Reproductive strategies of male and female Loligo forbesi (Cephalopoda: Loliginidae)

first_imgThe reproductive strategies of male and female Loligo forbesi Steenstrup, 1856 were investigated from samples obtained from commercial catches and research cruises in Irish waters. In females maturity increased with size, but in males two modes in the size at maturity were identified, with approximately 40% mature at small size (180–200 mm mantle length), and the remainder mature at >250 mm mantle length. The difference in estimated age of the two modes of mature males was small, so size differences were probably due to different growth rates. Growth and maturation proceeded together in both sexes over much of the life-cycle. The effect of maturation on relative growth of somatic tissues was examined using analysis of covariance and multivariate regressions. In males there was a significant decline in total mass, and in mass of mantle, head and viscera, relative to mantle length with maturation. In females total mass was not significantly affected by maturation, but relative masses of head, mantle and viscera declined with maturation, indicating that energy was diverted from somatic growth to gonad production. Potential fecundity estimates were obtained by counting eggs and ova in the oviduct and ovary of mature females and were in the range 2500 to 10,500 (mean 5800). Fecundity was positively related to mantle length. The ovaries of mature females contained a range of egg sizes and developmental stages, indicating that spawning probably occurs intermittently.last_img read more

Six million years of glacial history recorded in volcanic lithofacies of the James Ross Island Volcanic Group, Antarctic Peninsula

first_imgBasaltic volcanism in the James Ross Island region has been persistent over the last 6 million years resulting in at least 50 mainly effusive eruptions that are preserved predominantly as lava-fed deltas and a small number of tuff cones. Most of the eruptions took place during glacial periods, and the deltas have enabled the characteristics of the palaeo-glacier cover to be deduced for the first time, for multiple time slices. The resolution of Ar-40/Ar-39 dating of young basaltic lavas is relatively poor compared with the duration of glacial-interglacial periods and precludes any Milankovitch-scale cyclicity being identified, a problem that is now becoming acute in palaeoenvironmental investigations of this type. Our results indicate that glacial periods were characterised by a relatively thin glacier cover in this area, typically just 200-350 in. They were interspersed with fewer periods of thicker ice c. 600-750 in in thickness. These are likely maximum estimates and they may be too high by a few tens of metres. The glacier cover increased in thickness toward the present. However, as evidenced by 4.6 myr-old surfaces at c. 620 in a.s.l. that are glacially unmodified other than frost shattering, no evidence has been found for a substantially thicker ice sheet at any time during the last 6 myr. The glacier cover was formed predominantly of ice (sensu stricto) that was wet-based and erosive. Thus it had a temperate or, probably more likely, sub-polar (i.e. polythermal) thermal regime and, if the ice reached the continental shelf edge, it must have had a low profile. After an early history (c. 6.2-4.6 Ma) dominated by an areally extensive Antarctic Peninsula Ice Sheet (APIS), the local glacial morphodynamics were determined by a local ice cap that draped James Ross Island and was presumably confluent with the APIS along its western margin. These results are the first evidence for the morphology, thickness and thermal regime of the glacier cover in the northern Antarctic Peninsula region for the late Neogene-Quaternary period.last_img read more

The impact of changes in sea ice advance on the large winter warming on the western Antarctic Peninsula

first_imgOver 1979–2007 near-surface air temperatures on the maritime western side of the Antarctic Peninsula have increased throughout the year, with the greatest monthly temperature rise of 1.7 °C dec−1 occurring in July as recorded at Faraday/Vernadsky (F/V) station (65.4°S, 64.4°W). The warming trend in this month has been the result of a loss of very cold days at the station with the average number of days with mean temperature below − 15 °C decreasing from 7 during 1979–1988 to 0.6 over 1998–2007. There is a high anti-correlation between temperatures at F/V and the extent of sea ice in July just to the west of the station. Passive microwave satellite imagery reveals that monthly ice concentrations here have decreased by up to 25% since the late 1970s creating a polynya-like feature along the west coast of the peninsula. Sea ice extent over the southern Bellingshausen Sea has decreased markedly during the late summer and early autumn so that there has been a lengthening of the ice-free season. Yet faster ice advance in June as a result of changes in the meridional component of the wind means that the overall ice extent in the Bellingshausen Sea in July (offshore of the F/V region) has not changed significantly. Years of extensive sea ice can occur as frequently now as in the earlier part of the record, but a combination of the changing nature of the ice advance and subtle shifts in the wind direction have led to the more frequent occurrence of the ice-free area to the west of F/V in recent years. There are also indications of pre-conditioning of the ice/ocean system to the west of F/V well before winter that is associated with the presence or absence of the ice anomaly that is observed in July.last_img read more

Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity

first_imgWe present observations from the Falkland Islands Super Dual Auroral Radar Network radar of the propagation of HF radio waves via the Weddell Sea Ionospheric Anomaly (WSA), a region of enhanced austral summer nighttime ionospheric electron densities covering the southern Pacific and South Americas region. This anomaly is thought to be produced by uplift of the ionosphere by prevailing equatorward thermospheric winds. Of particular interest are perturbations of the WSA-supported propagation, which suggest that during periods of geomagnetic disturbance, the ionospheric layer can be lowered by several tens of kilometers and subsequently recover over a period of 1 to 2 h. Perturbations can appear singly or as a train of two to three events. We discuss possible causes of the perturbations and conclude that they are associated with equatorward propagating large-scale atmospheric waves produced by magnetospheric energy deposition in the auroral or subauroral ionosphere. Changes in high/middle latitude electrodynamics during geomagnetic storms may also account for the perturbations, but further modeling is required to fully understand their cause.last_img read more

Bees Edge Chihuahuas In El Paso

first_img Tags: Baseball/PCL/Salt Lake Bees FacebookTwitterLinkedInEmail(El Paso, TX) —  The Bees overcame an early four-run deficit as they edged the Chihuahuas 6-5 in El Paso.Rymer Liriano and David Fletcher each drilled two-run homers for Salt Lake.  Eric Young Junior drove in the winning run on a groundout in the sixth.  Taylor Cole earned the relief win.Game three of the five-game series is tonight at 7:05 p.m. Written by April 27, 2018 /Sports News – Local Bees Edge Chihuahuas In El Paso Robert Lovelllast_img

Utah State Football Announces Kick Times for Six Games in 2018

first_img Tags: Football/Utah State Aggies July 26, 2018 /Sports News – Local Utah State Football Announces Kick Times for Six Games in 2018 FacebookTwitterLinkedInEmailLOGAN, Utah – Utah State football announced kickoff times for six of its games during the 2018 season, including five of its home games.Utah State’s first two home games of the season will both kickoff at 6 p.m. (MT), as the Aggies will host New Mexico State on Saturday, Sept. 8 and Tennessee Tech on Thursday, Sept. 13. USU begins Mountain West play the following weekend as it hosts Air Force on Saturday, Sept. 22 in a game that will be televised nationally on one of the ESPN networks. A start time and television provider for that game will be announced in mid-September.Utah State’s three remaining Mountain West home games will all be 2 p.m. (MT) starts as it hosts UNLV on Saturday, Oct. 13, New Mexico on Saturday, Oct. 27 and San José State on Saturday, Nov. 10.Furthermore, Utah State’s road game at Colorado State on Saturday, Nov. 17 will begin at Noon (MT).Broadcast outlet information for the six games listed above will be announced in the coming weeks.Utah State, which returns 18 starters (O-9, D-9) and 48 letterwinners (O-19, D-27, S-2) from last year’s NOVA Home Loans Arizona Bowl team, will open the 2018 season on Friday, Aug. 31, at Michigan State. The game will be televised nationally on the Big Ten Network and begin at 5 p.m. (MT).For Aggie football ticket information, fans can contact the USU Athletics Ticket Office over the phone by calling 1-888-USTATE-1 or 435-797-0305 during regular hours of operation. Fans can also buy their tickets in person at the USU Ticket Office inside the Dee Glen Smith Spectrum or online by clicking on the “Buy Tickets” tab at www.UtahStateAggies.com.Fans can follow the Aggie football program at twitter.com/USUFootball or on Facebook at Utah State Football, as well as on Instagram at instagram.com/USUFootball. Aggie fans can also follow the Utah State athletic program at twitter.com/USUAthletics or on Facebook at Utah State University Athletics. Written by Robert Lovelllast_img read more

SUU Men’s Basketball Commences Big Sky Season By Hosting Montana Schools

first_imgDecember 28, 2018 /Sports News – Local SUU Men’s Basketball Commences Big Sky Season By Hosting Montana Schools Brad James FacebookTwitterLinkedInEmailCEDAR CITY, Utah-Saturday and Monday, Southern Utah men’s basketball commences the Big Sky Conference portion of their schedule by hosting Montana and Montana State at the America First Event Center.The Thunderbirds enter the game against Montana State Saturday with a 5-4 record. This is the second consecutive season Southern Utah has entered the conference season with an above .500 record, commemorating the first time this has happened in the school’s Division I history.The Thunderbirds are currently averaging 79.5 points per game and surrendering 74.5 points per contest.Senior forward Dwayne Morgan averages a team-best 13 points per game with redshirt junior guard/forward Cameron Oluyitan posting 12.9 points per game for Southern Utah.The Bobcats come into Saturday’s tilt at Cedar City sporting a record of 3-7. Montana State’s leading scorer is senior guard Tyler Hall, who averages 19.7 points per contest.As the Thunderbirds host Montana Monday, the Grizzlies come in with a 7-4 record. The Grizzlies score 72.1 points per game and surrender 67.6 points per contest.The Grizzlies are a guard-oriented offense as redshirt senior guard Ahmaad Rorie (14.9 points per game) and senior guard Michael Oguine (14.3 points per game) are the leading scorers for Montana. Tags: Ahmaad Rorie/Big Sky Conference/Cameron Oluyitan/Dwayne Morgan/Michael Oguine/Montana/Montana State/SUU Men’s Basketball/Tyler Hall Written bylast_img read more

