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https://www.readbyqxmd.com/read/28812639/late-pliocene-environmental-change-during-the-transition-from-australopithecus-to-homo
#1
Joshua R Robinson, John Rowan, Christopher J Campisano, Jonathan G Wynn, Kaye E Reed
It has long been hypothesized that the transition from Australopithecus to Homo in eastern Africa was linked to the spread of open and arid environments near the Plio-Pleistocene boundary, but data for the latest Pliocene are scarce. Here we present new stable carbon isotope data from the late Pliocene mammalian fauna from Ledi-Geraru, in the lower Awash Valley (LAV), Ethiopia, and mammalian community analyses from the LAV and Turkana Basin. These data, combined with pedogenic carbonate stable isotopes, indicate that the two regions were largely similar through the Plio-Pleistocene, but that important environmental differences existed during the emergence of Homo around 2...
May 15, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812616/legacy-effects-of-developmental-stages-determine-the-functional-role-of-predators
#2
Volker H W Rudolf, B G Van Allen
Predators are instrumental in structuring natural communities and ecosystem processes. The strong effects of predators are often attributed to their high trophic position in the food web. However, most predators have to grow and move up the food chain before reaching their final trophic position, and during this developmental process their traits, interactions and abundances change. Here, we show that this process of 'moving up' the food chain during development strongly determines the ecological role of a predator...
January 13, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812603/climate-change-upends-selection-on-ornamentation-in-a-wild-bird
#3
Simon R Evans, Lars Gustafsson
Secondary sexual traits have high heritabilities and are exposed to strong, environmentally sensitive selection, and so are expected to evolve rapidly in response to sustained environmental change. We examine the eco-evolutionary dynamics of ornament expression in a long-term study population of collared flycatchers, Ficedula albicollis, in which forehead patch size, which positively influences male reproductive success, declined markedly over 34 years. Annual fitness selection on forehead patch size switched from positive to negative during the study, a reversal that is accounted for by rising spring temperatures at the breeding site: highly ornamented males were selectively favoured following cold breeding seasons but selected against following warm breeding seasons...
January 23, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812178/sludge-quantification-at-water-treatment-plant-and-its-management-scenario
#4
Tarique Ahmad, Kafeel Ahmad, Mehtab Alam
Large volume of sludge is generated at the water treatment plants during the purification of surface water for potable supplies. Handling and disposal of sludge require careful attention from civic bodies, plant operators, and environmentalists. Quantification of the sludge produced at the treatment plants is important to develop suitable management strategies for its economical and environment friendly disposal. Present study deals with the quantification of sludge using empirical relation between turbidity, suspended solids, and coagulant dosing...
August 15, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28812036/incidence-of-sports-related-concussion-among-ncaa-women-s-ice-hockey-athletes
#5
Emily M Brook, Emily Kroshus, Caroline H Hu, Marissa Gedman, Jamie E Collins, Elizabeth G Matzkin
BACKGROUND: There are limited data on the incidence of concussion and concussion symptom nondisclosure among collegiate women's ice hockey athletes. PURPOSE: To determine the incidence of sports-related concussion (SRC) in National Collegiate Athletic Association (NCAA) women's ice hockey athletes. STUDY DESIGN: Descriptive epidemiology study. METHODS: An anonymous online survey was completed by 459 NCAA women's ice hockey athletes...
July 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28812033/epidemiology-of-injuries-identified-at-the-nfl-scouting-combine-and-their-impact-on-performance-in-the-national-football-league-evaluation-of-2203-athletes-from-2009-to-2015
#6
Brendin R Beaulieu-Jones, William H Rossy, George Sanchez, James M Whalen, Kyle P Lavery, Kevin J McHale, Bryan G Vopat, Joseph J Van Allen, Ramesses A Akamefula, Matthew T Provencher
BACKGROUND: At the annual National Football League (NFL) Scouting Combine, the medical staff of each NFL franchise performs a comprehensive medical evaluation of all athletes potentially entering the NFL. Currently, little is known regarding the overall epidemiology of injuries identified at the combine and their impact on NFL performance. PURPOSE: To determine the epidemiology of injuries identified at the combine and their impact on initial NFL performance. STUDY DESIGN: Cohort study; Level of evidence, 3...
