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https://www.readbyqxmd.com/read/28747533/species-integrity-enhanced-by-a-predation-cost-to-hybrids-in-the-wild
#1
P Anders Nilsson, Kaj Hulthén, Ben B Chapman, Lars-Anders Hansson, Jakob Brodersen, Henrik Baktoft, Jerker Vinterstare, Christer Brönmark, Christian Skov
Species integrity can be challenged, and even eroded, if closely related species can hybridize and produce fertile offspring of comparable fitness to that of parental species. The maintenance of newly diverged or closely related species therefore hinges on the establishment and effectiveness of pre- and/or post-zygotic reproductive barriers. Ecological selection, including predation, is often presumed to contribute to reduced hybrid fitness, but field evidence for a predation cost to hybridization remains elusive...
July 2017: Biology Letters
https://www.readbyqxmd.com/read/28747475/daphniid-zooplankton-assemblage-shifts-in-response-to-eutrophication-and-metal-contamination-during-the-anthropocene
#2
Mary Alta Rogalski, Peter R Leavitt, David K Skelly
Human activities during the Anthropocene result in habitat degradation that has been associated with biodiversity loss and taxonomic homogenization of ecological communities. Here we estimated effects of eutrophication and heavy metal contamination, separately and in combination, in explaining zooplankton species composition during the past 125-145 years using analysis of daphniid diapausing egg banks from four lakes in the northeastern USA. We then examined how these community shifts influenced patterns of diversity and homogenization...
July 26, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28747004/the-stability-and-removal-of-water-dispersed-cdse-cds-core-shell-quantum-dots-from-water
#3
Xu Chen, Yong Sik Ok, Dinesh Mohan, Charles U Pittman, Xiaomin Dou
The increasingly wide use of semiconductor nanocrystals inevitably leads to their release into aquatic environment. The aggregation behaviors of 3-mercaptopropionic acid-capped CdSe/CdS core-shell quantum dots (MPA-QDs) under various water chemistry conditions were examined and their removal using Fe(3+) and Al(3+) coagulants was evaluated. Cationic species rather than concentrations affected the stability of MPA-QDs. Adding 2 mM Ca(2+) led to a much larger ζ-potential decrease and particle size increase than adding 150 mM K(+) at each tested solution pH...
July 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28746622/holocene-history-of-a-lake-filling-and-vegetation-dynamics-of-the-serra-sul-dos-caraj%C3%A3-s-southeast-amazonia
#4
José T F Guimarães, Prafulla K Sahoo, Pedro W M Souza-Filho, Mariana M J Costa DE Figueiredo, Luiza S Reis, Marcio S DA Silva, Tarcísio M Rodrigues
Down-core changes in sedimentary facies, elemental geochemistry, pollen, spore, δ13C, δ15N and radiocarbon records from a filled lake, named R4, of the Serra Sul dos Carajás were used to study the relationship between the paleomorphological and paleoecological processes and their significance for Holocene paleoclimatology of the southeast Amazonia. The sediment deposition of the R4 lake started around 9500 cal yr BP. Increase of detrital components from 9500 to 7000 cal yr BP suggests high weathering of surrounding catchment rocks and soils, and deposition into the lake basin under mudflows...
July 24, 2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/28745763/cobalt-schiff-base-complexes-for-electrocatalytic-hydrogen-generation
#5
Ryan J DiRisio, Jessica E Armstrong, Mariah A Frank, William R Lake, William R McNamara
Two cobalt(iii) complexes containing inexpensive Schiff-base ligands have been found to be active for proton reduction at low overpotentials. The dinitro and tetranitro derivatized Schiff-base complexes show catalytic activity at -0.96 V and -1.1 V vs. Fc(+)/Fc, respectively, resulting in overpotentials of 120 mV and 280 mV. Foot-of-the-wave analysis is used to examine the kinetic properties of these complexes, yielding a theoretical TOFmax of up to 4100 s(-1). Experimental TOFs of 7 s(-1)and 3 s(-1) are observed...
