An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
... Greater Prairie Chickens started their range expansion from Wisconsin about 1900. They reached Sault Ste. Marie, Ontario, by 1925 and completed colonization of Manitoulin Island by 1945. In the fall of 1932, an irruption of Northern Sharp-tailed Grouse from the Hudson Bay Lowlands occurred. Residents of Manitoulin distinguished the two species and reported the presence of “square-tails” and “sharp ...
... The parasite load of brown hares (Lepus europaeus) is of great interest to hunting ground managers and veterinarians. We compared the prevalence and intensity of parasitic infections in 362 hares from Austria and the Czech Republic with respect to age and body weight. Samples of the entire gastrointestinal tract, liver and lungs were collected during autumn hunting events in 2007. The paras ...
... At present, about 50% of the young fruit trees is stored for more than one month in cold rooms between lifting in the nursery and planting in spring in the orchard with a maximum storage duration of 5-6 months. Storage of fruit trees requires the absence of ethylene in the storage room, as this gaseous plant growth regulator may induce damage to the trees during storage, which eventually may lead ...
asymmetry; autumn; climate; data collection; river deltas; rivers; spring; summer; temperature; urbanization; vegetation cover; winter; China; Yangtze River
Abstract:
... Changes in land use, especially urbanization, alter the biophysical properties of Earth’s surface, which in turn affects local climate and even contributes to global warming. The observation minus reanalysis (OMR) approach has been widely applied to isolate the signal of surface forcing from observed temperature changes (which reflect all the sources of climate forcings, including surface effects) ...
... Excessive heat affects the fertility of high production lactating cows, and reduced pregnancy rates (PR) are observed during summer and early fall. Embryo production programs are used to produce more calves from high genetic merit animals, but could it also increase fertility by bypassing all the negative variables affecting the embryo development before Day 7 (oocyte development, ovulation, ferti ...
... Differentiating between pregnancy and nonpregnancy noninvasively is difficult in species that experience pseudopregnancy, including polar bears (Ursus maritimus). These bears usually breed in the spring, undergo delayed implantation until late summer or early fall, and give birth in late fall. In other species, the placental protein transthyretin (TTR) has been shown to be essential for early feta ...
... The study deals with the accumulation peculiarities of the technogenic radionuclides ¹³⁷Cs and ⁶⁰Co in different fishes (roach Rutilus rutilus (L.), perch Perca fluviatilis L., and pike Esox lucius L.) of Lake Drūkšiai, utilized as a cooler of the Ignalina Nuclear Power Plant. The main regularities in the accumulation of these radionuclides were analyzed, values of ¹³⁷Cs and ⁶⁰Co activity concentr ...
... Iodine, selenium and iron are micronutrients essential for thyroid hormone synthesis causing their low plasma levels an additional risk of autoimmune thyroid diseases. A Portuguese TDS pilot study representative of diets in Portugal was carried out, since foods are the main natural sources of these micronutrients. Six hundred and twenty-four samples were collected based on local markets and later ...
... We investigated in the field the carbon (C) transfer between sugar maple (Acer saccharum) saplings and the spring ephemeral Erythronium americanum via the mycelium of arbuscular mycorrhizal (AM) fungi. Sugar maple saplings and E. americanum plants were planted together in pots placed in the ground of a maple forest in 1999. Ectomycorrhizal yellow birches (Betula alleghaniensis) were added as contr ...
... BACKGROUND AND AIMS: ¹⁵Nitrogen balances are useful tools to increase our understanding of soil N processes and the efficiency of plants in taking up animal urine-N. This study aimed to investigate the effect of forage type on the fate of autumn-applied urine-N (700 kg N ha⁻¹). METHODS: In a 17-month lysimeter study the recoveries of ¹⁵N in herbage, leachate, nitrous oxide, and soil + roots (at th ...
... KEY MESSAGE: Juveniles and canopy trees may not exhibit similar nitrogen acquisition responses to soil temperature change caused by variation in snow cover over winter. The use of ¹⁵N tracer is a powerful tool for tracking the effects of variation in soil frost on plant nitrogen acquisition. While the responses of juvenile trees to environmental change are often used to infer the responses of cano ...
