keyword
MENU ▼
Read by QxMD icon Read
search

Penguin

keyword
https://www.readbyqxmd.com/read/29765656/the-rise-and-fall-of-an-ancient-ad%C3%A3-lie-penguin-supercolony-at-cape-adare-antarctica
#1
Steven D Emslie, Ashley McKenzie, William P Patterson
We report new discoveries and radiocarbon dates on active and abandoned Adélie penguin ( Pygoscelis adeliae ) colonies at Cape Adare, Antarctica. This colony, first established at approximately 2000 BP (calendar years before present, i.e. 1950), is currently the largest for this species with approximately 338 000 breeding pairs, most located on low-lying Ridley Beach. We hypothesize that this colony first formed after fast ice began blocking open-water access by breeding penguins to the Scott Coast in the southern Ross Sea during a cooling period also at approximately 2000 BP...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29762187/reliability-of-the-osstell-implant-stability-quotient-and-penguin-resonance-frequency-analysis-to-evaluate-implant-stability
#2
Gul Buyukguclu, Zeynep Ozkurt-Kayahan, Ender Kazazoglu
PURPOSE: To evaluate the reliability of the Osstell implant stability quotient (ISQ) and Penguin resonance frequency analysis (RFA) devices in measuring implant stability. MATERIALS AND METHODS: Forty implants were embedded in self-curing acrylic resin, soft-lining material, polyvinyl siloxane impression material, and polycarboxylate cement (n = 10). After the initial setting times were completed, the stability of each implant was measured with Osstell ISQ and Penguin RFA with 3 repeated measurements...
May 10, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29760110/variability-in-summer-surface-residence-time-within-a-west-antarctic-peninsula-biological-hotspot
#3
Josh T Kohut, Peter Winsor, Hank Statscewich, Matthew J Oliver, Erick Fredj, Nicole Couto, Kim Bernard, William Fraser
Palmer Deep canyon along the central West Antarctic Peninsula is known to have higher phytoplankton biomass than the surrounding non-canyon regions, but the circulation mechanisms that transport and locally concentrate phytoplankton and Antarctic krill, potentially increasing prey availability to upper-trophic-level predators such as penguins and cetaceans, are currently unknown. We deployed a three-site high-frequency radar network that provided hourly surface circulation maps over the Palmer Deep hotspot...
June 28, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/29725722/mercury-exposure-in-humboldt-spheniscus-humboldti-and-chinstrap-pygoscelis-antarcticus-penguins-throughout-the-chilean-coast-and-antarctica
#4
Rocío Álvarez-Varas, David Morales-Moraga, Daniel González-Acuña, Sebastián A Klarian, Juliana A Vianna
Penguins are reliable sentinels for environmental assessments of mercury (Hg) due to their longevity, abundance, high trophic level, and relatively small foraging areas. We analyzed Hg concentrations from blood and feathers of adult Humboldt penguins (Spheniscus humboldti) and feathers of chinstrap penguins (Pygoscelis antarcticus) from different reproductive colonies with variable degrees of urbanization and industrialization along the Chilean and Antarctic coasts. We evaluated Hg concentration differences between species, sexes (Humboldt penguins), and localities...
May 3, 2018: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29722905/influence-of-biological-factors-on-hematological-and-serum-biochemistry-values-in-captive-ad%C3%A3-lie-chinstrap-gentoo-and-macaroni-penguins-in-pingtung-taiwan
#5
Shih-Yu Chen, Yi-Lun Tsai, Suen-Chuain Lin, Yeong-Huey Wu, Ming-Huei Liao, Ching-Dong Chang, Tsung-Hsien Li, Hsiao-Kuang Ho
Hematology and serum biochemistry reference values are essential for health evaluation and disease diagnosis in penguins. However, there are currently no published physiological values for captive Adélie (Pygoscelis adeliae) and Chinstrap penguins (P. antarcticus), nor for wild or captive Macaroni penguins (Eudyptes chrysolophus). The present study is the first investigation regarding hematology and serum biochemistry reference values for captive Adélie, Gentoo (P. papua), Chinstrap, and Macaroni penguins in Asia...
May 3, 2018: Zoo Biology
https://www.readbyqxmd.com/read/29717229/dietary-divergence-is-associated-with-increased-intra-specific-competition-in-a-marine-predator
#6
Norman Ratcliffe, Stacey Adlard, Gabrielle Stowasser, Rona McGill
Optimal foraging theory predicts that when food is plentiful all individuals should take a small range of preferred prey types, but as competition increases less preferred prey will be included in the diet. This dietary switching may not be uniform among individuals, which produces discrete dietary clusters. We tested this hypothesis for gentoo penguins at Bird Island, South Georgia, using stable isotope analysis and biologging. Competition, in the form of the density of foraging dives, increased markedly from incubation to chick-rearing owing to increased foraging effort...
