Mark Brenner
Biographic Data
| ID | 3636960 |
|---|---|
| NAME | Mark Brenner |
| GIVEN NAMES | Mark |
| FAMILY NAME | Brenner |
| SIGNATURE | BRENNER M |
| AFFILIATIONS | University of Florida |
| ORCID | 0000-0001-9837-012X |
| VERIFIED | Yes |
| TOTAL WORKS | 36 |
| TOTAL CITATIONS | 229 |
| WORKS AS AUTHOR | 36 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 1979 |
| LATEST PUBLICATION YEAR | 2022 |
| H-INDEX | 6 |
Early Maize in the Maya Area
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 into South America has been dated to about 8,700-6,500 years ago on the basis of a handful of studies relying primarily on the analysis of pollen, phytoliths, or starch grains. Recent genomic data from southern B…
Ecological turnover in neotropical freshwater and terrestrial communities during episodes of abrupt climate change
The last 85,000 years were characterized by high climate and environmental variability on the Yucatán Peninsula. Heinrich stadials are examples of abrupt climate transitions that involved shifts in regional temperatures and moisture availability. Thus, they serve as natural experiments to evaluate the contrasting responses of aquatic and terrestrial ecosystems. We used ostracodes and pollen preserved in a 75.9-m-long sediment core (PI-6, ~85 ka) …
Novel responses of diatoms in neotropical mountain lakes to indigenous and post-European occupation
Holocene environmental history of tropical, mid-altitude Lake Ocotalito, México, inferred from ostracodes and non-biological indicators
This paleolimnological study used ostracodes assemblages, element concentrations, organic and inorganic carbon content, organic C:N ratios, and stable isotope values in valves of the ostracodes Cytheridella ilosvayi as paleoindicators and is the first such investigation from a mid-elevation site in southern México. We provide a ~7600-year (9540–1970 BP) environmental history from karst Lake Ocotalito (920 m a.s.l.), which lies in the Lacandon For…
Rethinking Well-Being in Terms of Affliction and Equanimity
This study aimed to validate a self-report assessment instrument developed based on the affliction-equanimity model of holistic well-being. An expert panel developed a pool of items, which were tested through an online questionnaire. Exploratory and confirmatory analyses were conducted. The analyses revealed seven factors related to affliction and equanimity and showed an adequate fit for the first-order seven-factor structure. The factors correl…
Middle to late Holocene relative sea level rise, climate variability and environmental change along the Colombian Caribbean coast
We analyzed diatoms, lithology, and stable isotopes in a sediment core from the Ciénaga Grande de Santa Marta lagoon to reveal the history of late Holocene relative sea level rise and the ontogeny of the lagoon on the Caribbean coast of Colombia. At ~5300 cal. yr BP, the area was characterized by shallow, freshwater ponds that were prone to seasonal flooding. From ~4250 to ~2060 cal. yr BP, these ponds became brackish as relative sea level began …
Reformers Resurgent? A Survey of Recent Rank-and-File Uprisings
Environmental and cultural changes in highland Guatemala inferred from Lake Amatitlán sediments
We inferred the late Holocene environmental history of the Guatemala highlands from multiple lines of evidence in a sediment core from Lake Amatitlán. Inferred environmental changes are generally synchronous with archaeologically documented highland Maya cultural shifts. Population increases in the Middle Preclassic, Early Classic, and Late Postclassic are associated with deforestation and soil erosion. Land abandonment in the Late Preclassic, La…
Climate drying and associated forest decline in the lowlands of northern Guatemala during the late Holocene
Palynological studies document forest disappearance during the late Holocene in the tropical Maya lowlands of northern Guatemala. The question remains as to whether this vegetation change was driven exclusively by anthropogenic deforestation, as previously suggested, or whether it was partly attributable to climate changes. We report multiple palaeoclimate and palaeoenvironment proxies (pollen, geochemical, sedimentological) from sediment cores c…
