Abstract
The mayfly Cloeodes hydation (Baetidae, Ephemeroptera) inhabits ephemeral, rain-filled rock pools as well as pools, springs, and brooks of longer duration in savanna woodlands of the northern Pantanal region, Brazil. Larvae have the ability to tolerate repeated exposure to air for up to 9 h at a time, as confirmed by laboratory experiments. This tolerance is apparently advantageous in the highly dynamic, unpredictable habitat conditions, especially when pools are successively wet and dry almost daily during the end of the rainy season. Survival of larvae depended on the presence of sediment, and was always followed by moulting. Inducible and repeated moulting showed that numbers of moults and instars were not always indicative of development. We present data on C. hydation abundance in 2 rock pools throughout 1 y. From these data, larval development was estimated to require between 19 and 25 d (24-29°C).
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