Diversity analysis of Chironomidae from the Andean-Amazonian transition (Caquetá, Colombia): a regional perspective
DOI:
https://doi.org/10.15517/y4kf5z72Keywords:
beta diversity; , riverscape;, non-biting midges; , Hill numbersAbstract
Introduction: The family Chironomidae is one of the most diverse and abundant groups of aquatic macroinvertebrates in aquatic ecosystems. Objective: To analyze Chironomidae's composition and diversity in the Caquetá department's Andean-Amazonian corridor, Colombia. Methods: Three study zones (Andean, Transition, and Amazonian), each with ten sampling stations, were selected. We conducted four field campaigns to collect biological material and record riverscape characteristics. We assessed alpha diversity using Hill numbers, a set of diversity measures providing a unified framework for diversity analysis. We also analyzed beta diversity by considering species richness differences and turnover. Using multivariate RDA analysis, physical and chemical variables of the riverscape contrast with taxonomic composition and beta diversity. Results: 36 chironomid taxa were identified, with the subfamily Chironominae and the genera Cricotopus, Chironomus, Larsia, and Polypedilum standing out. Hill numbers showed differentiation in Shannon-Wiener diversity (q1) and inverse Simpson diversity (q2), but richness (q0) showed less variation across study zones. The most significant component of beta diversity was species richness differences. Current velocity, total dissolved solids (TDS), vegetation cover, and substrates of sandy and vegetative origin (roots, aquatic macrophytes), as well as other components of the riverscape, significantly influenced species composition and beta diversity. Conclusions: Significant genus level information is provided for the Chironomidae family in the Andean-Amazonian region of the department of Caquetá, revealing dissimilarity among the study areas driven by differences in richness, as a measure of taxonomic beta diversity. Moreover, these findings indicate that the transition region functions as an ecotone for Chironomidae, serving as an intermediate zone between the Andes and the Amazon.
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