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By F. S. Bodenheimer (auth.)

ISBN-10: 940175845X

ISBN-13: 9789401758451

ISBN-10: 9401763100

ISBN-13: 9789401763103

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203 (1950) of the Ohio Wildlife Research Unit, Ohio State U niversity. , An Experimental Approach to the Study of Bird Populations. The Wilson Bulletin, Vol. 66, No. 4 (1954), pp. 253-258). 4 '' D WJ '' ' ' ', ' ', ...... I Incubation is also important in May, which seems, however, not to be a critical period with regard to the physical environment. June again, with hatching and rearing of the young, is critical. The paired temperature and rainfall appear important. 5 o C and 64 to 117 mm rain.

11 Fig. 6. Population trend in the native plaited bee-hive (below) at Ankara. Calculated population: Black. larvae; 3. sealed brood; 4. nurse bees; 5. house bees; 6. field bees. Dotted line (A): Actually counted population showing the numbers of actually hibernating adults. Observe the delayed summer peak, showing the slow beginning of the annual increase (From BoDENHEIMER, 1942). where a = age of population in days, e = constant daily oviposition rate. The age-distribution after the 63rd day is of the typical bell shape of a stagnant population.

He tried a great number of possible mathematical curves to find the one best suited to the experimental data. The well-known curves of ARRHENIUS and of VAN'T HOFF (Q 10) were wholly unsatisfactory. e. the inverse of the hyperbola). WADLEY concluded, however, that a very flattened S- (logistic) curve, almost straight in its long middle part, may fit better. Yet all curves with a more or less satisfactory empirical fit are rather complicated to calculate (true also of PRADHAN's 12 formula), and are beyond the reach of the average ecologist.

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