Arid
DOI10.1016/j.quascirev.2015.09.019
Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake
Bao, R.1; Hernandez, A.2; Saez, A.3; Giralt, S.4; Prego, R.5; Pueyo, J. J.3; Moreno, A.6; Valero-Garces, B. L.6
通讯作者Bao, R.
来源期刊QUATERNARY SCIENCE REVIEWS
ISSN0277-3791
出版年2015
卷号129页码:96-110
英文摘要

The coupling of lake dynamics with catchment biogeochemistry is considered the key element controlling primary production in mountain lakes at time scales of a few decades to millennia, yet little is known on the impacts of the morphometry of lakes throughout their ontogeny. As Lake Chungara (Central Andean Altiplano, northern Chile) experienced long-term lake-level fluctuations that strongly modified its area:volume ratio, it is an ideal system for exploring the relative roles that long-term climatic shifts and lake morphometry play on biosiliceous lacustrine productivity. In this paper, we review previous data on the percent contents of total organic carbon, total inorganic carbon, total nitrogen, total biogenic silica, isotopic composition of organic matter, carbonates, and diatom frustules, as well as data on the abundance of the chlorophycean Botryococcus braunii in this lake for the period 12,400 -1300 cal yr BP. We also include new data on organic carbon and biogenic silica mass accumulation rates and the diatom assemblage composition of an offshore core dated using C-14 and U/Th.


Biosiliceous productivity in Lake Chungara was influenced by shifts in allochthonous nutrient inputs related to variability in precipitation. Humid phases dated at approx. 12,400 to 10,000 and 9600 to 7400 cal yr BP coincide with periods of elevated productivity, whereas decreases in productivity were recorded during arid phases dated at approx. 10,000 to 9600 and 7400 to 3550 cal yr BP (Andean mid-Holocene Aridity Period). However, morphometry-related in lake controls led to a lack of a linear response of productivity to precipitation variability. During the late Glacial to early Holocene, lowstands facilitated complete water column mixing, prompting episodic massive blooms of a large centric diatom, Cyclostephanos cf. andinus. Thus, moderate productivity could be maintained, regardless of aridity, by this phenomenon of morphometric eutrophy during the early history of the lake. The subsequent net increase in lake level introduced modifications in the area of the epilimnion sediments versus the total volume of the epilimnion, preventing complete overturn. Surpassing a certain depth threshold at approx. 8300 cal yr BP caused cessation of the morphometric eutrophy conditions associated with Cyclostephanos cf. andinus superblooms. After 7300 cal yr BP, the lake experienced a decrease in biosiliceous productivity and a change of state that involved a stronger dependence on precipitation variability, with a lesser contribution of diatoms to the total primary productivity. Our results show that the interpretation of lacustrine paleoproductivity records as paleoclimatic archives needs to take into account the effects of changes in the epilimnion sediment area to epilimnion volume ratio in association with lake ontogeny. (C) 2015 Elsevier Ltd. All rights reserved.


英文关键词Lake paleoproductivity Lake ontogeny Laminated sediments Diatoms Andean Altiplano Holocene
类型Article
语种英语
国家Spain ; Portugal
收录类别SCI-E
WOS记录号WOS:000366232300006
WOS关键词PRIMARY PRODUCTIVITY ; NORTHERN CHILE ; CHUNGARA ; ALTIPLANO ; EVOLUTION ; TITICACA ; AMERICAN ; HISTORY ; RECORD ; PHYTOPLANKTON
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/190095
作者单位1.Univ A Coruna, Fac Ciencias, CICA, La Coruna 15071, Spain;
2.Univ Lisbon, Fac Ciencias, IDL, P-1749016 Lisbon, Portugal;
3.Univ Barcelona, Fac Geol, E-08028 Barcelona, Spain;
4.Inst Earth Sci Jaume Almera CSIC, Barcelona 08028, Spain;
5.Inst Invest Marinas CSIC, Vigo 36208, Spain;
6.Pyrenean Inst Ecol CSIC, Zaragoza 50059, Spain
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GB/T 7714
Bao, R.,Hernandez, A.,Saez, A.,et al. Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake[J],2015,129:96-110.
APA Bao, R..,Hernandez, A..,Saez, A..,Giralt, S..,Prego, R..,...&Valero-Garces, B. L..(2015).Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake.QUATERNARY SCIENCE REVIEWS,129,96-110.
MLA Bao, R.,et al."Climatic and lacustrine morphometric controls of diatom paleoproductivity in a tropical Andean lake".QUATERNARY SCIENCE REVIEWS 129(2015):96-110.
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