Responses to a warming trend and “El Niño” events in a tropical lake in western Mexico

Caballero, Margarita; Vázquez, Gabriela; Ortega, Beatríz; Favila, Mario E.; Lozano‐García, Socorro

doi:10.1007/s00027-015-0444-1

Cited by 16 publications

(29 citation statements)

References 32 publications

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“…These conditions make these water bodies ideal for ecological and paleoecological studies because their sediments likely retain a detailed record of climate and environmental changes, both natural and anthropogenic. Some of these water bodies have already been affected by climate change (Gomez-Tagle et al, 2002;Caballero et al, 2015), which is worrying, since under these scenarios, we still lack baseline information about the microfauna inhabiting them. Therefore, up-to-date limnological investigation of these water bodies and the species dwelling there are required.…”

Section: Introductionmentioning

confidence: 99%

Ecological drivers of testate amoeba diversity in tropical water bodies of central Mexico

et al. 2018

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Testate amoebae are unicellular organisms characterized by a shell-like test. Due to their potential use as bioindicators (and paleoindicators), these organisms have been increasingly studied in the last decade, particularly in temperate latitudes. This study's objective was two-fold: to identify the testate amoeba communities sampled from 29 water bodies in Mexico and to determine if their presence and distribution also made them suitable bioindicators for tropical latitudes. A total of 40 taxa were recorded within 12 genera, and six significant variables -oxygen, pH, depth, temperature, conductivity, and total alkalinity -that explained testate amoeba distribution within and among the water bodies were identified through a canonical correspondence analysis. The Q-mode clusters rendered five assemblages, each named after their respective dominant species: 1) Centropyxis aculeata strain "aculeata" assemblage, 2) Difflugia oblonga strain "bryophila" assemblage, 3) diverse assemblage, 4) Cucurbitella tricuspis assemblage, and 5) Difflugia protaeiformis strain "acuminata" assemblage. We found that Cucurbitella tricuspis and the Difflugia protaeiformis strain "acuminata" have similar ecological preferences to those reported previously for temperate lakes, with the former identified as an indicator of eutrophic environments and the latter as an indicator of low oxygen levels. On the other hand, Centropyxis aculeata strain "aculeata" and Arcella vulgaris seem to indicate adverse conditions, but the source of this environmental stress apparently differs from that reported in temperate latitudes. Although this stress source could not be identified in all cases, our study nonetheless demonstrates that testate amoebae in the water bodies of central Mexico could reveal the presence of environmental stress.

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Section: Introductionmentioning

confidence: 99%

Ecological drivers of testate amoeba diversity in tropical water bodies of central Mexico

et al. 2018

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“…In the modern climatic system, during El Niño events the ITCZ is displaced southward in the eastern tropical Pacific, which reduces summer precipitation in most of Mexico (Magaña et al, 2003). In the Alberca de Tacámbaro region, ENSO events are related to warmer dryer summers but cooler wetter winters (Magaña et al 2003, Pavia et al 2009, Caballero et al 2016. Caballero et al (2016) showed that the modern warming trend associated with a strong ENSO oscillation from 2009 to 2011 had an important effect on the phytoplankton diversity of this lake, showing that this ecosystem is highly sensitive to climatic variability.…”

Section: Climatic Forcingsmentioning

confidence: 99%

The Holocene record of Alberca de Tacámbaro, a tropical lake in western Mexico: evidence of orbital and millennial‐scale climatic variability

Ortega‐Guerrero

Caballero

Israde-Alcántara

2021

J Quaternary Science

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Laminated sediments in a core from Alberca de Tacámbaro, western central Mexico, provide a high‐resolution record of palaeoclimatic variability for most of the Holocene. Using compositional and textural characteristics we identified 14 facies classified in biogenic, clastic and volcaniclastic groups, in which diatoms and other algal remains are the most common components. In addition to facies analysis, high‐resolution geochemical data from continuous core scanning XRF and the analysis of discrete samples for organic and inorganic carbon content, provide the basis for palaeoclimatic reconstruction. The age model indicates that the record spans from 9.4 cal ka bp toad 1760. Three main phases in the sequence are identified, controlled by millennial‐scale variability. During the period between 9.4 and 5.7 cal kabp, the lake is dominated by siliceous organisms. Drier conditions between 8.2 and 6.3 cal kabp are linked to decreases in summer insolation and solar irradiance. By 5.7 cal kabp, the change in sedimentation is related to the increase in El Niño Southern Oscillation frequency. Evidence of the occurrence of dry conditions during the archaeological Late Classic period (ad 600–900) and historical droughts are also documented in the Alberca de Tacámbaro record. Unprecedented changes in the landscape are recorded afterad 1520.

