EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
6/05/2017 | 9:30 AM - 9:45 AM | THE COLORADO RIVER BASIN: AQUATIC INSECT DIVERSITY AND DISTRIBUTION IN A FRAGMENTED RIVERSCAPE | 305A
THE COLORADO RIVER BASIN: AQUATIC INSECT DIVERSITY AND DISTRIBUTION IN A FRAGMENTED RIVERSCAPE
Studies of large rivers are often confined to small and, arguably, inadequate spatial scales due to the logistical challenges of sampling large rivers particularly in remote areas. We collaborated with hundreds of river runners to collect emergent aquatic insects for two years (2015-2016) using light traps deployed along 6 rivers of the Colorado River basin from Wyoming to Arizona, a cumulative distance exceeding 2,000 rkm. We compared 828 samples collected from 410 sites upstream of Lake Powell reservoir with 2,573 samples collected from 1,247 sites downstream of the reservoir. We use these data to describe patterns of species distribution and emergence phenology for aquatic insects on local and regional scales within a major watershed. We found diversity to be significantly greater in the dendritic river network upstream of Lake Powell than downstream in the linear and dam-regulated Colorado River through Grand Canyon. Our results provide insight on the diversity, distribution, and dispersal of aquatic insects in a fragmented riverscape.
- C28 Land-Water Interfaces
- C18 Biodiversity
- S21 Practical applications of metacommunity theory in stream and river management
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Presenters/Authors
Anya Metcalfe
(), US Geological Survey Grand Canyon Monitoring and Research Center, ametcalfe@usgs.gov;
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Ted Kennedy
(), USGS Southwest Biological Science Center, Grand Canyon Monitoring and Research Center, tkennedy@usgs.gov;
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Jeffrey Muehlbauer
(), USGS Grand Canyon Monitoring and Research Center, jmuehlbauer@usgs.gov;
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Jane Marks
(), Northern Arizona University, jane.marks@nau.edu;
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