Mark Brenner
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View article: Vulnerability of blue carbon to sea-level rise in coastal freshwater ecosystems
Vulnerability of blue carbon to sea-level rise in coastal freshwater ecosystems Open
Coastal freshwater ecosystems are economically and ecologically important and provide multiple environmental services worldwide. They sequester carbon at rates ten times faster, and store five times more carbon per unit area than do mature…
View article: Classic Maya response to multiyear seasonal droughts in Northwest Yucatán, Mexico
Classic Maya response to multiyear seasonal droughts in Northwest Yucatán, Mexico Open
Protracted droughts may have contributed to sociopolitical upheaval and depopulation of cultural centers in the Maya Lowlands during the Terminal Classic Period (~800 to 1000 CE). Regional proxy climate records suggest multiple prolonged d…
View article: Flooded mangroves as a record of sediment accretion and carbon burial rates during Holocene sea-level rise in Rio Lagartos, northern Yucatan Peninsula, Mexico
Flooded mangroves as a record of sediment accretion and carbon burial rates during Holocene sea-level rise in Rio Lagartos, northern Yucatan Peninsula, Mexico Open
Coastal zones are dynamic regions that change over time because of both natural processes and human activities. Such changes occur over different time scales, from days (e.g., those caused by hurricanes) to millennia (e.g., those caused by…
View article: Comparison of Historical and Speleothem (Paleo)climate Records from Northwest Yucatán (Mexico)
Comparison of Historical and Speleothem (Paleo)climate Records from Northwest Yucatán (Mexico) Open
Paleoclimate studies on the Yucatán Peninsula, Mexico, are important for understanding relationships between past climate change and ancient Maya cultural evolution. The Postclassic Maya capital of Mayapán is a site of interest f…
View article: Influence of the Keystone Grazer, Sesarma reticulatum, on the Hydrology and Organic Matter Cycling in Salt Marshes of the Southeastern USA
Influence of the Keystone Grazer, Sesarma reticulatum, on the Hydrology and Organic Matter Cycling in Salt Marshes of the Southeastern USA Open
In salt marshes of the Southeastern USA, purple marsh crabs ( Sesarma reticulatum ), hereafter Sesarma , aggregate in grazing and burrowing fronts at the heads of tidal creeks, accelerating creek incision into marsh platforms. We explored …
View article: Stalagmites with ‘drip cups’ – are they suitable for palaeotemperature reconstructions?
Stalagmites with ‘drip cups’ – are they suitable for palaeotemperature reconstructions? Open
Stalagmites (carbonate deposits in caves) are excellent archives of palaeoenvironmental changes, as they are not only amenable to high-precision radiometric dating but host numerous proxy variables that reflect past changes in climate cond…
View article: Workshop on drilling the Nicaraguan lakes: bridging continents and oceans (NICA-BRIDGE)
Workshop on drilling the Nicaraguan lakes: bridging continents and oceans (NICA-BRIDGE) Open
An international, multidisciplinary research group is proposing the “NICA-BRIDGE” drilling project, within the framework of the International Continental Scientific Drilling Program (ICDP). The project goal is to conduct scientific drillin…
View article: Planning for the Lake Izabal Basin Research Endeavor (LIBRE) continental scientific drilling project in eastern Guatemala
Planning for the Lake Izabal Basin Research Endeavor (LIBRE) continental scientific drilling project in eastern Guatemala Open
As Earth's atmospheric temperatures and human populations increase, more people are becoming vulnerable to natural and human-induced disasters. This is particularly true in Central America, where the growing human population is experiencin…
View article: Past fire dynamics inferred from polycyclic aromatic hydrocarbons and monosaccharide anhydrides in a stalagmite from the archaeological site of Mayapan, Mexico
Past fire dynamics inferred from polycyclic aromatic hydrocarbons and monosaccharide anhydrides in a stalagmite from the archaeological site of Mayapan, Mexico Open
Speleothems (cave stalagmites) contain inorganic and organic substances that can be used to infer past changes in local and regional paleoenvironmental conditions. Specific biomarkers can be employed to elucidate the history of past fires,…
View article: Millennial hydrological variability in the continental northern Neotropics during Marine Isotope Stages (MISs) 3–2 (59–15 cal ka BP) inferred from sediments of Lake Petén Itzá, Guatemala
Millennial hydrological variability in the continental northern Neotropics during Marine Isotope Stages (MISs) 3–2 (59–15 cal ka BP) inferred from sediments of Lake Petén Itzá, Guatemala Open
Lake Petén Itzá (Guatemala) possesses one of the longest lacustrine sediment records in the northern Neotropics, which enabled study of paleoclimate variability in the region during the last ∼400 000 years. We used geochemical (Ti, Ca/(Ti+…
View article: Comment on bg-2023-63
Comment on bg-2023-63 Open
Abstract. Speleothems (cave stalagmites) contain inorganic and organic substances that can be used to infer past changes in local and regional paleoenvironmental conditions. Specific biomarkers can be employed to elucidate the history of p…
View article: Cyclical browning in a subtropical lake inferred from diatom records
Cyclical browning in a subtropical lake inferred from diatom records Open
Changing climate and land use activity are altering inputs of colored dissolved organic carbon (cDOC) into lakes. Increased cDOC reduces water transparency (browning) and changes lake physicochemistry, with biological consequences. Identif…
