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Sex allocation is the allocation of resources to male versus female reproduction in sexual species. In dioecious species, where individuals are male or female for their entire lifetimes, the allocation decision lies between producing male or female offspring. In sequential hermaphrodites, where individuals function as one sex early in life and then switch to the other, the allocation decisions. Adaptive sex allocation in birds the complexities of linking theory and practice komdeur, j. , 29-mar-2002, in philosophical transactions of the royal society of london. However, compelling evidence for adaptive sex allocation in birds is still very scant.   adaptive sex allocation in birds the complexities of linking theory and practice. Author information (1)zoological laboratory, university of groningen, po box 14, 9750 aa haren, the netherlands. Nl we review some recent theoretical and empirical developments in the study of sex allocation in birds. Previous article next article from knowable magazine a world in a bottle of water. The extent of biases in sex allocation in bird populations most studies showing biased sex allocation in birds---1 have found rather small biases. Even al extreme values of the variable related to the sex ratio of offspring, the mean sex ratio may deviate from equality by only 10 or so. Offspring sex ratios in birds, measured at the level of either the population or the individual, do not normally exhibit the extreme degrees of skew found in apomictic species, or in amphimictic species in which sex allocation is under environmental determination (cockburn et al.). As a general explanation of differential juvenile mortality, the first of these two theories is unsatisfactory because increased male mortality is known to occur in several bird species where. Evolutionary theory predicts that females should manipulate the sex of their offspring in response to characteristics of the rearing environment (trivers & willard 1973). 2004), compelling examples of sex allocation exist, particularly among birds (heinsohn et al.).

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