The diet of the Southern rockhopper penguin Eudyptes chrysocome chrysocome at Beauchene Island, Falkland Islands

first_imgThe diet of the Southern rockhopper penguin at Beauchene Island, Falkland Islands, was studied in the early chick‐rearing period by quantitative analysis of adult stomach contents. Juvenile squid (Teuthowenia sp.) comprised on average 21% by numbers (c. 1000 per sample) and 53% by weight; crustaceans contributed 79% by numbers (c. 4000 per sample) but only 45% by weight, and fish 2% by weight. Of the crustaceans only the euphausids Euphausia lucens (66% by numbers), E. vallentini (19%) and Thysanoessa gregaria (15%) were present in significant quantities, and all are swarming species characteristic of the Patagonian shelf epipelagic zooplankton. Comparison is made with the limited dietary data available from other studies, and rockhopper penguins are suggested typically to feed opportunistically on swarming or shoaling zooplankton (particularly euphausids and young squid) and small fish. Whereas the average weight of the stomach contents was 220 g, the biomass of the individuals originally ingested was estimated to total 800 g; the c. 3000 kj this represents is consistent with the likely energy requirements of adults making daily foraging trips to rear small chicks.last_img read more

Validation of imaging Doppler interferometer winds using meteor radar

first_imgThere has been some debate over the years concerning the accuracy of mesospheric wind observations made using the imaging Doppler interferometer (IDI) technique. The high potential and increasing use of IDI wind data in joint studies with spaced-antenna MF and meteor radar systems make it important to quantify the IDI results. This paper presents a novel comparison of wind measurements between a dynasonde implementation of IDI and winds derived from an all-sky meteor radar system, a widely-accepted standard for such measurements. Both radars were located at the USU Bear Lake Observatory and operated almost continuously for a four-month period. The winds and tides derived from IDI were found to closely match those measured by meteor radar, not only during the day but also at night, and at all overlapping heights from 80–95 km.last_img

A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the morning sector ionosphere

first_imgDetermining reliable proxies for the ionospheric signature of the open-closed field line boundary (OCB) is crucial for making accurate ionospheric measurements of many magnetospheric processes (e.g. magnetic reconnection). This study compares the latitudes of Spectral Width Boundaries (SWBs), identified in the morning sector ionosphere using the Super Dual Auroral Radar Network (SuperDARN), with Particle Precipitation Boundaries (PPBs) determined using the low-altitude Defense Meteorological Satellite Program (DMSP) spacecraft, in order to determine whether the SWB represents a good proxy for the ionospheric projection of the OCB. The latitudes of SWBs and PPBs were identified using automated algorithms applied to 5 years (1997-2001) of data measured in the 00:00-12:00 Magnetic Local Time (MLT) range. A latitudinal difference was measured between each PPB and the nearest SWB within a ±10min Universal Time (UT) window and within a ±1h MLT window. The results show that the SWB represents a good proxy for the OCB close to midnight (~00:00-02:00 MLT) and noon (~08:00-12:00 MLT), but is located some distance (~2°-4°) equatorward of the OCB across much of the morning sector ionosphere (~02:00-08:00 MLT). On the basis of this and other studies we deduce that the SWB is correlated with the poleward boundary of auroral emissions in the Lyman-Birge-Hopfield “Long” (LBHL) UV emission range and hence, that spectral width is inversely correlated with the energy flux of precipitating electrons. We further conclude that the combination of two factors may explain the spatial distribution of spectral width values in the polar ionospheres. The small-scale structure of the convection electric field leads to an enhancement in spectral width in regions close to the OCB, whereas increases in ionospheric conductivity (relating to the level of incident electron energy flux) lead to a reduction in spectral width in regions just equatorward of the OCB.last_img read more

