Oxygen Uptake by Cryptopygus antarcticus (Collembola) at South Georgia

first_imgDeterminations of oxygen uptake of size classes I, II, III and IV of the collembolan Cryptopygus antarcticus Willem at +5°, +10° and +20°C were made at South Georgia, sub-Antarctic. The relation of respiration rate to live weight was similar at the three temperatures. Oxygen uptake increased with temperature within the range examined ( Q10 varying from 1.58 to 2.63). Comparison of South Georgia and Signy Island (Antarctic) data for C. antarcticus showed similarities between respiration – weight and respiration – temperature curves especially for the +5° to +10°C temperature range. No significant difference in respiration rate was detected between sexes from both locations, but a difference in body size was observed both between sexes, and between sites. The South Georgian specimens were smaller, lighter in weight and appeared to be sexually mature at a smaller size than those at Signy Island. The similarity of metabolism and the body size difference of C. antarcticus in the two populations are discussed.last_img read more

Opisthoteuthis borealis: a new species of cirrate octopod from Greenland waters

first_imgA new species of cirrate octopod, Opisthoteuthis borealis sp. nov. is described from specimens caught at depths of 957–1321 m off the coast of Greenland. Opisthoteuthis borealis sp. nov. is the most northerly of the Atlantic species of the genus and can be distinguished from the other species by the form of the digestive gland and the arrangement of enlarged suckers on the arms of mature males.last_img

A large-scale numerical model for computing isochrone geometry

first_imgA finite-difference model for the calculation of radar layer geometries in large ice masses is presented. Balance velocities are used as coefficients in the age equation and in the heat equation. Solution of the heat equation allows prediction of sliding areas and computation of basal melt rates. Vertical distributions of velocity are parameterized using shape functions. These can be set uniformly, or allowed to vary in space according to the distribution of sliding. The vertical coordinate can either be uniformly distributed within the thickness of the ice, or be uniformly distributed within the flux. The finite-difference scheme results in a large set of linear equations. These are solved using a nested factorization preconditioned conjugate gradient scheme. The convergence properties of some other iteration solution schemes are studied. The output is computations of age and temperature assuming steady state, in large ice masses at high resolution. Age calculations are used to generate isochrones which show the best fit to observed layers. Comparisons with analytical solutions are made, and the influence of the order of the finite-difference approximation and the choice of vertical coordinate on solution accuracy is considered.last_img read more

Earth system sensitivity inferred from Pliocene modelling and data

first_imgQuantifying the equilibrium response of global temperatures to an increase in atmospheric carbon dioxide concentrations is one of the cornerstones of climate research. Components of the Earth’s climate system that vary over long timescales, such as ice sheets and vegetation, could have an important effect on this temperature sensitivity, but have often been neglected. Here we use a coupled atmosphere-ocean general circulation model to simulate the climate of the mid-Pliocene warm period (about three million years ago), and analyse the forcings and feedbacks that contributed to the relatively warm temperatures. Furthermore, we compare our simulation with proxy records of mid-Pliocene sea surface temperature. Taking these lines of evidence together, we estimate that the response of the Earth system to elevated atmospheric carbon dioxide concentrations is 30-50% greater than the response based on those fast-adjusting components of the climate system that are used traditionally to estimate climate sensitivity. We conclude that targets for the long-term stabilization of atmospheric greenhouse-gas concentrations aimed at preventing a dangerous human interference with the climate system should take into account this higher sensitivity of the Earth system.last_img read more

Vertical flow in the Southern Ocean estimated from individual moorings

first_imgIn this study, we demonstrate that oceanic vertical velocities can be estimated from individual mooring measurements, even for non-stationary flow. This result is obtained under three assumptions: i. weak diffusion (Péclet number ≫1), ii. weak friction (Reynolds number ≫1), and iii. small inertial terms (Rossby number ≪1). The theoretical framework is applied to a set of 4 moorings located in the Southern Ocean. For this site, the diagnosed vertical velocities are highly variable in time, their standard deviation being one-to-two orders of magnitude greater than their mean. We demonstrate that the time-averaged vertical velocities are largely induced by geostrophic flow, and can be estimated from the time-averaged density and horizontal velocities. This suggests that local time-mean vertical velocities are primarily forced by the time-mean ocean dynamics, rather than by e.g. transient eddies or internal waves. We also show that, in the context of these four moorings, the time-mean vertical flow is consistent with stratified Taylor column dynamics in the presence of a topographic obstacle.last_img read more

