Rock moisture data from Livingston Island (maritime antarctic) and implications for weathering processes

Rock moisture data from Livingston Island (maritime antarctic) and implications for weathering processes

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first_imgRock moisture content was determined for rock samples on different aspects of rock outcrops on Livingston Island during a summer season. As a result of the dominant rainbearing northerly winds the southern aspect usually has rock moisture levels lower than the northern. The southern aspect, however, experiences high rock moisture levels during periods of snowmelt; snow accumulates on the southern, lee-side of the rock outcrops. Wetting and drying events are more frequent on the northern exposure, although not as common as at a site open through the full 360°, while the southern aspect tends to experience continuous, low moisture levels with infrequent dry events. Contrary to earlier suggestions, freeze–thaw weathering does not appear to be a major factor during the summer. Although rock moisture levels are conducive to freeze–thaw, rock temperatures rarely go below 0°C. Rather, it appears that weathering due to wetting and drying may be more common on the northern aspects than was previously thought while chemical weathering is active on southerly aspects. Rock moisture levels may support rock damage due to segregation ice during the winter freeze when the rate of freezing is slowed by the overlying snow cover.last_img read more

Distribution of foraging by female Antarctic fur seals

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first_imgThe study examined the distribution of critical habitat for foraging by female Antarctic fur seals breeding at the island of South Georgia. Bathymetric features of the continental shelf around the island of South Georgia were an important indicator for the localisation of foraging. This pattern was consistent among years of different prey availability. Lactating females were constrained to forage mainly within 100 km of the location at which the offspring was being raised. When this constraint was removed at the end of lactation, females foraged to much greater ranges and dispersed to specific regions of the continental shelf east of Patagonia (>1000 km) and to the northern edge of the Antarctic pack ice (500 km). The empirical distribution of foraging during the breeding season was used to develop a function that described the foraging distribution for the whole breeding population of females. The result was consistent with past observations from ship-based surveys and it allowed estimation of the spatial impact of breeding female fur seals on krill at South Georgia. This suggested that, in extreme cases and assuming that krill influx is limited, female fur seals could eat most of the krill present in some regions where they forage intensively. However, mean consumption was about one-tenth of the mean density of krill.last_img read more

Algophagus mites (Astigmata: Algophagidae) from the sub-Antarctic Prince Edward Islands: habitat-related morphology and taxonomic descriptions

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first_imgFive populations of habitat-specific, morphologically distinct Algophagus mites (Astigmata: Algophagidae) were found to occur on the sub-Antarctic Prince Edward islands. Although these mites did not differ among themselves with respect to idiosomal setal characteristics, which were also similar to those of known sub-Antarctic Algophagus taxa, morphometric analyses revealed leg and idiosomal size differences. In addition to morphometric differences, leg setal positions and porose axillary organ structure, indicated that the morphotypes were taxonomically discrete. The taxa were found to include the known A. antarcticus Hughes, 1955, A. laticollaris Fain, 1974 (new status), a sub-species of A. semicollaris Fain, 1974, and two new species, A. brachytarsus sp. nov. and A. macrolithus sp. nov. With the exception of A. semicollaris, the taxa are described or redescribed in this paper. Morphological features of the females in particular, and notably leg proportions, claw dimensions, and apodeme positions, corroborate discrete terrestrial (A. brachytarsus and A. macrolithus) and aquatic forms (A. antarcticus, A. laticollaris, and A. semicollaris), and vary in a manner suggesting a functional relationship to habitat occupation by the various taxa.last_img read more

An investigation of avoidance by Antarctic krill of RRS James Clark Ross using the Autosub-2 autonomous underwater vehicle

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first_imgThe autonomous underwater vehicle (AUV) Autosub-2 was deployed on eight missions ahead of RRS James Clark Ross in the northern Weddell Sea and in the Bransfield Strait, Southern Ocean, to assess avoidance of the research vessel by Antarctic krill Euphausia superba. The AUV was equipped with the same type of scientific echosounder as the research vessel (Simrad EK500 operating at 38 and 120 kHz) and measured the density of krill along transect acoustically (g m(-2) wet mass) prior to the ship’s arrival. We hypothesised that if krill avoided the ship, perhaps in response to radiated noise, then the ship should detect less krill than the AUV which is known to have much lower noise levels than the ship. We were unable to detect any significant difference between the density of krill detected by the ship or the AUV, either at the transect level or at finer scales within transects. We conclude, therefore, that avoidance by krill of RRS James Clark Ross will not significantly bias acoustic estimates of krill abundance by this vessel.last_img read more

Combined morphological and molecular analysis of individual nematodes through short-term preservation in formalin