... Whilst the effects of oestrogenic contaminants in the aquatic environment are well documented in fish, effects in invertebrate species has been subject to debate, possibly due to differences in experimental conditions (temperature, timing and duration of exposure) between studies. It has been suggested that molluscs are only susceptible to oestrogens in periods either following the main spawning o ...
Gymnodinium; Stephanodiscus; autumn; environmental monitoring; freshwater; microscopy; phytoplankton; quantitative polymerase chain reaction; rivers; spring; toxicity; water quality; winter; Korean Peninsula
Abstract:
... Biomonitoring of phytoplankton communities in freshwater ecosystems is imperative for efficient water quality management. In the present study, we present the seasonal diversity of phytoplankton from the non-reservoir area of the Han River (Korea), assessed using the 18S rRNA amplicon sequencing. Our results uncovered a considerably high eukaryotic diversity, which was predominantly represented by ...
Rasa Aragonesa; analysis of variance; autumn; blastocyst; corpus luteum; endometrium; epithelium; estrus; ewes; immunohistochemistry; laparotomy; melatonin; ovulation; progesterone; progesterone receptors; spring; staining; superovulation; viability; New Zealand
Abstract:
... Twenty-three Rasa Aragonesa aged ewes (average age: 10.3±0.3 years) were used to determine the effect of melatonin on ovulatory response, embryo production, and endometrial expression of progesterone receptors (PR) after superovulation. Ewes were treated (M, n=13) or not (control, C, n=10) with melatonin implants in March (Day 0, Northern Hemisphere autumn), and received intravaginal progestogen s ...
altitude; autumn; data collection; databases; homogenization; piedmont; quality control; remote sensing; solar radiation; spring; winter; Italy
Abstract:
... A new surface solar radiation database of 74 daily series is set up for the Piedmont region (northwest Italy) for the 1990–2016 period. All the series are subjected to a detailed quality control, homogenization and gap-filling procedure and are transformed into relative annual/seasonal anomaly series. Finally, a gridded version (0.5°×0.5°) of the database is generated. The resulting series show an ...
... Thysanoptera species were collected from Stellaria media in autumn, winter and spring in different biotopes, in Hungary. The total number of the sampled specimens was 5121. The most frequent species were (in order of frequency): Thrips tabaci, T. atratus, Frankliniella intonsa, Aptinothrips rufus, T. minutissimus, T. nigropilosus and Anaphothrips obscurus. The number of species as well as the ...
... Solution-state 1H NMR spectroscopy was applied to characterize the structural features of water- and alkaline-soluble organic matter (WSOM and ASOM, respectively) sequentially extracted from fine urban atmospheric aerosols collected over different seasons. The objectives of this study were twofold: (i) to compare the functional characteristics of fine aerosol WSOM and the yet unknown ASOM, and (ii ...
... Horseweed, also known as marestail, is a problematic weed for no-till soybean producers that can emerge from late summer through the following spring. Overwintering cover crops can reduce both the density and size of fall-emerged weeds such as horseweed and reduce further spring emergence, although typically cover crops do not provide complete control. Cover crops may be integrated with additional ...
2-methylisoborneol; Pseudanabaena; autumn; excretion; freshwater; genes; odors; phylogeny; rivers; sequence homology; temperature; water distribution; South Korea
Abstract:
... Outbreaks of 2-methylisoborneol (2-MIB) contamination in drinking water sources cause inconvenient odor issues in the water distribution system. In this study, microscopy-based isolation with physiological and molecular phylogenetic characterization were performed to investigate and characterize the 2-MIB odor producers that caused an odor problem in the freshwater system of the North Han River in ...
... Plant-climate interactions affect the edible crop composition, impacting flavor, nutrition, and overall consumer liking. In this study, principal components analysis was used to assess the macro- and micronutrient metal concentrations in pre-monsoon (spring), monsoon (summer), and post-monsoon (autumn) tea (Camelia sinensis (L.) Kuntze) from Yunnan Province, China in 2014–2016. Statistical differe ...