Quantification of soil erosion rates related to ancient Maya deforestation
We used seismic and sediment core data to quantify soil erosion rates for the past ~6000 yr in the closed catchment of Lake Salpetén, in the tropical lowlands of northern Guatemala. The region was affected by ancient Maya land use from before ca. 1000 B.C. to A.D. 900. This period of human impact coincided with deposition in the lake of a detrital unit (Maya Clay) as much as 7 m thick that contrasts sharply with the relatively organic-rich gyttja…
Foreign direct investment and gendered wages in urban China
This paper documents the changing impact of foreign direct investment (FDI) on gendered wages in urban China. Combining household survey data from 1995 and 2002 with province-level macro-data, the paper finds that FDI as a proportion of investment has a sizable and statistically significant positive effect on both female and male wages in both years. In 1995, women experienced larger gains from FDI than men, but those gender-based advantages had …
Women and Class
Forty years ago this summer, a group of women and men came together to form the National Organization for Women (NOW). NOW's mission was to fight for gender equality through education and litigation. While not the only group fighting for women's rights, it quickly became one of the best known and largest. Today, NOW has over a half million members and over 500 chapters throughout the country. NOW was founded at a time when women were entering the…
Climate change on the Yucatan Peninsula during the Little Ice Age
We studied a 5.1-m sediment core from Aguada X'caamal (20° 36.6′N, 89° 42.9′W), a small sinkhole lake in northwest Yucatan, Mexico. Between 1400 and 1500 A.D., oxygen isotope ratios of ostracod and gastropod carbonate increased by an average of 2.2‰ and the benthic foraminifer Ammonia beccarii parkinsoniana appeared in the sediment profile, indicating a hydrologic change that included increased lake water salinity. Pollen from a core in nearby Ce…
Terminal Classic drought in the northern Maya lowlands inferred from multiple sediment cores in Lake Chichancanab (Mexico)
Abrupt Biological Response to Hydrologic and Land-use Changes in Lake Apopka, Florida, USA
Lake Apopka is a shallow, hypereutrophic lake in north-central Florida that experienced an abrupt shift in primary producer community structure (PPCS) in 1947. The PPCS shift was so abrupt anecdotal accounts report that dominant, submersed aquatic vegetation was uprooted by a hurricane in 1947 and replaced by phytoplankton within weeks. Here we propose two hypotheses to explain the sudden shift to phytoplankton. First, hydrologic modification of …
Abrupt Biological Response to Hydrologic and Land-use Changes in Lake Apopka, Florida, USA
Lake Apopka is a shallow, hypereutrophic lake in north-central Florida that experienced an abrupt shift in primary producer community structure (PPCS) in 1947. The PPCS shift was so abrupt anecdotal accounts report that dominant, submersed aquatic vegetation was uprooted by a hurricane in 1947 and replaced by phytoplankton within weeks. Here we propose two hypotheses to explain the sudden shift to phytoplankton. First, hydrologic modification of …
Spatial variation of strontium isotopes (87Sr/86Sr) in the Maya region
A 4000-Year Lacustrine Record of Environmental Change in the Southern Maya Lowlands, Petén, Guatemala
A 4000-yr sediment core record from Lake Salpetén, Guatemala, provides evidence for Maya-induced forest clearance and consequent soil erosion between ∼1700 cal yr B.C. and 850 cal yr A.D. Radiocarbon ages of wood, seeds, and charcoal support an age-depth model with average errors of ±110 cal yr. Relatively low carbonate δ 18 O values between 1300 and 400 cal yr B.C. coincide with pollen evidence for forest loss, consistent with increased surface …
Climate and Technological Innovation at Kaminaljuyu, Guatemala
During the years 2000 and 2001, a project was carried out to determine the paleoclimate in the Valley of Guatemala. There were two main objectives: (1) to compare and contrast the Highland data with that already obtained from the Maya Lowlands and the Caribbean region; and (2) to understand the relationship between climate and the disappearance of lakes and irrigated agriculture at the archaeological site of Kaminaljuyu in the Valley of Guatemala…
