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https://www.readbyqxmd.com/read/28728128/radionuclide-biokinetics-in-the-russian-sturgeon-and-phylogenetic-consistencies-with-cartilaginous-and-bony-marine-fishes
#1
Ross A Jeffree, Scott J Markich, Francois Oberhaensli, Jean-Louis Teyssie
The biokinetics of eight radionuclides ((241)Am, (109)Cd, (134)Cs, (75)Se, (54)Mn, (110m)Ag, (65)Zn, (60)Co) absorbed from the aquatic medium by juvenile Russian sturgeon (Acipenser gueldenstaedtii) were experimentally determined in fresh (0.42‰) and brackish (9.0‰) waters, of a similar salinity range to the Caspian Sea, and in conjunction with chemical speciation modelling. Uptake and loss rate constants were determined for each radionuclide for a 14 day exposure at each salinity and during 28 days of exposure to radionuclide-free conditions...
July 17, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28727423/seasonal-variation-of-terrigenous-pahs-along-the-marginal-seas-of-china-input-phase-partitioning-ocean-current-transport
#2
Miao-Lei Ya, Xin-Hong Wang, Yu-Ling Wu, Yong-Yu Li, Jing-Ming Yan, Chao Fang, Yan-Yan Zhao, Ran-Ran Qian, Xiao-Long Lin
To study the spatial distributions and seasonal differences of concentrations, source identification, and phase partitioning of polycyclic aromatic hydrocarbons (PAHs) in the surface water, intensive sampling was carried out along the marginal seas of China in four seasons. In the northern South China Sea (SCS), the highest PAH levels occurred in summer (July to August) and autumn (October to November). In the East China Sea (ECS) and the Yellow Sea, the highest occurred in summer (August) and winter (December)...
July 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28727261/more-than-meets-the-eye-the-barrier-effect-of-the-yangtze-river-outflow
#3
Gang Ni, Elizabeth Kern, Yun-Wei Dong, Qi Li, Joong-Ki Park
The Yangtze (Changjiang) River enters the East China Sea with huge annual freshwater and sediment deposits. This outflow, known as the Changjiang Diluted Water (CDW), causes striking ecological gradients that potentially shape coastal species' distribution and differentiation. The CDW has long been rendered as a marine biogeographic boundary separating cold-temperature and warm-water faunas, but it remains unclear whether and to what extent it acts as an intraspecific barrier. Here we synthesize published phylogeographic studies related to the CDW to address these issues...
July 20, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28727218/altered-sediment-biota-and-lagoon-habitat-carbonate-dynamics-due-to-sea-cucumber-bioturbation-in-a-high-pco2-environment
#4
Kennedy Wolfe, Francisco Vidal-Ramirez, Sophie Dove, Dione Deaker, Maria Byrne
The effects of global change on biological systems and functioning are already measureable, but how ecological interactions are being altered is poorly understood. Ecosystem resilience is strengthened by ecological functionality, which depends on trophic interactions between key species and resilience generated through biogenic buffering. Climate-driven alterations to coral reef metabolism, structural complexity and biodiversity are well documented, but the feedbacks between ocean change and trophic interactions of non-coral invertebrates are understudied...
July 20, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28727210/thermal-affinity-as-the-dominant-factor-changing-mediterranean-fish-abundances
#5
Or Givan, Dor Edelist, Oren Sonin, Jonathan Belmaker
Recent decades have seen profound changes in species abundance and community composition. In the marine environment, the major anthropogenic drivers of change comprise exploitation, invasion by non-indigenous species, and climate change. However, the magnitude of these stressors has been widely debated and we lack empirical estimates of their relative importance. In this study, we focused on Eastern Mediterranean, a region exposed to an invasion of species of Red Sea origin, extreme climate change, and high fishing pressure...
July 20, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28726839/satellite-snafu-masked-true-sea-level-rise-for-decades
#6
Jeff Tollefson
No abstract text is available yet for this article.
July 17, 2017: Nature
https://www.readbyqxmd.com/read/28726837/solve-antarctica-s-sea-ice-puzzle
#7
John Turner, Josefino Comiso
No abstract text is available yet for this article.
July 19, 2017: Nature
https://www.readbyqxmd.com/read/28726815/environment-a-journey-on-plastic-seas
#8
Richard Thompson
No abstract text is available yet for this article.