... An outbreak of cyclosporiasis in Ontario, Canada, was investigated in the fall of 2015. Thirty-five confirmed and 10 probable cases were linked to the investigation. Epidemiological and food safety evidence implicated fresh sugar snap peas imported from Guatemala as the source of the outbreak. We describe here the first documented cyclosporiasis outbreak in Canada involving the consumption of suga ...
Violeta Hansen; Anders Mosbech; Jens Søgaard-Hansen; Frank Farsø Rigét; Flemming Ravn Merkel; Jannie Fries Linnebjerg; Ralf Schulz; Jochen P. Zubrod; Igor Eulaers; Gert Asmund
... Naturally occurring radionuclides, in particular, polonium-210 (²¹⁰Po), have a greater contribution than anthropogenic radionuclides to the annual effective dose received by the general public due to consumption of seafood. Knowledge of potential trophic sources and transfer of ²¹⁰Po to seabird species and subsequently to the Greenlandic people is, however, still poor. Here, we assess the transfer ...
... Lead-210 and ²¹⁰Po have been widely used as tracers for quantifying particulate scavenging in the upper layer of the oceanic water column. In this study, we investigated the ²¹⁰Po/²¹⁰Pb disequilibrium in the water column of the PN section in the East China Sea (ECS) during autumn 2013. In most of the water column, a deficiency of ²¹⁰Po was observed with respect to its parent nuclide ²¹⁰Pb (i.e., a ...
Saif Uddin; Montaha Behbehani; Abdulnabi Al-Ghadban; Sufiya Sajid; W. Al-Zekri; Mohammad Ali; Sarah Al-Jutaili; Lamya Al-Musallam; Vanitha Vinod; Mohammad Al-Murad; Faiz Alam
... Copepods are the most abundant metazoans, forming a vital food chain link between the primary producers the phytoplankton and fish. This study presents baseline information on the concentration of ²¹⁰Po among calanoid copepods isolated from the Kuwait marine area. The concentration of ²¹⁰Po in six species of copepod, including Subeucalanus flemingeri, Parvocalanus crassirostis, Acartia pacifica, C ...
... Marine phytoplankton is a primary producer in the ocean that forms the base of the marine food web and supports the pelagic food chain. The two dominant groups of phytoplankton observed in northern Gulf waters are diatoms and dinoflagellates. The diatoms outnumber dinoflagellates in the Gulf waters. This study presents baseline information on the concentration of 210Po among selected phytoplankton ...
... The results of application of 2D finite element model SHYFEM to the Curonian lagoon (Baltic Sea) are considered. SHYFEM consist of a physical processes module and an eutrophication module EUTRO adapted for the SHYFEM code from well known modelling system WASP. The SHYFEM/EUTRO model calibration results were compared with the performance of various biogeochemical models analysed in other studies (1 ...
... Soil gas fluxes depend on soil gas concentrations and physical properties of a soil. Taking soil samples for physical analysis into the laboratory strongly modifies soil gas concentrations and also cuts roots that sustain the activity in the rhizosphere. Since microbial processes interact with gas concentrations in soil, we need to study gas transport and production in situ.We developed a method t ...
... : 1 The length of the hind limb of R. temporaria bears to the body length a linear relationship, which can be expressed by the equation y=ax+b. There is a change in the value of the constants a and b at a point which marks the onset of puberty in the female. 2 The weight of amphibians as deduced from mean group measurements of R. temporaria, T. cristatus, S. maculose, A. tigrinum, and R. esculenta ...
Baeolophus bicolor; autumn; breeding; migratory behavior; monitoring; spring; surveys; Massachusetts; New England region
Abstract:
... Using standardized mist-net captures collected over a 32-year period (1970––2001), we examined changes in the capture rates of passerines recorded in coastal Massachusetts during fall (78 species) and spring (72 species) migration. Capture rates of 45 species of fall migrants (58%%) declined significantly between early (1970––1985) and late (1986––2001) years of the study; 36 species of spring mig ...
autumn; climate; gases; heat transfer; models; nutrient availability; salinity; spring; statistical analysis; Fernando de Noronha
Abstract:
... The dynamic of the thermohaline structure of the upper ocean, which depends on ocean–atmosphere interactions, drives most near surface oceanic processes, including the control of gases and heat fluxes, and nutrient availability in the photic layer. The thermohaline structure of the southwestern tropical Atlantic (SWTA), a key region for diagnosing variation of the Atlantic Meridional Overturning C ...
