2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/05/2017 | 10:00 AM - 10:15 AM | FORESTS, WOOD, STREAMS, AND SPIDERS: LINGERING EFFECTS OF LAST CENTURY’S STRESSORS ON AQUATIC-RIPARIAN LINKAGES | 301A

FORESTS, WOOD, STREAMS, AND SPIDERS: LINGERING EFFECTS OF LAST CENTURY’S STRESSORS ON AQUATIC-RIPARIAN LINKAGES

In the Colorado Front Range (USA), disturbance history dictates stream planform. Undisturbed, old-growth streams have multiple channels and large amounts of instream wood and depositional habitat, while disturbed streams (wildfires and logging >100 years ago) are single-channeled with mostly erosional habitat. We tested how these opposing stream states influenced organic matter storage, benthic macroinvertebrate secondary production, emerging aquatic insect flux, and riparian spider biomass. Organic matter storage and macroinvertebrate production did not differ among sites per unit area (m^-2), but values were 2× to 21× higher in undisturbed reaches per unit of stream valley (m^-1 valley) because total stream area was higher in undisturbed reaches. Insect emergence was similar among streams at the area and valley scales. However, insect emergence per meter of stream bank was lower in undisturbed sites because multithread channel reaches had 3× more stream bank per meter of valley than single-channel reaches. Riparian spider biomass followed the same pattern, and we attribute this to the multi-thread channels at undisturbed sites diluting the amount of prey (emerging aquatic insects) reaching the stream bank (riparian spider habitat).

C25 Food Webs
C32 Primary and Secondary Production
S14 Stressors in linked aquatic-terrestrial ecosystems: New developments and solutions

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Presenters/Authors

David Walters (), US Geological Survey, waltersd@usgs.gov;