Modeling the propagation characteristics of chorus using CRRES suprathermal electron fluxes

first_imgIn the present paper, phase space density functions of the form f(v) = A N /v n are fitted to statistical distributions of suprathermal electron fluxes (E = 0.213–16.5 keV) from the CRRES satellite, parameterized by L-shell, Magnetic Local Time (MLT), and geomagnetic activity. The fitted distributions are used in conjunction with ray tracing to calculate the Landau damping rates of an ensemble of rays representing whistler-mode chorus waves. The modeled propagation characteristics are compared with observations of chorus wave power from the CRRES satellite, as a function of L-shell, MLT, and magnetic latitude, in various frequency bands, and under various geomagnetic conditions. It is shown that the model results are remarkably consistent with many aspects of the observed wave distributions, including frequency, L-shell, MLT, and latitudinal dependence. In addition, the MLT distribution of wave power becomes characteristically asymmetric during active geomagnetic conditions, with small propagation lengths on the nightside which increase with MLT and maximize on the dayside. This asymmetry is shown to be directly related to the dynamics of the Landau resonant suprathermal electrons which drift around the Earth whilst undergoing scattering and loss due to a variety of plasma waves. Consequently, the suprathermal electrons play an important role in radiation belt dynamics, by controlling the distribution of chorus, which in turn contributes to the acceleration and loss of relativistic electrons in the recovery phase of storms.last_img read more

Telomere length measurement by qPCR in birds is affected by storage method of blood samples

first_imgGiven the potential role of telomeres as biomarkers of individual health and ageing, there is an increasing interest in studying telomere dynamics in a wider range of taxa in the fields of ecology and evolutionary biology. Measuring telomere length across the lifespan in wild animal systems is essential for testing these hypotheses, and may be aided by archived blood samples collected as part of longitudinal field studies. However, sample collection, storage, and DNA extraction methods may influence telomere length measurement, and it may, therefore, be difficult to balance consistency in sampling protocol with making the most of available samples. We used two complementary approaches to examine the impacts of sample storage method on measurements of relative telomere length (RTL) by qPCR, particularly focusing on FTA (Flinders Technology Associates) cards as a long-term storage solution. We used blood samples from wandering albatrosses collected over 14 years and stored in three different ways (n = 179), and also blood samples from captive zebra finches (n = 30) that were each stored using three different methods. Sample storage method influenced RTL in both studies, and samples on FTA cards had significantly shorter RTL measurements. There was no significant correlation between RTL measured in zebra finch blood on FTA cards and the same samples stored either as frozen whole blood or as extracted DNA. These results highlight the importance of consistency of sampling protocol, particularly in the context of long-term field studies, and suggest that FTA cards should not be used as a long-term storage solution to measure RTL without validation.last_img read more

Simulated trends in ionosphere-thermosphere climate due to predicted main magnetic field changes from 2015 to 2065

first_imgThe strength and structure of the Earth’s magnetic field is gradually changing. During the next 50 years the dipole moment is predicted to decrease by ∼3.5%, with the South Atlantic Anomaly expanding, deepening, and continuing to move westward, while the magnetic dip poles move northwestward. We used simulations with the Thermosphere-Ionosphere-Electrodynamics General Circulation Model to study how predicted changes in the magnetic field will affect the climate of the thermosphere-ionosphere system from 2015 to 2065. The global mean neutral density in the thermosphere is expected to increase slightly, by up to 1% on average or up to 2% during geomagnetically disturbedconditions (Kp ≥ 4). This is due to an increase in Joule heating power, mainly in the Southern Hemisphere. Global mean changes in total electron content (TEC) range from −3% to +4%, depending on season and UT. However, regional changes can be much larger, up to about ±35% in the region of ∼45◦S to 45◦N and 110◦W to 0◦Wduring daytime. Changes in the vertical ⃗E × ⃗B drift are the most important driver of changes in TEC, although other plasma transport processes also play a role. A reduction in the low-latitude upward⃗E × ⃗B drift weakens the equatorial ionization anomaly in the longitude sector of ∼105–60◦W, manifesting itself as a local increase in electron density over Jicamarca (12.0◦S, 76.9◦W). The predicted increase in neutral density associated with main magnetic field changes is very small compared to observed trends and other trend drivers, but the predicted changes in TEC could make a significant contribution to observationally detectable trends.last_img read more

