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Seasonal influence and local factors affecting macroinvertebrate structure in a high-altitude Andean stream

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Abstract

Small water bodies are critical for maintaining freshwater biodiversity, but are among the least investigated aquatic environments. We examined physical and chemical variables at two reaches in Arroyo Tambillos, a small, high-elevation Andean stream, in NW Mendoza province, Argentina, across four seasons to examine how local factors and seasonality affected the structure of the macroinvertebrate community. The Arroyo Tambillos community was numerically dominated by ephemeropterans (mainly Massartellopsis irarrazavali) while the dipteran Chironomidae were the most species rich. Total macroinvertebrate abundance was highest in summer, driven mainly by taxa that were secondary in dominance (Austrelmis sp. and Andesiops peruvianus), while richness did not differ between seasons. However, benthic composition was different in Fall 2013 (March) compared to other seasons, largely because of the increased abundance of Chironomidae. Canonical correspondence analysis discriminated Chironomidae species distributions in Fall 2013 by substrate type (i.e., big and small boulder substrate). By contrast, discharge, velocity, and depth were the variables which most affected the macroinvertebrate abundance and distributions. Contrary to our expectations, most community changes observed occurred in fall instead of summer. Nivo-kryal stream communities like the one described here have become increasingly important for conserving mountain stream biodiversity as anthropogentic impacts and climate change increasingly impact lower stream reaches. Therefore, monitoring high-altitude streams like the Arroyo Tambillos may be critical for preventing the future loss of unique and sensitive stream biota.

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Acknowledgements

We especially want to thank John Schoen, Zach Snobl, Chris Wojan, Ong Xiong, Jesús Gómez and Gustavo Burgos for their help and support in the field. Thanks also to the Zapata family for giving us permission to work on their property, and to Hugo Debandi and Gualberto Zalazar for their superb driving and assistance in the field. Kim Wellnitz served as “Grupo Monte” translator, photographer, and disperser of good cheer. We are especially grateful to Analia Paggi for her help in Chironomidae determination. We also thank Milagros Jefferies for help in the design of Figure 1, and Benjamin Bender for helping us formatting the figures as requested by the journal. Funding was provided by the National Science Foundation (NSF DEB-06-42512 to T.W.) and UW - Eau Claire’s Center for International Education. This study was supported by Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. The authors appreciate also the constructive comments from the editor and the anonymous reviewers.

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Correspondence to Erica E. Scheibler.

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Scheibler, E.E., Fernández Campón, F., Lagos Silnik, S. et al. Seasonal influence and local factors affecting macroinvertebrate structure in a high-altitude Andean stream. J. Mt. Sci. 17, 1374–1386 (2020). https://doi.org/10.1007/s11629-019-5813-0

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  • DOI: https://doi.org/10.1007/s11629-019-5813-0

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