Spatial structure of the Southern Ocean ecosystem: predator-prey linkages in Southern Ocean food webs

first_img1. The food chain of the Southern Ocean has often been characterized as simple and homogeneous. However, the population processes of a key prey organism, krill Euphausia superba, operate over ocean basin scales and are strongly influenced by large scale abiotic factors. 2. A model was developed in which the local prey abundance was regulated by a continuous, hydrodynamically mediated, supply rate and the concentrating effects of abiotic-biotic interactions. This model was used with estimates of the annual predator demands and the prey concentration for the South Georgia area to investigate the relationship between flow rate and depletion in prey concentration as a function of distance from a predator colony. 3. The model results indicated that concentrating factors need to be large to produce the build-up of krill densities of the order estimated to occur in the South Georgia area, with the peak retention rates required some distance offshore. It was, however, found that, for the estimated supply rates, the region does not need to be an area of particularly high prey concentration to support the estimated predator impact. 4. Differential predator foraging ranges produced a more complex response to the reduction of the abundance of particular predators by harvesting, than in the situation where foraging ranges overlapped completely. In such a system the more inshore foraging predators encountered the greatest changes in prey abundance. 5. Random fluctuations in the interannual prey availability were introduced into the simulation of the flow system. This could lead to apparent population cycling in predator and prey abundance due to the interactive form of the system, although the prey population dynamics were not involved. The system enhanced variability such that inshore foraging predators encountered greater variation in prey supply. 6. The model results emphasize the importance of investigating the magnitude and timing of the horizontal fluxes of secondary production in this spatially distributed ecosystem.last_img read more

Bacolod SP mulls health declaration card for travelers

first_imgRojas said there is a need for aneffective mechanism in order to combat infectious disease in order to protectthe people of Bacolod. BACOLOD City – The SangguniangPanlungsod approved on first reading a measure that would require travelersarriving in this city to fill up a health declaration card in a bid tostrengthen border quarantine measures against coronavirus disease 2019(COVID-19). Councilor Cindy Rojas, chairperson ofthe SP’s committee on health, introduced the “Bacolod City Health DeclarationCard Ordinance.” It will enjoin all airlines, shipping lines, hotels, and otherestablishments in this city to require all of their passengers and guests toaccurately provide their travel history regarding whether they have visitedCOVID-19-stricken countries over the past 14 days before entry. “The City recognizes the importance ofaccurate medical information in combating viral or infectious emerging andre-emerging diseases in the City of Bacolod considering that there is a highchance that travelers unknowingly may be carriers of such unwanted virus ordisease,” Rojas stressed. She added the outbreak of infectiousdiseases is very alarming, citing a World Health Organization report statingthat millions or individuals around the globe are affected, which results todeath every year./PNlast_img read more

No. 16 Syracuse’s frontcourt struggles continue despite 77-57 win over Wake Forest

