By Sharon Chester
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Published through the yank Geophysical Union as a part of the Antarctic study Series.
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Additional resources for Antarctic Bird Studies
N. Vol. 12 TICKELL TABLE 15. Difference betweenTwo Incubation Periods of Eggs Laid by the Same Pairs of D. exulans Band no. Figure 25 showsthat this ous shorter ones. In the three seasons that incubation is not so in exulans, where the means of the second recordswere kept at Bird Island, the lengthsof 2009 throughthe sixth shiftsare eachabout 10 days. Except for ever, the frequencycurve for the lengthsof the first the first female shift that begins when she lays the through the fourth shifts are all positivelyskewed egg, an incubationshift is definedas one that begins (Figures26, 27), and the meansare probablynot a andendswith successful relief of a sittingbird.
12 BIOLOGY OF THE GREAT ALBATROSSES 23 TABLE 10. DifferencesBetweenMean Laying Dates of The GoughIsland wandererslay later than thoseat South Georgia. Comer [Verrill, 1895] reportedfirst eggs there on December26, and Swales  on Difference between January9 (Table 11). 01 those at Campbell Island lay approximatelythree weekslater, from late Novemberto early December birdslayingin thesetwo odd-yearseasons are mostly (Table 13). Thoselaying in 1963-1964are wanderers,and from the few data available [Westerpredominantly differentbirds of the other demipopu- skor, 1963] theseseemalso to lay later, probably as lation.
N D. 284 0-13 D. Boththesespecies are burrownesters,and theirneglected eggsarenotdestroyed. Eggsleft unattended in thealbatross's opennests areusually taken * Computedfrom Richdale . •' Theprobability of values of t of thisorderoccurring by by skuasor sheathbills (Chionisalba). 06. eggmentionedsurvivedonly becauseit remainedon sideof thenestwithin30 centimeters of thesitting royalfemales lay overa shorter givenspanthanthe the bird. full extentof thelayingperiodof thespecies. The records of 35 incubation periods periodoverwhichany individual laysis probably Richdale's for epomophora give a mean of 79 days with a range determined genetically andbehaviorally.
Antarctic Bird Studies by Sharon Chester