Long-Term Effects of the Cleaner Fish Labroides dimidiatus on Coral Reef Fish Communities

are potentially also the consequence of indirect effects on fish health. For example, aggression from a piscivore towards nearby fish is reduced in the presence of; this could, in turn, increase prey growth. This is the first time the presence of a cleaner organism has been shown to benefit client individuals and confirms that cleaning is indeed a mutualism at this location, providing a firm foundation for studies of cooperation using this system .

While the species richness of resident fish per reef was not affected by cleaner presence after 18 months, it was lower after 8.5 years on reefs without cleaners. These results suggest that this effect of cleaners became apparent during this period. After 8.5 years, residents were also 37% less abundant, a parameter never previously measured. That the abundances ofwere not affected by cleaner presence, however, indicates that only the abundance of some species was affected.

This is the first study to consider juveniles separately from adult clients. The abundance of visitor juveniles was 65% lower in the absence of cleaners, suggesting that cleaner absence may decrease recruitment success or increase post-settlement migration of visitor species. Indeed, attacks by single parasitic gnathiid isopods decrease the successful settlement of, and many visitor juveniles settle at a similar size .

compared with control reefs both after 18 months and 8.5 years. This indicates the pattern likely persisted during this period. After 8.5 yrs, the Simpson's diversity index was also affected by cleaner presence but this was related to reef area, with a decrease with decreasing reef area on reefs without cleaners and no association with area on controls.

Visitor clients, by definition, are more likely to modify their movements to search for cleaners, as these clients have the ability to select from several cleaning stations within their larger home ranges

Source: Entertainment Trends (entertainmenttrends.net)

Cambridge_Uni 珊瑚の白化を経て、オニヒトデなんかはどうしてるんでしょうね😂

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