July 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28745537/spatial-genetic-structure-and-body-size-divergence-in-endangered-gymnogobius-isaza-in-ancient-lake-biwa
#6
Takefumi Nakazawa, Shang-Yin Vanson Liu, Yoichiro Sakai, Kiwako S Araki, Cheng-Han Tsai, Noboru Okuda
Gymnogobius isaza is a freshwater goby endemic to ancient Lake Biwa, the largest lake in Japan. The species is now listed as 'Critically Endangered' in the Red Data Book of Japan. Nevertheless, it remains subject to fishing without any specific management strategies. Previous studies using mitochondrial DNA markers showed that this fish species has two cryptic lineages. However, little is known about spatial genetic structure and ecological differences across the broad lakescape. In this study, we collected fish samples at nine locations along the lakeshore during the breeding season and tested for the presence of spatial heterogeneity in the lineage's composition while measuring body size as the most fundamental biological trait...
July 26, 2017: Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis
https://www.readbyqxmd.com/read/28744868/a-new-diminutive-genus-and-species-of-catfish-from-lake-tanganyika-siluriformes-clariidae
#7
J J Wright
The examination of material representing one of Lake Tanganyika's six previously recognized endemic catfish lineages, has revealed the presence of an additional genus of clariid, described here as Pseudotanganikallabes new genus. This genus is represented by a single species, Pseudotanganikallabes prognatha sp. nov., which is distinguished from all other clariids by its lack of an infraorbital series, the presence of multiple osseous connections between the swim bladder capsules and elements of the neurocranium, the absence of an ethmoid notch, the presence of a very large, egg-shaped occipital fontanelle and the extension of the lower lip beyond the margin of the upper jaw...
July 26, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28743164/decisions-to-attend-and-drink-at-party-events-the-effects-of-incentives-and-disincentives-and-lifetime-alcohol-and-antisocial-problems
#8
Peter R Finn, Kyle Gerst, Allison Lake, Tim Bogg
BACKGROUND: Alcohol use disorders are associated with patterns of impulsive/risky decision making on behavioral economic decision tasks, but little is known about the factors affecting drinking-related decisions. METHODS: The effects of incentives and disincentives to attend and drink at hypothetical alcohol-related party events as a function of lifetime (LT) alcohol and antisocial problems were examined in a sample of 434 young adults who varied widely in LT alcohol and antisocial problems...
July 25, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/28742981/increased-precipitation-accelerates-soil-organic-matter-turnover-associated-with-microbial-community-composition-in-topsoil-of-the-alpine-grassland-on-the-eastern-tibetan-plateau
#9
Conghai Han, Zongli Wang, Guicai Si, Tianzhu Lei, Yanli Yuan, Gengxin Zhang
Large quantities of carbon are stored in the alpine grassland of the Tibetan Plateau (TP), where is extremely sensitive to climate change. However, it remains unclear whether soil organic matter (SOM) in different layers responds to climate change analogously, and whether microbial communities play vital roles in SOM turnover of topsoil. In this study we measured and collected SOM turnover by <sup>14</sup>C method in the alpine grassland to test climatic effects on SOM turnover in soil profiles...
July 25, 2017: Canadian Journal of Microbiology
https://www.readbyqxmd.com/read/28742952/na%C3%A3-ve-simplicity-the-overlooked-piece-of-the-complexity-simplicity-paradigm
#10
Franklin W Schwartz, Ganming Liu, Pradeep Aggarwal, Cynthia M Schwartz
Concepts of simplicity and complexity in modeling have been explored in papers, editorials, and talks. The concept is not well understood because there are at least two flavors of simplicity. Modelers envision simplicity (i.e., elegant simplicity) as the sought-after goal in modeling, but naïve simplicity, which is the focus of this paper, is commonly unrecognized and dangerous. The problem is that naïve or simple ideas are often mistaken for settled science and come with the prospect of being more wrong than right...
