keyword
MENU ▼
Read by QxMD icon Read
search

Paleo

keyword
https://www.readbyqxmd.com/read/28616163/a-genomic-assessment-of-species-boundaries-and-hybridization-in-a-group-of-highly-polymorphic-anoles-distichus-species-complex
#1
Daniel J MacGuigan, Anthony J Geneva, Richard E Glor
Delimiting young species is one of the great challenges of systematic biology, particularly when the species in question exhibit little morphological divergence. Anolis distichus, a trunk anole with more than a dozen subspecies that are defined primarily by dewlap color, may actually represent several independent evolutionary lineages. To test this, we utilized amplified fragment length polymorphisms (AFLP) genome scans and genetic clustering analyses in conjunction with a coalescent-based species delimitation method...
June 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28607415/molecular-phylogenies-indicate-a-paleo-tibetan-origin-of-himalayan-lazy-toads-scutiger
#2
Sylvia Hofmann, Matthias Stöck, Yuchi Zheng, Francesco G Ficetola, Jia-Tang Li, Ulrich Scheidt, Joachim Schmidt
The Himalaya presents an outstanding geologically active orogen and biodiversity hotspot. However, our understanding of the historical biogeography of its fauna is far from comprehensive. Many taxa are commonly assumed to have originated from China-Indochina and dispersed westward along the Himalayan chain. Alternatively, the "Tibetan-origin hypothesis" suggests primary diversification of lineages in Paleo-Tibet, and secondary diversification along the slopes of the later uplifted Greater Himalaya. We test these hypotheses in high-mountain megophryid anurans (Scutiger)...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28607045/mio-pliocene-aridity-in-the-south-central-andes-associated-with-southern-hemisphere-cold-periods
#3
William H Amidon, G Burch Fisher, Douglas W Burbank, Patricia L Ciccioli, Ricardo N Alonso, Andrew L Gorin, Perri H Silverhart, Andrew R C Kylander-Clark, Michael S Christoffersen
Although Earth's climate history is best known through marine records, the corresponding continental climatic conditions drive the evolution of terrestrial life. Continental conditions during the latest Miocene are of particular interest because global faunal turnover is roughly synchronous with a period of global glaciation from ∼6.2-5.5 Ma and with the Messinian Salinity Crisis from ∼6.0-5.3 Ma. Despite the climatic and ecological significance of this period, the continental climatic conditions associated with it remain unclear...
June 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28603673/a-methodology-of-theropod-print-replication-utilising-the-pedal-reconstruction-of-australovenator-and-a-simulated-paleo-sediment
#4
Matt A White, Alex G Cook, Steven J Rumbold
Distinguishing the difference between theropod and ornithopod footprints has proved a difficult task due to their similarities. Herein our aim was to produce a method where a skeleton could be more closely matched to actual fossilised footprints. The reconstructed pes of the Australian Megaraptoran Australovenator wintonensis was utilised for this footprint reconstruction. It was 3-D printed in life size, molded and cast to produce a flexible theropod foot for footprint creation. The Dinosaur Stampede National Monument, Lark Quarry, Queensland, Australia was used as our case study to compare fossilised dinosaur footprints with our reconstructed theropod prints...
2017: PeerJ
https://www.readbyqxmd.com/read/28598413/anthropogenic-climate-change-has-altered-primary-productivity-in-lake-superior
#5
M D O'Beirne, J P Werne, R E Hecky, T C Johnson, S Katsev, E D Reavie
Anthropogenic climate change has the potential to alter many facets of Earth's freshwater resources, especially lacustrine ecosystems. The effects of anthropogenic changes in Lake Superior, which is Earth's largest freshwater lake by area, are not well documented (spatially or temporally) and predicted future states in response to climate change vary. Here we show that Lake Superior experienced a slow, steady increase in production throughout the Holocene using (paleo)productivity proxies in lacustrine sediments to reconstruct past changes in primary production...
