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Pastimes : Clown-Free Zone... sorry, no clowns allowed -- Ignore unavailable to you. Want to Upgrade?


To: Box-By-The-Riviera™ who wrote (180107)7/15/2002 8:10:27 PM
From: MythMan  Read Replies (1) | Respond to of 436258
 
you are sick -g-



To: Box-By-The-Riviera™ who wrote (180107)7/15/2002 9:56:56 PM
From: Giordano Bruno  Read Replies (1) | Respond to of 436258
 
Clownfish know their place

Clownfish stay small to avoid eviction. Groups of them live in sea anemones, and new tenants limit their growth so as not to incur the wrath of established incumbents.
If a fish is removed, smaller fish put on a growth spurt to take its place. "It's a perfect queue," says Peter Buston of Cornell University in Ithaca, New York. "No one ever jumps the queue and no one ever moves between anemones. They just wait...."

... The biggest fish is always a female about 65 mm long. Fish change sex as well as size as they move up the social ladder...

A young fish's only hope is to be taken on as a junior partner - which the incumbents do not always allow - and hope that those above it eventually disappear.
"The animals are prisoners," comments zoologist Mark Abrahams of the University of Manitoba in Winnipeg, Canada. "They're being forced into a cooperative social system...."

Abrahams wonders why large subordinates do not seek out vacancies on other anemones. "If you're in a large colony, there could be a big benefit of moving to another location," he says.
But travel between anemones is prohibitively dangerous, explains Buston: "There's an exceptionally high probability of being preyed upon if they try to move."

nature.com

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