Life-history and Behavioural Adaptations to Flow Regime in Aquatic Insects

نویسنده

  • DAVID A. LYTLE
چکیده

Evolutionary history determines how aquatic insects cope with extreme fl ow events, both natural and anthropogenic. From a macroevolutionary point of view, aquatic insects possess different modes of adaptation (morphological, behavioural, or life history) to cope with fl ow events. For example, some Ephe meroptera, Plecoptera and Trichoptera are adapted to long-term average cycles of fl ood and drought via life-history timing, while other groups with aquatic adults (Hemiptera and Coleoptera) may use rain-triggered behavioural responses to escape fl oods on a per-event basis. From a microevolutionary point of view, populations may also evolve in response to fl ow regimes at very local scales. Models of life-history and behavioural evolution illustrate how disturbance regime characteristics (timing, frequency, predictability of events) and population structure (courseversus fi ne-grained, organism lifespan) determine how populations might evolve in response to different fl ood or drought regimes. All of these factors have implications for the structure of natural lotic insect communities, and for the effective management of dammed rivers and streams using ecological fl ows.

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تاریخ انتشار 2008