June 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28585926/a-monthly-global-paleo-reanalysis-of-the-atmosphere-from-1600-to-2005-for-studying-past-climatic-variations
#6
Jörg Franke, Stefan Brönnimann, Jonas Bhend, Yuri Brugnara
Climatic variations at decadal scales such as phases of accelerated warming or weak monsoons have profound effects on society and economy. Studying these variations requires insights from the past. However, most current reconstructions provide either time series or fields of regional surface climate, which limit our understanding of the underlying dynamics. Here, we present the first monthly paleo-reanalysis covering the period 1600 to 2005. Over land, instrumental temperature and surface pressure observations, temperature indices derived from historical documents and climate sensitive tree-ring measurements were assimilated into an atmospheric general circulation model ensemble using a Kalman filtering technique...
June 6, 2017: Scientific Data
https://www.readbyqxmd.com/read/28585365/tracking-a-century-of-changes-in-microbial-eukaryotic-diversity-in-lakes-driven-by-nutrient-enrichment-and-climate-warming
#7
Eric Capo, Didier Debroas, Fabien Arnaud, Marie-Elodie Perga, Cécile Chardon, Isabelle Domaizon
High-throughput sequencing of sedimentary DNA (sed-DNA) was utilized to reconstruct the temporal dynamics of microbial eukaryotic communities (MECs) at a centennial scale in two re-oligotrophicated lakes that were exposed to different levels of phosphorus enrichment. The temporal changes within the MECs were expressed in terms of richness, composition and community structure to investigate their relationships with two key forcing factors (i.e., nutrient enrichment and climate warming). Various groups, including Apicomplexa, Cercozoa, Chrysophyceae, Ciliophora, Chlorophyceae and Dinophyceae, responded to phosphorus enrichment levels with either positive or negative impacts on their richness and relative abundance...
June 5, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28582571/the-role-of-rubisco-kinetics-and-pyrenoid-morphology-in-shaping-the-ccm-of-haptophyte-microalgae
#8
Ana M C Heureux, Jodi N Young, Spencer M Whitney, Maeve R Eason-Hubbard, Renee B Y Lee, Robert E Sharwood, Rosalind E M Rickaby
The haptophyte algae are a cosmopolitan group of primary producers that contribute significantly to the marine carbon cycle and play a major role in paleo-climate studies. Despite their global importance, little is known about carbon assimilation in haptophytes, in particular the kinetics of their Form 1D CO2-fixing enzyme, Rubisco. Here we examine Rubisco properties of three haptophytes with a range of pyrenoid morphologies (Pleurochrysis carterae, Tisochrysis lutea, and Pavlova lutheri) and the diatom Phaeodactylum tricornutum that exhibit contrasting sensitivities to the trade-offs between substrate affinity (Km) and turnover rate (kcat) for both CO2 and O2...
June 3, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28582394/new-insight-into-hybridization-and-unidirectional-introgression-between-ammodytes-japonicus-and-ammodytes-heian-trachiniformes-ammodytidae
#9
Jin-Koo Kim, Seung Eun Bae, Soo Jeong Lee, Moon Geun Yoon
Based on northern (NOL) and southern (SOL) mitochondrial lineages, recently, it proposed the new species Ammodytes heian and revived the species name Ammodytes japonicus to describe sand lances from the northwestern Pacific Ocean. This study used molecular methods to investigate genetic relationships between the two sand lance species in Korea and Japan. In total, 154 specimens were collected from four locations in Korea (Baengnyeongdo in the Yellow Sea, Tongyeong in the Korean Strait, and Jumunjin and Gijang in the East Sea), and 50 specimens were collected from a single location in Japan (Wakkanai in the Okhotsk Sea)...
2017: PloS One
https://www.readbyqxmd.com/read/28566740/quaternary-fluvial-terraces-of-the-tiber-valley-geochronologic-and-geometric-constraints-on-the-back-arc-magmatism-related-uplift-in-central-italy
#10
Fabrizio Marra, Fabio Florindo, Carmelo Petronio
Through a geomorphological study relying on statistically assessed classes of hilltop elevations, we reconstruct a suite of paleo-surfaces along the Tiber River Valley north of Rome that we identify as fluvial terraces formed by interplay between global sea-level fluctuations and regional upift. Using biostratigraphic constraints provided by marine through continental deposits of Santernian age, we recognize the oldest terrace in this area, corresponding to an early coastal plain of late Santernian-Emilian age...
