EXPLOSIVE BREEDING AGGREGATIONS AND PARACHUTING IN A NEOTROPICAL FROG, AGALYCHNIS SALTATOR (HYLIDAE)

Agalychnis saltator gathers in spectacular breeding aggregations on li anas above temporary swamps. Both males and females descend to breedin g aggregations by parachuting and return rapidly to the canopy by hand -over-hand locomotion up lianas. Amplecting males are no different in size from single males, and the sizes of males and females in amplexus are not correlated. Unusual characteristics of this species compared to congeners include egg-laying during daylight hours and laying grey eggs that are packed into moss on lianas. Sources of egg mortality inc lude desiccation, submergence in water, and predation by ants, snakes, and birds. Parachuting and walking may both be efficient locomotor mo des that enable frogs to live in the dispersed habitat of the canopy a nd yet gather in a short amount of time for explosive breeding at isol ated ponds.