July 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28811882/seasonal-changes-in-leaf-chemistry-and-leaf-selection-of-the-japanese-giant-flying-squirrel-upon-two-tree-species
#7
Mutsumi Ito, Noriko Tamura, Fumio Hayashi
Tree leaves are important food sources for arboreal herbivores, such as primates, rodents, and marsupials. These animals do not eat leaves randomly in habitats with many tree species but rather choose based on the chemical components of leaves, such as sugars, fibers, proteins, and toxins. However, the effects of the microscale distribution of these chemicals within each leaf have not been examined for these animals. The giant flying squirrels Petaurista leucogenys are entirely arboreal, nocturnal herbivores, usually feeding on leaves and dropping leaf debris on the ground after partially consuming them...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28811881/self-and-intra-morph-incompatibility-and-selection-analysis-of-an-inconspicuous-distylous-herb-growing-on-the-tibetan-plateau-primula-tibetica
#8
Xian-Feng Jiang, Qing-Jun Li
There is discussion over whether pollen limitation exerts selection on floral traits to increase floral display or selects for traits that promote autonomous self-fertilization. Some studies have indicated that pollen limitation does not mediate selection on traits associated with either pollinator attraction or self-fertilization. Primula tibetica is an inconspicuous cross-fertilized plant that may suffer from pollen limitation. We conducted a selection analysis on P. tibetica to investigate whether pollen limitation results in selection for an increased floral display in case the evolution of autonomous self-fertilization has been difficult for this plant...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28811878/magellanic-penguin-telomeres-do-not-shorten-with-age-with-increased-reproductive-effort-investment-and-basal-corticosterone
#9
Jack A Cerchiara, Rosa Ana Risques, Donna Prunkard, Jeffrey R Smith, Olivia J Kane, P Dee Boersma
All species should invest in systems that enhance longevity; however, a fundamental adult life-history trade-off exists between the metabolic resources allocated to maintenance and those allocated to reproduction. Long-lived species will invest more in reproduction than in somatic maintenance as they age. We investigated this trade-off by analyzing correlations among telomere length, reproductive effort and output, and basal corticosterone in Magellanic penguins (Spheniscus magellanicus). Telomeres shorten with age in most species studied to date, and may affect adult survival...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28811780/role-of-vitamin-d-in-reducing-number-of-acute-exacerbations-in-chronic-obstructive-pulmonary-disease-copd-patients
#10
Dur Muhammad Khan, Aziz Ullah, Fawad Ahmad Randhawa, Somia Iqtadar, Nasir Farooq Butt, Khadija Waheed
BACKGROUND AND OBJECTIVE: Chronic obstructive pulmonary disease (COPD) is characterized by chronic incompletely reversible poor airflow and air trapping and usually this debilitating disorder limits the outside activities of the patients depriving them of sunlight which is a rich source of Vitamin D. The objective of this study was to determine the effect of vitamin D supplementation in reducing number of acute exacerbation in COPD patients. METHODS: This randomized control trial was conducted at East Medical Ward Mayo Hospital Lahore from January to December 2015 as exacerbations of COPD are season dependent...
May 2017: Pakistan Journal of Medical Sciences Quarterly
https://www.readbyqxmd.com/read/28811752/occurrence-and-epidemics-of-bacterial-canker-of-kiwifruit-in-korea
#11
REVIEW
Gyoung Hee Kim, Jae Sung Jung, Young Jin Koh
Bacterial canker is the largest limiting factor in the cultivation and production of kiwifruit worldwide. Typical symptoms comprise necrotic spots on leaves, canker and dieback on canes and trunks, twig wilting, and blossom necrosis. Pseudomonas syringae pv. actinidiae (Psa), which is the causal agent of kiwifruit bacterial canker, is divided into four biovars based on multilocus sequence analysis of different genes, additional PCR testing of pathogenic genes (argKtox cluster, cfl, and various effector genes), and biochemical and physiological characterization...