Paleolimnology of the Maya Lowlands
Since the late 1950s, scientists have used sediment cores from lakes on the Yucatan Peninsula to explore the complex interactions among climate, environment, and ancient Maya culture. Early paleolimnological studies generally assumed that late Holocene climate was invariable. Consequently, paleolimnologically inferred environmental changes that occurred during the past 3,000 years or so—for example, forest decline and soil erosion—were attributed…
Solar Forcing of Drought Frequency in the Maya Lowlands
We analyzed lake-sediment cores from the Yucatan Peninsula, Mexico, to reconstruct the climate history of the region over the past 2600 years. Time series analysis of sediment proxies, which are sensitive to the changing ratio of evaporation to precipitation (oxygen isotopes and gypsum precipitation), reveal a recurrent pattern of drought with a dominant periodicity of 208 years. This cycle is similar to the documented 206-year period in records …
Environmental thresholds and the empirical reality of state collapse
We are grateful for the opportunity to respondto Erickson's (1999) critique of our articles onhuman-environment interactions in the LakeTiticaca basin of Bolivia (Ortloff & Kolata 1993;Abbott et al. 1997; Binford et al. 1997). Hisdecision to publish this critique in ANTIQUITY,rather than in the journals in which our articlesappeared, permits us to reach a broaderaudience. Erickson labels our interpretationsa form of 'neo-environmental determinism…
A 10,300 14 C yr Record of Climate and Vegetation Change from Haiti
Pleistocene and Holocene vegetation dynamics in the American tropics are inferred largely from pollen in continental lake sediments. Maritime influences may have moderated climate and vegetation changes on Caribbean islands. Stable isotope (δ 18 O) study of a 7.6-m core from Lake Miragoane, Haiti, provided a high-resolution record of changing evaporation/precipitation (E/P) since ∼10,300 14 C yr B.P. The Miragoane pollen record documents climate …
Paleoclimate of Southwestern China for the Past 50,000 yr Inferred from Lake Sediment Records
Long sediment cores (12.5 and 13.5 m) from two lakes in Yunnan Province were used to infer the paleoclimate of southwest China over the past 50,000 yr. During the Holocene and marine isotope stage (MIS 3), bio-induced carbonate precipitation and organic matter (OM) production was high, suggesting warm temperatures and high primary productivity. In contrast, sediment inorganic carbon (IC) and organic carbon (OC) concentrations were low in last gla…
Climate change in the Lake Valencia Basin, Venezuela, ~12600 yr BP to present
We present a palaeoclimate record for northern South America, extending from the latest Pleistocene (~12600 14 C yr BP) to present. Climate reconstruction for the Valencia Basin, Venezuela, was based on sediment geochemistry and δ 18 O records from ostracod and gastropod shells in a 568 cm sediment core. Sediment chronology was established by AMS 14 C dating of terrestrial wood fragments. From ~12600 to ~10000 14 C yr BP the Valencia basin was dr…
Spatial variation of strontium isotopes (87Sr/86Sr) in the Maya region
A Holocene vegetation history from lowland Guatemala
A 5.45-m core from Lake Peten-Itza, lowland Guatemala, contains a near-complete record of Holo cene sedimentation. The age-depth relationship for the core is based on AMS 14 C dating of terrestrial wood fragments and provides a reliable chronology in this karst region where hard-water lake error has typically confounded sediment geochronology. In the basal part of the sequence, pollen of the Moraceae-Urticaceae group dominate, indicating the pres…
Environmental thresholds and the empirical reality of state collapse
We are grateful for the opportunity to respondto Erickson's (1999) critique of our articles onhuman-environment interactions in the LakeTiticaca basin of Bolivia (Ortloff & Kolata 1993;Abbott et al. 1997; Binford et al. 1997). Hisdecision to publish this critique in ANTIQUITY,rather than in the journals in which our articlesappeared, permits us to reach a broaderaudience. Erickson labels our interpretationsa form of 'neo-environmental determinism…