July 25, 2017: Ground Water
https://www.readbyqxmd.com/read/28742066/a-comprehensive-data-set-of-lake-surface-water-temperature-over-the-tibetan-plateau-derived-from-modis-lst-products-2001-2015
#11
Wei Wan, Huan Li, Hongjie Xie, Yang Hong, Di Long, Limin Zhao, Zhongying Han, Yaokui Cui, Baojian Liu, Cunguang Wang, Wenting Yang
Lake surface water temperature (LSWT) is sensitive to long-term changes in thermal structure of lakes and regional air temperature. In the context of global climate change, recent studies showed a significant warming trend of LSWT based on investigating 291 lakes (71% are large lakes, ≥50 km(2) each) globally. However, further efforts are needed to examine variation in LSWT at finer regional spatial and temporal scales. The Tibetan Plateau (TP), known as 'the Roof of the World' and 'Asia's water towers', exerts large influences on and is sensitive to regional and even global climates...
July 25, 2017: Scientific Data
https://www.readbyqxmd.com/read/28742006/flavobacterium-soyangense-sp-nov-a-psychrotolerant-bacterium-isolated-from-an-oligotrophic-freshwater-lake
#12
Gi Gyun Nam, Yochan Joung, Miri Park, Suhyun Kim, Hyoung Tae Jeon, Jang-Cheon Cho
A bacterial strain, designated IMCC26223T, was isolated from an oligotrophic freshwater lake, Lake Soyang, Korea. Cells of strain IMCC26223T were Gram-staining negative, strictly aerobic, non-motile and short-rod-shaped. Growth occurred at pH 6-8 (optimum, pH 7.0), at 4-25 °C (optimum, 15 °C) and with 0-0.5 % (w/v) NaCl (optimum, 0 %). Phylogenetic analyses based on 16S rRNA gene sequences showed that strain IMCC26223T was identified as a member of the genus Flavobacterium and most closely related to Flavobacterium fluvii H7T (97...
July 26, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28740140/vulnerability-of-mixotrophic-algae-to-nutrient-pulses-and-uvr-in-an-oligotrophic-southern-and-northern-hemisphere-lake
#13
P Carrillo, J M Medina-Sánchez, M Villar-Argaiz, F J Bullejos, C Durán, M Bastidas-Navarro, M S Souza, E G Balseiro, B E Modenutti
Nutrient inputs and ultraviolet radiation (UVR) are global factors affecting the structure and functioning of aquatic ecosystems, particularly clear-water ecosystems. We performed experiments in two model lakes highly exposed to UVR fluxes in order to test the effect that future increases in mineral nutrients transported by dust aerosol might exert on primary producers depending on the likelihood of atmospheric inputs. Lake La Caldera (Northern Hemisphere) has been receiving recurrent dust inputs from the Sahara Desert while lake Los Cántaros (Southern Hemisphere) has been less affected by dust aerosol...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28738509/ambient-sediment-quality-conditions-in-minnesota-lakes-usa-effects-of-watershed-parameters-and-aquatic-health-implications
#14
Judy L Crane
Surficial sediments were collected from 50 randomly selected Minnesota lakes, plus four a priori reference lakes, in 2007. The lakes encompassed broad geographic coverage of the state and included a variety of major land uses in the surrounding watersheds. Sediment samples were analyzed for a suite of metals, metalloids, persistent organic pollutants, total organic carbon, and particle size fractions. In addition, a small fish survey was conducted to assess PBDEs in both whole fish and fish tissues. Sediment quality in this set of lakes ranged from good (43%) to moderate (57%) based on an integrative measure of multiple contaminants...
July 18, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28738303/bio-accumulation-of-lanthanum-from-lanthanum-modified-bentonite-treatments-in-lake-restoration
#15
G Waajen, F van Oosterhout, M Lürling
Lanthanum (La) modified bentonite (LMB) is one of the available mitigating agents used for the reduction of the phosphorus (P) recycling in eutrophic lakes. The potential toxicity of the La from LMB to aquatic organisms is a matter of concern. In this study the accumulation of La was investigated in the macrophyte Elodea nuttallii, in chironomid larvae and in several fish species during periods up to five years following in situ LMB applications. The application of LMB increased the La concentration of exposed plants and animals...
