Present Limnological Conditions and Recent (ca. 340 yr) Palaeolimnology of a Tropical Lake in the Sierra de Los Tuxtlas, Eastern Mexico

Caballero, Margarita; Vázquez, Gabriela; Lozano‐García, Socorro; Aguilar, Rodríguez; Sosa-Nájera, Susana; Ruiz-Fernández, Ana Carolina; Ortega, Beatríz

doi:10.1007/s10933-005-7427-5

Cited by 42 publications

(37 citation statements)

References 19 publications

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“…1) (18), which also indicates the lack of significant human presence in the region during the LIA that could obscure the effects of climatic variability. Two tephra layers within the LIA age interval indicate volcanic impacts; the older one dates to the late 15th century (Ϸ1450), and the younger one represents the 1664 eruption of the nearby San Martín volcano (12), which is coincident with low PARs of all taxa (Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

“…The chronology of the 6-m sediment sequence is based on five accelerator mass spectrometer radiocarbon dates determined on pollen extract to avoid the ''old carbon'' effect (13) and by correlation with a parallel core dated by 210 Pb and 137 Cs (12,29). Charcoal, pollen, and diatom samples were collected on average every 8 cm, which gives a temporal resolution of 30-80 years.…”

Section: Methodsmentioning

confidence: 99%

“…Lago Verde, near the coast of the Gulf of Mexico ( Fig. 1), is a highly sensitive record of recent climate change (12,13) where the response of the tropical vegetation and the lake system to the LIA cooling can be clearly traced, without any significant human impact. Multiproxy data from this lake show that in this tropical region the LIA is recorded by the deepest lake level and the densest forest cover of the last two millennia.…”

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confidence: 99%

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Tracing the effects of the Little Ice Age in the tropical lowlands of eastern Mesoamerica

Lozano‐García¹,

Caballero

Ortega

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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The causes of late-Holocene centennial to millennial scale climatic variability and the impact that such variability had on tropical ecosystems are still poorly understood. Here, we present a highresolution, multiproxy record from lowland eastern Mesoamerica, studied to reconstruct climate and vegetation history during the last 2,000 years, in particular to evaluate the response of tropical vegetation to the cooling event of the Little Ice Age (LIA). Our data provide evidence that the densest tropical forest cover and the deepest lake of the last two millennia were coeval with the LIA, with two deep lake phases that follow the Spö rer and Maunder minima in solar activity. The high tropical pollen accumulation rates limit LIA's winter cooling to a maximum of 2°C. Tropical vegetation expansion during the LIA is best explained by a reduction in the extent of the dry season as a consequence of increased meridional flow leading to higher winter precipitation. These results highlight the importance of seasonal responses to climatic variability, a factor that could be of relevance when evaluating the impact of recent climate change.climate variability ͉ Late Holocene ͉ Mexico ͉ seasonality ͉ tropical ecosystems T he Little Ice Age (LIA) (1350-1850 A.D.) has been identified as one of the most important climatic oscillations of the late Holocene and the last of several centennial to millennial scale Holocene cooling events centered over the North Atlantic (1-4). Low-latitude cooling during the LIA is evident from tropical glacier advances (5, 6), and reduced sea-surface temperatures in the Caribbean (7-9). Dry LIA conditions in the Caribbean are relatively well documented and explained by a change in the position of the Intertropical Convergence Zone (ITCZ) (10, 11), but little is known about the impact that this climatic event had on the lowland tropical ecosystems of the Americas. Lago Verde, near the coast of the Gulf of Mexico (Fig. 1), is a highly sensitive record of recent climate change (12,13) where the response of the tropical vegetation and the lake system to the LIA cooling can be clearly traced, without any significant human impact. Multiproxy data from this lake show that in this tropical region the LIA is recorded by the deepest lake level and the densest forest cover of the last two millennia. In this article, we present arguments evaluating the role of solar forcing as an important element explaining climatic variability in the tropics and the North Atlantic region. We also discuss the role of regional moisture balance as a condition for the expression of regional precipitation trends, and, finally, we present an argument about the importance that changes in the seasonality of precipitation can have over the Gulf of Mexico coastal region, mitigating the dry LIA trend recorded in some areas of the Caribbean. Study SiteThis study is based mainly on pollen, charcoal particles, and diatom analyses on the sediment record from Lago Verde, a small, closed-basin lake at 200 m above sea level, on the outskirts of ...