May 1, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29703132/genomic-insights-into-natural-selection-in-the-common-loon-gavia-immer-evidence-for-aquatic-adaptation
#7
Zach G Gayk, Diana Le Duc, Jeffrey Horn, Alec R Lindsay
BACKGROUND: The common loon (Gavia immer) is one of five species that comprise the avian order Gaviiformes. Loons are specialized divers, reaching depths up to 60 m while staying submerged for intervals up to three minutes. In this study we used comparative genomics to investigate the genetic basis of the common loon adaptations to its ecological niche. We used Illumina short read DNA sequence data from a female bird to produce a draft assembly of the common loon (Gavia immer) genome...
April 27, 2018: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/29686847/temporal-variation-in-trophic-relationships-among-three-congeneric-penguin-species-breeding-in-sympatry
#8
Arnaud Tarroux, Christian Lydersen, Philip N Trathan, Kit M Kovacs
Penguins are a monophyletic group in which many species are found breeding sympatrically, raising questions regarding how these species coexist successfully. Here, the isotopic niche of three sympatric pygoscelid penguin species was investigated at Powell Island, South Orkney Islands, during two breeding seasons (austral summers 2013-2014 and 2015-2016). Measurements of carbon (δ13 C) and nitrogen (δ15 N) stable isotope ratios were obtained from blood (adults) or feather (chicks) samples collected from Adélie Pygoscelis adeliae , chinstrap P...
April 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29684698/biophysical-characterization-of-aptenodytes-forsteri-cytochrome-p450-aromatase
#9
Francisco Zarate-Perez, Jesús B Velázquez-Fernández, Gareth K Jennings, Lisa S Shock, Charles E Lyons, John C Hackett
Cytochrome P450 19 (CYP19, aromatase) catalyzes the conversion of androgens to estrogens in a sequence of three reactions that each depend on NADPH and O2 . Aromatase is a phylogenetically-ancient enzyme and its breadth of expression in other species has highlighted distinct physiological functions. In songbirds, estrogen production is required for programming the neural circuits controlling song and in the determination of sex in fish and reptiles. This work describes the expression, purification, and biophysical characterization of Aptenodytes forsteri (Emperor penguin, af) aromatase...
April 7, 2018: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29666609/direct-and-indirect-effects-of-penguin-feces-on-microbiomes-in-antarctic-ornithogenic-soils
#10
Yudong Guo, Nengfei Wang, Gaoyang Li, Gabriela Rosas, Jiaye Zang, Yue Ma, Jie Liu, Wenbing Han, Huansheng Cao
Expansion of penguin activity in maritime Antarctica, under ice thaw, increases the chances of penguin feces affecting soil microbiomes. The detail of such effects begins to be revealed. By comparing soil geochemistry and microbiome composition inside (one site) and outside (three sites) of the rookery, we found significant effects of penguin feces on both. First, penguin feces change soil geochemistry, causing increased moisture content (MC) of ornithogenic soils and nutrients C, N, P, and Si in the rookery compared to non-rookery sites, but not pH...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29603671/penguin-colony-attendance-under-artificial-lights-for-ecotourism
#11
Airam Rodríguez, Ross Holmberg, Peter Dann, André Chiaradia
Wildlife watching is an emerging ecotourism activity around the world. In Australia and New Zealand, night viewing of little penguins attracts hundreds of thousands of visitors per year. As penguins start coming ashore after sunset, artificial lighting is essential to allow visitors to view them in the dark. This alteration of the nightscape warrants investigation for any potential effects of artificial lighting on penguin behavior. We experimentally tested how penguins respond to different light wavelengths (colors) and intensities to examine effects on the colony attendance behavior at two sites on Phillip Island, Australia...
March 30, 2018: Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology
https://www.readbyqxmd.com/read/29587210/variation-in-mercury-concentration-in-juvenile-magellanic-penguins-during-their-migration-path-along-the-southwest-atlantic-ocean
#12
Jailson F Moura, Davi C Tavares, Leila S Lemos, Victor Vilas-Bôas Silveira, Salvatore Siciliano, Rachel A Hauser-Davis
The vulnerability of seabirds related to their migratory dynamics is frequently linked to environmental problems along the migration path. In this context, Magellanic penguins (Sphenicus magellanicus) seem to be vulnerable to an extensive range of environmental disturbances during their northward migration along the Atlantic waters of South America, which include by catch, marine debris ingestion, overfishing and environmental contamination. In this study, we investigate mercury accumulation in muscle and hepatic tissues of juveniles penguins collected along the Brazilian coast during three migratory seasonal years (2006, 2008 and 2012) and three areas along a latitudinal gradient...
