Survival of freezing by free-living Antarctic soil nematodes

first_imgFree-living microbivorous nematodes become numerically dominant in Antarctic terrestrial faunas as environmental conditions become more severe, while also reaching very high levels of abundance in moist, vegetated habitats. Nematodes have little resistance to freezing via exogenous ice nucleation, such as would occur as their microhabitat freezes. We report the results of experiments testing the ability of seven maritime Antarctic nematode taxa to survive freezing in small water droplets at high sub-zero temperatures. Isolated individuals of these species possessed supercooling characteristics similar to those previously reported (supercooling points -6 to -25 degree C). When frozen in water at -3 to -6 degree C, most showed high (> 70%) survival both (i) after rapid cooling (1 degree C/min) to c. -60 degree C followed by immediate rewarming, and (ii) when held for 7-12 h at either -10 or -30 degree C, although the proportions surviving varied between species. We propose that the ability to survive freezing while fully hydrated at high sub-zero temperatures is one of the most important aspects of these species’ survival tacticslast_img read more

City of Alpena Planning and Development Director moves to Chamber of Commerce

first_imgAddThis Sharing ButtonsShare to FacebookFacebookShare to TwitterTwitterShare to MoreAddThisALPENA, Mich. — A well–known community employee is now changing titles. Adam Poll, Planning and Development Director for the City of Alpena, is transitioning into a new role at the Chamber of Commerce.Poll will step in as President and CEO at the Chamber since the previous president moved on from the position back in January. Poll says he’s up to the challenge, and his 13 years of experience makes him the man for the job.“One of my roles as Planning and Development Director is economic development, so over the course of my years here, I’ve learned about a number of different programs that are available through government grants, that kind of thing, that are advantageous, and I think can be of use in this position.Adam is a native Michigander and has lived and worked in Alpena for six years. His first day at the chamber is March 30.AddThis Sharing ButtonsShare to FacebookFacebookShare to TwitterTwitterShare to MoreAddThis Tags: Adam Poll, Chamber of Commerce, City of Alpena, Planning and Development DirectotContinue ReadingPrevious Hospice of Michigan enlisting the help of veteransNext Plans for the Bagley Street move forwardlast_img read more