2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 10:15 AM - 10:30 AM | CHARACTERIZING TERRESTRIAL ARTHROPOD ASSEMBLAGES IN DRY STREAMS: ASSOCIATIONS WITH NATURAL GRADIENTS AND ANTHROPOGENIC STRESSORS | 151 G
CHARACTERIZING TERRESTRIAL ARTHROPOD ASSEMBLAGES IN DRY STREAMS: ASSOCIATIONS WITH NATURAL GRADIENTS AND ANTHROPOGENIC STRESSORS
As perennial river systems become increasingly intermittent worldwide and dry phases become more common, there is a growing need to focus attention on characterizing the terrestrial assemblages that inhabit dry channels. Recent work has highlighted the use of terrestrial arthropods as biological indicators of ecological health, but the mechanisms driving biological responses to human activities and their direct causal networks are poorly understood. We assessed the relationships between environmental gradients and terrestrial arthropods sampled in the San Diego region to determine their response to natural variation in the absence of human activities. We explained between 11-55% of variation in 20 arthropod responses as a function of 14 local catchment and watershed scale measures of environmental gradients. Arthropods showed consistent responses to several natural factors, including decreased richness with increased slope and increased abundance with increased precipitation. We also assessed the relationship between the terrestrial arthropods and watershed measurements of land use and found that some taxa decreased in response to alteration, but many increased. Understanding the natural responses of terrestrial arthropods to environmental variation may provide insight into how human activities may alter terrestrial arthropod assemblages in dry streams.
- Intermittency
- Bioindicators
- Aquatic-terrestrial Linkage
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Presenters/Authors
Matthew Robinson
(), California State University Monterey Bay, marobinson@csumb.edu;
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Raphael Mazor
(), Southern California Coastal Water Research Project, raphaelm@sccwrp.org;
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John Olson
(), Dept of Applied Environmental Science, California State University Monterey Bay, CA, USA, joolson@csumb.edu;
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