August 2017: Plant Pathology Journal
https://www.readbyqxmd.com/read/28811576/microclimatic-temperatures-increase-the-potential-for-vector-borne-disease-transmission-in-the-scandinavian-climate
#12
Najmul Haider, Carsten Kirkeby, Birgit Kristensen, Lene Jung Kjær, Jens Havskov Sørensen, Rene Bødker
We quantified the difference between the meteorological temperature recorded by the Danish Meteorological Institute (DMI) weather stations and the actual microclimatic temperatures at two or three different heights at six potential insect habitats. We then compared the impact of the hourly temperature on the extrinsic incubation period (EIP) of six pathogens. Finally, we developed a regression model, enabling us to predict the microclimatic temperatures of different habitats based on five standard meteorological parameters readily available from any meteorological institution...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811530/evidence-for-ice-ocean-albedo-feedback-in-the-arctic-ocean-shifting-to-a-seasonal-ice-zone
#13
Haruhiko Kashiwase, Kay I Ohshima, Sohey Nihashi, Hajo Eicken
Ice-albedo feedback due to the albedo contrast between water and ice is a major factor in seasonal sea ice retreat, and has received increasing attention with the Arctic Ocean shifting to a seasonal ice cover. However, quantitative evaluation of such feedbacks is still insufficient. Here we provide quantitative evidence that heat input through the open water fraction is the primary driver of seasonal and interannual variations in Arctic sea ice retreat. Analyses of satellite data (1979-2014) and a simplified ice-upper ocean coupled model reveal that divergent ice motion in the early melt season triggers large-scale feedback which subsequently amplifies summer sea ice anomalies...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811515/localization-of-photoperiod-responsive-circadian-oscillators-in-the-mouse-suprachiasmatic-nucleus
#14
Tomoko Yoshikawa, Natsuko F Inagaki, Seiji Takagi, Shigeru Kuroda, Miwako Yamasaki, Masahiko Watanabe, Sato Honma, Ken-Ichi Honma
The circadian pacemaker in the suprachiasmatic nucleus (SCN) yields photoperiodic response to transfer seasonal information to physiology and behavior. To identify the precise location involved in photoperiodic response in the SCN, we analyzed circadian Period1 and PERIOD2 rhythms in horizontally sectioned SCN of mice exposed to a long or short day. Statistical analyses of bioluminescence images with respective luciferase reporters on pixel level enabled us to identify the distinct localization of three oscillating regions; a large open-ring-shape region, the region at the posterior end and a sharply demarcated oval region at the center of the SCN...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811214/semi-empirical-modeling-of-microalgae-photosynthesis-in-different-acclimation-states-application-to-n-gaditana
#15
Andrea Bernardi, Andreas Nikolaou, Andrea Meneghesso, Benoît Chachuat, Tomas Morosinotto, Fabrizio Bezzo
The development of mathematical models capable of accurate predictions of the photosynthetic productivity of microalgae under variable light conditions is paramount to the development of large-scale production systems. The process of photoacclimation is particularly important in outdoor cultivation systems, whereby seasonal variation of the light irradiance can greatly influence microalgae growth. This paper presents a dynamic model that captures the effect of photoacclimation on the photosynthetic production...
August 12, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28811197/seasonal-changes-in-plasma-testosterone-and-cortisol-suggest-an-androgen-mediated-regulation-of-the-pituitary-adrenal-axis-in-the-tarabul-s-gerbil-gerbillus-tarabuli-thomas-1902
#16
Yamina Zatra, Naouel Aknoun-Sail, Arezki Kheddache, Abdelouafi Benmouloud, Salima Charallah, Elara N Moudilou, Jean-Marie Exbrayat, Farida Khammar, Zaina Amirat
In the desert gerbil Gerbillus tarabuli (Thomas, 1902), cortisol is the main glucocorticosteroid produced by the adrenal glands. Plasma cortisol concentrations show highest values when testosterone is reduced and lowest values during the breeding season which occurs from early winter to late spring. In order to specify the implication of testicular androgens in these corticosteroid seasonal variations we investigated the effects induced by gonadectomy performed during the breeding season on the pituitary adrenal axis...
