By Sharon Chester
About The Product
Published by means of the yank Geophysical Union as a part of the Antarctic learn Series.
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Extra resources for Antarctic Bird Studies
Sorensen's Islandroyalsare the suchasstorms at seathatmightdelayegglaying,no five recordsfor the Campbell evidenceas yet showswhetherclimaticconditionsin same (Table 14). Althoughthe differences between periodsof exulans andepomophora any oneseason influence the layingdatethroughoutmeanincubation arelessthanoneday,muchlessthanRichdale significant abovethe Comparison of meanlayingdatesin twopartsof predicted,they are statistically thepopulation. Therateof anembryo's a precisely timed phenomenon, and Richdale  in anareaofhighnestdensity (106nests perhectare) the accuracyof his measurements condoes notdifferfromanother of lowernestdensity (40 in discussing samples in whichthe observed nestsper hectare).
Exulans males and females. longerbroodingshiftsis apparentaboutthe mid-point of the broodingperiod, and a decreasein their frequencyin the last shift beforeits end. 9 J 12 ' % Total Observations * Richdale , p. 72. ing. Chicks were watchedat Bird Island throughout the winter of 1963, and 35 measurementsaccurate to the nearestday showthe meanlength of the fledging period to be 278 days, with a range from 263 to 303 days (Table 28). 24 days. the absent bird. Swales  indicatesthe fledging wanderersat THE FLEDGLING PERIOD Gough Island stay ashore approximatelythe same Matthews  estimatedthat the chicks at South lengthof time, but, as mentionedpreviously,both laylater therethan Georgiaremainedashore9 to 10 monthsafter hatch- ing and departureare correspondingly at SouthGeorgia.
Oct. Nov. 58O per day,respectively, but in eachcasethe meandaily weightlosswasgreaterduringthe first 25 days. The meandailyweightlossin chick405 from 5 to 30 days after feedingis almostexactlytwicethe rate at 55 to 80 days. Chick444, whichdied after 58 days,was a month younger at the start of the fast than 405, which sur- vived81 days. In this respectit is interestingthat chicks216 and 422 begantheir fasts later by one and two months,respectively, and each had a smallermean daily weightloss (119 and 111 grams per day).