A5026319255- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Environmental DNA in Biodiversity Studies
- Microbial Community Ecology and Physiology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Geological formations and processes
- Subterranean biodiversity and taxonomy
- Cryospheric studies and observations
- Marine Biology and Ecology Research
- Species Distribution and Climate Change
- Protist diversity and phylogeny
- Evolution and Paleontology Studies
- Animal Genetics and Reproduction
- Geomagnetism and Paleomagnetism Studies
- Climate change and permafrost
- Archaeology and ancient environmental studies
- Diatoms and Algae Research
- Spanish Literature and Culture Studies
- Injury Epidemiology and Prevention
- Genomics and Phylogenetic Studies
- Paleontology and Stratigraphy of Fossils
- Aquatic Invertebrate Ecology and Behavior
- Pleistocene-Era Hominins and Archaeology
- Sex and Gender in Healthcare
- Freshwater macroinvertebrate diversity and ecology
Technische Universität Braunschweig
2019-2024
Universidad Nacional Autónoma de México
2017
Universidad Nacional del Sur
2012
Abstract. The Tibetan Plateau (TP) is the largest alpine plateau on Earth and plays an important role in global climate dynamics. On TP, change happening particularly fast, with increase air temperature twice average. particular sensitivity of this high mountain environment allows observation tracking abiotic biotic feedback mechanisms. Closed lake systems, such as Nam Co central represent natural laboratories for past recent climatic changes, well geobiological processes interactions within...
Diatoms (Bacillariophyceae) are characterized by silicified cell walls that favor their long-term preservation in sediments, therefore widely used as bioindicators of present and past water conditions. Alongside with traditional morphological analyses, metabarcoding has become a valuable tool to study the community structures various organisms, including diatoms. Here, we test whether quantity sediment sample for DNA extraction affects results obtained from high-throughput sequencing...
ABSTRACT The last 85,000 years were characterized by high climate and environmental variability on the Yucatán Peninsula. Heinrich stadials are examples of abrupt transitions that involved shifts in regional temperatures moisture availability. Thus, they serve as natural experiments to evaluate contrasting responses aquatic terrestrial ecosystems. We used ostracodes pollen preserved a 75.9-m-long sediment core (PI-6, ~85 ka) recovered from Lake Petén Itzá, Guatemala, assess magnitude...
This paleolimnological study used ostracodes assemblages, element concentrations, organic and inorganic carbon content, C:N ratios, stable isotope values in valves of the Cytheridella ilosvayi as paleoindicators is first such investigation from a mid-elevation site southern México. We provide ~7600-year (9540–1970 BP) environmental history karst Lake Ocotalito (920 m a.s.l.), which lies Lacandon Forest Chiapas, A 5.4-m sediment core was retrieved water depth 23 m. The main factor that shaped...
Ostracodes are bivalve microcrustaceans with calcium carbonate shells that preserve well in lake sediment. They very sensitive to environmental variables and therefore powerful tools paleoclimate paleoenvironmental studies cover time periods from decades millions of years. Detailed knowledge species ecological preferences robust taxonomy prerequisites for such studies. Such information, however, is still lacking many areas the world, including Neotropics. Previous northern Neotropics were...
Abstract We analyzed sediment cores from coastal Lake Izabal, Guatemala, to infer Holocene biogeochemical changes in the lake. At ca. 8370 calibrated yr B.P. (cal. B.P.), marine waters entered lake, which presently lies ~38 km Caribbean coast. Temporal correlation between Early drainage of high-latitude Lakes Agassiz and Ojibway (in North America) flooding Izabal suggests a causal link two processes. Our data indicate relative sea-level jump 2.60 ± 0.88 m, is larger than previous estimates...
Lake sediments represent valuable and widely used archives for tracking environmental biotic changes over time. Past aquatic communities are traditionally studied via morphological identification of the remains organisms. However, molecular tools, such as DNA metabarcoding, have revolutionized field biomonitoring by enabling high-throughput fast organisms from samples (e.g., soil). Sedimentary ancient (sedaDNA) an approach to track biodiversity target sediment cores, spanning thousands...
The ecology of aquatic protists such as testate amoebae is poorly known worldwide, but almost completely unknown in lakes the northern Neotropics. To address this knowledge gap, we analyzed (Amoebozoa: Arcellinidae) Lacandón Forest, one most biodiverse parts southern México. We set out to evaluate diversity communities and assess whether taxa are reliable indicators environmental variables dissolved oxygen water depth. collected 17 surface sediment samples from a range depths six across...
Taxonomic clarification of Tonnacypris stewarti comb. nov. (= Herpetocypris stewarti), a non-marine ostracod first described by Daday in 1908, was required due to the existence various synonyms without detailed morphological descriptions. Our study examined specimens from Mang-tsa, Nam Co (Tibetan Plateau) and Lake Band-e Amir (Afghanistan). We identified seven definitive (Herpetocypris Ilyodromus estonicus Järvekülg 1960, Eucypris afghanistanensis Hartmann 1964, E. gyirongensis Yang 1982,...
