Publications by authors named "Guillermo Gomez-Lopez"
Variation in offspring sex ratio, particularly in birds, has been frequently studied over the last century, although seldom using long-term monitoring data. In raptors, the cost of raising males and females is not equal, and several variables have been found to have significant effects on sex ratio, including food availability, parental age, and hatching order. Sex ratio differences between island populations and their mainland counterparts have been poorly documented, despite broad scientific literature on the island syndrome reporting substantial differences in population demography and ecology.
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- Variation in offspring sex ratios among animal species is well-studied, especially in birds with pronounced differences between sexes, but less is known about species like the monomorphic griffon vulture that lay single eggs.
- Researchers analyzed data from three breeding populations in central Spain over 30 years to assess factors affecting the sex ratio of nestling vultures, finding no overall deviations from parity.
- They discovered that tree-nesting breeders might produce more male offspring, but due to small sample sizes, more research is needed to clarify these findings and their implications for vulture population dynamics.