USU Men’s Basketball Announce Matchup Against Northern Iowa

first_img FacebookTwitterLinkedInEmailLOGAN, Utah – Utah State men’s basketball will host Northern Iowa on Wednesday, Nov. 28, as part of the Mountain West/Missouri Valley Conference Challenge. The game was announced by the Mountain West on Thursday morning.UNI finished the 2017-18 season with a 16-16 overall mark, including a 7-11 ledger in league play. The Panthers return 12 student-athletes with playing experience, including senior guard Wyatt Lohous, who finished third on the team in scoring a season ago with 9.3 points per game. Sophomore forward Tywhon Pickford was named to the Missouri Valley all-Freshman and all-Newcomer teams after leading the Panthers with 7.8 rebounds per game, including team bests of 188 offensive and 248 defensive rebounds during the year.Head coach Ben Jacobson will be entering his 13th season leading the UNI program, compiling 250 career victories, the most in school history.“It is an exciting time to have our first official game on the calendar,” head men’s basketball coach Craig Smith said. “Things are coming together and I can’t wait to get our season underway. The Missouri Valley Conference is a great league for basketball and Coach Jacobsen has been very successful for many years at UNI. It will be an exciting matchup for our players and for our fans.”The game will mark the first meeting between the two schools in program history. Utah State is 1-2 all-time in the Mountain West/Missouri Valley Challenge, posting a 69-68 victory at Missouri State during the 2015-16 season, followed by a 62-61 loss at home against Indiana State during the 2016-17 season and a 72-65 loss at Valparaiso last year.USU is among the second batch of games during the MW/MVC Challenge, as Nevada and Boise State will travel to Loyola Chicago and Drake, respectively, on Tuesday, Nov. 27. Colorado State will round out the first day of competition when the Rams host Southern Illinois, also on Nov. 27. Four other games will be played on Wednesday, Nov. 28, as Valparaiso will travel to UNLV, Indiana State to San José State, and Missouri State to Air Force. Wyoming will travel to Evansville on Nov. 28, rounding out competition for that day. The final games of the Challenge are set for Saturday, Dec. 1, as New Mexico will travel to Bradley, and San Diego State will travel to Illinois State.Utah State will be entering the first year of Smith’s tenure in 2018-19. The team will be led by junior guard Sam Merrill, who paced the Aggies last season with 16.3 points per game and team bests of 107 assists and 35 steals. Merrill finished second in the Mountain West after averaging 35.4 minutes per game and garnered all-Mountain West third team honors at the end of the season.Utah State men’s basketball news and information is available on Facebook (’sbasketball) and on Twitter (@Aggiehoops). Fans can also get USU men’s basketball highlights on YouTube ( Aggie fans can follow the Utah State athletic program on Twitter (@usuathletics), on Facebook ( or on Instagram (@usuathletics). Tags: Basketball/Northern Iowa/Utah State Aggies Written by May 3, 2018 /Sports News – Local USU Men’s Basketball Announce Matchup Against Northern Iowa Robert Lovelllast_img read more

