Human practices behind the aquatic and terrestrial ecological decoupling to climate change in the tropical Andes
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Título: | Human practices behind the aquatic and terrestrial ecological decoupling to climate change in the tropical Andes |
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Autor/es: | Benito, Xavier | Benito, Blas M. | Vélez, Maria I. | Salgado, Jorge | Schneider, Tobias | Giosan, Liviu | Nascimento, Majoi N. |
Centro, Departamento o Servicio: | Universidad de Alicante. Instituto Multidisciplinar para el Estudio del Medio "Ramón Margalef" |
Palabras clave: | Diatoms | Pollen | Agropastoralism | Tropical paleolimnology | Rate of change | GAMs | Lagged time series |
Área/s de conocimiento: | Ecología |
Fecha de publicación: | 24-feb-2022 |
Editor: | Elsevier |
Cita bibliográfica: | Science of The Total Environment. 2022, 826: 154115. https://doi.org/10.1016/j.scitotenv.2022.154115 |
Resumen: | Anthropogenic climate change and landscape alteration are two of the most important threats to the terrestrial and aquatic ecosystems of the tropical Americas, thus jeopardizing water and soil resources for millions of people in the Andean nations. Understanding how aquatic ecosystems will respond to anthropogenic stressors and accelerated warming requires shifting from short-term and static to long-term, dynamic characterizations of human-terrestrial-aquatic relationships. Here we use sediment records from Lake Llaviucu, a tropical mountain Andean lake long accessed by Indigenous and post-European societies, and hypothesize that under natural historical conditions (i.e., low human pressure) vegetation and aquatic ecosystems' responses to change are coupled through indirect climate influences—that is, past climate-driven vegetation changes dictated limnological trajectories. We used a multi-proxy paleoecological approach including drivers of terrestrial vegetation change (pollen), soil erosion (Titanium), human activity (agropastoralism indicators), and aquatic responses (diatoms) to estimate assemblage-wide rates of change and model their synchronous and asynchronous (lagged) relationships using Generalized Additive Models. Assemblage-wide rate of change results showed that between ca. 3000 and 400 calibrated years before present (cal years BP) terrestrial vegetation, agropastoralism and diatoms fluctuated along their mean regimes of rate of change without consistent periods of synchronous rapid change. In contrast, positive lagged relationships (i.e., asynchrony) between climate-driven terrestrial pollen changes and diatom responses (i.e., asynchrony) were in operation until ca. 750 cal years BP. Thereafter, positive lagged relationships between agropastoralism and diatom rates of changes dictated the lake trajectory, reflecting the primary control of human practices over the aquatic ecosystem prior European occupation. We interpret that shifts in Indigenous practices (e.g., valley terracing) curtailed nutrient inputs into the lake decoupling the links between climate-driven vegetation changes and the aquatic community. Our results demonstrate how rates of change of anthropogenic and climatic influences can guide dynamic ecological baselines for managing water ecosystem services in the Andes. |
Patrocinador/es: | This work was supported by the National Science Foundation (NSF) - DEB 1260983 and EAR 1338694 and 1624207. XB has received funding from the postdoctoral fellowships programme Beatriu de Pinós, funded by the Secretary of Universities and Research (Government of Catalonia) and by the Horizon 2020 programme of research and innovation of the European Union under the Marie Sklodoska-Curie grant agreement No 801370. |
URI: | http://hdl.handle.net/10045/122038 |
ISSN: | 0048-9697 (Print) | 1879-1026 (Online) |
DOI: | 10.1016/j.scitotenv.2022.154115 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2022 Elsevier B.V. |
Revisión científica: | si |
Versión del editor: | https://doi.org/10.1016/j.scitotenv.2022.154115 |
Aparece en las colecciones: | Personal Investigador sin Adscripción a Grupo Investigaciones financiadas por la UE |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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Benito_etal_2022_SciTotEnv_final.pdf | Versión final (acceso restringido) | 2,21 MB | Adobe PDF | Abrir Solicitar una copia |
Benito_etal_2022_SciTotEnv_revised.pdf | Versión revisada (acceso abierto) | 979,23 kB | Adobe PDF | Abrir Vista previa |
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