first_imgMaeva Djaldi-Tabdi stationed herself on the left block and squatted, backing down Wake Forest’s Raegyn Branch. She pivoted right before turning over her left shoulder with a shot attempt, but Branch was there to block it. The center hustled back on defense and into the paint, but committed a foul. On Syracuse’s next possession, Djaldi-Tabdi got another chance. Again, she was stuffed. She grabbed the offensive rebound and went up, but was denied again. Fourteen seconds later, her field goal didn’t hit the rim. A giveaway led to her being subbed out, having totaled four missed shots, a turnover, and a foul in just three minutes. Djaldi-Tabdi’s struggles epitomized the inconsistent post-play that the Orange have been suffering of late. A game after SU’s forwards combined to shoot 11-of-37 and allowed 28 points in the paint, No. 16 Syracuse (19-5, 8-3 Atlantic Coast) struggled to make an impact inside Sunday in its 77-57 win over Wake Forest (10-15, 1-11). The Demon Deacons dominated the Orange by the basket, blocking six shots and grabbing 18 offensive rebounds that led to 32 points in the paint. SU’s 13 3-pointers, including nine in the first half, helped propel it to victory, but the win had its share of difficulties.“Size always matters down there in the post,” SU head coach Quentin Hillsman said. “We just wasn’t getting a body on them. They had 12 (offensive rebounds) in the first half…12 is way too many in a half.”Wake Forest’s rotation, which featured five players 6-foot-1 or taller, proved to be an issue on both sides of the ball. Offensively, Syracuse struggled to push inside shots over the Demon Deacons’ forwards. In turn, it shifted its offensive game plan to the perimeter.  AdvertisementThis is placeholder textSU drained three 3-pointers in the opening eighty-four seconds, prompting Wake Forest to call a quick timeout. Led by Miranda Drummond, the Orange hit five triples in the first quarter alone. The Demon Deacons kept pace by corralling seven offensive rebounds in their own poor shooting quarter (5-of-20).While SU’s shooting kept it ahead of Wake Forest, its defense prevented it from allowing the lead to grow. The frontcourt’s rebounding struggles correlated almost directly to Syracuse’s guards’ defense on its full-court press. When the Orange used the press, the Demon Deacons sliced through it easily. After getting up court, Wake Forest often had opportunities that left SU outnumbered. Even if a bad shot went up, it was hard for Syracuse to box out because of the numbers disadvantage.“We have no scheme for that, we can’t box out 3-on-2, it’s just tough to play that way,” Hillsman said. “Having them play in unsettled situations, it’s tough to box out when you play unsettled.”Susie Teuscher | Digital Design EditorAfter scoring 31 of its 39 first-half points outside the paint, the Orange tried again to get their inside game going to start the second half. Mangakahia fed Amaya Finklea-Guity deep in the paint after the center had secured post position, but her righty post hook was met with 6-foot-2 Ivana Raca’s third block of the game.Wake Forest scored the first points of the third quarter, but then Kiara Lewis found Mangakahia for a 3 to get the Orange on the board. WFU’s tallest player, 6-foot-4 Maya Banks, dominated SU’s defense. She scored seven points in the third quarter alone, leading her team to its best period of the game and cutting its lead to just seven entering the fourth.“It’s different watching on film, you actually don’t know how big they are until you look down in warmups,” Mangakahia said. “I think their size helped them a lot, especially their defense on our posts, they were doing well on defense.”It took until the fourth quarter for Syracuse to make a significant adjustment. After a Digna Strautmane 3-pointer increased the Orange’s lead to 12 with 8:23 to go, Hillsman called a timeout. In the huddle, he discussed a better way to defend the Demon Deacons’ offense. Syracuse incorporated more match-up elements to its 2-3 zone for a solidified rebounding effort. Hillsman also made sure his team took away Wake Forest’s offense at the high post, where it had been having success. The switch forced the Demon Deacons to make a game-low four field goals in the frame. SU changed its game plan on offense as well. By the fourth, the Orange had made 11 3-pointers, prompting Wake Forest to be more aggressive in guarding the perimeter. In turn, Syracuse finally had success inside. Pump fakes drew block attempts and allowed for drives to the rim. Double teams led to open cutters to the basket. After scoring 14 points in the paint in the first three quarters, SU scored 14 in the fourth alone.Following the game, Hillsman said his team was playing solid, but not great. It still has rebounding and defensive issues. On Sunday, against a Demon Deacons team that came into the game 1-10 in the ACC, “solid” was enough to win. With a matchup against No. 6 Notre Dame next Monday and postseason play looming, solid won’t be good enough. “I think we don’t realize the amount of size we have sometimes,” forward Emily Engstler said. “It’s not the same team as last year. Yeah, (size) had a factor in the game, it always will, but at the end of the day, I think we can matchup just as they can matchup us.” Published on February 17, 2019 at 3:53 pm Contact Eric: [email protected] | @esblack34 Commentscenter_img Facebook Twitter Google+last_img read more

EURO 2016 Qualifiers: With Rooney injured, Walcott eyes England striker role

first_imgArsenal’s Theo Walcott is hoping to lead the line for England if Wayne Rooney does not recover from an ankle injury in time to face Estonia at Wembley on Friday.The Manchester United and England captain is a major doubt for the Euro 2016 qualifier after missing two training sessions, with England manager Roy Hodgson reportedly set to name Gary Cahill skipper if Rooney misses the game.Hodgson has used Walcott mostly on the right for England, but the 26-year-old has impressed in a central role for his club this season and has admitted that is where he wants to play for the national team as well.”I know everyone would like to see me up front,” Walcott told reporters before the Estonia game.”Playing there for England, that’s what I want to do.”England qualified for next year’s finals in France with a 6-0 victory in San Marino on Sept. 5 and have won all eight of their qualifiers so far. Walcott, who grabbed a brace in the San Marino game and has 12 goals in his last 14 Premier League starts, revealed that his improved form was down to advice from Arsenal manager Arsene Wenger and former team mate Thierry Henry, who is back at the club in a coaching role.”He (Wenger) asked if I could be more aggressive on the pitch,” Walcott said.”I actually said (to Wenger), ‘Do you want me to start kicking people?’ That was my first reaction. He said, ‘No, I’m not saying that.'”Again he wanted me to be more aggressive in terms of running at players, closing them down, tracking back, being there and in their faces,” Walcott added.The striker also said Henry has been a key factor in his improvement. “I have been chatting to him on a personal level behind the scenes as well to learn things from him,” Walcott said.”It is a great tool to have in the locker … I’ve had quite a few words with him about some of the games I’ve played.”He has just given me his analysis and if I’ve needed to ask him some questions about it, he’s always there,” he added.–Follow Joy Sports on Twitter: @Joy997FM. Our hashtag is #JoySportslast_img read more