2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/27/2021 | 2:00 PM - 3:30 PM | FOOD-WEB COMPLEXITY AND BASAL RESOURCE SHIFTS ALONG A PRECIPITATION GRADIENT | Virtual Platform
FOOD-WEB COMPLEXITY AND BASAL RESOURCE SHIFTS ALONG A PRECIPITATION GRADIENT
In the American Southwest, conditions are expected to become more arid throughout the next century. Subsequent changes in streamside vegetation could alter nutrient, carbon, and light inputs to streams and fundamentally alter stream primary production and energy flow. To enhance our understanding of how freshwater communities will adjust to these shifts in water-cycle dynamics, we employed a space-for-time substitution along a precipitation gradient from semi-arid to sub-humid on the Texas Coastal Plain. In March 2019, we sampled filamentous algae, leaf litter, macroinvertebrates, and fishes from three wadeable streams spanning the precipitation gradient. The samples were analyzed for stable isotopes of 13C, 15N, 2H, and 18O. We used Bayesian mixing models to estimate in-stream versus terrestrial basal carbon sourcing, and we compared food-chain length and niche widths of abundant taxa. Mean ??13C values differed significantly among the stream communities, and food webs increasingly utilized carbon from terrestrial sources with greater precipitation. Food-chain length and niche width estimates were higher in the mesic and sub-humid sites compared to the semi-arid site. These results indicate that small changes in precipitation in this region may result in cascading bottom-up effects on stream communities.
- Climate change
- Food webs
- Carbon cycle
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Presenters/Authors
Sean Kinard
(), Virginia Institute of Marine Science, s2kinard@gmail.com;
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Hannah Vander Zanden
(), UF, hvz@ufl.edu;
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Matt Whiles
(), University of Florida, mwhiles@ufl.edu;
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Amber Ulseth
(), Sam Houston State University, amber.ulseth@epfl.ch;
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Brandi K. Reese
(), Texas A&M Corpus Christi, brandi.reese@tamucc.edu;
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Christopher Groff
(), Texas A&M Corpus Christi, cgroff@islander.tamucc.edu;
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Bradley Strickland
(), Virginia Institute of Marine Science, bstrickland@vims.edu;
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Fernando Carvallo
(), Texas A&M University–Corpus Christi, fcarvallo@islander.tamucc.edu ;
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Victoria Jenkins
(), Texas A&M Corpus Christi, vjenkins@islander.tamucc.edu;
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Alexander Solis
(), VIMS, alexander.tr.solis@gmail.com;
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Desiree Corbiere
(), Texas A&M University-Corpus Christi, Desiree.Corbiere@tamucc.edu;
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Christopher Frazier
(), Texas A&M Corpus Christi, christopher.frazier@tamucc.edu;
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Connor Brown
(), Sam Houston State University, clb150@SHSU.EDU;
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James Hogan
(), Texas A&M University – Corpus Christi, james.hogan@tamucc.edu;
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Christopher Patrick
(), Virginia Institute of Marine Science (VIMS), cpatrick@vims.edu;
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