Modeling the consequences of Antarctic krill harvesting on Antarctic fur seals

admin zcpmw , , , , , , , , , , , , , ,

first_imgIn terms of the convention governing the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR), management advice for the Antarctic krill (Euphausia superba) fishery should take the needs of the predators of krill into account in order to reduce the risk of deleterious impacts on such predators (e.g., baleen whales and numerous fish, seal, penguin, and flying bird species). A single species yield model is currently being used by the CCAMLR Scientific Committee to recommend an annual krill catch limit, which is expressed as a proportion (γ = 0.116) of a survey biomass estimate. This approach takes the needs of predators into account in only a crude way by assuming that a median krill escapement of 75% of its unexploited biomass would be sufficient to meet the needs of predators. A krill–predator modeling procedure is presented that could be used to directly assess the impact of krill harvesting on krill predator populations and therefore to revise this recommended harvesting level (γ) for Antarctic krill. Application of a deterministic form of this model to an Antarctic fur seal (Arctocephalus gazella) data set from Bird Island, South Georgia, Antarctica, indicates that the level of krill fishing intensity (γ) that would reduce this population to half the equilibrium size in the absence of krill fishing (γhalf) lies between 0.03 and 0.18, which includes the level recommended by CCAMLR. This large range results primarily from the sensitivity of the model to the maximum growth rate parameter, for which a range of 5–15%/yr is investigated. A plausible range of values for this parameter (5–15%/yr) results in estimated γhalf values from 0.04 to 0.23. Stochastic calculations (which take account of interannual fluctuations in the abundance of the krill population due to recruitment variability) yield higher estimated γhalf values than the less realistic deterministic calculations. However, simulation tests indicate that the estimated γhalf values are biased upward; this modeling approach is therefore likely to yield γhalf values that would lead to a depletion of the Antarctic fur seal population to more than half its pristine size.last_img

You May Also Like..

Design your own Comic Relief Red Nose

first_img Howard Lake | 2 October 2017 | News WATCH: The history of the red nosesHow well do you remember all the many red nose designs for Red Nose Day?[youtube][/youtube]  422 total views,  2 views today AddThis Sharing ButtonsShare to TwitterTwitterShare to FacebookFacebookShare to LinkedInLinkedInShare to EmailEmailShare to WhatsAppWhatsAppShare to MessengerMessengerShare to MoreAddThis8 AddThis Sharing ButtonsShare to TwitterTwitterShare to FacebookFacebookShare to LinkedInLinkedInShare to EmailEmailShare to WhatsAppWhatsAppShare to MessengerMessengerShare to MoreAddThis8 For the first time Comic Relief is inviting ideas for new designs for their fundraising icon, the Red Nose. School children across the UK are being encouraged to design next year’s Red Nose for Comic Relief’s 2019 Red Nose Day in March.One pupil’s design will be selected as the winner and go on sale in Sainsbury’s and Oxfam shops across the country. Five runners-up will also have their nose designs 3D printed.Magical landThe theme for the character to be designed is ‘magical land’. Designs have to be submitted on the official template and they have to be original, and to appeal to a wide audience “but especially children and young people”.The nose designs must use only red, white, silver or gold as the main Nose colour, although black and white can be used for detail.The closing date for entries to The Red Nose Design Challenge is 8 December 2017 at 5pm. There is a maximum number of seven entries per school. About Howard Lake Howard Lake is a digital fundraising entrepreneur. Publisher of UK Fundraising, the world’s first web resource for professional fundraisers, since 1994. Trainer and consultant in digital fundraising. Founder of Fundraising Camp and co-founder of Researching massive growth in giving.center_img Design your own Comic Relief Red Nose Tagged with: Comic Relief Red Nose Day Advertisement  421 total views,  1 views todaylast_img