July 19, 2017: Nature
https://www.readbyqxmd.com/read/28726705/spatiotemporal-distribution-of-nitrogen-and-phosphorus-in-alpine-lakes-in-the-sanjiangyuan-region-of-the-tibetan-plateau
#9
Su-Jin Lu, Jian-Huan Si, Chuan-Ying Hou, Yu-Si Li, Meng-Meng Wang, Xiao-Xia Yan, Meng Xie, Jin-Xu Sun, Bai-Jie Chen, Shu-Sen Li
To provide a theoretical basis for alpine source lake protection, ten samples were taken from each lake annually from 2012 to 2015. Each year, the various species of nitrogen and phosphorus nutrients were measured. The average contents of nitrate nitrogen, ammonia nitrogen, nitrite nitrogen, total phosphorus, and total nitrogen in the four lakes are 0.195-0.0 mg/L, 0.038-0.143 mg/L, 0.004-0.168 mg/L, 0.006-0.740 mg/L, and 0.050-0.547 mg/L, respectively. The total phosphorus contents in Eling Lake, Longbao Lake and Sea Star were higher than Class I water quality standards, and the total nitrogen contents in Eling Lake, Sea Star and Zhaling Lake were higher than Class I water quality standards as well...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28725011/observed-trends-in-the-magnitude-and-persistence-of-monthly-temperature-variability
#10
Timothy M Lenton, Vasilis Dakos, Sebastian Bathiany, Marten Scheffer
Climate variability is critically important for nature and society, especially if it increases in amplitude and/or fluctuations become more persistent. However, the issues of whether climate variability is changing, and if so, whether this is due to anthropogenic forcing, are subjects of ongoing debate. Increases in the amplitude and persistence of temperature fluctuations have been detected in some regions, e.g. the North Pacific, but there is no agreed global signal. Here we systematically scan monthly surface temperature indices and spatial datasets to look for trends in variance and autocorrelation (persistence)...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724988/continental-shelves-as-potential-resource-of-rare-earth-elements
#11
Olivier Pourret, Johann Tuduri
The results of this study allow the reassessment of the rare earth elements (REE) external cycle. Indeed, the river input to the oceans has relatively flat REE patterns without cerium (Ce) anomalies, whereas oceanic REE patterns exhibit strong negative Ce anomalies and heavy REE enrichment. Indeed, the processes at the origin of seawater REE patterns are commonly thought to occur within the ocean masses themselves. However, the results from the present study illustrate that seawater-like REE patterns already occur in the truly dissolved pool of river input...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724896/unprecedented-drought-over-tropical-south-america-in-2016-significantly-under-predicted-by-tropical-sst
#12
Amir Erfanian, Guiling Wang, Lori Fomenko
Tropical and sub-tropical South America are highly susceptible to extreme droughts. Recent events include two droughts (2005 and 2010) exceeding the 100-year return value in the Amazon and recurrent extreme droughts in the Nordeste region, with profound eco-hydrological and socioeconomic impacts. In 2015-2016, both regions were hit by another drought. Here, we show that the severity of the 2015-2016 drought ("2016 drought" hereafter) is unprecedented based on multiple precipitation products (since 1900), satellite-derived data on terrestrial water storage (since 2002) and two vegetation indices (since 2004)...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724727/a-cross-scale-trophic-cascade-from-large-predatory-fish-to-algae-in-coastal-ecosystems
#13
S Donadi, Å N Austin, U Bergström, B K Eriksson, J P Hansen, P Jacobson, G Sundblad, M van Regteren, J S Eklöf
Trophic cascades occur in many ecosystems, but the factors regulating them are still elusive. We suggest that an overlooked factor is that trophic interactions (TIs) are often scale-dependent and possibly interact across spatial scales. To explore the role of spatial scale for trophic cascades, and particularly the occurrence of cross-scale interactions (CSIs), we collected and analysed food-web data from 139 stations across 32 bays in the Baltic Sea. We found evidence of a four-level trophic cascade linking TIs across two spatial scales: at bay scale, piscivores (perch and pike) controlled mesopredators (three-spined stickleback), which in turn negatively affected epifaunal grazers...
July 26, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28724705/apparent-changes-in-body-insulation-of-juvenile-king-penguins-suggest-an-energetic-challenge-during-their-early-life-at-sea
#14
Manfred R Enstipp, Charles-André Bost, Céline Le Bohec, Caroline Bost, Yvon Le Maho, Henri Weimerskirch, Yves Handrich
Little is known about the early life at sea of marine top predators, like deep-diving king penguins (Aptenodytes patagonicus), although this dispersal phase is probably a critical phase in their life. Apart from finding favourable foraging sites, they have to develop effective prey search patterns as well as physiological capacities that enable them to capture sufficient prey to meet their energetic needs. To investigate the ontogeny of their thermoregulatory responses at sea, we implanted 30 juvenile king penguins and 8 adult breeders with a small data logger that recorded pressure and subcutaneous temperature continuously for up to 2...
