Atypical ecology of Pantala flavescens (Fabr.) on Easter Island (Anisoptera: Libellulidae)
Odonatologica , Volume 20 - Issue 1 p. 45- 51
P. flavescens on Easter Island exhibits peculiar life history adaptations not documented from populations elsewhere. Adults seem to have abandoned the long-distance dispersal behaviour for which this circumtropical dragonfly species is notorious. They are relatively poor flyers, show a tendency to aggregate and forage in windsheltered areas, and display a perching reflex at sudden windrises. — The sp. reproduces in the major crater lakes, as well as in several smaller ponds that occur scattered around the island. In the crater lakes, young larvae are preyed upon by introduced Gambusia fish. Medium to fullgrown larvae escape predation (through protection provided by abdominal spines?), but are subject to chronic starvation because of the overall scarcity of suitable prey. — Selection for non-migrating behaviour may explain the behaviour of Easter Island P. flavescens. Poor larval nutrition is considered to have been the key epigenetic initiating factor.
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