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“…Las muestras se conservaron en refrigeración hasta ser analizadas en el laboratorio. Para estos análisis se siguieron los métodos analíticos descritos en Caballero et al (2016).…”

Section: Materiales Y Métodosunclassified

“…Las concentraciones de fósforo soluble reactivo (FSR) y de nitrógeno inorgánico disuelto (NID, la suma de amoniaco, nitritos y nitratos) en muestras de agua de distintas profundidades se presentan en la Figura 4; en esta figura se identifican fácilmente las muestras cuyas concentraciones de FSR y NID caen por debajo de 0.1 µM y 7 µM respectivamente, radiocarbono en un laboratorio comercial (Beta-324552: 126.1 ± 0.5 pMC). Esta datación se calibró con el programa CALIBBomb (Hua, Barbetti & Rakowski, 2013;Reimer et al, 2013) y se usó para generar un modelo de edad por interpolación polinomial entre el horizonte fechado y la cima de la secuencia (2006) (Caballero et al, 2016), lo que permite establecer que la sección de la secuencia estudiada data entre 1988 y 2006. Además, se colectaron muestras de sedimento superficial para análisis de diatomeas mediante una draga Ekman en agosto (verano) y octubre (otoño) de 2009, febrero (invierno) de 2010, junio (verano) de 2011, enero, abril, julio y noviembre (invierno, primavera, verano y otoño) de 2015.…”

Section: Materiales Y Métodosunclassified

Lagos como sensores de cambio climático: el caso de La Alberca de Tacámbaro, Michoacán, México

Caballero

Vázquez

2019

TIP RECQB

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Los lagos están entre los ecosistemas más sensibles al cambio climático, ya que el comportamiento termodinámico de su columna de agua es controlado por la marcha anual de la temperatura. Los lagos tropicales profundos presentan una columna de agua estratificada durante los meses más cálidos, sin embargo, en invierno esos estratos desaparecen al mezclarse la columna de agua. El patrón de mezcla de un lago se puede alterar cuando se presenta un incremento en la temperatura, ya sea debido al calentamiento global y/o durante el fenómeno meteorológico conocido como “El Niño”. El objetivo de este trabajo fue correlacionar cambios en el clima con los del lago La Alberca de Tacámbaro, Michoacán, México, durante un período que involucra dos eventos de “El Niño” (2009-2010 y 2015-2016) y con variaciones en las asociaciones de diatomeas preservadas en los sedimentos entre 1988 a 2015. El lago presentó un patrón de mezcla en invierno, con una termoclina somera en primavera que se profundiza en el otoño. Los datos muestran una tendencia que se refleja en la limitación de dos nutrientes, fósforo y nitrógeno (P y N), asociada con una menor mezcla vertical causada por años más calientes desde el 2000 y el efecto de los años en los que se presenta el fenómeno “El Niño”. Estos cambios correlacionan con un calentamiento del hipolimnion en 2015 comparado con 2009 y con alteraciones en la diversidad y composición de las diatomeas entre 1988 a 2015. Este estudio permitió documentar los cambios recientes del lago y asociarlos con el impacto del calentamiento global y los eventos de “El Niño”.

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Responses to a warming trend and “El Niño” events in a tropical lake in western Mexico

Abstract: Lakes are sensitive ecosystems to climatic change but in the tropics it is frequently difficult to evaluate as there are few long-term records. In this paper hydrochemistry and phytoplankton data during the

Cited by 16 publications

References 32 publications

Ecological drivers of testate amoeba diversity in tropical water bodies of central Mexico

Ecological drivers of testate amoeba diversity in tropical water bodies of central Mexico

The Holocene record of Alberca de Tacámbaro, a tropical lake in western Mexico: evidence of orbital and millennial‐scale climatic variability

Lagos como sensores de cambio climático: el caso de La Alberca de Tacámbaro, Michoacán, México

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