May 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28559352/tropical-cyclone-activity-enhanced-by-sahara-greening-and-reduced-dust-emissions-during-the-african-humid-period
#11
Francesco S R Pausata, Kerry A Emanuel, Marc Chiacchio, Gulilat T Diro, Qiong Zhang, Laxmi Sushama, J Curt Stager, Jeffrey P Donnelly
Tropical cyclones (TCs) can have devastating socioeconomic impacts. Understanding the nature and causes of their variability is of paramount importance for society. However, historical records of TCs are too short to fully characterize such changes and paleo-sediment archives of Holocene TC activity are temporally and geographically sparse. Thus, it is of interest to apply physical modeling to understanding TC variability under different climate conditions. Here we investigate global TC activity during a warm climate state (mid-Holocene, 6,000 yBP) characterized by increased boreal summer insolation, a vegetated Sahara, and reduced dust emissions...
May 30, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28555637/sea-level-records-from-the-u-s-mid-atlantic-constrain-laurentide-ice-sheet-extent-during-marine-isotope-stage-3
#12
T Pico, J R Creveling, J X Mitrovica
The U.S. mid-Atlantic sea-level record is sensitive to the history of the Laurentide Ice Sheet as the coastline lies along the ice sheet's peripheral bulge. However, paleo sea-level markers on the present-day shoreline of Virginia and North Carolina dated to Marine Isotope Stage (MIS) 3, from 50 to 35 ka, are surprisingly high for this glacial interval, and remain unexplained by previous models of ice age adjustment or other local (for example, tectonic) effects. Here, we reconcile this sea-level record using a revised model of glacial isostatic adjustment characterized by a peak global mean sea level during MIS 3 of approximately -40 m, and far less ice volume within the eastern sector of the Laurentide Ice Sheet than traditional reconstructions for this interval...
May 30, 2017: Nature Communications
https://www.readbyqxmd.com/read/28522869/ancient-river-inference-explains-exceptional-oriental-freshwater-mussel-radiations
#13
Ivan N Bolotov, Alexander V Kondakov, Ilya V Vikhrev, Olga V Aksenova, Yulia V Bespalaya, Mikhail Yu Gofarov, Yulia S Kolosova, Ekaterina S Konopleva, Vitaly M Spitsyn, Kitti Tanmuangpak, Sakboworn Tumpeesuwan
The concept of long-lived (ancient) lakes has had a great influence on the development of evolutionary biogeography. According to this insight, a number of lakes on Earth have existed for several million years (e.g., Baikal and Tanganyika) and represent unique evolutionary hotspots with multiple intra-basin radiations. In contrast, rivers are usually considered to be variable systems, and the possibility of their long-term existence during geological epochs has never been tested. In this study, we reconstruct the history of freshwater basin interactions across continents based on the multi-locus fossil-calibrated phylogeny of freshwater mussels (Unionidae)...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28516958/the-origin-and-degassing-history-of-the-earth-s-atmosphere-revealed-by-archean-xenon
#14
Guillaume Avice, Bernard Marty, Ray Burgess
Xenon (Xe) is an exceptional tracer for investigating the origin and fate of volatile elements on Earth. The initial isotopic composition of atmospheric Xe remains unknown, as do the mechanisms involved in its depletion and isotopic fractionation compared with other reservoirs in the solar system. Here we present high precision analyses of noble gases trapped in fluid inclusions of Archean quartz (Barberton, South Africa) that reveal the isotopic composition of the paleo-atmosphere at ≈3.3 Ga. The Archean atmospheric Xe is mass-dependently fractionated by 12...
May 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28515078/shifting-quaternary-migration-patterns-in-the-bahamian-archipelago-evidence-from-the-zamia-pumila-complex-at-the-northern-limits-of-the-caribbean-island-biodiversity-hotspot
#15
Dayana E Salas-Leiva, Alan W Meerow, Michael Calonje, Javier Francisco-Ortega, M Patrick Griffith, Kyoko Nakamura, Vanessa Sánchez, Lindy Knowles, David Knowles
PREMISE OF THE STUDY: The Bahamas archipelago is formed by young, tectonically stable carbonate banks that harbor direct geological evidence of global ice-volume changes. We sought to detect signatures of major changes on gene flow patterns and reconstruct the phylogeographic history of the monophyletic Zamia pumila complex across the Bahamas. METHODS: Nuclear molecular markers with both high and low mutation rates were used to capture two different time scale signatures and test several gene flow and demographic hypotheses...