View article: Past fire dynamics inferred from polycyclic aromatic hydrocarbons and monosaccharide anhydrides in a stalagmite from the archaeological site of Mayapan, Mexico
Past fire dynamics inferred from polycyclic aromatic hydrocarbons and monosaccharide anhydrides in a stalagmite from the archaeological site of Mayapan, Mexico Open
Speleothems (cave stalagmites) contain inorganic and organic substances that can be used to infer past changes in local and regional paleoenvironmental conditions. Specific biomarkers can be employed to elucidate the history of past fires,…
View article: Supplementary material to "Past fire dynamics inferred from polycyclic aromatic hydrocarbons and monosaccharide anhydrides in a stalagmite from the archaeological site of Mayapan, Mexico"
Supplementary material to "Past fire dynamics inferred from polycyclic aromatic hydrocarbons and monosaccharide anhydrides in a stalagmite from the archaeological site of Mayapan, Mexico" Open
Cave survey and stalagmite sample MAYA-22-7Because only very rough scetch maps were available, our team surveyed part of Cenote Ch'en Mul in August 2022 (Fig. S1).The cenote is in direct vicinity to the Kukulcan temple and the observatory …
View article: Molluscs Across Space and Through Time in a Hypersaline Coastal Lagoon, Mexico
Molluscs Across Space and Through Time in a Hypersaline Coastal Lagoon, Mexico Open
Biotic remains have been used in paleoecological studies to provide information on past environmental conditions. Death assemblages can be used to make inferences about past environmental conditions if modern optima and ranges of taxa are …
View article: Molluscs along a salinity gradient in a hypersaline coastal lagoon, southern Gulf of Mexico
Molluscs along a salinity gradient in a hypersaline coastal lagoon, southern Gulf of Mexico Open
Molluscs are a diverse phylum in coastal lagoons because the numerous taxa collectively display broad ranges of optima and tolerance with respect to ambient conditions. We report on the taxonomic composition, habitat preferences and feedin…
View article: Comment on egusphere-2022-787
Comment on egusphere-2022-787 Open
Abstract. We inferred hydrological changes in Lake Petén Itzá (Guatemala) during Marine Isotope Stages (MIS) 3-2 using geochemical (Ti, Ca/Ti+Al+Fe ratio and Mn/Fe) and mineralogical (carbonates, gypsum, quartz, clay) data from sediment co…
View article: Comment on egusphere-2022-787
Comment on egusphere-2022-787 Open
We inferred hydrological changes in Lake Petén Itzá (Guatemala) during Marine Isotope Stages (MIS) 3-2 using geochemical (Ti, Ca/Ti+Al+Fe ratio and Mn/Fe) and mineralogical (carbonates, gypsum, quartz, clay) data from sediment core PI-2 to…
View article: Millennial hydrological variability in the continental northern Neotropics during MIS3-2 inferred from sediments of Lake Petén Itzá, Guatemala
Millennial hydrological variability in the continental northern Neotropics during MIS3-2 inferred from sediments of Lake Petén Itzá, Guatemala Open
We inferred hydrological changes in Lake Petén Itzá (Guatemala) during Marine Isotope Stages (MIS) 3-2 using geochemical (Ti, Ca/Ti+Al+Fe ratio and Mn/Fe) and mineralogical (carbonates, gypsum, quartz, clay) data from sediment core PI-2 to…
View article: Early Maize in the Maya Area
Early Maize in the Maya Area Open
The history of maize in Central America and surrounding areas has implications for the slow transition from hunting and gathering to agriculture. The spread of early forms of domesticated maize from southern Mexico across Mesoamerica and i…
View article: An ultra-high-resolution seasonal-scale stalagmite palaeoclimate record from the Yucatán peninsula, spanning the Maya Terminal Classic period.
An ultra-high-resolution seasonal-scale stalagmite palaeoclimate record from the Yucatán peninsula, spanning the Maya Terminal Classic period. Open
<p>It has now been over 25 years since stable isotope data from lake sediment cores was first used to provide quantitative evidence of increased aridity in the Yucat&#225;n peninsula during the Maya Terminal Classic period (c.800…
View article: Influence of Late Holocene Climate Change and Human Land Use on Terrestrial and Aquatic Ecosystems in Southwest Madagascar
Influence of Late Holocene Climate Change and Human Land Use on Terrestrial and Aquatic Ecosystems in Southwest Madagascar Open
Madagascar’s biota underwent substantial change following human colonization of the island in the Late Holocene. The timing of human arrival and its role in the extinction of megafauna have received considerable attention. However, the imp…
View article: Harmful algal blooms and cyanotoxins in Lake Amatitlán, Guatemala, coincided with ancient Maya occupation in the watershed
Harmful algal blooms and cyanotoxins in Lake Amatitlán, Guatemala, coincided with ancient Maya occupation in the watershed Open
Significance Harmful algal blooms (HABs) are dense populations of algae and/or cyanobacteria that can harm aquatic ecosystems by reducing water column oxygen and producing toxins. Whereas HABs are well documented in modern lakes, there has…
View article: New estimates of the magnitude of the sea-level jump during the 8.2 ka event
New estimates of the magnitude of the sea-level jump during the 8.2 ka event Open
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. yr B.P.), marine waters entered the lake, which presently lies ~38 km from the Carib…
View article: Drought Coincided with, but Does Not Explain, Late Holocene Megafauna Extinctions in SW Madagascar
Drought Coincided with, but Does Not Explain, Late Holocene Megafauna Extinctions in SW Madagascar Open
Climate drying could have transformed ecosystems in southern Madagascar during recent millennia by contributing to the extinction of endemic megafauna. However, the extent of regional aridification during the past 2000 years is poorly know…