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By Sharon Chester

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Published by way of the yankee Geophysical Union as a part of the Antarctic learn Series.


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Extra resources for Antarctic Bird Studies

Sample text

This method providesno measureof the amount of individualfeedsby each parent. A weight increment over 24 hours may have resultedfrom dne or severalfeeds by either or both parents. Thus, wanderingalbatrosses apparentlydo not return to the breedinggroundsto feed their chicksduring the night, though they may arrive at dawn and leave at sunset. 01). Richdale'sintensiveobservationsof the first royal chickrearedat Taiaroa Head May 7-22, 1938, revealthe sametendency. m. m. , 1« hours before sunset. To determinethe growth rate of wandering albatrosschicksa groupof 23 selected chickswereweighed daily at Bird Island from March 25, 1963, until all had fledgedand departedJanuary7, 1964.

Though in[1950] dividualfemales maybesubject to weather conditionsof 77 to 81 days(---1-24hours). 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[1952] significant abovethe Comparison of meanlayingdatesin twopartsof predicted,they are statistically thepopulation.

Fig. 26. and twelfth 15 Lengths of 250 first (female) incubation into the brooding period. Richdale'sfigures for the eleventh 10 LENGTH OF SHIFT (DAYS) shifts in D. exulans. shifts do not show this so well wanderersfor two seasons(Table 18). The differences for epomophora, but the smallsizeof his samplesmay between them in each female varied betwen 0 and 9 be responsible for misleadingmeans. 2 days. Nothing indicatesthat the It remainsto examinethe incubationshiftsfor any lengths of the first shiftsshowany similarityfor indiindicationof individual birds habitually sitting for vidualsin differentyears.

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