2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/08/2017 | 11:45 AM - 12:00 PM | WHAT YOU LEAVE BEHIND COUNTS: ABANDONED ECOSYSTEM ENGINEERING STRUTURES FACILITATE COLONIZATION IN A HEADWATER STREAM | 306C
WHAT YOU LEAVE BEHIND COUNTS: ABANDONED ECOSYSTEM ENGINEERING STRUTURES FACILITATE COLONIZATION IN A HEADWATER STREAM
Understanding how organisms mediate ecosystem recovery is increasingly important as streams experience unprecedented levels of disturbance. Our research identifies the influence that net-spinning caddisfly (Hydropsychidae) have on stream macroinvertebrate colonization and seeks to experimentally untangle behavioral and physical mechanisms driving facilitation patterns following drought disturbances. We manipulated caddisfly presence and caddisfly silk retreats on previously dried gravels in a headwater stream. We hypothesized that the silk structures produced by caddisflies may facilitate colonization of coexisting invertebrate taxa, unless territorial behavior overrides such positive effects. Macroinvertebrate density and biomass were significantly higher in caddisfly + retreat and retreat only treatments compared to controls with no caddisflies or retreats, suggesting that caddisflies and their silk facilitated colonization. In addition, we found that the overall facilitation of caddisflies and their silk was not outweighed by their territorial behaviors. The experimentally abandoned silk structures increased macroinvertebrate colonization relative to controls, suggesting a legacy effect of silk on community recovery following a disturbance. Caddisfly larvae may influence colonization through non-exclusive pathways including: streambed stabilization, current shading and/or transferring water column food resources to the streambed.
- C11 Community Ecology
- C20 Climate Change
- C03 Invertebrates
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Presenters/Authors
Benjamin Tumolo
(), Montana State University, bbtumolo@gmail.com;
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Lindsey Albertson
(), Montana State University, lalbertson@stroudcenter.org;
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Wyatt Cross
(), Montana State University, wyatt.cross@montana.edu ;
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Melinda Daniels
(), Stroud Water Research Center, mdaniels@stroudcenter.org;
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leonard Sklar
(), San Francisco State University , leonard@sfsu.edu ;
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