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| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Universidad de Costa Rica
2021
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=44967852010 https://www.redalyc.org/journal/449/44967852010/ https://www.redalyc.org/journal/449/44967852010/html/ https://www.redalyc.org/journal/449/44967852010/44967852010.epub https://www.redalyc.org/journal/449/44967852010/movil |
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Sommario:
- Drivers of diversity and altitudinal distribution of chironomids (Diptera: Chironomidae) in the Ecuadorian Andes Christian Villamarín Santiago Villamarín-Cortez Danielle-M. Salcido Mauricio Herrera-Madrid Blanca Ríos-Touma Biología Tropical Andes diversity patterns environmental variables Introduction: Chironomids (Diptera: Chironomidae) are the most globally diverse and widely distributed aquatic insects. Despite their prevalence in lotic systems, little is known about the ecology and diversity of tropical species relative to other aquatic insect taxa, particularly at the immature stages. Objective: Characterize chironomid diversity across an elevational gradient in Southwestern Ecuador and water quality parameters associated with their composition. Methods: Samples were collected using a Surber net in forty rivers within four watersheds in the Ecuadorian Andes comprised of montane and dry lowland forest and spanning an elevational gradient of 3 120 m.a.s.l. Various physic chemical variables were measured including oxygen, conductivity, total dissolved solids, temperature, and pH. Results: Generally, environmental variables were strongly correlated with the composition of chironomid communities. Variation in the chriomid communities was most strongly associated with oxygen, conductivity and pH. The presence of Parametriocnemus, Cricotopus f4, Cricotopus sp3., Cricotopus (Isocladius), Oliveiriella, Onconeura, Alotanypus and Pentaneura was associated with lower temperatures, high dissolved oxygen and low conductivity while assemblages of Cricotopus sp., Rheotanytarsus, Tanytarsus, and Chironomus were associated with high conductivity and low concentrations of dissolved oxygen. The RELATE analysis showed that local environmental characteristics are determine the composition of the chironomid community. Conclusions: Similarity among local environmental factors was strongly correlated to similarity among Chironomidae assemblages, especially with variables such as oxygen concentration, pH and conductivity, whose variables are highly correlated to land use and dominant vegetation in the watersheds sampled. 2021 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44967852010 https://www.redalyc.org/journal/449/44967852010/ https://www.redalyc.org/journal/449/44967852010/html/ https://www.redalyc.org/journal/449/44967852010/44967852010.epub https://www.redalyc.org/journal/449/44967852010/movil 10.15517/rbt.v69i1.40964 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.69