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first_imgSmall metazoans such as marine nematodes are increasingly identified using both molecular and morphological techniques. Formalin is the preferred fixative for morphological analysis but specimens become unsuitable for molecular study due to formalin-induced modification of DNA. Nematodes fixed in ethanol work well for molecular studies but become unsuitable for taxonomy due to shrinkage. Here we show for the first time that formalin can be used as a short-term fixative (≤ 7 days) for marine nematodes, allowing both morphological and molecular work to be conducted on the same individual. No sequence ambiguities were detected in polymerase chain reaction (PCR) amplifications of 18S ribosomal DNA (rDNA) following short-term formalin preservation.last_img read more

Strong site-fidelity increases vulnerability of common bottlenose dolphins Tursiops truncatus in a mass tourism destination in the western Mediterranean Sea

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first_imgThe local population of common bottlenose dolphin in the Balearic Islands coastal waters, a mass tourism destination in the western Mediterranean subject to increasing anthropogenic pressures, was monitored over a three-year period. Photo-identification surveys provided a relatively small population estimate, even though the islands are considered to be a hotspot for the species in the Mediterranean. Dolphins showed strong site-fidelity and relatively limited mobility across the archipelago, which makes them highly dependent on waters which are severely affected by overfishing, habitat degradation and boat disturbance resulting from a continuously-growing tourism and shipping industry. Ecosystem-based management actions are urgently needed to ensure the conservation of this fragile population of bottlenose dolphins. Conservation measures should be developed within the already-existing political and legal marine biodiversity conservation framework and in collaboration with local authorities and stakeholders.last_img read more

Jackson’s 19 pts lead GCU past Utah Valley in WAC opener

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first_imgGrand Canyon (8-6) closed out the first half with a 12-4 run in the last 5½ minutes to lead 36-27 at the break. Connor MacDougall made a layup with 14:10 to go and Utah Valley came as close as 42-40 before Lever converted a 3-point play. McDougall added a pair of free throws later to reduce the Wolverines’ deficit to 49-48 but they’d never get closer. January 3, 2019 /Sports News – Local Jackson’s 19 pts lead GCU past Utah Valley in WAC opener Carlos Johnson added 10 points for the Lopes. Both teams struggled shooting from the field (each were 38 percent) but made up for it at the foul line; Utah Valley 15 of 16 and GCU 19 of 24. Written by Benjamin Nakwaasah scored 15 for Utah Valley (11-5) and Baylee Steele scored 12. FacebookTwitterLinkedInEmailPHOENIX (AP) — Matt Jackson scored 19 points and Alessandro Lever scored 14 and Grand Canyon beat Utah Valley 71-60 in a Western Athletic Conference opener for both teams Thursday night. Associated Presslast_img read more

Utah Baseball Ends Season on High Note With 5-1 Win Over UC Davis

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first_img Robert Lovell FacebookTwitterLinkedInEmailSALT LAKE CITY, Utah – Utah baseball closed out the season on a high note by beating UC Davis 5-1 and sweeping the two-game series at Smith’s Ballpark on Saturday, May 25.The pitching was strong once again holding the Aggies to one run on five hits. Dustyn Schramm got the start and earned the win going eight innings only allowing four hits. Senior Austin Moore came in for the ninth to close out the game.Four Utes had multiple hits led by Matt Richardson who went 3-3 on the afternoon. Over the two games, Richardson went 6-7 at the plate.Isaac Deveaux and Isaac Cruz both singled in the second putting two runners on for Richardson and he came through. Richardson hit a single to center field to score Deveaux to give Utah a 1-0 lead.In the fourth, Chandler Anderson hit a triple and then it was Deveaux, Cruz and Richardson that did the damage once again bringing in two more runs. Erick Migueles capped the inning off knocking in Richardson from second with a double to left field.From there, Utah’s pitching was too good as Schramm struck out three on the day.Cruz went 2-3 on the afternoon and had one RBI and scored one run as he got the start at second base.With the win, Utah won four of its final five games of the season against Washington State and UC Davis the last two weekends. May 25, 2019 /Sports News – Local Utah Baseball Ends Season on High Note With 5-1 Win Over UC Davis Written by Tags: Utah Utes Baseballlast_img read more

