Slide 1
Cleaner wrasses eat parasites from client fish
Cleaner wrasses remove small parasites and material from larger client fish. The cleaner gains food while the client can benefit from the visit.
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Clients may approach particular cleaning locations and tolerate close contact. An interaction that would otherwise look dangerous becomes possible because feeding and maintenance create compatible benefits.
Slide 2
Eating client mucus can disrupt the exchange
A cleaner may prefer eating some client mucus rather than parasites. That choice can hurt the client and disrupt the encounter.
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The partnership is therefore not automatically harmonious. Its persistence requires considering the options of both fish, including whether a dissatisfied client can leave and obtain service elsewhere.
Slide 3
A departing client removes the cleaner’s reward
A client that swims away ends a cleaner's feeding opportunity. This response can make continued cooperation more rewarding than taking one unwanted bite.
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Researchers study these choices through observed interactions and experiments. Terms such as cheating describe who gains or loses; they do not require fish to hold human moral beliefs.
Slide 4
Watching clients can influence the cleaner’s behaviour
Experiments found that cleaner wrasses changed behaviour when potential clients watched. Observers can influence the value of cooperating in the present encounter.
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A bystander may choose whether to approach after seeing treatment of another fish. The immediate meal can therefore affect later feeding opportunities through information available to other clients.
Slide 5
Cleaning depends on the wider reef community
Cleaning interactions link many reef species. Their value depends on parasites, clients and the availability of suitable cleaners in the community.
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One study of one cleaner species cannot describe every cleaning partnership. Comparing sites and species helps separate a general ecological principle from behaviour that depends on a particular setting.
Sources
- Pairing up is better than being single in the sea
University of Queensland
- One bite can destroy a reputation
University of Queensland