Only one estimate of sex ratio at hatch exists for Greater Sage-Grouse (Centrocercus urophasianus). Managers typically assume a ratio at the population level of approximately 2:1 (female:male), primarily on the basis of sex ratio in the harvest. We determined the sex of newly hatched young and unhatched Greater Sage-Grouse by amplifying a portion of the sex-linked CHD gene. Sex ratio for Greater Sage-Grouse in east-central Nevada was 0.51 ± 0.03 (SE; n = 272). We found no substantial difference in size between eggs that produced male chicks and those that produced females (44.5 ± 0.2 mm3 vs. 44.3 ± 0.3 mm3) or between the masses of male and female chicks (25.8 ± 0.3 g vs. 26.3 ± 0.3 g), which suggests that energetic cost investments by females were similar between offspring of different sexes. We also found no effect of female condition on differential investment in male versus female offspring. Given that adult survival does not differ substantially between the sexes in our study population (J. S. Sedinger unpubl. data), we suggest that this population may not contain 2 adult females to 1 adult male and that any bias in adult sex ratio is likely attributable to differential survival from hatch to first breeding.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.