Climatic variability in the northern sector of the American tropics since the latest MIS 3

Lozano‐García, Socorro; Ortega, Beatríz; Roy, Priyadarsi D.; Beramendi‐Orosco, Laura; Caballero, Margarita

doi:10.1016/j.yqres.2015.07.002

Cited by 47 publications

(49 citation statements)

References 43 publications

(58 reference statements)

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“…Lozano-Garc ıa et al 2007;Caballero et al 2010;Correa-Metrio et al 2013), and moisture availability has been largely controlled by the millennial-scale migration of the Intertropical Convergence Zone (e.g. Correa-Metrio et al 2012b;Lozano-Garc ıa et al 2015;Torres-Rodr ıguez et al 2015). Thus, the late Quaternary could be summarized through three main environmental settings ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Vegetation assemblages of central Mexico through the late Quaternary: modern analogs and compositional turnover

Caballero‐Rodríguez

Lozano‐García

Correa‐Metrio

2017

J Vegetation Science

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Question When did vegetation assemblages that occupy modern central Mexico appear within the context of the late Quaternary? Location Central Mexico. Methods We used modern and fossil pollen data sets from central Mexico to explore the evolution of regional vegetation through the late Quaternary. A total of 1397 samples (1357 fossil samples distributed in 17 records and 40 modern samples) were analysed through detrended correspondence analysis to evaluate the degree of analogy between modern and past vegetation assemblages, and regional vegetation compositional turnover through time. Results There was a high degree of analogy between modern and glacial vegetation, whereas the early and mid‐Holocene were characterized by a high frequency of no‐modern‐analogue pollen assemblages. Vegetation turnover during the glacial time was characterized by both pulses of abrupt change and episodes of stability. In contrast, vegetation turnover was high through most of the Holocene. Both vegetation turnover and past vegetation analogy to modern were not synchronous in altitudinal zones, except for the past 2000 yrs, when pollen assemblages suggest a high vegetation analogy to modern‐day throughout the region. Conclusions Human impacts on central Mexico regional vegetation were consistently evident during the last 2000 yrs, suggesting that biodiversity expressed in the modern vegetation assemblages incorporates a high anthropogenic imprint. High resemblance of glacial and modern landscapes suggests that the effect of human occupation on the landscape is similar to that exerted by glacial time environmental stress. However, loss of ecosystem connectivity under the modern pattern of landscape homogenization represents an unprecedented threat for regional biodiversity.

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Section: Introductionmentioning

confidence: 99%

Vegetation assemblages of central Mexico through the late Quaternary: modern analogs and compositional turnover

Caballero‐Rodríguez

Lozano‐García

Correa‐Metrio

2017

J Vegetation Science

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“…Varios estudios paleoecológicos se han realizado en distintas secuencias lacustres perforadas en el lago de Chalco con el propósito de reconstruir la historia climática y ambiental del Pleistoceno tardío y Holoceno (Caballero y Ortega-Guerrero, 1998;Caballero et al, 2010;Lozano-García et al, 2015;Torres-Rodríguez et al, 2015, Avendaño-Villeda et al, 2018. Diversos eventos volcánicos han sido reconocidos en los depósitos lacustres de Chalco (Caballero y Ortega-Guerrero,…”

Section: Fisiografía Y Actividad Volcánicaunclassified

Fires and volcanic activity: History of fire in the Mexico basin during late Pleistocene based on carbonized material records in the Chalco lake

et al. 2019

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Forest fires, considered as free and not programmed fire propagation, are perturbations that greatly alter ecosystems. During fires, variable quantities of charcoal particles are produced by the burning vegetation, which can be later deposited in lacustrine basins. The traditional charcoal size particle model associates the > 100 µm primary particles to local fire events, within the watershed, and the < 100 µm particles are linked to regional fire events, outside the watershed. Fires can be related with favorable climatic conditions, but in tectonically active areas like the basin of Mexico, volcanism can also be a factor producing fires and charcoal particles. We document the history, intensity and frequency of fires recorded in the lacustrine sediments of lake Chalco (core CHAVII-11), by performing a high-resolution charcoal particle analysis in sediments deposited before and after three main volcanic events. The sources of these events had different distances to lake Chalco: Tláhuac tephra (TTH; 28690 years cal BP), probably produced by the Teuhtli volcano, was a local event; the Tutti Frutti Pumice (PTF; 17000 years cal BP) produced by the Popocatépetl volcano, was an extra-local event and the Upper Toluca Pumice (PTS; 12300 years cal BP) produced by the Nevado de Toluca volcano, was a regional event. Charcoal accumulation rates (CHAR) and distribution of size particles indicate that paleoclimate was a direct factor defining the intensity and recurrence of fires before and after volcanic activity, as climate defines vegetation type and density, and therefore fuel availability. Fires before and after the TTH were frequent, local and intense in comparison with fires reconstructed before or after the PTF and PTS events. CHAR values were lower during the more widespread PTF event, than for the local TTH event, although the highest CHAR values were recorded for the most distant, regional, and intense PTS event. These results show that charcoal accumulation rates during the volcanic events in central Mexico cannot be interpreted following traditional model of charcoal particle dispersion. This model have important restrictions in active volcanic regions such as central Mexico.

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“…B) Mapa de la cuenca de México y la zona del lago de Chalco señalada por el recuadro negro. C) Zona del lago de Chalco donde se muestran con triángulos los estudios previos realizados en Chalco (Lozano-García et al, 1993;Caballero y Ortega-Guerrero, 1998;Herrera-Hernández, 2011;Lozano-García et al, 2015. D) Se muestran el sitio de perforación del proyecto Mexidrill con una estrella negra y las perforaciones anteriores con triángulos rojos, el triángulo amarillo indica el área donde se realizó el levantamiento geofísico por sondeo electromagnéticos (Bücker et al, 2017).…”

Section: Estudios Inicialesunclassified

Perforación profunda en el lago de Chalco: reporte técnico

Lozano‐García¹,

Brown²,

Ortega³

et al. 2017

BSGM

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Climatic variability in the northern sector of the American tropics since the latest MIS 3

Cited by 47 publications

References 43 publications

Vegetation assemblages of central Mexico through the late Quaternary: modern analogs and compositional turnover

Vegetation assemblages of central Mexico through the late Quaternary: modern analogs and compositional turnover

Fires and volcanic activity: History of fire in the Mexico basin during late Pleistocene based on carbonized material records in the Chalco lake

Perforación profunda en el lago de Chalco: reporte técnico

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