Abstract
Many lotic ecosystems are spatially and temporally heterogeneous but none more so than dryland streams flowing through arid and semi-arid landscapes. Understanding seasonal variation in richness and trait composition is critical to our fundamental understanding of these dynamic stream networks. Here, we analyzed aquatic macroinvertebrate communities within perennial and intermittent reaches in replicate dryland watersheds in southwestern USA across 10 seasons and 4 years. We quantified how hydrology, season, and microhabitat type affected taxa richness and trait composition. Taxa richness was higher in perennial than intermittent reaches, in pools than riffles, and in fall and summer than in spring. The interaction between hydrology and season was important; the difference between fall high and spring low richness was greater in intermittent than perennial streams. Hydrology was the main predictor of trait composition; intermittent streams supported a larger fraction of small taxa, taxa with the ability to undergo diapause, and uni- or multivoltine taxa (i.e., taxa with shorter life cycles). Trait composition did not vary across seasons among perennial reaches whereas the fraction of aerial dispersers appeared to be greater in spring than other seasons among intermittent reaches. Our results were largely consistent with predictions of the habitat templet; r-selected traits were more frequently represented in intermittent communities. The temporal characterization of macroinvertebrate community structure in dryland streams provides a powerful glimpse of how stream communities may respond to a drying climate.
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Acknowledgements
Funding was provided by the US Department of Defense (SERDP RC-1724, RC-2203, RC-2511). We thank Sheridan Stone for logistical support at Fort Huachuca, and Brooke Gebow and the Nature Conservancy for access to streams and lodging at the Ramsey Canyon Preserve, Arizona. This manuscript benefited from the valuable comments of two anonymous reviewers.
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XG led writing of the manuscript. XG and WC analysed data. JDO and DAL designed study. DAL and TAS performed field work and collated trait data. RVD led taxonomic identifications. All authors contributed to the writing of the manuscript.
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Giam, X., Chen, W., Schriever, T.A. et al. Hydrology drives seasonal variation in dryland stream macroinvertebrate communities. Aquat Sci 79, 705–717 (2017). https://doi.org/10.1007/s00027-017-0530-7
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DOI: https://doi.org/10.1007/s00027-017-0530-7