Abstract. We evaluated how ranges of four endemic and non-endemic aquatic ostracode species changed in response to long-term (glacial–interglacial cycles) abrupt climate fluctuations during the last 155 kyr northern Neotropical region. employed two complementary approaches, fossil records distribution models (SDMs). Fossil assemblages were obtained from sediment cores PI-1, PI-2, PI-6 Petén-Itzá 22-VIII-99 Petén Itzá Scientific Drilling Project, Lake Itzá, Guatemala. To obtain a spatially...
ABSTRACT The recent rise in air temperatures detected at high altitudes of the Tibetan Plateau has accelerated glacier melt and retreat. Moreover, enhanced monsoonal precipitation increased runoff transport allochthonous material to lakes. Consequently, water levels are rising, modifying spatial distribution composition local aquatic biota. To infer these environmental biological changes decades, a 30‐cm‐long sediment core, representing past ~160 years, from Nam Co, an endorheic lake, was...
Abstract Dwelling in a variety of aquatic habitats, one the most abundant groups microcrustaceans, ostracodes, are widely used indicator organisms paleolimnological research. Typically, they identified via traditional methods using morphological features but this may be excessively time‐consuming and prone to inter‐investigator variation. DNA barcoding metabarcoding have become important tools for specimen identification, with great impact field taxonomy, (paleo‐)ecology evolution. Despite...
Abstract. The Tibetan Plateau (TP) is the largest alpine plateau on Earth and plays an important role in global climate dynamics. On TP, change happening particularly fast, with increase air temperature twice average. particular sensitivity of this high mountainous environment allows observation tracking abiotic biotic feedback mechanisms. Closed lake systems, such as Nam Co central TP represent natural laboratories for past recent climatic oscillations, well geobiological processes...
Understanding climate and monsoonal dynamics on the Tibetan Plateau is crucial, as recent hydrological changes, evidenced by rising lake levels, will be accelerated current global warming may alter aquatic habitats species inventories. This study combines chironomid assemblages with sedimentological, mineralogical geochemical data of a short sediment core (37.5 cm) from high-altitude (> 4,733 m asl), saline (9 g L-1) shallow (~5 water depth) Shen Co, located in southern part central...
We contribute transcriptomic data for two species of Ostracoda, an early-diverged group small-sized pancrustaceans. Data include new reference transcriptomes asexual non-marine (Dolerocypris sinensis and Heterocypris aff. salina), as well single-specimen that served to analyse gene expression across four developmental stages in D. sinensis. are evaluated by computing profiles the different which consistently placed eggs small larvae (at stage instar A-8) similar each other, apart from adults...
Abstract This report provides insights into ways that paleolimnology is becoming, and can continue to be more diverse, equitable inclusive. Ideas presented here came during the organization, in part, out of a special session held Joint Meeting International Association Limnogeology (IAL) Paleolimnology (IPA), conducted virtually (27–29 April 2022) in-person, Bariloche, Argentina (27 November 1 December 2022). It was first time 55 years combined IAL-IPA meeting (held separately prior 2018)...
Abstract Lake Tzibaná is one of the largest (1.27 km 2 ) and deepest (Z max = 52 m) karstic lakes in UNESCO’s Biosphere Reserve “Nahá-Metzabok” Lacandon Forest, southeastern Mexico. It archives sediments from multiple sources inflowing Nahá River forms deltaic deposits. In 2019, water level declined by ~ 15 m, persisting for 4 months exposing Delta. A geophysical profile on exposed delta revealed an accumulation 20 m such Three sediment outcrops inactive channel Delta, which ranged height...
<p>Lakes on the Tibetan Plateau are especially vulnerable to global warming and increasing temperatures but also sensitive changes in atmospheric circulation such as Westerlies Asian Summer Monsoon, which main drivers of precipitation Plateau. Shallow lake environments high-altitudinal areas, not directly influenced by meltwater supply, excellent study sites determine evaporation. Here, we present a 300-year high-resolution chironomid record from high-altitude (> 4,733 m...
Abstract. We evaluated how ranges of four endemic and non-endemic aquatic ostracode species changed in response to long-term (glacial-interglacial cycles) abrupt climate fluctuations during the last 155 ka northern Neotropical region. employed two complementary approaches, fossil records distribution modeling (SDM). Fossil assemblages were obtained from sediment cores PI-1, PI-2, PI-6 Petén-Itzá 22-VIII-99 Petén Itzá Scientific Drilling Project, Lake Itzá, Guatemala. To obtain a spatially...
<p>High altitudinal aquatic ecosystems are subject to environmental change due global warming and increasing solar radiation. The Nam Co catchment is part of the highest largest alpine plateau on Earth, where effects climate expressed stronger than average. Thus, this area has experienced rapid changes in biodiversity. Fluctuations between wetter drier periods during last 2,000 calibrated (cal.) years were detected. These may alter dynamics therefore their resilience...