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  • Fiddler crabs  (1)
  • fiddler crab  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Pillar building in the fiddler crab Uca beebei: evidence for a condition-dependent ornament (1995)
    Springer
    Behavioral ecology and sociobiology 36 (1995), S. 185-192 
    Details
    ISSN: 1432-0762
    Keywords: Fiddler crabs ; Condition dependence Sexual selection ; Handicap principle ; Sensory exploitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the fiddler crab (Uca beebei) males build a small mud pillar next to their burrow which increases their attractiveness to females. Three hypotheses were tested to explain inter-male variation in pillar-building. (1) The benefits of pillar-building are density dependent. The experimental addition of vertical structures did not support this hypothesis as there was no change in the level of pillar-building. (2) There are two classes of males (pillar-builders and non-pillar-builders). This could either be due to an alternative mating strategy, or because pillar building is age or size-dependent. There was also no support for this hypothesis. (3) Pillar-building is an honest signal of male quality dependent on body condition. A food supplementation experiment was performed. Addition of food affected several aspects of male behaviour and resulted in a two fold increase in the number of pillars built between control and food treatments (P 〈 0.001). However, the percentage of males building pillars did not increase significantly. Pillar building in this species has been attributed to sensory exploitation. Our results indicate that a trait which may well have evolved through sensory exploitation also appears to be condition-dependent. We emphasise that showing that an ornament or behaviour is condition-dependent does not necessarily mean that it evolved through “good gene” processes. However, in terms of its current selective value, pillar building may be maintained through female choice because it acts as a signal of male condition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00177795
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  • 2
    Electronic Resource
    Electronic Resource
    Nemertean predation on the tropical fiddler crab Uca musica (1997)
    Springer
    Hydrobiologia 365 (1997), S. 233-239 
    Details
    ISSN: 1573-5117
    Keywords: Hoplonemertean ; fiddler crab ; predatory behavior ; anti-predator defenses ; intertidal ; Panama
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We saw 79 predatory interactions between a new speciesof monostiliferous, suctorial hoplonemertean and thefiddler crabs Uca musica (77 cases) and U.stenodactylus (2 cases). At an intertidal sand barin the Pacific entrance of the Panama Canal, worms ateabout 0.1% of the adult crab population per day. Themode of attack and the spatial and temporaldistributions of interactions suggest the worm is anambush predator. When struck by a worm‘s sticky,mucous-covered proboscis, crabs produced copious foamfrom their buccal area. Mucous-laden crabs thatescaped, again foamed indicating that the foam maycounteract the mucus. If the attack led to a kill,the struggling crab soon became quiescent, as istypical in other nemertean-prey interactions. Theworm inverted its proboscis, found ingress to thecrab‘s body and fed. Crabs escaped by autotomizingappendages entwined by the proboscis, by forcefullypulling away and by remaining quiescent, then movingaway when the worm inverted its proboscis and beforeit entered the crab. Immobility, a response to visualpredators, may falsely indicate paralysis to the wormand cause it to invert its proboscis, therebyproviding the crab with an opportunity to escape. This predator-prey interaction seems to incorporategeneralized predator tactics and fortuitous preydefenses that give worms and crabs about an evenchance of success.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003141401259
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