Do pelagic grazers benefit from sea ice? Insights from the Antarctic sea ice proxy IPSO 25

first_imgSea ice affects primary production in polar regions in multiple ways. It can dampen water column productivity by reducing light or nutrient supply, provide a habitat for ice algae and condition the marginal ice zone (MIZ) for phytoplankton blooms on its seasonal retreat. The relative importance of three different carbon sources (sea ice derived, sea ice conditioned, non-sea-ice associated) for the polar food web is not well understood, partly due to the lack of methods that enable their unambiguous distinction. Here we analysed two highly branched isoprenoid (HBI) biomarkers to trace sea-ice-derived and sea-ice-conditioned carbon in Antarctic krill (Euphausia superba) and relate their concentrations to the grazers’ body reserves, growth and recruitment. During our sampling in January–February 2003, the proxy for sea ice diatoms (a di-unsaturated HBI termed IPSO25, δ13C  =  −12.5 ± 3.3 ‰) occurred in open waters of the western Scotia Sea, where seasonal ice retreat was slow. In suspended matter from surface waters, IPSO25 was present at a few stations close to the ice edge, but in krill the marker was widespread. Even at stations that had been ice-free for several weeks, IPSO25 was found in krill stomachs, suggesting that they gathered the ice-derived algae from below the upper mixed layer. Peak abundances of the proxy for MIZ diatoms (a tri-unsaturated HBI termed HBI III, δ13C  =  −42.2 ± 2.4 ‰) occurred in regions of fast sea ice retreat and persistent salinity-driven stratification in the eastern Scotia Sea. Krill sampled in the area defined by the ice edge bloom likewise contained high amounts of HBI III. As indicators for the grazer’s performance we used the mass–length ratio, size of digestive gland and growth rate for krill, and recruitment for the biomass-dominant calanoid copepods Calanoides acutus and Calanus propinquus. These indices consistently point to blooms in the MIZ as an important feeding ground for pelagic grazers. Even though ice-conditioned blooms are of much shorter duration than blooms downstream of the permanently sea-ice-free South Georgia, they enabled fast growth and offspring development. Our study shows two rarely considered ways that pelagic grazers may benefit from sea ice: firstly, after their release from sea ice, suspended or sinking ice algae can supplement the grazers’ diet if phytoplankton concentrations are low. Secondly, conditioning effects of seasonal sea ice can promote pelagic primary production and therefore food availability in spring and summer.last_img read more

RSL Hosts Sporting KC In US Open Cup Match

first_imgJune 6, 2018 /Sports News – Local RSL Hosts Sporting KC In US Open Cup Match FacebookTwitterLinkedInEmail(Sandy, UT)  —  Real Salt Lake hosts Sporting Kansas City in a United States Open Cup match tonight at Rio Tinto Stadium.The winner will move on to the Round of 16.  Match time is set for 7:00 p.m.RSL will resume MLS play on Saturday when it visits the L.A. Galaxy.  Salt Lake is third in the Western Conference with 22 points. Written by Tags: MLS/Real Salt Lake/Soccer/United States Open Cup Robert Lovelllast_img

