a zooplankton biolo

a zooplankton biologist with the National Oceanography Centre.

the copepods migrate back to the surface to reproduce. Jónasdóttir knew that Calanus continue to breathe while hibernating and burn off most of their body fat This means they leave behind carbon dioxide in the deep ocean—a phenomenon Jónasdóttir has dubbed “the lipid pump” Curious about the total amount of carbon sunk this way she and several colleagues combined surveys of Calanus abundance and distribution from oceanographic cruises in the North Atlantic and measurements of copepod biology such as their fat content and respiration rates during hibernation In the region of the North Atlantic that they studied copepods may be leaving below about 1 million to 3 million tons of carbon a year they estimate in a preprint posted online this month That’s about the same amount as contained in all the dead phytoplankton and feces that sink each year in the same place “It is a relatively conservative estimate” Jónasdóttir writes in an email “We did not want to hype a story that is pretty amazing” The numbers for Calanus are still quite rough mostly because of uncertainty about respiration rates and the length of hibernation And it’s not clear how much carbon might be taken down by other kinds of copepods and in other oceans so the overall size of the lipid pump is hazy “Getting the numbers is difficult at best” says Jefferson Turner a zooplankton biologist at the University of Massachusetts Dartmouth who nonetheless calls the results “interesting and potentially important” Still don’t count on these tiny marine creatures to curtail global warming Jónasdóttir does not expect that copepods will begin taking more carbon from the atmosphere to the deep ocean “I cannot see a potential mitigation of the CO2 buildup” And what will climate change mean for the copepods Although it’s hard to predict Mayor says that warmer seas should generally raise the copepods’ respiration rate In turn that could potentially reduce the rate at which copepods produce lipid and haul its carbon to the depths Mayor says: "This would reduce the strength of the ‘lipid pump’—bad” he tweeted. At LDF,Written by Agencies | Mumbai | Published: June 18a robbery attempt was made at Lindsay’s house in May, By contrast, The nonprofit Imazon, Kolkata Walk Tours You must take at least one Kolkata Walk tour, his latest.Written by Shalini Langer | New Delhi | Published: March 13

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