Paleolimnology of the Maya Lowlands
Since the late 1950s, scientists have used sediment cores from lakes on the Yucatan Peninsula to explore the complex interactions among climate, environment, and ancient Maya culture. Early paleolimnological studies generally assumed that late Holocene climate was invariable. Consequently, paleolimnologically inferred environmental changes that occurred during the past 3,000 years or so—for example, forest decline and soil erosion—were attributed…
Holocene climatic and human influences on lakes of the Yucatan Peninsula, Mexico
We used palaeolimnological techniques to examine effects of Holocene climate change and human influence on lakes of the Yucatan Peninsula, Mexico. The three study lakes are located along a west-east transect that represents a gradient of increasing modern precipitation and density of former Maya settlement. At Lake Coba, an 880-cm sediment core yields a complete record of lacustrine sedimentation that began when the lake first filled ∼8000 BP as …
Environmental and cultural changes in highland Guatemala inferred from Lake Amatitlán sediments
We inferred the late Holocene environmental history of the Guatemala highlands from multiple lines of evidence in a sediment core from Lake Amatitlán. Inferred environmental changes are generally synchronous with archaeologically documented highland Maya cultural shifts. Population increases in the Middle Preclassic, Early Classic, and Late Postclassic are associated with deforestation and soil erosion. Land abandonment in the Late Preclassic, La…
Foreign direct investment and gendered wages in urban China
This paper documents the changing impact of foreign direct investment (FDI) on gendered wages in urban China. Combining household survey data from 1995 and 2002 with province-level macro-data, the paper finds that FDI as a proportion of investment has a sizable and statistically significant positive effect on both female and male wages in both years. In 1995, women experienced larger gains from FDI than men, but those gender-based advantages had …
Climate change in the Lake Valencia Basin, Venezuela, ~12600 yr BP to present
We present a palaeoclimate record for northern South America, extending from the latest Pleistocene (~12600 14 C yr BP) to present. Climate reconstruction for the Valencia Basin, Venezuela, was based on sediment geochemistry and δ 18 O records from ostracod and gastropod shells in a 568 cm sediment core. Sediment chronology was established by AMS 14 C dating of terrestrial wood fragments. From ~12600 to ~10000 14 C yr BP the Valencia basin was dr…
Climate and Technological Innovation at Kaminaljuyu, Guatemala
During the years 2000 and 2001, a project was carried out to determine the paleoclimate in the Valley of Guatemala. There were two main objectives: (1) to compare and contrast the Highland data with that already obtained from the Maya Lowlands and the Caribbean region; and (2) to understand the relationship between climate and the disappearance of lakes and irrigated agriculture at the archaeological site of Kaminaljuyu in the Valley of Guatemala…
Early Maize in the Maya Area
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 into South America has been dated to about 8,700-6,500 years ago on the basis of a handful of studies relying primarily on the analysis of pollen, phytoliths, or starch grains. Recent genomic data from southern B…
Rethinking Well-Being in Terms of Affliction and Equanimity
This study aimed to validate a self-report assessment instrument developed based on the affliction-equanimity model of holistic well-being. An expert panel developed a pool of items, which were tested through an online questionnaire. Exploratory and confirmatory analyses were conducted. The analyses revealed seven factors related to affliction and equanimity and showed an adequate fit for the first-order seven-factor structure. The factors correl…
Middle to late Holocene relative sea level rise, climate variability and environmental change along the Colombian Caribbean coast
