taxa—mites, nematodes, and even seeds can be phoretic—but is most frequently discussed in arthropod literature. Some authors restrict 'phoresy' to arthropod-arthropod interactions and use 'phoresis' more broadly, though the two are often treated as synonyms.