May 17, 2017: American Journal of Botany
https://www.readbyqxmd.com/read/28500352/whole-mantle-convection-with-tectonic-plates-preserves-long-term-global-patterns-of-upper-mantle-geochemistry
#16
T L Barry, J H Davies, M Wolstencroft, I L Millar, Z Zhao, P Jian, I Safonova, M Price
The evolution of the planetary interior during plate tectonics is controlled by slow convection within the mantle. Global-scale geochemical differences across the upper mantle are known, but how they are preserved during convection has not been adequately explained. We demonstrate that the geographic patterns of chemical variations around the Earth's mantle endure as a direct result of whole-mantle convection within largely isolated cells defined by subducting plates. New 3D spherical numerical models embedded with the latest geological paleo-tectonic reconstructions and ground-truthed with new Hf-Nd isotope data, suggest that uppermost mantle at one location (e...
May 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28494281/using-%C3%AE-dn-alkane-as-a-proxy-for-paleo-environmental-reconstruction-a-good-choice-to-sample-at-the-site-dominated-by-woods
#17
Jinzhao Liu, Zhisheng An, Zheng Wang, Huawu Wu
Some studies have demonstrated that leaf wax δDn-alkane values for a single species varied significantly with seasons. However, it is still not clear that the seasonality patterns of leaf wax δDn-alkane values in higher plants. Meanwhile, few efforts have been pursued to assess the effect of the light slopes (sunny vs. cloudy) on leaf wax δDn-alkane values. In this study, we systematically investigated plant wax δDn-alkane values and soil n-alkane δD values along different light slopes in different seasons (spring vs...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28483865/behavioural-ecological-and-evolutionary-responses-to-extreme-climatic-events-challenges-and-directions
#18
Martijn van de Pol, Stéphanie Jenouvrier, Johannes H C Cornelissen, Marcel E Visser
More extreme climatic events (ECEs) are among the most prominent consequences of climate change. Despite a long-standing recognition of the importance of ECEs by paleo-ecologists and macro-evolutionary biologists, ECEs have only recently received a strong interest in the wider ecological and evolutionary community. However, as with many rapidly expanding fields, it lacks structure and cohesiveness, which strongly limits scientific progress. Furthermore, due to the descriptive and anecdotal nature of many ECE studies it is still unclear what the most relevant questions and long-term consequences are of ECEs...
June 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28455508/the-paradox-of-a-long-grounding-during-west-antarctic-ice-sheet-retreat-in-ross-sea
#19
Philip J Bart, Benjamin J Krogmeier, Manon P Bart, Slawek Tulaczyk
Marine geological data show that the West Antarctic Ice Sheet (WAIS) advanced to the eastern Ross Sea shelf edge during the Last Glacial Maximum (LGM) and eventually retreated ~1000 km to the current grounding-line position on the inner shelf. During the early deglacial, the WAIS deposited a voluminous stack of overlapping grounding zone wedges (GZWs) on the outer shelf of the Whales Deep Basin. The large sediment volume of the GZW cluster suggests that the grounding-line position of the paleo-Bindschadler Ice Stream was relatively stationary for a significant time interval...
April 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28450227/spatial-phylogenetics-of-the-vascular-flora-of-chile
#20
Rosa A Scherson, Andrew H Thornhill, Rafael Urbina-Casanova, William A Freyman, Patricio A Pliscoff, Brent D Mishler
Current geographic patterns of biodiversity are a consequence of the evolutionary history of the lineages that comprise them. This study was aimed at exploring how evolutionary features of the vascular flora of Chile are distributed across the landscape. Using a phylogeny at the genus level for 87% of the Chilean vascular flora, and a geographic database of sample localities, we calculated phylogenetic diversity (PD), phylogenetic endemism (PE), relative PD (RPD), and relative PE (RPE). Categorical Analyses of Neo- and Paleo-Endemism (CANAPE) were also performed, using a spatial randomization to assess statistical significance...
April 24, 2017: Molecular Phylogenetics and Evolution
keyword
keyword
7570
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"