air temperature; autumn; ecological succession; ecosystems; evaporation; floodplains; hydrodynamics; hydrologic models; lakes; mixing; solar radiation; spatial variation; spring; statistical analysis; summer; temperature profiles; temporal variation; thermal stability; water quality; water temperature; watersheds; winter; China
Abstract:
... Thermal regime and its response to meteorological and hydrological forcings play an important role in controlling water quality and ecosystem of lakes. Many large floodplain lakes are subjected to significant river-lake interactions and could benefit greatly from hydrodynamic modeling. The current work presents a first attempt to use a 3D hydrodynamic model and statistical methods to explore spati ...
... The semiarid SE fringe of the Iberian Peninsula is considered one of the most sensitive to extreme floods and droughts in the western Mediterranean area. The controlling climatic mechanisms are nevertheless difficult to predict and model. A combined documentary-sedimentary-instrumental 500 years comprehensive register of climatic data (rainfall and flooding) was collated for analysing the decadal ...
... The paper reports the main results of the EU project Millennium in the Mediterranean area over the last 500 years. It analyses a long series of temperature from Portugal, Spain, France, Italy and Greece. The series are obtained by combining indices from documentary sources from AD 1500 to the onset of regular instrumental observations. There is an ongoing discussion regarding the proper way of com ...
... This study investigated the radioactivity behavior of ⁷Be in surface soil, airborne and deposited dust along Alexandria region in Egypt. The results obtained were used to predict scavenging processes of ⁷Be from surface soil to infer soil erosion and land vulnerable to accelerated sea-level rise. The areal activity concentrations of ⁷Be in surface soil were investigated in 30 undisturbed sites and ...
... Previous studies have shown the negative or positive relationship between cloud droplet effective radius (re) and aerosol amount based on limited observations, indicative of the uncertainties of this relationship caused by many factors. Using 8-year ground-based cloud and aerosol observations at Southern Great Plain (SGP) site in Oklahoma, US, we here analyze the seasonal variation of aerosol effe ...
... In seasonal breeders, reproductive seasonality can have a substantial influence on the efficiency of assisted reproductive technologies. This study assessed seasonal effects on cleavage and blastocyst rates, as well as on quality of invitro-produced (IVP) goat embryos over 18 months. In total, 2348 (autumn: 811, spring: 404, summer: 639, and, winter: 494) cumulus–oocyte complexes (COC) were recove ...
Sapium; autumn; botany; color; geographical distribution; habitats; history; plant cultural practices; shrubs; taxon descriptions; trees
Abstract:
... Neoshirakia japonica, (formerly known as Sapium japonicum and Shirakia japonica) is one of two species in the genus, both hardy trees in tribe Hippomaneae of the Euphorbiaceae. In this article the taxonomic history, distribution, habitat and cultivation of the species are discussed, accompanied by a detailed description and a colour plate by Christine Battle. ...
... Summer heat stress in dairy cows impairs the developmental competence of oocytes from antral follicles (2–8mm) which are used in conventional IVM and IVF systems. Moreover, summer heat stress is considered to impair the oocyte competence derived from smaller follicles; therefore, the impairment of oocyte competence possibly continues into the cooler autumn season. To investigate the thermosensitiv ...
... Previously unpublished data from 1958 to 1967 attest the occurrence of Babesia divergens in cattle in several endemic foci of Northeast Hungary. During that period the number of clinical cases showed fluctuation with intervals of 4-5 years and monophasic seasonality (peaking in June). In order to assess the current status of bovine babesiosis in that region, blood samples were collected fro ...
... Recently indoor air quality (IAQ) has become a key issue, especially in schools, where children spend most of the day. Only in a few cases IAQ was investigated using lichens as biomonitors. During autumn 2017, lichens (Evernia prunastri) were exposed for two months indoors and outdoors in public (schools) and private (dwellings) environments, in both rural and urban areas of Slovakia. The bioaccum ...