We analyzed diatoms, lithology, and stable isotopes in a sediment core from the Ciénaga Grande de Santa Marta lagoon to reveal the history of late Holocene relative sea level rise and the ontogeny of the lagoon on the Caribbean coast of Colombia. At ~5300 cal. yr BP, the area was characterized by shallow, freshwater ponds that were prone to seasonal flooding. From ~4250 to ~2060 cal. yr BP, these ponds became brackish as relative sea level began …
Abrupt Biological Response to Hydrologic and Land-use Changes in Lake Apopka, Florida, USA
Lake Apopka is a shallow, hypereutrophic lake in north-central Florida that experienced an abrupt shift in primary producer community structure (PPCS) in 1947. The PPCS shift was so abrupt anecdotal accounts report that dominant, submersed aquatic vegetation was uprooted by a hurricane in 1947 and replaced by phytoplankton within weeks. Here we propose two hypotheses to explain the sudden shift to phytoplankton. First, hydrologic modification of …
Novel responses of diatoms in neotropical mountain lakes to indigenous and post-European occupation
Mayan Urbanism
From the first millennium B.C. through the 9th-century A.D. Classic Maya collapse, nonurban populations grew exponentially, doubling every 408 years, in the twin-lake (Yaxha-Sacnab) basin that contained the Classic urban center of Yaxha. Pollen data show that forests were essentially cleared by Early Classic time. Sharply accelerated slopewash and colluviation, amplified in the Yaxha subbasin by urban construction, transferred nutrients plus calc…
Edward Smith Deevey, Jr
Edward Smith Deevey, Jr died on November 29, 1988, following a heart attack. He was Graduate Research Curator of Paleoecology at the Florida Museum of Natural History, University of Florida, Gainesville. As a reflection of his expertise in many academic disciplines, Ed held Graduate Research Professorships in four University of Florida departments: zoology, botany, geology and Latin American studies
Reconstruction of Caribbean climate change over the past 10,500 years
Possible role of climate in the collapse of Classic Maya civilization
Climate Variability on the Yucatan Peninsula (Mexico) during the Past 3500 Years, and Implications for Maya Cultural Evolution
Climate variability on the Yucatan Peninsula during the past 3500 yrs is reconstructed from the measurement of δ 18 O in monospecific ostracods and gastropods in a 6.3-m sediment core from Lake Punta Laguna, Mexico. This late Holocene record is divided into three periods based on changes in mean δ 18 O values. From ∼3310 to ∼1785 14 C yr B.P. (Period I), low mean δ 18 O values indicate relatively wet conditions (i.e., low evaporation to precipita…
A Holocene vegetation history from lowland Guatemala
A 5.45-m core from Lake Peten-Itza, lowland Guatemala, contains a near-complete record of Holo cene sedimentation. The age-depth relationship for the core is based on AMS 14 C dating of terrestrial wood fragments and provides a reliable chronology in this karst region where hard-water lake error has typically confounded sediment geochronology. In the basal part of the sequence, pollen of the Moraceae-Urticaceae group dominate, indicating the pres…
Holocene climatic and human influences on lakes of the Yucatan Peninsula, Mexico
We used palaeolimnological techniques to examine effects of Holocene climate change and human influence on lakes of the Yucatan Peninsula, Mexico. The three study lakes are located along a west-east transect that represents a gradient of increasing modern precipitation and density of former Maya settlement. At Lake Coba, an 880-cm sediment core yields a complete record of lacustrine sedimentation that began when the lake first filled ∼8000 BP as …
Climate Variation and the Rise and Fall of an Andean Civilization
Paleolimnological and archaeological records that span 3500 years from Lake Titicaca and the surrounding Bolivian–Peruvian altiplano demonstrate that the emergence of agriculture (ca. 1500 B.C.) and the collapse of the Tiwanaku civilization (ca. A.D. 1100) coincided with periods of abrupt, profound climate change. The timing and magnitude of climate changes are inferred from stratigraphic evidence of lake-level variation recorded in 14 C-dated la…
