journal
MENU ▼
Read by QxMD icon Read
search

Die Naturwissenschaften

journal
https://www.readbyqxmd.com/read/28540596/the-effect-of-growth-rate-and-ageing-on-colour-variation-of-european-pond-turtles
#1
Alejandro Ibáñez, José Martín, Alfonso Marzal, Albert Bertolero
Many chelonians have colourful dots, patches and stripes throughout their body that are made up, at least in part, of carotenoids. Therefore, turtles are very suitable models to study the evolution and functionality of carotenoid-based colouration. Recent studies suggested a close link between colouration and immune system in these taxa. However, more research is needed to understand the role of these colourful stripes and patches in turtle visual signalling. The purpose of this study was to explore the relationship between growth rate and colouration in European pond turtles...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28540595/social-media-and-scientific-research-are-complementary-youtube-and-shrikes-as-a-case-study
#2
Łukasz Dylewski, Peter Mikula, Piotr Tryjanowski, Federico Morelli, Reuven Yosef
Fascination with animals and their behaviour is one the most prominent patterns persisting in all human cultures. During the last decades, however, technological development and public access to the Internet have increased the speed and the extent of information sharing at an unprecedented rate, in some cases even challenging the traditional methods used in science. In order to understand the extent of this influence, we focused on the behaviour of shrikes. Shrikes are an enigmatic group of songbirds with a unique behaviour of impaling prey...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28534252/oxygen-isotope-fractionation-between-bird-bone-phosphate-and-drinking-water
#3
Romain Amiot, Delphine Angst, Serge Legendre, Eric Buffetaut, François Fourel, Jan Adolfssen, Aurore André, Ana Voica Bojar, Aurore Canoville, Abel Barral, Jean Goedert, Stanislaw Halas, Nao Kusuhashi, Ekaterina Pestchevitskaya, Kevin Rey, Aurélien Royer, Antônio Álamo Feitosa Saraiva, Bérengère Savary-Sismondini, Jean-Luc Siméon, Alexandra Touzeau, Zhonghe Zhou, Christophe Lécuyer
Oxygen isotope compositions of bone phosphate (δ(18)Op) were measured in broiler chickens reared in 21 farms worldwide characterized by contrasted latitudes and local climates. These sedentary birds were raised during an approximately 3 to 4-month period, and local precipitation was the ultimate source of their drinking water. This sampling strategy allowed the relationship to be determined between the bone phosphate δ(18)Op values (from 9.8 to 22.5‰ V-SMOW) and the local rainfall δ(18)Ow values estimated from nearby IAEA/WMO stations (from -16...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28497195/olfaction-in-a-viscous-environment-the-color-of-sexual-smells-in-temora-longicornis
#4
Peter Hinow, J Rudi Strickler, Jeannette Yen
We investigate chemical aspects of mating in the marine copepod Temora longicornis (Copepoda, Calanoidea). Our emphasis is the female pheromone signaling in form of well-defined trails for males to follow, observed in Doall et al. (Phil Trans R Soc Lond B 353:681-689, 1998). The viscous environment and the properties of the odorants play important roles as the spread of the pheromone trail limits the time during which it is useful for tracing. A key observation from our earlier work is the ability of a searching male to detect the direction of the female and to correct its swimming direction if necessary...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28477271/great-cormorants-phalacrocorax-carbo-can-detect-auditory-cues-while-diving
#5
Kirstin Anderson Hansen, Alyssa Maxwell, Ursula Siebert, Ole Næsbye Larsen, Magnus Wahlberg
In-air hearing in birds has been thoroughly investigated. Sound provides birds with auditory information for species and individual recognition from their complex vocalizations, as well as cues while foraging and for avoiding predators. Some 10% of existing species of birds obtain their food under the water surface. Whether some of these birds make use of acoustic cues while underwater is unknown. An interesting species in this respect is the great cormorant (Phalacrocorax carbo), being one of the most effective marine predators and relying on the aquatic environment for food year round...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28474181/sexual-selection-on-receptor-organ-traits-younger-females-attract-males-with-longer-antennae
#6
Tamara L Johnson, Matthew R E Symonds, Mark A Elgar
Sexual selection theory predicts that female choice may favour the evolution of elaborate male signals. Darwin also suggested that sexual selection can favour elaborate receiver structures in order to better detect sexual signals, an idea that has been largely ignored. We evaluated this unorthodox perspective by documenting the antennal lengths of male Uraba lugens Walker (Lepidoptera: Nolidae) moths that were attracted to experimentally manipulated emissions of female sex pheromone. Either one or two females were placed in field traps for the duration of their adult lives in order to create differences in the quantity of pheromone emissions from the traps...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28470450/responses-of-soil-n-fixing-bacteria-communities-to-invasive-plant-species-under-different-types-of-simulated-acid-deposition
#7
Congyan Wang, Jiawei Zhou, Kun Jiang, Jun Liu, Daolin Du
