Modelling reproductive effort in sub-and maritime Antarctic mosses

first_imgA comparison is made of the reproductive effort (RE), considered as the investment in sporophyte relative to gametophyte biomass, of eight species of moss occurring at sub-and maritime Antarctic sites. Six of the species showed smaller sporophytes and game-tophytes at the climatically more extreme maritime Antaretic sites and one species showed no size difference between regions. The remaining species, although showing no regional difference, showed some evidence of a reverse pattern, with higher altitude samples having greater biomass than lower altitude samples. Spore counts indicated a measure of compensation in maritime Antarctic samples, with no significant decrease in spore output in several species despite smaller sporophyte biomass. The relationship between sporophyte (S) and gametophyte (G) biomass within samples was described by an allometric curve (S=aGb) which gave a better fit than a straight line for six species. This form of model allows comparisons of patterns of RE to be made between samples with non-or partially overlapping size distributions, even when the relationship involves size-dependence. An allometric curve was not appropriate for describing samples of one species (Andreaea regularis), and insufficient data were available to identify any relationship in Polytrichum alpinum. The exponent (b) differed between species, but there were no statistically significant differences between exponents from samples of the same species. Samples of two species could further be described by the same coefficient (a), indicating that they lie on the same curve. However, samples of three species from sub-Antarctic South Georgia gave significantly higher coefficients, indicating increased RE relative to maritime Antarctic populations.last_img read more

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Some Sunman Residents Without Power In Monday Storms

first_imgSUNMAN, Ind. – Some Duke Energy customers in Sunman lost electricity during the storms on Monday night. The company says there are approximately 23 locations currently without power. The households are in the area of N. Spades Road and E. County Road 1300 N. Showers and storms are moving through the region tonight with a low temperature of 48 degrees. The National Weather Service says some storms could be accompanied by winds and some hail. More rain is expected Tuesday in the early morning hours and after daybreak.last_img

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Starc impresses as Australia beat Derbyshire in tour match

first_imgMITCHELL Starc again impressed on the final day as Australia beat Derbyshire by an innings and 54 runs at Derby.The left-arm fast bowler took 4-39 as Derbyshire were all out for 112, with Tony Palladino absent injured.Starc, who has 211 wickets in 51 Tests but is yet to feature in the Ashes so far this summer, finished with seven wickets in the three-day match.Australia now face England in the fourth Test at Old Trafford on Wednesday, with the series tied at 1-1.Steve Smith, who missed Australia’s third-Test defeat with concussion, had made just 23 with the bat on Friday but was not needed to bowl as the tourists wrapped matters up in less than 20 overs’ play.Australia needed seven wickets yesterday to force the innings victory – with Derby resuming on 53-3, needing another 113 to make the Aussies bat again – and they struck early when Alex Hughes was bowled off the inside edge by Michael Neser.Leus du Plooy top-scored with 37 but fell lbw to Mitchell Marsh, while Matt Critchley was left unbeaten on 17, as Starc removed Derbyshire’s last two batsmen for ducks.Australia had rested their entire first-choice pace attack from the third Test at Headingley with Pat Cummins, Josh Hazlewood and James Pattinson all sitting the game out, as did spinner Nathan Lyon.But with Smith almost certain to return to the Test side at Old Trafford, Australia must decide who to leave out if all-rounder Marnus Labuschagne is retained in the XI. (BBC Sport)last_img read more

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