info:eu-repo/semantics/article
Response of Chironomidae to environmental disturbances in a high mountain lake in Patagonia during the last millennium
Fecha
2019-09Registro en:
Williams Velázquez, Natalia Noemi; Añón Suárez, Diego Alejandro; Rieradevall, Maria; Rizzo, Andrea Paula; Daga, Romina Betiana; et al.; Response of Chironomidae to environmental disturbances in a high mountain lake in Patagonia during the last millennium; Academic Press Inc Elsevier Science; Quaternary Research; 92; 2; 9-2019; 273-287
0033-5894
CONICET Digital
CONICET
Autor
Williams Velázquez, Natalia Noemi
Añón Suárez, Diego Alejandro
Rieradevall, Maria
Rizzo, Andrea Paula
Daga, Romina Betiana
Arribere, Maria Angelica
Ribeiro Guevara, Sergio
Resumen
Through the last millennium, Patagonia has been affected by changing climate conditions and successive volcanic eruptions. Lake Tonček is a high-altitude lake in the Southern Volcanic Zone in the northern Patagonian Andes. We documented the responses of the subfossil chironomid community to the effects of successive volcanic and different conditions in a sedimentary sequence from this lake comprising the last 900 years. The community composition and structure (abundance, diversity, and richness) and the development of morphological anomalies in the chironomid mouthparts were evaluated throughout the core. Both climatic conditions and volcanism affected the chironomid community differentially. The chironomid community changed following short-term climate change patterns, being affecting not only by temperature changes but also by variations in the regional precipitation regime. Decreases in abundance and diversity were only observed in coarse volcanic layers. In these samples, we recorded a high percentage of damaged chironomid mouthparts caused by mechanical wear, breakage or abrasion, possibly due to the increase of mineral particles. Our results represent important baseline data about the responses of chironomid communities to environmental disturbances in high-altitude lakes over long time frames.