Aspects of the geology of the Scotia Arc

first_imgA review is given of the geology of the islands of the Scotia Arc. The provenance of the sedimentary materials is considered and it is concluded that the islands probably represent areas with a crustal structure of a continental type. The crustal structure of the Scotia Sea area is briefly compared with that of the Caribbean.last_img

Biomass and respiration of nematode populations in two moss communities at Signy Island, maritime Antarctic

first_img1. The biomasses of free-living soil nematodes from a moss turf and a moss carpet, two contrasting bryophyte ecosystems in the maritime Antarctic, are analysed and compared with other tundra studies. 2. The mean annual live-weight biomass of nematodes from the moss turf ranged from 105 to 355 mg m-2, that from the moss carpet showed less variation being from 222 to 236 mg m-2. 3. Seasonal variations from a low winter biomass to a high summer value are explained by seasonal fluctuations in soil temperature. 4. Total annual nematode population respiration at the two sites was very similar, being 1726.1 μl O2 m-2 d-1 in the moss turf and 1761.0 μl O2 m-2 d-1 in the moss carpet. 5. Nematodes form an important part of the soil fauna and are responsible for 16% and 35% of the metazoan respiration in the moss turf and carpet respectively. 6. The short Antarctic summer and generally low temperatures limit nematode production to 0.95 and 1.12last_img read more

Known, new and proably snow petrel breeding locations in the Ross Dependency and Marie Byrd Land

first_imgSnow Petrels (Pagodroma nivea) breed circurnpolarly in Antarctica. Watson et al. (1971), Harper et al. (1984) and Marchant & Higgins (1990) list breeding sites in the Ross Dependency (160°E-150°W) and also in the unclaimed region of Antarctica (150°W-80°W), which comprises Marie Byrd Land and Ellsworth Highland. Much of the literature on Snow Petrels mentions that their nests are inaccessible on vertical cliffs (Kinsky 1965, Cowan 1981, Harper et al. 1984, Broady et al. 1989) and so are almost impossible to count accurately. The birds usually nest in holes and on ledges on exposed, snow-free cliff faces, although some nests have also been found on gentle slopes below (Strandtman 1978, Broady et al. 1989). Many more expeditions, predominantly geological, have been made to Northern Victoria Land in the Ross Dependency than to Marie Byrd Land, where only five expeditions with accompanying biologists have been made (Siple 1938, Perkins 1945, Rudolph 1967, Strandtman 1978, Broady et al. 1989). Consequently more Snow Petrel breeding sites are recorded for Victoria Land than for Marie Byrd Land. However, the literature reveals that there are sometimes uncertainties in the criteria used to assign breeding site status. The science, necessarily limited to broad-scale observation and collecting because of remoteness, logistics involved, and bad weather in the case of far-ranging deep field parties, suits many geological and botanical expeditions but hampers precise ornithological observations. Many expedition reports mention flocks (small (15 and large > 15 birds) of Snow Petrels near rock outcrops, but this is not strong evidence of breeding. In our updated list of breeding sites we have used the following criteria: (a) birds settling on ledges and disappearing inside cracks on steep cliff faces and birds flying off these ledges, (b) streaks of guano below these ledges, (c) presence of nearby nesting skuas with regurgitated Snow Petrel bones and feathers as evidence of feeding, and (d) the presence of large flocks of birds constantly wheeling around the same rock outcrop. Prolonged observation with binoculars of suspected nests in cliffs is desirable but largely impossible during wide-ranging trips. We have tried to use all the above criteria but for some colonies have had to use a minimum of two because of incomplete data in the literature. We regard several colonies listed by Harper et al. (1984) and Marchant & Higgins (1990) as needing confiiation because they do not satisfy these criteria. Figure 1 gives the locations of the main areas, and Table 1 is a list of Snow Petrel colonies in the region 160°E-80°W, together with locations for nine new colonies. As far as possible nest numbers are given but these, except for those on gentle slopes, should be regarded as estimates.last_img read more