March 24, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29568703/curious-creatures-a-multi-taxa-investigation-of-responses-to-novelty-in-a-zoo-environment
#13
Belinda A Hall, Vicky Melfi, Alicia Burns, David M McGill, Rebecca E Doyle
The personality trait of curiosity has been shown to increase welfare in humans. If this positive welfare effect is also true for non-humans, animals with high levels of curiosity may be able to cope better with stressful situations than their conspecifics. Before discoveries can be made regarding the effect of curiosity on an animal's ability to cope in their environment, a way of measuring curiosity across species in different environments must be created to standardise testing. To determine the suitability of novel objects in testing curiosity, species from different evolutionary backgrounds with sufficient sample sizes were chosen...
2018: PeerJ
https://www.readbyqxmd.com/read/29561876/time-lapse-imagery-of-ad%C3%A3-lie-penguins-reveals-differential-winter-strategies-and-breeding-site-occupation
#14
Caitlin Black, Colin Southwell, Louise Emmerson, Daniel Lunn, Tom Hart
Polar seabirds adopt different over-wintering strategies to survive and build condition during the critical winter period. Penguin species either reside at the colony during the winter months or migrate long distances. Tracking studies and survey methods have revealed differences in winter migration routes among penguin species and colonies, dependent on both biotic and abiotic factors present. However, scan sampling methods are rarely used to reveal non-breeding behaviors during winter and little is known about presence at the colony site over this period...
2018: PloS One
https://www.readbyqxmd.com/read/29550451/the-fossilized-birth-death-model-for-the-analysis-of-stratigraphic-range-data-under-different-speciation-modes
#15
Tanja Stadler, Alexandra Gavryushkina, Rachel C M Warnock, Alexei J Drummond, Tracy A Heath
A birth-death-sampling model gives rise to phylogenetic trees with samples from the past and the present. Interpreting "birth" as branching speciation, "death" as extinction, and "sampling" as fossil preservation and recovery, this model - also referred to as the fossilized birth-death (FBD) model - gives rise to phylogenetic trees on extant and fossil samples. The model has been mathematically analyzed and successfully applied to a range of datasets on different taxonomic levels, such as penguins, plants, and insects...
March 14, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29545489/how-will-climate-change-affect-king-penguins
#16
(no author information available yet)
No abstract text is available yet for this article.
March 17, 2018: Veterinary Record
https://www.readbyqxmd.com/read/29532586/resonance-frequency-analysis-comparing-two-clinical-instruments
#17
William Becker, Philippe Hujoel, Burton E Becker
BACKGROUND: Numerous studies indicate implants placed immediately after extraction or with minimally invasive procedures have excellent long-term success and survival rates. There is general agreement that implants must be stable after implant placement. This study evaluated implant stability changes from the time of implant placement to second stage (prior to restoration). Resonance frequency analysis (RFA) was determined for two commercially available units (Osstell, Osstell USA, Columbia, MD and Penguin, Penguin Integration Diagnostics, Sweden)...
March 13, 2018: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/29531692/stable-isotopes-document-the-winter-foraging-ecology-of-king-penguins-and-highlight-connectivity-between-subantarctic-and-antarctic-ecosystems
#18
Yves Cherel, Charline Parenteau, Paco Bustamante, Charles-André Bost
The poorly known winter foraging ecology of the king penguin, a major Southern Ocean consumer, was investigated at the subantarctic Crozet Islands where the largest global population breeds. Blood δ13 C and δ15 N values were used as proxies of the birds' foraging habitat and diet, respectively, and circulating prolactin levels helped in determining the birds' reproductive status. Plasma prolactin concentrations showed that king penguin adults of unknown breeding status ( n  = 52) that were present at the colony in winter were in fact breeders and failed breeders, but were not non -breeders...
March 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29524263/structures-of-jacalin-related-lectin-ppl3-regulating-pearl-shell-biomineralization
#19
Setsu Nakae, Masafumi Shionyu, Tomohisa Ogawa, Tsuyoshi Shirai
The nacreous layer of pearl oysters is one of the major biominerals of commercial and industrial interest. Jacalin-related lectins, including PPL3 isoforms, are known to regulate biomineralization of the Pteria penguin pearl shell, although the molecular mechanisms are largely unknown. The PPL3 crystal structures were determined partly by utilizing microgravity environments for 3 isoforms, namely, PPL3A, PPL3B, and PPL3C. The structures revealed a tail-to-tail dimer structure established by forming a unique inter-subunit disulfide bond at C-termini...
June 2018: Proteins
https://www.readbyqxmd.com/read/29517029/penguin-colony-integrity-office-and-curiosity-s-arm
#20
(no author information available yet)
No abstract text is available yet for this article.
March 8, 2018: Nature
keyword
keyword
36842
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"