Biological invasions have incurred serious threats to native ecosystems in China, and soil N-fixing bacteria communities (SNB) may play a vital role in the successful plant invasion. Meanwhile, anthropogenic acid deposition is increasing in China, which may modify or upgrade the effects that invasive plant species can cause on SNB. We analyzed the structure and diversity of SNB by means of new generation sequencing technology in soils with different simulated acid deposition (SAD), i.e., different SO4(2-) to NO3(-) ratios, and where the invasive (Amaranthus retroflexus L...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28470449/is-phenotypic-plasticity-a-key-mechanism-for-responding-to-thermal-stress-in-ants
#8
Cristela Sánchez Oms, Xim Cerdá, Raphaël Boulay
Unlike natural selection, phenotypic plasticity allows organisms to respond quickly to changing environmental conditions. However, plasticity may not always be adaptive. In insects, body size and other morphological measurements have been shown to decrease as temperature increases. This relationship may lead to a physiological conflict in ants, where larger body size and longer legs often confer better thermal resistance. Here, we tested the effect of developmental temperature (20, 24, 28 or 32 °C) on adult thermal resistance in the thermophilic ant species Aphaenogaster senilis...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28444435/genetic-sex-determination-in-astatotilapia-calliptera-a-prototype-species-for-the-lake-malawi-cichlid-radiation
#9
Erin N Peterson, Maggie E Cline, Emily C Moore, Natalie B Roberts, Reade B Roberts
East African cichlids display extensive variation in sex determination systems. The species Astatotilapia calliptera is one of the few cichlids that reside both in Lake Malawi and in surrounding waterways. A. calliptera is of interest in evolutionary studies as a putative immediate outgroup species for the Lake Malawi species flock and possibly as a prototype ancestor-like species for the radiation. Here, we use linkage mapping to test association of sex in A. calliptera with loci that have been previously associated with genetic sex determination in East African cichlid species...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28396913/geographical-variation-in-sexual-behavior-and-body-traits-in-a-sex-role-reversed-wolf-spider
#10
Fedra Bollatti, Virginia Garcia Diaz, Alfredo V Peretti, Anita Aisenberg
Mating partners need to recognize, assess each other, and exchange information through behavioral events that occur before, during, and after mating. Sexual signals, as well as life history traits, are influenced by selective pressures and environmental factors that can vary across distant geographical areas. Allocosa senex is a sand-dwelling wolf spider which constructs burrows along the sandy coasts of Argentina, Brazil, and Uruguay. Females are the mobile sex that searches for males and initiates courtship...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28389678/sexual-differences-in-food-preferences-in-the-white-stork-an-experimental-study
#11
Zbigniew Kwieciński, Zuzanna M Rosin, Łukasz Dylewski, Piotr Skórka
Sex differences in the foraging ecology of monomorphic species are poorly understood, due to problems with gender identification in field studies. In the current study, we used experimental conditions to investigate the food preferences of the white stork Ciconia ciconia, an opportunistic species in terms of food, but characterised by a low level of sexual dimorphism. During a 10-day experiment, 29 individuals (20 females and 9 males) were studied by means of a 'cafeteria test' in which the storks' diet consisted of mammals, birds, fish, amphibians, insects and earthworms...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28382476/regulation-of-matrix-stiffness-on-the-epithelial-mesenchymal-transition-of-breast-cancer-cells-under-hypoxia-environment
#12
Yonggang Lv, Can Chen, Boyuan Zhao, Xiaomei Zhang
Substrate stiffness and hypoxia are associated with tumor development and progression, respectively. However, the synergy of them on the biological behavior of human breast cancer cell is still largely unknown. This study explored how substrate stiffness regulates the cell phenotype, viability, and epithelial-mesenchymal transition (EMT) of human breast cancer cells MCF-7 under hypoxia (1% O2). TRITC-phalloidin staining showed that MCF-7 cells transformed from round to irregular polygon with stiffness increase either in normoxia or hypoxia...
June 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28451735/acknowledgement-to-referees-2016
#13
(no author information available yet)
No abstract text is available yet for this article.
April 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28361348/controlling-enzymatic-activity-by-immobilization-on-graphene-oxide
#14
Paulina Bolibok, Marek Wiśniewski, Katarzyna Roszek, Artur P Terzyk
In this study, graphene oxide (GO) has been applied as a matrix for enzyme immobilization. The protein adsorption capacity of GO is much higher than of other large surface area carbonaceous materials. Its structure and physicochemical properties are reported beneficial also for enzymatic activity modifications. The experimental proof was done here that GO-based biocatalytic systems with immobilized catalase are modifiable in terms of catalyzed reaction kinetic constants. It was found that activity and stability of catalase, considered here as model enzyme, closely depend on enzyme/GO ratio...