Prep Sports Roundup: 2/1

first_img Brad James Region 20 CASTLE DALE, Utah-Brodie Tuttle posted 26 points as the Emery Spartans routed North Sanpete 85-63 in Region 15 boys basketball action Friday. Scott Hatch had 26 points in the loss for the Hawks. JUNCTION, Utah-Kelby Jessen stepped up with 17 points and the Piute Thunderbirds smacked Escalante 86-42 Friday in Region 20 boys basketball action. Bracken Lyman’s 18 points led the Moquis in the loss. Region 14 Region 15 Girls Basketball BLANDING, Utah-Jaxon Torgerson amassed 29 points and 7 rebounds on 11 of 14 shooting as the San Juan Broncos overpowered South Sevier 69-57 Friday in Region 15 boys basketball action. The Broncos blew open a close game with a 13-2 run to commence the second half, ultimately winning the 3rd Quarter 25-14 en route to a 13-6 record and 5-4 in region play. Brandt Williams had 18 points and 8 rebounds in the loss for the Rams as they fell to 14-4 and 6-3 on the season. San Juan is next in action Saturday afternoon against Richfield with South Sevier playing Grand at Moab Saturday afternoon. MANTI, Utah-Adam Huff led the way with 23 points as the Manti Templars routed American Heritage 87-47 in non-region boys basketball action Friday. Sam Beckwith posted 15 points in the loss for the Patriots. February 1, 2019 /Sports News – Local Prep Sports Roundup: 2/1 RICHFIELD, Utah-Jarica Steck and Sipola Vakautakakala had 12 points apiece as the Richfield Wildcats pounded Grand 62-21 Friday in Region 15 girls basketball action. Hannah Owen had 10 points for the Red Devils in the loss. Non-Region FILLMORE, Utah-Crayton Hollingshead led the way with 12 points and the Beaver Beavers edged Millard 36-33 Friday in Region 18 boys basketball action. Austin Burraston’s 12 points led the Eagles in the loss. Region 18 MOAB, Utah-Kevin Park led the way with 20 points and the Grand Red Devils got past Richfield 55-52 Friday in Region 15 boys basketball action. Emmett Hinck and Keldon Anderson had 11 points apiece in the loss for the Wildcats. FacebookTwitterLinkedInEmailBoys Basketball DELTA, Utah-Derek Smith amassed 28 points on six 3-pointers as the Delta Rabbits pounded the Maeser Lions 71-37 in Region 14 boys basketball action Friday. Hugh Jackson’s 13 points led the Lions in defeat. MONROE, Utah-Kenzie Jones amassed 29 points as the South Sevier Rams smacked San Juan 60-36 in Region 15 girls basketball action Friday. Delaney Palmer’s 3 points led the Broncos in defeat. Region 15 Written by PAROWAN, Utah-Porter Wood netted 33 points as the Parowan Rams routed Kanab 67-50 in Region 18 boys basketball action Friday. Sam Orton had 20 points in the loss for the Cowboys.last_img read more

Scoreboard roundup — 5/22/19

first_img FacebookTwitterLinkedInEmailiStock(NEW YORK) — Here are the scores from Wednesday’s sports events:MAJOR LEAGUE BASEBALLINTERLEAGUEKansas City 8 St. Louis 2Tampa Bay 8 LA Dodgers 1Miami 6 Detroit 3St. Louis 10 Kansas City 3AMERICAN LEAGUEOakland 7 Cleveland 2Texas 2 Seattle 1NY Yankees 7 Baltimore 5Boston 6 Toronto 5, 13 InningsChi White Sox 9 Houston 4Minnesota at LA Angels 9:07 p.m., postponedNATIONAL LEAGUEMilwaukee 11 Cincinnati 9San Diego 5 Arizona 2Colorado 9 Pittsburgh 3NY Mets 6 Washington 1Chi Cubs 8 Philadelphia 4Atlanta 9 San Francisco 2MAJOR LEAGUE SOCCERVancouver 2 New York 2Copyright © 2019, ABC Radio. All rights reserved. May 23, 2019 /Sports News – National Scoreboard roundup — 5/22/19 Written bycenter_img Beau Lundlast_img read more

Bees Hammer Dodgers

first_imgAugust 2, 2019 /Sports News – Local Bees Hammer Dodgers Robert Lovell Written by FacebookTwitterLinkedInEmail(Salt Lake City, UT) — The Bees piled up six runs in the second inning as they hammered the Dodgers 14-4 in Salt Lake City.Jarrett Walsh and Anthony Benboom homered for Salt Lake and every player in the lineup recorded a hit. Jose Rodriguez worked three innings for the win.The Bees host the New Orleans Baby Cakes tonight. Tags: PCL/Salt Lake Beeslast_img