USU A-Club Expands Membership Opportunities For Former Student-Athlete Organization

first_img FacebookTwitterLinkedInEmailLOGAN, Utah-In a Friday report, the Utah State athletics A-club will now recognize all former student-athletes who contribute $50 or many to the philanthropic funds of Aggies Unlimited.These funds entail Aggies Unlimited, the Big Blue Scholarship Fund, the Merlin Olsen Fund, the Wayne Estes Fund, the Blue A Society, sport gift accounts, endowments and other philanthropic giving funds.Also, contributing to the A-Club fund is still an option and will assist in supporting the program’s operations.Previously, a contribution was required directly to the A-Club for membership.Additionally, former student-athletes, managers, athletic trainers, coaches and spirit squad members can contribute to the fund of their choice and qualify for A-Club membership.2016 USU graduate Sarah Landes, a former Aggies gymnast, will oversee A-Club operations and replaces Jimmy Moore, who retires after 30 years of service to the university. Tags: A-Club/Big Blue Scholarship Fund/Utah State Athletics Written by July 21, 2018 /Sports News – Local USU A-Club Expands Membership Opportunities For Former Student-Athlete Organization Brad Jameslast_img read more

Utes will play Northwestern on Dec. 31 in San Diego

first_imgDecember 2, 2018 /Sports News – Local Utes will play Northwestern on Dec. 31 in San Diego Tags: Holiday Bowl/Northwestern Wildcats/Utah Utes Football Written by FacebookTwitterLinkedInEmailSAN DIEGO—No. 17 Utah (9-4, 6-3 Pac-12) will play No. 22 Northwestern (8-5, 8-1 Big Ten) in the 41st-annual San Diego County Credit Union Holiday Bowl. The game will be played on Monday, Dec. 31 at 4 p.m. PT (5 p.m. MT) at SDCCU Stadium and will be televised on FS1.Utah, the Pac-12 South Division champion, and Northwestern, the Big Ten West Division champ, are both making their first appearance in the Holiday Bowl. The two teams have played twice in their history—1927 and 1981—splitting the series 1-1. Both games were played in Evanston with Utah’s victory coming in 1981.Under 14th year head coach Kyle Whittingham, Utah is 4-0 against the Big Ten (3-0 vs. Michigan and 1-0 vs. Indiana). Whittingham played in the first four Holiday Bowls (1978-81) as a linebacker for BYU and was the Defensive MVP of the 1981 game. In 2008, he was inducted into the Holiday Bowl Hall of Fame.“We are elated to be invited to the Holiday Bowl and to play an outstanding Northwestern team,” said Whittingham. “It is a testament to our players and also our great fan base that we were invited to play in this prestigious game. Our players are deserving to play in a bowl of this caliber and we are especially happy for our exceptional senior class. We look forward to playing in front of a big Utah crowd down in San Diego on December 31.”The Utes are playing in a bowl game for the 13th time under Whittingham. He has the best bowl win percentage in NCAA history (92%) and his 11 bowl wins (11-1) is tied for second among active coaches.Utah is 5-0 in bowl games in the Pac-12 era with wins over Georgia Tech, Colorado State, BYU, Indiana and West Virginia since 2011. See sidebar on this page for Utah’s bowl history. The Utes are 2-0 in College Football Playoff bowls, beating Pittsburgh in the 2005 Fiesta Bowl and Alabama in the 2009 Sugar Bowl. Robert Lovelllast_img read more

