Lipid biomarkers in the Enol Lake (Asturias, Northern Spain): coupled natural and human induced environmental history

Ortiz Menéndez, José Eugenio and Sánchez- Palencia, Yolanda and Torres Pérez-Hidalgo, Trinidad José and Domingo, Laura and Mata, Pilar and Vegas, Juana and Sánchez-España, Javier and Morellón, Mario and Blanco, Lorena (2016). Lipid biomarkers in the Enol Lake (Asturias, Northern Spain): coupled natural and human induced environmental history. "Organic geochemistry", v. 92 ; pp. 70-93. ISSN 0146-6380. https://doi.org/10.1016/j.orggeochem.2015.12.005.

Description

Title: Lipid biomarkers in the Enol Lake (Asturias, Northern Spain): coupled natural and human induced environmental history
Author/s:
  • Ortiz Menéndez, José Eugenio
  • Sánchez- Palencia, Yolanda
  • Torres Pérez-Hidalgo, Trinidad José
  • Domingo, Laura
  • Mata, Pilar
  • Vegas, Juana
  • Sánchez-España, Javier
  • Morellón, Mario
  • Blanco, Lorena
Item Type: Article
Título de Revista/Publicación: Organic geochemistry
Date: February 2016
ISSN: 0146-6380
Volume: 92
Subjects:
Faculty: E.T.S.I. de Minas y Energía (UPM)
Department: Ingeniería Geológica y Minera
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The lipid content of three cores from Lake Enol (Picos de Europa National Park, Asturias, Northern Spain) was studied. The n-alkane profiles indicated a major input from terrigenous plants [predominance of high molecular weight (HMW) alkanes] since ca. 1695 AD to the water body, although the uppermost cm revealed a predominance of organic matter (OM) derived from algae, as the most abundant alkane was C17. Three units revealing different environmental conditions were defined. Unit A (ca. 1695–1860 AD) in the lowermost parts of ENO13-10 (< 12 cm) and ENO13-15 (< 28 cm) was identified and was characterized by higher OM input and evidence of minimal degradation (high CPI values, predominance of HMW n-alkanoic acids and good correspondence between the predominant n-alkane and n-alkanoic acid chains). These findings could be linked to the Little Ice Age, when cold and humid conditions may have favored an increase in total organic carbon (TOC) and n-alkane and n-alkanoic acid content (greater terrigenous OM in-wash), and may have also reduced bacterial activity. In Unit B (ca. 1860–1980 AD) the lack of correspondence between the n-alkane and n-alkanoic acid profiles of ENO13-10 (12–4 cm) and ENO13-15 (28–8 cm) suggested a certain preferential microbial synthesis of long chain saturated fatty acids from primary OM and/or bacterial activity, coinciding with a decrease in OM input, which could be linked to the global warming that started in the second half of the 19th century. In ENO13-7 the low OM input (low TOC) was accompanied by some bacterial degradation (predominance ofHMWn-alkanoic acids but with a bimodal distribution) in the lowermost 16–5 cm. Evidence of considerable phytoplankton productivity and microbial activity was especially significant in Unit C (ca. 1980–2013 AD) identified in the uppermost part of all three cores (5 cm in ENO13-7, 4 cm in ENO13-10 and 8 cm in ENO13-15), coinciding with higher concentrations of n-alkanes and n-alkanoic acids, which were considered to be linked to warmer and drier conditions, as well as to greater anthropogenic influence in modern times. Plant sterols, such as b-sitosterol, campesterol and stigmasterol, were significantly present in the cores. In addition, fecal stanols, such as 24-ethylcoprostanol from herbivores, were present, thereby indicating a continuous and significant pollution input derived from these animals since the 17th century, being more important in the last 20 years.

More information

Item ID: 40211
DC Identifier: http://oa.upm.es/40211/
OAI Identifier: oai:oa.upm.es:40211
DOI: 10.1016/j.orggeochem.2015.12.005
Official URL: https://doi.org/10.1016/j.orggeochem.2015.12.005
Deposited by: Memoria Investigacion
Deposited on: 22 Jun 2016 10:43
Last Modified: 13 Mar 2019 17:19
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