Prep Sports Roundup: 8/23

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first_img Written by FacebookTwitterLinkedInEmailPrep FootballSALINA, Utah-Gavin Brown completed 11 of 14 passes for 194 yards and four touchdowns and the Richfield Wildcats outlasted the North Sevier Wolves 25-20 Friday in non-region football action. Brittyn Riddle (25 touches, 171 scrimmage yards, 3 rec TD’s) led the Wildcats as well in the win. With North Sevier leading 14-13, Richfield took the lead for good by converting a 1st and Goal from the Wolves’ 41-yard line, while Brown hit Ethan Udy for the score to give Richfield a lead they would not relinquish.Taylor Crane completed 17 of 28 passes for 221 yards, 3 touchdowns and an interception in defeat for the Wolves. Gabe Wilcox had 12 carries for 75 yards and Hunter Higgs amassed 7 receptions for 141 yards and a score for the Wolves in defeat.Richfield next faces Payson August 30 at home and North Sevier visits Coalville to face North Summit August 30.RANDOLPH, Utah-Sam Orton tossed for four touchdown passes and added a 22-yard touchdown run as the Kanab Cowboys downed the Rich Rebels 40-0 in non-region football action Friday. Karson Blomquist added a 19-yard touchdown run for the Cowboys.NEPHI, Utah-Zac Cowan threw two touchdown passes and ran for another score as the Juab Wasps bested the Cedar City Reds 34-26 Friday in non-region football action. Cade Bowring had touchdown runs of 7 and 3 yards for the Wasps as well in the victory.MONROE, Utah-Matt Bowler returned a punt 40 yards for a touchdown and Ryan Moody returned an interception 20 yards for another score as the Enterprise Wolves downed South Sevier 21-14 in non-region football action Friday. Jaxin Torgerson had scoring runs of 1 and 35 yards in the loss for the Rams.FILLMORE, Utah-Brooks Myers threw a touchdown pass and ran for two more scores as the Millard Eagles pounded Judge Memorial 46-0 Friday in non-region football action. Austin Burraston and KC Whitaker also ran for touchdowns in the win for the Eagles.GUNNISON, Utah-Bryson Barnes threw five touchdown passes and the Milford Tigers routed the Gunnison Valley Bulldogs 46-8 in non-region football action Friday. Gage Griffiths added a 3-yard touchdown run in the loss for the Tigers. Carson Yardley had a touchdown run for the Bulldogs in defeat.CASTLE DALE, Utah-Payton Clawson, Connor Jorgensen, Landon Bowles and Parker Lee each ran for touchdowns and the North Sanpete Hawks smacked Emery 43-6 Friday in non-region football action. Bowles also threw a 28-yard touchdown pass to Kaden Taylor in the win for the Hawks and Lee added a 23-yard fumble recovery for a score for North Sanpete.MANTI, Utah-Jax Parry threw two touchdown passes and Ryker Hewko threw a touchdown pass, ran for a touchdown and caught a pass for another score as the Manti Templars drubbed Class 5-A Payson 41-22 in non-region football action Friday. Keenan Moulton added another score on a blocked kick and Tyler Taukeiaho had a 39-yard touchdown run for the Templars.BEAVER, Utah-Ryker Albrecht had a pair of scoring runs and Kaleb Barney ran for a score while returning an interception for another touchdown as the Beaver Beavers smacked the Delta Rabbits 40-0 Friday in non-region football action. Alex Hollingshead tossed a 25-yard touchdown pass to Porter Albrecht and McCoy Smith added a 6-yard touchdown run for the Beavers.Baseball1A South RegionPRICE, Utah-The Wayne Badgers put up 11 runs in the top of the 1st inning and cruised from there with a 17-4 win over Pinnacle in 1A South Region baseball action Friday.JUNCTION, Utah-The Valley Buffaloes won a pitcher’s dual over Piute, 3-2 in 1A South Region baseball action Friday.PANGUITCH, Utah-The Panguitch Bobcats scored 10 runs in the fourth inning to seal the deal in a 16-3 win over Bryce Valley in 1A South Region baseball action Friday.VolleyballNon-RegionALTAMONT, Utah-The Altamont Longhorns swept the Wayne Badgers, 3-0 in non-region volleyball action Friday. Altamont won 25-14, 25-13, 25-14.TABIONA, Utah-Tabiona topped Wayne 3-0, 25-11, 25-13, 25-14, in non-region volleyball action Saturday. Brad James Tags: Brittyn Riddle/Ethan Udy/Gabe Wilcox/Gavin Brown/Hunter Higgs/North Summit/Payson/Taylor Crane August 23, 2019 /Sports News – Local Prep Sports Roundup: 8/23last_img read more

Weber State Football’s Jay Hill Named AFCA Regional Coach of the Year

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first_img Written by December 10, 2019 /Sports News – Local Weber State Football’s Jay Hill Named AFCA Regional Coach of the Year FacebookTwitterLinkedInEmailOGDEN, Utah-Tuesday, Weber State head football coach Jay Hill was named as the FCS Region 5 Coach of the Year by the American Football Coaches Association.Hill, who is 34-14 (.708) in his sixth season as the Wildcats’ head coach, has Weber State in the FCS quarterfinals Friday evening against Montana and has led the squad to four consecutive FCS playoff appearances, a school record.Other school records Hill has achieved include three straight Big Sky Conference titles, three straight 10-win seasons and a No. 3 ranking, which the Wildcats are currently ranked ahead of the quarterfinals game against the Grizzlies.Hill’s 34 wins are tied for the most in school history and he is 21-3 (.875) in Big Sky games over the course of the past three seasons.This is Hill’s first Region Coach of the Year honor and he is only the second coach in program history to achieve this.Veteran college head coach Mike Price won this award at Weber State in 1987. That season, the Wildcats went 9-2 (6-1 in Big Sky play) and advanced to the then-I-AA quarterfinals. Brad James Tags: AFCA/Coach of the Year/Jay Hill/Weber State Footballlast_img read more

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