July 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28724249/occurrence-and-source-apportionment-of-atmospheric-halogenated-flame-retardants-in-lhasa-city-in-the-tibetan-plateau-china
#15
Wan-Li Ma, Wen-Long Li, Zi-Feng Zhang, Li-Yan Liu, Wei-Wei Song, Chun-Yan Huo, Yi-Xing Yuan, Yi-Fan Li
Active air samples were collected in Lhasa, one of the highest cities in the world (3650m above sea level) located in the Tibetan Plateau, and were analyzed for 38 halogenated flame retardants (HFRs), including polybrominated diphenyl ethers (PBDEs), non-PBDE brominated flame retardants (NBFRs) and dechlorane plus (DPs). The median concentrations of PBDEs, NBFRs and DPs were 40, 23 and 0.21pg/m(3), respectively. Correlation analysis indicated the common source and/or similar environmental behavior for several HFRs...
July 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28723935/responses-of-molluscan-communities-to-centuries-of-human-impact-in-the-northern-adriatic-sea
#16
Ivo Gallmetzer, Alexandra Haselmair, Adam Tomašových, Michael Stachowitsch, Martin Zuschin
In sediment cores spanning ~500 years of history in the Gulf of Trieste, down-core changes in molluscan community structure are characterized by marked shifts in species and functional composition. Between the 16th and 19th century, a strong heavy metal contamination of the sediments, most notably by Hg, together with the effects of natural climatic oscillations (increased sedimentation and organic enrichment) drive community changes. Since the early 20th century up to 2013, the combined impacts of cultural eutrophication, frequent hypoxic events and intensifying bottom trawling replace heavy metal contamination and climatic factors as the main drivers...
2017: PloS One
https://www.readbyqxmd.com/read/28722620/case-report-infectious-diseases-in-pilgrims-visiting-the-holy-land
#17
Orna Nitzan, Arnon Blum, Esther Marva, Adina Katz, Bat-Sheva Tzadok, Yaarit Nachum-Biala, Gad Baneth, Avi Peretz
Every year Christian pilgrims from around the world visit the holy sites located around the Sea of Galilee. Some become ill during their stay with infectious diseases that were acquired in their country of origin, and are hospitalized at Poriya Medical Center. They pose a diagnostic challenge due to language barriers, the rarity of these infections in Israel, and the fact that diagnostic tests are not readily available. All patient records from 2015 of Holy Land tourists hospitalized at Poriya Medical Center were screened for the diagnosis of imported zoonotic diseases that are not commonly diagnosed in Israel...
May 30, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28722541/nox-emission-calculations-for-bulk-carriers-by-using-engine-power-probabilities-as-weighting-factors
#18
Chih-Wen Cheng, Jian Hua, Daw-Shang Hwang
An important marine pollution issue identified by the International Maritime Organization is NOx emissions; however, the stipulated method for determining the NOx certification value does not reflect the actual high emission factors of slow-speed two-stroke diesel engines over long-term slow steaming. In this study, an accurate method is presented for calculating the NOx emission factors and total amount of NOx emissions by using the actual power probabilities of the diesel engines in four types of bulk carriers...
July 19, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28721613/comparative-toxicity-of-seven-rare-earth-elements-in-sea-urchin-early-life-stages
#19
Marco Trifuoggi, Giovanni Pagano, Marco Guida, Anna Palumbo, Antonietta Siciliano, Maria Gravina, Daniel M Lyons, Petra Burić, Maja Levak, Philippe J Thomas, Antonella Giarra, Rahime Oral
The widespread use of rare earth elements (REEs) in a number of technological applications raises unanswered questions related to REE-associated adverse effects. We have previously reported on the multiple impact of some REEs on the early life stages of the sea urchin Paracentrotus lividus. The present investigation was to evaluate REE toxicity to early life stages in two unrelated sea urchin species, Sphaerechinus granularis and Arbacia lixula. The comparative toxicities were tested of seven REEs, namely yttrium, lanthanum, cerium, neodymium, samarium, europium and gadolinium as chloride salts at concentrations ranging from 10(-7) to 10(-4) M...
July 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28720998/spontaneous-spinal-epidural-abscess-in-a-normoglycemic-diabetic-patient-keep-it-as-a-differential
#20
Avinash Kumar, Vishal Kumar, Sarvdeep S Dhatt, Hitesh Lal, Raj Bahadur
Spinal epidural abscess (SEA) is a rare and serious condition which can lead to permanent neurological deficit. Spontaneous SEA is even rarer condition with an incidence of less than 1 per 10,000 person-year. Being spontaneous, it has high chances of being misdiagnosed, more so when the risk factors are not clearly explainable for the condition. This is a case report of such a case in a middle aged normoglycemic recently diagnosed diabetic man with atypical presentation. The diagnosis was made after magnetic resonance imaging and confirmed after surgical intervention in form of spinal decompression and patient recovered after appropriate antibiotics...
April 2017: Journal of Clinical Orthopaedics and Trauma
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