Sophia Floersch, after terrible crash, looks forward to next F3 season

first_img Written by FacebookTwitterLinkedInEmailISAAC LAWRENCE/AFP/Getty Images(NEW YORK) — Sophia Floersch can’t wait to get back on the track.In an exclusive interview with ABC News’ Good Morning America, the German Formula Three driver recounted the moment she lost control of her car during the Macau Grand Prix in November, sending it flying over the barriers and into the photographer’s box at 170 mph.“I wasn’t really afraid because, for me, it was a normal crash,” Floersch said. “When I saw the video, I was quite shocked as well, because it looks horrible and, all the flying parts, it feels different in the car.”Days shy of her 18th birthday, Floersch lost control of her car as she was trying to pass Jehan Daruvala. She spun out of control and catapulted into Lisboa Bend, smashing into Sho Tsuboi’s car before flying into the photographer’s pit.Following the crash, doctors spent 11 hours surgically repairing Floersch’s fractured spine and removing a bone splinter jammed dangerously close to her spinal cord, threatening paralysis.Floersch admits the crash was the worst she’s ever had, but she said she’s not fazed by it. Actually, she added, it motivates her.“It doesn’t scare me at all because every race driver knows the risk,” she said. “I have one big crash now and nothing really bad happened. So it doesn’t scare me, no.”Floersch started her racing career karting when she was 4 years old, switching to race cars at 14. She admits she wasn’t happy the first time she tried it.“I was crying,” she added. But she grew to love it and learned to push back and fight in a male-dominated sport.“Most of the people think it’s a man’s world and a man’s sport — for sure, it’s still a man’s world, but it’s not a man’s sport,” Floersch said, sending a message to aspiring female race drivers to “keep doing what you love and believe in yourself, because as a girl it’s not always easiest, especially in karting. You need to learn to be self-confident and not believe in what everyone is saying.”Floersch already has secured her spot in the next F3 season. Depending on how quickly her back and neck bones heal, she hopes to begin training in February.“It was never a thought to not continue racing,” Floersch said. “I want to drive again.”Copyright © 2018, ABC Radio. All rights reserved. December 14, 2018 /Sports News – National Sophia Floersch, after terrible crash, looks forward to next F3 seasoncenter_img Beau Lundlast_img read more

Ex-NFL player killed in parking dispute with neighbor, police say

first_img Written by FacebookTwitterLinkedInEmailUniversity of Colorado Athletics(AURORA, Colo.) — A former NFL player was fatally shot over the weekend in a dispute with a neighbor over a parking space, according to police.Anthony “T.J.” Cunningham, a former defensive back for the Seattle Seahawks and an assistant principal at a high school in Aurora, Colorado, was allegedly shot by a neighbor on Sunday and taken to a local hospital, where he died the following day, according to the Arapahoe County Sheriff’s Office.Police charged his neighbor, 31-year-old Marcus Johnson, with first-degree murder on Monday, accusing him of shooting Cunningham multiple times in the head and chest.Witnesses said the two neighbors met at a high school in Aurora, located about 10 miles east of Denver, to settle an ongoing parking dispute, according to a probable cause affidavit.Cunningham’s brother told police he accompanied the former player to the school’s parking lot, where the two planned to “box it out,” according to the affidavit.The two men were walking towards each other when Johnson allegedly shot him three times, striking him in the head and chest, according to the document.Johnson called 911 to report the shooting and police said they found a handgun in his vehicle. Johnson said Cunningham was armed with a bottle when he pulled the trigger, but Cunningham’s brother said he didn’t have a weapon, according to the affidavit.Johnson was originally booked on attempted murder, but the charge was amended after the victim’s death. He was being held without bail and it’s unclear if he has retained an attorney.Cunningham, 46, played for the Seahawks during the 1996 season until injuries ended his NFL career, according to the team’s website. He also played wide receiver and defensive back at the University of Colorado.The university’s football team said he was a “tremendous part of the CU community” who “touched countless others” during his time there, according to a statement.“We were deeply shocked and saddened to learn of the death of T.J. Cunningham,” the Colorado Buffaloes said in a tweet on Monday. “He was a good family man and had a strong passion for working with young people.”Copyright © 2019, ABC Radio. All rights reserved. February 20, 2019 /Sports News – National Ex-NFL player killed in parking dispute with neighbor, police saycenter_img Beau Lundlast_img read more

ABC’s Robin Roberts honored at NBA Finals

first_imgJune 6, 2019 /Sports News – National ABC’s Robin Roberts honored at NBA Finals FacebookTwitterLinkedInEmailABC(OAKLAND, Calif.) — Good Morning America co-anchor Robin Roberts has known struggle in her life, but she has proven that it’s possible to persevere when one keeps faith. Her example is one that  has inspired many, and on Wednesday night at NBA Finals Game 3, Roberts was recognized as this year’s recipient of the Sager Strong Award. The honor, named for the late sports reporter Craig Sager, is awarded to a person “who has been a trailblazer while exemplifying courage, faith, compassion and grace.”Roberts expressed her thoughts about the honor during Wednesday’s pregame show. Watch the video below:Copyright © 2019, ABC Radio. All rights reserved. Written bycenter_img Beau Lundlast_img