EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

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6/06/2017 | 10:00 AM - 10:15 AM | INSECT PHENOLOGICAL RESPONSES TO SPATIOTEMPORAL TEMPERATURE VARIABILITY IN HEADWATERS OF LOOKOUT CREEK, OREGON | 301A

INSECT PHENOLOGICAL RESPONSES TO SPATIOTEMPORAL TEMPERATURE VARIABILITY IN HEADWATERS OF LOOKOUT CREEK, OREGON

Climate change drives an interest in understanding environmental controls on timing of life-history events (phenology) within and among species. Differential phenological responses of aquatic insects to changing temperature regimes could result in trophic mismatch or local extinction of populations already near their physiological limits. We collected emerging insects April-July at six headwater streams in six consecutive years (2009-2014). Streams represented a range of natural temperature regimes across the topographically complex Lookout Creek watershed in the Oregon Cascades. One mayfly (Paraleptophlebia temporalis), one caddisfly (Dolophilodes dorcus), and two stoneflies (Moselia infuscata, Alloperla fraterna) were common enough spatiotemporally for phenological analysis. We detected three types of response across the four species: 1) direct response to degree-day accumulation across years and sites (Dolophilodes); 2) direct response to degree-day accumulation within sites, but variable responses among sites resulting in coordinated emergence despite inter-site temperature differences (Alloperla, Paraleptophlebia); 3) lengthy annual emergence periods across sites coordinating adult presence at all sites through the season (Moselia). Spatial environmental heterogeneity appears to integrate complex differences among species’ phenological responses, reminiscent of a “portfolio effect” of life-history diversity.

C20 Climate Change
C15 Population Ecology
C28 Land-Water Interfaces & C29 Life Histories

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Presenters/Authors

Debra Finn (), Missouri State University, dfinn@missouristate.edu;