July 21, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28738252/radioactivity-analysis-of-soil-samples-taken-from-the-western-and-northern-shores-of-lake-van-turkey
#16
Halime Kayakökü, Mahmut Doğru
In this study, concentrations of the radioactive isotopes (226)Ra, (232)Th, (40)K and (137)Cs were measured in soil samples from the shores of Lake Van using a high purity germanium detector. Activity concentrations obtained for these nuclides were compared with world average values. The average (226)Ra, (232)Th and (4)(0)K activity concentrations calculated for the soil samples were higher than the world average values reported by UNSCEAR. The lowest (226)Ra, (232)Th and (4)(0)K activity concentrations were recorded in sample T-1 whereas the highest values were recorded in sample T-11...
July 12, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28738203/early-detection-monitoring-for-aquatic-non-indigenous-species-optimizing-surveillance-incorporating-advanced-technologies-and%C3%A2-identifying-research-needs
#17
REVIEW
Anett S Trebitz, Joel C Hoffman, John A Darling, Erik M Pilgrim, John R Kelly, Emily A Brown, W Lindsay Chadderton, Scott P Egan, Erin K Grey, Syed A Hashsham, Katy E Klymus, Andrew R Mahon, Jeffrey L Ram, Martin T Schultz, Carol A Stepien, James C Schardt
Following decades of ecologic and economic impacts from a growing list of nonindigenous and invasive species, government and management entities are committing to systematic early- detection monitoring (EDM). This has reinvigorated investment in the science underpinning such monitoring, as well as the need to convey that science in practical terms to those tasked with EDM implementation. Using the context of nonindigenous species in the North American Great Lakes, this article summarizes the current scientific tools and knowledge - including limitations, research needs, and likely future developments - relevant to various aspects of planning and conducting comprehensive EDM...
July 21, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28738200/global-distribution-of-dissolved-organic-matter-along-the-aquatic-continuum-across-rivers-lakes-and-oceans
#18
Philippe Massicotte, Eero Asmala, Colin Stedmon, Stiig Markager
Based on an extensive literature survey containing more than 12,000 paired measurements of dissolved organic carbon (DOC) concentrations and absorption of chromophoric dissolved organic matter (CDOM) distributed over four continents and seven oceans, we described the global distribution and transformation of dissolved organic matter (DOM) along the aquatic continuum across rivers and lakes to oceans. A strong log-linear relationship (R(2)=0.92) between DOC concentration and CDOM absorption at 350nm was observed at a global scale, but was found to be ecosystem-dependent at local and regional scales...
July 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28737961/metacercaria-infection-status-of-fishborne-zoonotic-trematodes-except-for-clonorchis-sinensis-in-fish-from-the-heilongjiang-province-china
#19
Jian-Hua Qiu, Ying Zhang, Xiao-Xuan Zhang, Yuan Gao, Qi Li, Qiao-Cheng Chang, Chun-Ren Wang
To investigate the metacercarial infections of fishborne zoonotic trematodes (FZT), a total of 6815 freshwater fish (in representing 13 species of 5 families) were collected from Songhua river (n = 2636), Nenjiang river (n = 1935), Mudanjiang river (n = 301), and other lakes or ponds (n = 1943) in 36 representative regions in Heilongjiang Province, China, from August 2012 to December 2015. Metacercariae of four FZT species, that is, Clonorchis sinensis, Metorchis orientalis, Isthmiophora hortensis, and Metagonimus yokogawai, metacercariae were detected in the examination by the artificial digestion method...
July 24, 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/28737704/toxicity-at-the-edge-of-life-a-review-on-cyanobacterial-toxins-from-extreme-environments
#20
REVIEW
Samuel Cirés, María Cristina Casero, Antonio Quesada
Cyanotoxins are secondary metabolites produced by cyanobacteria, of varied chemical nature and toxic effects. Although cyanobacteria thrive in all kinds of ecosystems on Earth even under very harsh conditions, current knowledge on cyanotoxin distribution is almost restricted to freshwaters from temperate latitudes. In this review, we bring to the forefront the presence of cyanotoxins in extreme environments. Cyanotoxins have been reported especially in polar deserts (both from the Arctic and Antarctica) and alkaline lakes, but also in hot deserts, hypersaline environments, and hot springs...
July 24, 2017: Marine Drugs
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