A new oxytomid bivalve from the Upper Jurassic – Lower Cretaceous of Antarctica

first_imgPraeaucellina umbonoradiata gen. et sp. nov. is a small pteriomorph bivalve from the Upper Jurassic-Lower Cretaceous of Antarctica which can be referred to the family Oxytomidae, within the superfamily Monotoidea. Sub-rounded to strongly obliquely elongated in outline, it is markedly inequivalve. The left valve is somewhat narrower than the right, and the latter possesses a clearly defined, but tiny, anterodorsal ear. This feature takes the form of a rounded blade which is strongly inclined with respect to the plane of commissure. This is a typical oxytomid feature, as is the presence of a pseudoctenolium. Indeed, there is now a considerable volume of morphological and stratigraphical evidence to suggest close phylogenetic ties with Late Jurassic-Early Cretaceous genera such as Aucellina and Oxytoma. Other austral oxytomids, such as Arctotis and Maccoyella, comprise a distinct morphological subgroup characterized by much thicker hinges. Whilst elucidation of the features of Praeaucellina helps to consolidate the taxonomic differences between the Oxytomidae and Buchiidae, it highlights further possible similarities between the former of these categories and the Monotidae. Resolution of phylogenetic relations within the Monotoidea will greatly assist studies of the evolution of Mesozoic high-latitude bivalve faunas.last_img read more

Jurassic belemnite distribution patterns: implications of new data from Antarctica and Argentina

first_imgBelemnites are nektopelagic cephalopods which developed a widespread pattern of distribution in the Jurassic, and most authors have accepted that their centre of origin was Europe. Available data suggest that the belemnites developed a global distribution only in the Toarcian, some 15 Ma after their first appearence in the European Hettangian. Development of the Boreal and Tethyan belemnite realms took place in the Middle Jurassic and continued through to the Cretaceous. New data from Argentina and the Antarctic Peninsula reaffirms the development of the global distribution of belemnites in the Toarcian, and sheds new light on the biogeographical patterns for the Jurassic of the southern hemisphere. This has considerable implications for understanding the development of faunal realms in the Mesozoic.last_img read more

Understanding Antarctic Peninsula precipitation distribution and variability using a numerical weather prediction model

first_imgDaily precipitation fields and annual means from the European Centrefor Medium-range Weather Forecasts re-analysis exercise are used to examine the distributionand variability of precipitation across the Antarctic Peninsula. The annual meanprecipitation field from the model agrees well with the available ice-core data and suggeststhat the maximum accumulation for the area is on the western side of the barrierat about the 200 m level where the annual total is close to 1.3 m w.e. The Peninsula is shownto be a very effective barrier to the zonal movement of precipitati ng weather systems,which results in quite different atmospheric flow regimes being responsible [or significantprecipitation events on either side of the divide. Frontal depressions are the primarysource of large daily snowfall totals on both sides of the Peninsula. On the southern coastof the Bellingshausen Sea, major snowfall events are often linked to strong northerly flowwhen the atmospheric circulation is blocked. Predominantly northerly flow is also responsiblefor significant snowfall on the Ronne Ice Shelf, which often occurs in associationwith lee cyclogenesis events to the east of the Peninsula.last_img read more