A 3500 14 C yr High-Resolution Record of Water-Level Changes in Lake Titicaca, Bolivia/Peru
Sediment cores collected from the southern basin of Lake Titicaca (Bolivia/Peru) on a transect from 4.6 m above overflow level to 15.1 m below overflow level are used to identify a new century-scale chronology of Holocene lake-level variations. The results indicate that lithologic and geochemical analyses on a transect of cores can be used to identify and date century-scale lake-level changes. Detailed sedimentary analyses of subfacies and radioc…
Cultural and Climatic History of Cobá, a Lowland Maya City in Quintana Roo, Mexico
Lake Cobá, within the archaeological site of Cobá, provides evidence bearing on lowland Maya development. Palynological and geochemical data record multidecadal precipitation cycles from a 8.80-m, >8370-yr lake-sediment sequence terminating on bedrock. Late Classic sedimentation rates are rapid, but an anthropogenically derived colluvium layer is lacking. Initial vegetation was medium semi-deciduous and swamp forest. Forest clearance began 1650 B…
Un registro de 6000 años de manifestaciones intensas del fenómeno de El Niño en sedimentos de lagunas de las islas Galápagos
Muchos de los modelos que se están desarrollando con el propósito de obtener un pronóstico efectivo del fenómeno de El Niño requieren datos históricos sobre el comportamiento del clima, y es especialmente importante para climatólogos el obtener datos de gran antigüedad. En los sedimentos de lagunas de las Islas Galápagos encontramos uno de los registros más antiguos y completos de la frecuencia con la que los eventos de más intensidad de El Niño …
A 10,300 14 C yr Record of Climate and Vegetation Change from Haiti
Pleistocene and Holocene vegetation dynamics in the American tropics are inferred largely from pollen in continental lake sediments. Maritime influences may have moderated climate and vegetation changes on Caribbean islands. Stable isotope (δ 18 O) study of a 7.6-m core from Lake Miragoane, Haiti, provided a high-resolution record of changing evaporation/precipitation (E/P) since ∼10,300 14 C yr B.P. The Miragoane pollen record documents climate …
Paleoclimate of Southwestern China for the Past 50,000 yr Inferred from Lake Sediment Records
Long sediment cores (12.5 and 13.5 m) from two lakes in Yunnan Province were used to infer the paleoclimate of southwest China over the past 50,000 yr. During the Holocene and marine isotope stage (MIS 3), bio-induced carbonate precipitation and organic matter (OM) production was high, suggesting warm temperatures and high primary productivity. In contrast, sediment inorganic carbon (IC) and organic carbon (OC) concentrations were low in last gla…
Climate change in the Lake Valencia Basin, Venezuela, ~12600 yr BP to present
We present a palaeoclimate record for northern South America, extending from the latest Pleistocene (~12600 14 C yr BP) to present. Climate reconstruction for the Valencia Basin, Venezuela, was based on sediment geochemistry and δ 18 O records from ostracod and gastropod shells in a 568 cm sediment core. Sediment chronology was established by AMS 14 C dating of terrestrial wood fragments. From ~12600 to ~10000 14 C yr BP the Valencia basin was dr…
Environmental thresholds and the empirical reality of state collapse
We are grateful for the opportunity to respondto Erickson's (1999) critique of our articles onhuman-environment interactions in the LakeTiticaca basin of Bolivia (Ortloff & Kolata 1993;Abbott et al. 1997; Binford et al. 1997). Hisdecision to publish this critique in ANTIQUITY,rather than in the journals in which our articlesappeared, permits us to reach a broaderaudience. Erickson labels our interpretationsa form of 'neo-environmental determinism…
Solar Forcing of Drought Frequency in the Maya Lowlands
We analyzed lake-sediment cores from the Yucatan Peninsula, Mexico, to reconstruct the climate history of the region over the past 2600 years. Time series analysis of sediment proxies, which are sensitive to the changing ratio of evaporation to precipitation (oxygen isotopes and gypsum precipitation), reveal a recurrent pattern of drought with a dominant periodicity of 208 years. This cycle is similar to the documented 206-year period in records …
