First Aspidorhynchidae (Pisces: Teleostei) from Antarctica

first_imgA new fossil teleost, belonging to the family Aspidorhynchidae Nicholson & Lydekker, Aspidorhynchus antarcticus sp. nov., was obtained from a block of reworked Upper Jurassic tuffaceous mudstone in the lower (Albian) part of the mid-Cretaceous Whisky Bay Formation of James Ross Island, Antarctic Peninsula. Additional material, assignable to Aspidorhynchus sp., was collected from in situ Upper Jurassic marine rocks (Nordenskjöld Formation) at Longing Gap, northern Antarctic Peninsula. Not only is this the first reported occurrence of the family from Antarctica, it is also the first unequivocal record of Aspidorhynchus outside Europe; prior to this discovery, the genus had only been reported with certainty in marine deposits from the Middle Jurassic to Lower Cretaceous of England, France and Germany. This is the earliest neopterygian fish so far recovered from marine rocks in the Antarctic.last_img read more

Exploring former subglacial Hodgson Lake, Antarctica Paper I: site description, geomorphology and limnology

first_imgAt retreating margins of the Antarctic Ice Sheet, there are a number of locations where former subglacial lakes are emerging from under the ice but remain perennially ice-covered. This paper presents a site description of one of these lakes, Hodgson Lake, situated on southern Alexander Island, west of the Antarctic Peninsula (72° 00.549′ S, 68° 27.708′ W). First, we describe the physical setting of the lake using topographic and geomorphological maps. Second, we determine local ice sheet deglaciation history and the emergence of the lake using cosmogenic isotope dating of glacial erratics cross-referenced to optically stimulated luminescence dating of raised lake shoreline deltas formed during ice recession. Third we describe the physical and chemical limnology including the biological and biogeochemical evidence for life. Results show that the ice mass over Hodgson Lake was at least 295 m thick at 13.5 ka and has progressively thinned through the Holocene with the lake ice cover reaching an altitude of c. 6.5 m above the present lake ice sometime after 4.6 ka. Thick perennial ice cover persists over the lake today and the waters have remained isolated from the atmosphere with a chemical composition consistent with subglacial melting of catchment ice. The lake is ultra-oligotrophic with nutrient concentrations within the ranges of those found in the accreted lake ice of subglacial Lake Vostok. Total organic carbon and dissolved organic carbon are present, but at lower concentrations than typically recorded in continental rain. No organisms and no pigments associated with photosynthetic or bacterial activity were detected in the water column using light microscopy and high performance liquid chromatography. Increases in SO4 and cation concentrations at depth and declines in O2 provide some evidence for sulphide oxidation and very minor bacterial demand upon O2 that result in small, perhaps undetectable changes in the carbon biogeochemistry. However, in general the chemical markers of life are inconclusive and abiotic processes such as the diffusion of pore waters into the lake from its benthic sediments are far more likely to be responsible for the increased concentrations of ions at depth. The next phases of this research will be to carry out a palaeolimnological study of the lake sediments to see what they can reveal about the history of the lake in its subglacial state, and a detailed molecular analysis of the lake water and benthos to determine what forms of life are present. Combined, these studies will test some of the methodologies that will be used to explore deep continental subglacial lakeslast_img read more