Rose announces the addition of Jesse Wade to BYU basketball

first_img Written by Robert Lovell FacebookTwitterLinkedInEmailPROVO, Utah – Coach Dave Rose announced today that guard Jesse Wade has enrolled in school and officially joined the BYU men’s basketball program. After sitting out the 2018-19 season due to NCAA transfer rules, Wade will have three seasons of eligibility.Wade, a 6-foot-1 guard, comes to Provo from Gonzaga where he played his freshman season in 2017-18. At Gonzaga, Wade appeared in 20 games and posted season highs of nine points, three rebounds and three steals.A native of Kaysville, Utah, Wade prepped at Davis High School where he played for Jay Welk and Chad Sims. As a senior in 2014-15, Wade was named Mr. Basketball by the Deseret News and was the No. 1 recruit in Utah according to and That season he averaged 26.8 points, 4.2 rebounds, 3.5 assists and 2.7 steals per game while leading Davis to a record of 20-4 overall (11-1 in region play) and a trip to the 5A semifinals.During his junior season at Davis, Wade averaged 17.6 points per game to go along with 3.5 rebounds, 3.2 assists and 2.4 steals per game. He earned first-team all-state honors and led the Darts to the 5A state semifinals. As a sophomore, Wade averaged 14.8 points, 2.4 rebounds, 2.4 assists and 2.0 steals while earning third-team all-state honors.Wade concluded his high school career with 1,367 points, 207 3-point field goals, 208 assists and 164 steals. Following his high school career, Wade served a mission for The Church of Jesus Christ of Latter-day Saints in France. Tags: Basketball/BYU Cougars/Jesse Wade September 5, 2018 /Sports News – Local Rose announces the addition of Jesse Wade to BYU basketballlast_img read more

Dixie State Softball To Host Camps Later This Month

first_img FacebookTwitterLinkedInEmailST. GEORGE, Utah-Per a Tuesday announcement from the Dixie State softball program, there will be two camps later this month, a pitching clinic and an elite camp.The pitching clinic will be Friday September 28 at Karl Brooks Stadium from 5:00-8:00 p.m. and costs $75 per camp.This will feature instruction from Dixie State head coach Randy Simkins and select members of the 2018-19 Dixie State softball roster.This is a camp for 9th-11th graders and will include high-level instruction in all areas of the game. All campers will be able to show their skills to coaches.This camp is limited to the first 10 campers to register online at elite camp is Saturday September 29 from 8:00 a.m.-4:00 p.m. and costs $150 per camper.All of the Dixie State softball staff will be on hand for this camp and again is limited to campers from 9th-11th grade.This camp is limited to the first 25 who register online, also at September 4, 2018 /Sports News – Local Dixie State Softball To Host Camps Later This Month Written by Tags: Dixie State Softball/elite camp/pitching camp/Randy Simkins Brad Jameslast_img read more

Former Millard High Star Anna Camp Finishes 20th At Mountain Regional

first_img Tags: Anna Camp/BYU Cross Country/NCAA Mountain Regional Championship Brad James November 9, 2018 /Sports News – Local Former Millard High Star Anna Camp Finishes 20th At Mountain Regional FacebookTwitterLinkedInEmailPROVO, Utah-Friday as the BYU men’s and women’s cross country squads hosted the NCAA Mountain Regional Meet, former Millard High star Anna Camp excelled amid a talented field.Camp, a sophomore for the Cougars, placed 20th in a time of 20:30.60, making herself eligible to be selected for the national meet November 17 at Madison, Wis.Camp was among the stars for the BYU women in the 6-K race who helped the Cougars place third overall.Should Camp qualify for the national championship meet, we will let you know as swiftly as we can.The rules listed on the U.S. Track & Field and Cross Country Coaches Association’s Web site state individual selections occur from individuals not selected as members of qualifying teams (BYU finished third so only the top two teams from every regional automatically qualify for the national championships), two additional athletes will be selected from the remainder of the national pool. Written bylast_img read more

Reports: Relief pitcher Jeurys Familia returning to Mets

first_img Beau Lund December 13, 2018 /Sports News – National Reports: Relief pitcher Jeurys Familia returning to Mets Written bycenter_img FacebookTwitterLinkedInEmailScott Clarke / ESPN Images(NEW YORK) — It appears relief pitcher Jeurys Familia is heading back home to Queens.Multiple reports say the Dominican right-hander has agreed to a three-year deal with the New York Mets. The deal, which is pending a physical, is for $30 million.Familia, 29, joined the Mets as a non-drafted free agent in 2007 when he was 17. He made his MLB debut with New York five years later.Familia remained with the Mets until this past July, when he was traded to the Oakland Athletics.Last season, he had a 3.13 ERA with 83 strike outs and 18 saves.So far in his career, Familia has a 2.73 ERA with 369 strike outs and 124 saves.Copyright © 2018, ABC Radio. All rights reserved.last_img read more