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Tracing the effects of the Little Ice Age in the tropical lowlands of eastern Mesoamerica

Lozano‐García¹,

Caballero

Ortega

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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“…Celtis, Lonchocarpus, Moraceae) attaining positive scores (Figure 1). In terms of diatoms, the ecological space seems to be clearly divided too, providing further evidence of the utility of DCA for interpreting ecological and environmental signals from lacustrine sedimentary sequences (see Caballero et al, 2006, for species environmental associations). According to species distribution, diatom-DCA axis 1 reflected water column depth (Figure 1).…”

Section: Lago Verde Detrended Corresponde Analysis: Pollen and Diatomsmentioning

confidence: 90%

“…Urrego et al, 2009;Correa-Metrio et al, 2012b;Restrepo et al, 2012;). Because of this essential reason, our paper focuses on the description of some technicalities of the method, along with the development of a worked example using pollen and diatoms from Lago Verde (see Caballero et al, 2006;Ortega et al, 2006;Lozano-Garcia et al, 2007).…”

Section: Multivariate Analyses Of Fossil Data Setsmentioning

confidence: 99%

Detrended correspondence analysis: A useful tool to quantify ecological changes from fossil data sets

Correa‐Metrio

Dechnik

Lozano‐García

et al. 2014

BSGM

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Fossil assemblages reflect the parental communities that produced them, and are in turn associated with specific environmental conditions. Thus, climatic and environmental changes are associated with changes in both the biotic communities and the fossil assemblages they produce. As a consequence, the environmental reconstruction of the past relies on the interpretation of multivariate fossil sequences that are commonly analyzed through dimensional rescaling techniques. Detrended correspondence analysis (DCA) has proven as an excellent technique to summarize ecological changes through time with the advantage of few prior assumptions and results that can be directly interpreted in terms of ecological turnover. In this paper we elaborate on a brief description of the technique and the interpretation of results, using a worked example on pollen and diatom data sets from Lago Verde (Los Tuxtlas, Mexico). With this worked example, we highlight the three basic ways in which DCA can provide useful approaches for a clear and relatively easy interpretation of the fossil data: i) identification of the ecological space through the a priori interpretation of species ordination; ii) localization of time slices within the ecological space defined by species, and quantification of the ecological turnover among samples; and iii) calculation of ecological distances as a means for putting individual samples into the historical context provided by the time frame in question.Keywords: Ecological distance, ecological turnover, ecological baseline, pollen, diatoms, detrended correspondence analysis (DCA). Resumen Los arreglos de fósiles coetáneos reflejan las comunidades parentales que los produjeron, las cuales están asociadas a su vez con condiciones ambientales particulares. Por lo tanto, los cambios climáticos y ambientales están inherentemente asociados con cambios en las comunidades bióticas y en los arreglos fósiles

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Planktonic microbial communities from microbialite‐bearing lakes sampled along a salinity‐alkalinity gradient

Iniesto

Moreira

Benzerara³

et al. 2022

Limnology & Oceanography

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Continental freshwater systems are particularly vulnerable to environmental variation. Climate changeinduced desertification and the anthropogenic exploitation of hydric resources result in the progressive evaporation and salinization of inland water bodies in many areas of the globe. However, how this process impacts microbial communities and their activities in biogeochemical cycles is poorly known. Here, we take a space-fortime substitution approach and characterize the prokaryotic and eukaryotic microbial communities of two planktonic cell-size fractions (0.2-5 μm and 5-30 μm) from lakes of diverse trophic levels sampled along a salinity-alkalinity gradient located in the Trans-Mexican Volcanic Belt (TMVB). We applied a 16S/18S rRNA gene metabarcoding strategy to determine the microbial community composition of 54 samples from 12 different lakes, from the low-salinity lake Zirahuén to the hypersaline residual ponds of Rinc on de Parangueo. Except for systems at both extremes of the salinity gradient, most lakes along the evaporation trend bear actively forming microbialites, which harbor microbial communities clearly distinct from those of plankton. Several lakes were sampled in winter and late spring and the crater lakes Alchichica and Atexcac were sampled across the water column. Physicochemical parameters related to salinity-alkalinity were the most influential drivers of microbial community structure whereas trophic status, depth, or season were less important. Our results suggest that climate change and anthropogenic-induced hydric deficit could significantly affect microbial communities, potentially altering ecosystem functioning.

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Present Limnological Conditions and Recent (ca. 340 yr) Palaeolimnology of a Tropical Lake in the Sierra de Los Tuxtlas, Eastern Mexico

Cited by 42 publications

References 19 publications

Tracing the effects of the Little Ice Age in the tropical lowlands of eastern Mesoamerica

Tracing the effects of the Little Ice Age in the tropical lowlands of eastern Mesoamerica

Detrended correspondence analysis: A useful tool to quantify ecological changes from fossil data sets

Planktonic microbial communities from microbialite‐bearing lakes sampled along a salinity‐alkalinity gradient

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