A 4000-Year Lacustrine Record of Environmental Change in the Southern Maya Lowlands, Petén, Guatemala
A 4000-yr sediment core record from Lake Salpetén, Guatemala, provides evidence for Maya-induced forest clearance and consequent soil erosion between ∼1700 cal yr B.C. and 850 cal yr A.D. Radiocarbon ages of wood, seeds, and charcoal support an age-depth model with average errors of ±110 cal yr. Relatively low carbonate δ 18 O values between 1300 and 400 cal yr B.C. coincide with pollen evidence for forest loss, consistent with increased surface …
Climate and Technological Innovation at Kaminaljuyu, Guatemala
During the years 2000 and 2001, a project was carried out to determine the paleoclimate in the Valley of Guatemala. There were two main objectives: (1) to compare and contrast the Highland data with that already obtained from the Maya Lowlands and the Caribbean region; and (2) to understand the relationship between climate and the disappearance of lakes and irrigated agriculture at the archaeological site of Kaminaljuyu in the Valley of Guatemala…
Paleolimnology of the Maya Lowlands
Since the late 1950s, scientists have used sediment cores from lakes on the Yucatan Peninsula to explore the complex interactions among climate, environment, and ancient Maya culture. Early paleolimnological studies generally assumed that late Holocene climate was invariable. Consequently, paleolimnologically inferred environmental changes that occurred during the past 3,000 years or so—for example, forest decline and soil erosion—were attributed…
Spatial variation of strontium isotopes (87Sr/86Sr) in the Maya region
Climate change on the Yucatan Peninsula during the Little Ice Age
We studied a 5.1-m sediment core from Aguada X'caamal (20° 36.6′N, 89° 42.9′W), a small sinkhole lake in northwest Yucatan, Mexico. Between 1400 and 1500 A.D., oxygen isotope ratios of ostracod and gastropod carbonate increased by an average of 2.2‰ and the benthic foraminifer Ammonia beccarii parkinsoniana appeared in the sediment profile, indicating a hydrologic change that included increased lake water salinity. Pollen from a core in nearby Ce…
Terminal Classic drought in the northern Maya lowlands inferred from multiple sediment cores in Lake Chichancanab (Mexico)
Abrupt Biological Response to Hydrologic and Land-use Changes in Lake Apopka, Florida, USA
Lake Apopka is a shallow, hypereutrophic lake in north-central Florida that experienced an abrupt shift in primary producer community structure (PPCS) in 1947. The PPCS shift was so abrupt anecdotal accounts report that dominant, submersed aquatic vegetation was uprooted by a hurricane in 1947 and replaced by phytoplankton within weeks. Here we propose two hypotheses to explain the sudden shift to phytoplankton. First, hydrologic modification of …
Abrupt Biological Response to Hydrologic and Land-use Changes in Lake Apopka, Florida, USA
Lake Apopka is a shallow, hypereutrophic lake in north-central Florida that experienced an abrupt shift in primary producer community structure (PPCS) in 1947. The PPCS shift was so abrupt anecdotal accounts report that dominant, submersed aquatic vegetation was uprooted by a hurricane in 1947 and replaced by phytoplankton within weeks. Here we propose two hypotheses to explain the sudden shift to phytoplankton. First, hydrologic modification of …
Women and Class
Forty years ago this summer, a group of women and men came together to form the National Organization for Women (NOW). NOW's mission was to fight for gender equality through education and litigation. While not the only group fighting for women's rights, it quickly became one of the best known and largest. Today, NOW has over a half million members and over 500 chapters throughout the country. NOW was founded at a time when women were entering the…
Geography (27 works) · Geology and Paleoclimatology Research (26 works) · Archaeology and ancient environmental studies (21 works) · Physical geography (20 works) · Geology (17 works) · Holocene (16 works) · Climate change (15 works) · Archaeology (14 works) · Oceanography (14 works) · Geology (12 works)