气候变化领域集成服务门户(CCPortal): Diatom-inferred ecological responses of an oceanic lake system to volcanism and anthropogenic perturbations since 1290 CE

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DOI	10.1016/j.palaeo.2019.109285
	Diatom-inferred ecological responses of an oceanic lake system to volcanism and anthropogenic perturbations since 1290 CE
	Vázquez-Loureiro D.; Gonçalves V.; Sáez A.; Hernández A.; Raposeiro P.M.; Giralt S.; Rubio-Inglés M.J.; Rull V.; Bao R.
发表日期	2019
ISSN	0031-0182
卷号	534
英文摘要	The impacts of natural- and human-induced processes on lake ecosystems in remote oceanic islands remain to be fully elucidated. These lakes are excellent candidates to analyze the importance of anthropogenic vs. natural forces driving lacustrine long-term ecological evolution from previous pristine pre-colonized conditions. Disentangling the effects of both is particularly relevant in highly active volcanic areas, where catastrophic eruptions can act as an atypical natural driver altering the lake's long-term ecological trajectories. In this paper we study past ecological changes occurring in Lake Azul (São Miguel island), a crater lake from the remote Azorean archipelago, to address which were the main causes of its long-term trophic history. We analyzed diatom assemblages, sedimentology, and bulk organic matter of sediments deposited since ca. 1290 CE, when a huge local eruption occurred. This episode drove the evolution of Lake Azul through six distinct phases, commencing with a restart of ecological succession after tephra deposition disrupted biogeochemical cycling. The alteration was so profound that the lake underwent a state of oligotrophic conditions for approx. 650 yr. Nutrients were sourced by fish-induced internal recycling and the overflow of the near Lake Verde during this period, rather than by allochthonous nutrient inputs modulated by climate variability and/or vegetation cover changes in the watershed after the official Portuguese colonization. It was only after recent artificial fertilization when the system overcame the volcanic-induced long-term resilience. This over-fertilization and a reduction in water turnover exacerbated the recent symptoms of eutrophication after 1990 CE. Contrary to other studies, Lake Azul constitutes an uncommon case of long-term resilience to trophic change induced by a cataclysmic volcanic eruption. It brings new insights into the fate of lake ecosystems which might be affected by similar events in the future. © 2019 Elsevier B.V.
英文关键词	Eutrophication; Invasive species; Lake ontogeny; Oligotrophication; Regime shifts; Volcanic eruptions
语种	英语
scopus关键词	anthropogenic effect; archipelago; biogeochemical cycle; colonization; diatom; ecosystem response; environmental conditions; eutrophication; invasive species; lake ecosystem; oligotrophic environment; vegetation cover; volcanic eruption; volcanism; Azores; Portugal; Sao Miguel; Bacillariophyta
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150779
作者单位	Centro de Investigacións Científicas Avanzadas (CICA), Facultade de Ciencias, Universidade da Coruña, A Coruña, Spain; Centro de Investigação em Biodiversidade e Recursos Genéticos, CIBIO, InBIO Laboratório Associado, Pólo dos Açores & Faculdade de Ciências e Tecnologia da Universidade dos Açores, Ponta Delgada, Açores, Portugal; Department of Earth and Ocean Dynamics, Universitat de Barcelona, Barcelona, Spain; Institute of Earth Sciences Jaume Almera (ICTJA-CSIC), Barcelona, Spain
推荐引用方式 GB/T 7714	Vázquez-Loureiro D.,Gonçalves V.,Sáez A.,等. Diatom-inferred ecological responses of an oceanic lake system to volcanism and anthropogenic perturbations since 1290 CE[J],2019,534.
APA	Vázquez-Loureiro D..,Gonçalves V..,Sáez A..,Hernández A..,Raposeiro P.M..,...&Bao R..(2019).Diatom-inferred ecological responses of an oceanic lake system to volcanism and anthropogenic perturbations since 1290 CE.Palaeogeography, Palaeoclimatology, Palaeoecology,534.
MLA	Vázquez-Loureiro D.,et al."Diatom-inferred ecological responses of an oceanic lake system to volcanism and anthropogenic perturbations since 1290 CE".Palaeogeography, Palaeoclimatology, Palaeoecology 534(2019).