Abstract
Chironomid larvae assemblages were investigated at seven sampling stations in relation to stream habitat type in the Challhuaco-Ñireco river system located in the Nahuel Huapi National Park, in the North-Western part of Rio Negro Province, Argentina. A total of 2229 individuals were sampled and 43 Chironomidae taxa were recorded with Orthocladiinae (29) being the best represented subfamily, followed by Diamesinae (5), Tanypodinae (3), Podonominae (3) and Chironominae (3). Stictocladius spF, Cricotopus (Paratrichocladius) sp6, Cricotopus sp2, Cricotopus sp3 and Parapsectrocladius sp2 were the most abundant taxa. Sites near the source of the river system were dominated by Podonomus sp., Limnophyes sp., Parapsectrocladius sp. and Stictocladius spF, whereas sites close to the river mouth were dominated by Diamesinae sp5 and Cricotopus sp. Rank/abundance plots show that all the analysed sites displayed dominance of some species. Stictocladius spF, Cricotopus sp2, Cricotopus sp3, Cricotopus (Paratrichocladius) sp6, Parapsectrocladius sp. and Limnophyes sp. resulted as dominant species, or being part of a group of dominant species, at least in one sample. Eleven taxa were associated with habitats related with riffle areas and stable substrates with filamentous algae. Species–environment relationships were examined using ordination analysis. Elevation was the most significant environmental variable that explained 22% of the total variability of the chironomid assemblages, showing stronger relationships among sites within an altitudinal gradient than among habitat type. Abundance of chironomids increased from headwaters to the outflow in Nahuel Huapi Lake responding to an altitude gradient as well as some environmental factors such as coarse matter and nutrient concentrations.
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Acknowledgments
The authors wish to thank Jorge Donadelli (ILPLA) for the physicochemical water analysis and park rangers of Parque Nacional Nahuel Huapi for helping us in logistic support and for granting authorization to collect, Mónica Caviglia for English proofreading. The paper is a Scientific Contribution N° 968 of the Institute of Limnology “Dr. R.A. Ringuelet” (ILPLA, CCT-La Plata, CONICET, UNLP). This paper is supported by CONICET and Darwin Initiative “Capacity Building for Biodiversity Studies in Freshwater Insects” (Ref. 15025).
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Mauad, M., Siri, A. & Donato, M. Does Type of Substratum Affects Chironomid Larvae Assemblage Composition? A Study in a River Catchment in Northern Patagonia, Argentina. Neotrop Entomol 46, 18–28 (2017). https://doi.org/10.1007/s13744-016-0429-3
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DOI: https://doi.org/10.1007/s13744-016-0429-3