August 12, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28810872/-repel-all-biters-an-enhanced-collection-of-endophilic-anopheles-gambiae-and-anopheles-arabiensis-in-cdc-light-traps-from-the-kagera-region-of-tanzania-in-the-presence-of-a-combination-mosquito-net-impregnated-with-piperonyl-butoxide-and-permethrin
#17
Corey LeClair, Judith Cronery, Enock Kessy, Elsa V E Tomás, Yohannes Kulwa, Franklin W Mosha, Mark Rowland, Natacha Protopopoff, J Derek Charlwood
BACKGROUND: Mosquito nets containing synergists designed to overcome metabolic resistance mechanisms in vectors have been developed. These may enhance excitability in the mosquitoes and affect how they respond to CDC light-traps. Investigating the behaviour of vectors of disease in relation to novel mosquito nets is, therefore, essential for the design of sampling and surveillance systems. METHODS: In an initial experiment in Muleba, Tanzania, nine bedrooms from three housing clusters were sampled...
August 15, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28810707/seasonal-and-spatial-variations-of-prokaryoplankton-communities-in-a-salinity-influenced-watershed-china
#18
Anyi Hu, Hongjie Wang, Xiaoyang Yang, Liyuan Hou, Jiangwei Li, Shuang Li, Chang-Ping Yu
Prokaryotes represent the largest biodiversity pool and drive the biogeochemical cycles in fluvial environments. However, the mechanisms underlying the assembly of prokaryotic communities are largely unexplored at taxonomic and functional levels, simultaneously. Here, we investigated the spatio-seasonal distribution of prokaryoplankton communities in a salinity-influenced watershed, China using 16S rRNA gene amplicon sequencing. The OTUs were divided into core and satellite, based on a statistical approach...
August 1, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28810513/effects-of-source-and-seasonal-variations-of-natural-organic-matters-on-the-fate-and-transport-of-ceo2-nanoparticles-in-the-environment
#19
Zhen Li, Endalkachew Sahle-Demessie, Ashraf Aly Hassan, Jonathan G Pressman, George A Sorial, Changseok Han
Natural organic matter (NOM) affects the stability and transport of nanoparticles (NPs) in natural waters by modifying their physiochemical properties. Source location, and seasonal variations, influence their molecular, physical and electrical charge properties. To understand the variations of NOM on the mobilization of NPs, large volumes of water were collected from the Ohio River (OR) over winter and summer seasons and dissolved NOMs were concentrated. The chemical and structural differences of these NOMs were compared with the Suwannee River humic acid (SRHA) SRHA using (1)H and (13)C nuclear magnetic resonance spectroscopy, and Fourier transforms infrared (FTIR) spectroscopy...
August 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28810507/landscape-determinants-of-spatio-temporal-patterns-of-aerosol-optical-depth-in-the-two-most-polluted-metropolitans-in-the-united-states
#20
Chenghao Wang, Chuyuan Wang, Soe W Myint, Zhi-Hua Wang
Elevated concentration of atmospheric aerosols during severe urban air pollution episodes necessitates a deep understanding of the underlying determinants for a sustainable urban environment. The 15-year (2001-2015) Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol optical depth (AOD) data for the Phoenix and Los Angeles Metropolitan Areas were applied to examine the spatio-temporal patterns and dynamics of urban aerosols. The strongly correlated temporal trends of AOD were observed due to the similar seasonal pattern of aerosol emissions and potential synoptic connections between two areas...
August 8, 2017: Science of the Total Environment
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