This evening Mike R. and I were discussing the purpose of male fiddler
crab claw displays. We were following up on a conversation that took
place while we were out by the marsh on Prudence this afternoon. Found
the following article that I thought might be of interest and answer
some questions.
http://richard.eriophora.com.au/pubs/pdf/HowHemmiZeilPeters-07.pdf
MARTIN J. HOW, JAN M. HEMMI, JOCHEN ZEIL & RICHARD PETERS, Claw waving
display changes with receiver distance in fiddler crabs, Uca perplexa,
ANIMAL BEHAVIOUR, 2008, 75, 1015-1022.
(Please forgive the poor citation formatting. Just did some quick
copying and pasting.)