Prep Sports Roundup: 1/25

first_imgJUNCTION, Utah-Kelby Jessen’s 18 points led the Piute Thunderbirds to a 64-59 win over Water Canyon in Region 20 boys basketball action Friday. James Jeffs had 18 points in the loss for the Wildcats. FacebookTwitterLinkedInEmailBoys Basketball RICHFIELD, Utah-Payton Thompson amassed 18 points and Joshua Thalman added 17 more as the Richfield Wildcats humbled Emery 65-60 in Region 15 boys basketball action Friday. Cade Brazier had 23 points, including six 3-pointers in defeat for the Spartans. Monteverde Academy Invitational GUNNISON, Utah-Porter Wood led the way with 27 points as the Parowan Rams got past Gunnison 57-53 in Region 18 boys basketball action Friday. Jackson Hill’s 12 points led the Bulldogs in defeat. ROOSEVELT, Utah-Tori Ross netted 22 points and the Union Cougars got past Delta 56-52 Friday in Region 14 girls basketball action. Shaylee Fowles’ 22 points led the Rabbits in defeat. Region 20 Region 14 MONTEVERDE, Fla.-Richie Saunders had 12 points but it wasn’t enough as Rancho Christian smoked Saunders’ Wasatch Academy Tigers 74-47 Friday at the Monteverde (Fla.) Academy Invitational. SALINA, Utah-Burke Mickelsen netted 18 points and 6 rebounds but it wasn’t enough as the Beaver Beavers routed North Sevier 68-44 in Region 18 boys basketball action Friday. BICKNELL, Utah-Shudeen Begay’s 15 points paced Whitehorse as the Raiders edged Wayne 69-67 in overtime Friday in Region 19 girls basketball action. Hannah Morrill had 22 points for the Badgers in defeat. ROOSEVELT, Utah-Derek Smith posted 24 points and the Delta Rabbits pounded Union 71-27 Friday in Region 14 boys basketball action. Logan Gillman had 10 points for the loss in the Cougars. MILFORD, Utah-Preslee Barnson had 11 points for the Milford Tigers in a 54-5 rout of Dugway Friday in Region 21 girls basketball action. Paisley Smith had all five points in the loss for the Mustangs. Region 14 BICKNELL, Utah-Bridger Brian and Garrett Chappell each posted 16 points and the Wayne Badgers pounded Whitehorse 72-53 Friday in Region 19 boys basketball action. MOAB, Utah-Veda Gritts led the way with 15 points and the Grand Red Devils stymied North Sanpete 42-33 in Region 15 girls basketball action Friday. Graciee Christiansen had 11 points for the Hawks in the loss. Hayes Monroe added 12 points and 6 rebounds and Austin Burraston stepped up with 12 points on 4 of 5 shooting from range for the Eagles, who shot 53.8 percent for the game in improving to 5-13 on the season while Kanab fell to 12-5. Region 21 Girls Basketball By virtue of a commitment he made to his players should they win this evening, Eagles head coach Blaine Burraston allowed his wife to shave a mohawk into his hair after the game.center_img Brad James PANGUITCH, Utah-Treyson Roberts led the way with 26 points as the Bryce Valley Mustangs bested Panguitch 66-60 in Region 20 boys basketball action Friday. Kanyon Lamb led the Bobcats in the loss with 18 points. Region 21 Region 15 Region 19 FILLMORE, Utah-Kael Myers amassed 24 points and 6 rebounds on 9 of 14 shooting and Tyce Davies added 15 points on 6 of 8 shooting as the Millard Eagles upset Kanab 78-62 Friday in Region 18 boys basketball action. MILFORD, Utah-Kyler Wunderlich stepped up with 18 points and the Milford Tigers hammered Dugway 63-28 Friday in Region 21 boys basketball action. T.J. Ramos had 10 points to pace the Mustangs in defeat. Region 18 Blaine Burraston galvanized the crowd after the fact, saying that if the Eagles should win the 2-A state title, more shaving may occur. Region 15 Written by Region 19 Nathaniel “Hoss” Houston netted 24 points in the loss for the Cowboys. Millard put the game away for good with a 31-14 run in the 3rd Quarter. MT. PLEASANT, Utah-Chase Croasmun posted 25 points as the Grand Red Devils decimated North Sanpete 81-54 Friday in Region 15 boys basketball action. Scott Hatch had 10 points in the loss for the Hawks. ORDERVILLE, Utah-Gavin Hoyt posted 15 points and the Valley Buffaloes crushed Diamond Ranch 80-31 Friday in Region 20 boys basketball action. Tyler Nash’s 11 points led the Diamondbacks in defeat. Tags: High School Sports Roundup MANTI, Utah-Grady Thompson netted 32 points as the Manti Templars outgunned San Juan 77-73 in Region 15 boys basketball action Friday. Randall Flavel’s 15 points led the Broncos in defeat. January 26, 2019 /Sports News – Local Prep Sports Roundup: 1/25last_img read more