April 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28361347/testing-the-influence-of-gravity-on-flower-symmetry-in-five-saxifraga-species
#15
Sebastian Koethe, Judith Bloemer, Klaus Lunau
Flower symmetry is considered a species-specific trait and is categorized in asymmetry, actinomorphic symmetry, bisymmetry and zygomorphic symmetry. Here we report on the intra-individual variation of flower symmetry in the genus Saxifraga and the influence of light, gravity and intrinsic factors on the development of flower symmetry. We tested five species-Saxifraga cuneifolia, Saxifraga imparilis, Saxifraga rotundifolia, Saxifraga stolonifera and Saxifraga umbrosa-concerning six flower parameters-angles between petals, petal length, petal pigmentation, angular position of carpels, movement of stamens and (only for S...
April 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28357478/application-of-environmental-dna-analysis-to-inform-invasive-fish-eradication-operations
#16
Phillip I Davison, Gordon H Copp, Véronique Créach, Lorenzo Vilizzi, J R Britton
Environmental DNA (eDNA) detection of non-native species has considerable potential to inform management decisions, including identifying the need for population control and/or eradication. An invasive species of European concern is the Asian cyprinid fish, topmouth gudgeon (Pseudorasbora parva). Here, eDNA analyses were applied at a commercial angling venue in southern England to inform operations aiming to eradicate P. parva, which had only ever been observed in one of the venue's seven unconnected angling ponds...
April 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28353195/intrinsic-worker-mortality-depends-on-behavioral-caste-and-the-queens-presence-in-a-social-insect
#17
Philip Kohlmeier, Matteo Antoine Negroni, Marion Kever, Stefanie Emmling, Heike Stypa, Barbara Feldmeyer, Susanne Foitzik
According to the classic life history theory, selection for longevity depends on age-dependant extrinsic mortality and fecundity. In social insects, the common life history trade-off between fecundity and longevity appears to be reversed, as the most fecund individual, the queen, often exceeds workers in lifespan several fold. But does fecundity directly affect intrinsic mortality also in social insect workers? And what is the effect of task on worker mortality? Here, we studied how social environment and behavioral caste affect intrinsic mortality of ant workers...
April 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28341961/from-smooth-to-rough-from-water-to-air-the-intertidal-habitat-of-northern-clingfish-gobiesox-maeandricus
#18
Petra Ditsche, Madeline Hicks, Lisa Truong, Christina Linkem, Adam Summers
The Northern clingfish is a small, Eastern North Pacific fish that can attach to rough, fouled rocks in the intertidal. Their ability to attach to surfaces has been measured previously in the laboratory, and in this study, we show the roughness and fouling of the natural habitat of these fish. We introduce a new method for measuring surface roughness of natural substrates with time-limited accessibility. We expect this method to be broadly applicable in studies of animal/substrate surface interactions in habitats difficult to characterize...
April 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28324174/combining-climatic-and-soil-properties-better-predicts-covers-of-brazilian-biomes
#19
Daniel M Arruda, Elpídio I Fernandes-Filho, Ricardo R C Solar, Carlos E G R Schaefer
Several techniques have been used to model the area covered by biomes or species. However, most models allow little freedom of choice of response variables and are conditioned to the use of climate predictors. This major restriction of the models has generated distributions of low accuracy or inconsistent with the actual cover. Our objective was to characterize the environmental space of the most representative biomes of Brazil and predict their cover, using climate and soil-related predictors. As sample units, we used 500 cells of 100 km(2) for ten biomes, derived from the official vegetation map of Brazil (IBGE 2004)...
April 2017: Die Naturwissenschaften
https://www.readbyqxmd.com/read/28299419/insights-into-the-role-of-age-and-social-interactions-on-the-sexual-attractiveness-of-queens-in-an-eusocial-bee-melipona-flavolineata-apidae-meliponini
#20
Jamille Costa Veiga, Cristiano Menezes, Felipe Andrés León Contrera
The attraction of sexual partners is a vital necessity among insects, and it involves conflict of interests and complex communication systems among male and female. In this study, we investigated the developing of sexual attractiveness in virgin queens (i.e., gynes) of Melipona flavolineata, an eusocial stingless bee. We followed the development of sexual attractiveness in 64 gynes, belonging to seven age classes (0, 3, 6, 9, 15, 18 days post-emergence), and we also evaluated the effect of different social interactions (such as competition between queens and interactions with workers) on the development of attractiveness in other 60 gynes...
April 2017: Die Naturwissenschaften
journal
journal
24099
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"