Bagpipe Band enters 15th season of entertaining fans

first_imgWednesday nights, the unmistakeable sound of bagpipes echoes out of the back of Washington Hall. The Notre Dame Bagpipe Band is preparing for Saturday home football games.The band currently consists of 13 members, according to sophomore band pipe sergeant Tyler Johnson. And while the band may contain differing levels of experience, the passion that radiates off each of the members, decked out in their kilts and belts, as they lead the Irish into the stadium with their rendition of “Scotland the Brave” is undeniable. Photo courtesy of Dylan Klee The Notre Dame Bagpipe Band poses in Notre Dame Stadium on Sept. 5 prior to the Texas game. “We have nine pipers and four drummers,” Johnson said. “Most bagpipers have experience, but I do some teaching with new people who want to learn. I don’t think any of the drummers have any experience with bagpipe bands.” Sophomore Allegra Wallingford, who plays snare drum for the band, said she joined this year because she loved the idea of being a part of a Notre Dame tradition.“I joined because I love playing music and wanted a way to do that while I’m here,” she said. “I also really enjoy being part of something very traditional and playing in bagpipe band makes me feel very connected to Notre Dame.” The band’s roots can date back to the early 1950s, according to their website, when the Irish Guard was began as a bagpiper unit in the Notre Dame Marching Band. But the bagpipes did not fare well in the cold and were abandoned by the Irish Guard until the 1990s, when Paul Harren formed a band and started teaching students how to play. The band first performed at football games during the 2001 season.Sending off the football team to meet their opponents isn’t the only thing the band does on game day, Johnson said. The band’s Saturdays consist of several short performances throughout the day. “For typical football weekend with a 3:30 p.m. kickoff, we’ll start at 11:30 a.m.,” he said. “We’ll play a fifteen minute concert in front of the dorm, we’ll play marching through LaFun and then we’ll do the player walk.”Johnson said playing for a group that’s so well-known and beloved by the Notre Dame community has been a lot of fun. “I’ve been playing for twelve years — I’m the pipe sergeant of the band,” he said. “So I’ll do all the tuning and some logistic work, stuff like that. I play with a band back home, but on game days, it’s probably the best crowd I ever play for. It’s just insane the number of people who crowd around, especially because most people hate the bagpipes.”In addition to football game days, the band plays in a variety of other concerts through the year. They’ve even performed in the St. Patrick’s Day parade in Chicago, Johnson said.  “My experience has been pretty cool, being able to play for so many people and having such a receptive crowd,” he said. Tags: bagpipe band, football, Football Friday Feature, Game Daylast_img read more

Mourinho confirms Fabregas interest

first_img Arsenal have an option to buy back the Spaniard as part of the deal that took him to the Nou Camp in 2011 but currently appear unlikely to do so, leaving the door open for their London rivals to move for the 27-year-old. And while Blues boss Mourinho did not confirm that a bid was imminent, he did admit that he was monitoring the situation closely. Press Association “We have some interest,” Mourinho told several national newspapers. “We have some interest. I have interest in analysing the situation. “I think it looks like he’s really interested in leaving Barcelona, and is very, very interested in coming back to England. This I think is clear. “After that it’s not something for us, or another team, for now. It’s not for now, or tomorrow, or for before the World Cup. “There is a process where he wants to leave, he wants to come to England because it’s the country where he wants to be, where he prefers to play. “We are interested in monitoring the situation.” If Fabregas were to arrive at Stamford Bridge, it would likely be as a replacement for Frank Lampard who announced last week he would not be returning this summer after 13 years and 211 goals in west London. The 35-year-old was a lynchpin during Mourinho’s first spell in charge at the club and the Portuguese insists the door is always open for the England international to return in some capacity. “It’s not the end of Frank’s career at Chelsea – it’s just a little break,” he said. Jose Mourinho has confirmed he is interested in bringing Cesc Fabregas to Chelsea with the midfielder seemingly on the brink of leaving Barcelona. “It’s the end of his career as a Chelsea player, but he will be back for many, many years because he’s one of the most important players in the club’s history. “You can’t imagine how difficult it was for him to leave. “I think only he knows because we spoke – not by phone, in person – but at the same time I can feel some happiness about the process because for sure he comes back to Chelsea one day. For sure. “Everybody wants it, (owner) Mr Abramovich – the number one, the most important person – wants very much Frank to be back, I want him to be back, the staff want him back, so he comes back for sure. “And the other thing is that he can come back the way he wants. “Mr Abramovich has left the door completely open for him on the understanding Frank can do anything he wants at this club. He can try things, feel where he is better suited, we can feel as a club where he can give us more, but he can come back when he wants and, to repeat Mr Abramovich’s words, the way he wants. “He can be a coach, he can start at the academy, he can start being my assistant at the same time because he is doing his coaching badges, or he can start in a different role. “He can decide in this moment whether he wants to start immediately in a coaching role, or if he wants to be an ambassador, representing the club in important places of our life – he can do what he wants.” last_img read more