Entries open for 2020 Insight in Fundraising Awards

first_img AddThis Sharing ButtonsShare to TwitterTwitterShare to FacebookFacebookShare to LinkedInLinkedInShare to EmailEmailShare to WhatsAppWhatsAppShare to MessengerMessengerShare to MoreAddThis Melanie May | 17 February 2020 | News Tagged with: Awards insight  312 total views,  3 views today AddThis Sharing ButtonsShare to TwitterTwitterShare to FacebookFacebookShare to LinkedInLinkedInShare to EmailEmailShare to WhatsAppWhatsAppShare to MessengerMessengerShare to MoreAddThis Entries open for 2020 Insight in Fundraising Awards Entries for the 2020 Insight in Fundraising Awards are now open, with two new categories for this year.This is the ninth year of the annual Insight in Fundraising awards, which are aimed at charities of all sizes and causes. The new categories are Most Powerful Visualisation, which focuses on communicating insight through visualisation, and Most Powerful Use of Insight Impacting the Longer Term, which focuses on the ability of insight to deliver long-term strategic impact. The award categories in full are:Under Technical Expertise: Most Powerful Application of Data Analysis; Most Powerful Insight Using Research; and Most Powerful Visualisation.Under Use of Insight in Fundraising Disciplines: Best Use of Data and Analysis in Digital Fundraising; Most Powerful Use of Insight in High Volume Fundraising; Most Powerful Use of Insight in Partnerships and Philanthropy; and Most Powerful Use of Insight impacting the longer-term.Under Insight at Work: Best Use of Insight in a Small to Medium Sized Charity; Team of the year; Supplier of the Year; and Rising Star. Entry is free with a deadline of 6pm on 3 April, and winners will be announced at the Gala Dinner on 17 June.More information plus links to the nomination form for each category is available on the Insight in Fundraising Awards site.  311 total views,  2 views today Advertisement About Melanie May Melanie May is a journalist and copywriter specialising in writing both for and about the charity and marketing services sectors since 2001. She can be reached via

Airport shutdowns confirm: People Power will bring Trump down!

first_imgAt San Francisco airport New York City, Jan. 28 — Tonight was a vibrant, instant display of People Power. I was among many thousands of protesters at JFK International Airport.A firestorm was unleashed by Trump’s Jan. 27 executive order declaring a racist ban on Muslims traveling to the U.S. from seven countries that have been targets of the U.S. military. News quickly swept the country that passengers from targeted countries were being stopped at U.S. Customs, even though they had visas, and were not being allowed to enter the U.S. The speed of Trump’s proclamation was intended to demoralize and overwhelm the whole population.The opposite happened!Every minute of tonight’s protest was an incredible, empowering experience. Even as we went out to the airport, other passengers, those waiting both on the subway platform and on the train itself, cheered us and shook our hands. Many took pictures, posing next to us and wishing us success.Usually, you get stony stares and even some fearful glances if you are on a subway with protesters carrying signs to a demonstration.When we switched from the subway to the AirTrain to JFK, police formed a line to try to stop us. They said only people with airline tickets would be permitted through the turnstiles. Our chants of “When Muslim lives are under attack, what do we do? Stand up! Fight back!” were picked up by hundreds of people who were stopped. The cops finally backed down after we all chanted nonstop: “Shut it down! Shut it down!”That is when we suddenly realized we wouldn’t be a few hundred people at the airport. Many thousands were on their way and were refusing to be stopped. With chants, cheers and raw determination we all just swept past the police.The entire International Arrivals Terminal was overwhelmed by demonstrators. They lined the railings of the parking garages and blocked traffic on the roads.Even while chanting, everyone was on their phones — texting, tweeting, networking, connecting to friends to hurry to the airport to challenge Trump’s anti-Muslim travel ban.Information swept through the crowds and was transmitted over social media. Airport workers waved and cheered. It was learned that the Taxi Drivers Alliance, so many of them immigrants, had called a work stoppage on trips to and from the airport in solidarity with the actions and against the ban.The protests went viral. Word came of scores of other protests at airports across the U.S.Federal Judge Ann Donnelly at U.S. District Court in Brooklyn, N.Y., soon granted a stop to deportations of all those detained on entry to the U.S. at airports nationwide. Her ruling followed a legal action filed by the American Civil Liberties Union. Minutes later Federal Judge Leonie Brinkema in Alexandria, Va., issued a temporary restraining order blocking for seven days the removal of green-card holders detained at Dulles International Airport.This short pause in deportations was propelled by sudden, massive pressure from below.Today was a giant step in a protracted struggle. The massive protests on Jan. 20 and 21 had given new confidence to the struggle against Trumpism.The lesson of today is that only the power of the people can force the courts to act. It is a valuable lesson. It is becoming increasingly clear to millions of people that voting won’t help them. The whole established order is frozen in crisis. Only immediate and massive people’s resistance can take on and take down Trump and his appointed nest of vipers.This is a moment of unprecedented solidarity. The response to Trump has swept the country and moved tens of thousands into confrontation.FacebookTwitterWhatsAppEmailPrintMoreShare thisFacebookTwitterWhatsAppEmailPrintMoreShare this At Salt Lake City, Utah, airport. New York Taxi Workers Association called for a work stoppage at JFK airport. AT JFK airport. In Hamtramck, Mich. At Philadelphia airportlast_img

Leave a Reply

Your email address will not be published. Required fields are marked *