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ethocline


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  • Ecology and Conservation
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A progressive change in the pattern of behaviour of a group of closely related organisms, the more complicated patterns often being associated with more recently evolved members of the group, which evolved from members exhibiting a more primitive pattern. For example, variations in courtship behaviour among species of Hilaria flies (Empididae) suggest an evolutionary lineage: (a) a male searches for a female and courts her in isolation; (b) a male captures a fly, presents it to a female, and she consumes it before mating; (c) a male captures a fly, joins a swarm of males, presents the fly to a female, and she consumes it before mating; (d) as (c), but the male adds a few strands of silk to the fly before joining the swarm; (e) as (d), but the male covers the fly in silk; (f) as (e), but the male eats the edible portion of the fly, leaving the husk wrapped in silk; (g) males of non-carnivorous species use dried insect fragments or petals, around which they weave a silken balloon before joining the swarm; (h) the male makes only a balloon (i.e. containing nothing) before joining the swarm.

Subjects: Ecology and Conservation — Zoology and Animal Sciences.


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