... Tomato spotted wild virus (TSWV) has become an important plant pathogen during the past 10 years in Hungary. This virus belongs to the family of Bunyaviridae, genus Tospovirus. According to the latest studies, this virus has about 1090 host plant species, including crops and weeds. In the autumn of 2009, some Aristolochia clematitis plants were collected showing symptom ...
Asterionella formosa; autumn; climate; cold; ice; lakes; limnology; seasonal variation; spring; statistical analysis; summer; temperature profiles; winter; China
Abstract:
... Past environmental changes based on diatom relative abundances have been inferred from the maar Lake Erlongwan in northeast China. The limnology of Lake Erlongwan is affected by the strongly seasonal regional climate. The composition of diatom assemblages, in turn, responds to changes in the seasonal duration of ice cover in winter, water-column turnover in spring and autumn, and thermal stratific ...
... Listeria monocytogenes is a foodborne pathogen frequently isolated from raw pork meat. This study was designed to investigate the prevalence and molecular characteristics of L. monocytogenes in raw pork from open markets in China. The survey was conducted monthly over a 12-month period in Zigong, China. L. monocytogenes was isolated from 262 of 1641 samples collected (16.0%) including minced meat ...
... Based on a 20-year (1991–2010) simulation of dust aerosol deposition with the global climate model CAM5.1 (Community Atmosphere Model, version 5.1), the spatial and temporal variations of dust aerosol deposition were analyzed using climate statistical methods. The results indicated that the annual amount of global dust aerosol deposition was approximately 1161±31Mt, with a decreasing trend, and it ...
Tridacna gigas; autumn; climate; palaeogeography; paleoclimatology; paleoecology; rain; shell (molluscs); solar radiation; surface water temperature; troposphere; winter; South China Sea
Abstract:
... Tridacna spp. usually have annual and even daily growth bands, and thus provide great potential to be the high-resolution recorders of past climate and environmental changes of the ocean. However, current studies mainly focus on the geochemical records of Tridacna shells, the environmental and climatic implications of long time sequenced daily growth increments are relatively unexplored. In this s ...
... Continuous high frequency in situ observations of hydrogen have been made at the Mace Head atmospheric research station on the Atlantic Ocean coastline of Ireland from April 1994 through to December 2017. These 40-minute observations represent one of the most comprehensive records of this trace gas carried out anywhere in the world. Hydrogen mixing ratios in northern hemisphere baseline air masses ...
... A numerical model was developed to determine the year-round temperature distribution within liquid manure storages, which is relevant for modelling temperature-dependent greenhouse gas and ammonia emissions. The model considers net short and long-wave radiation, heat conduction through walls and floor, surface convective heat transfer, evaporative heat loss, and manure loading. The model was imple ...
Tetrastes bonasia; autumn; chicks; correlation; dust bathing; feathers; forests; males; rain; temperature; Central European region; Czech Republic
Abstract:
... The only long-term census of hazel grouse Bonasa bonasia in Central Europe was conducted during 1972-2004 on a 100-km² area of the Bohemian Forest, Šumava, Czech Republic. To obtain a density index in October, I recorded indirect signs of hazel grouse, such as dust bathing sites, feathers, droppings or tracks, and reactions to a whistle that imitates the male territorial song along fixed routes co ...
Tetrastes bonasia; autumn; chicks; dust; forests; males; rain; regression analysis; reproductive success; temperature; wildlife; Central European region; Czech Republic
Abstract:
... The only long‐term census of hazel grouse Bonasa bonasia in Central Europe was conducted during 1972‐2004 on a 100‐km² area of the Bohemian Forest, Šumava, Czech Republic. To obtain a density index in October, I recorded indirect signs of hazel grouse, such as dust bathing sites, feathers, droppings or tracks, and reactions to a whistle that imitates the male territorial song along fixed routes co ...
algorithms; autumn; decision support systems; meteorological data; remote sensing; satellites; snow; snowpack; spring; summer; winter; Eurasia; North America
Abstract:
... A long-term Northern Hemisphere (NH) daily 5-km snow cover extent (SCE) product (JASMES) was developed by the application of a consistent objective snow cover mapping algorithm to data from historical optical sensors on polar orbiting satellites from 1978 to 2015. A conventional decision tree algorithm with multiple threshold tests was employed to analyze radiances for the five spectral bands avai ...