Sexual Dimorphism: The Horns of African Antelopes

@article{Packer1983SexualDT,
  title={Sexual Dimorphism: The Horns of African Antelopes},
  author={Craig Packer},
  journal={Science},
  year={1983},
  volume={221},
  pages={1191 - 1193}
}
  • C. Packer
  • Published 16 September 1983
  • Biology, Medicine
  • Science
Comparisons of the horns of males and females across genera of African antelopes indicate that male horns are better adapted for clashing or pushing against another pair of horns during intrasexual combat. The horns of females are relatively more specialized as stabbing weapons. Horns in females are found in only half the genera and in those genera where females have horns, the genera are heavier than genera with hornless females. 
Morphology of Horns and Fighting Behavior in the Family Bovidae
TLDR
A phylogeny of bovid tribes suggests that features of morphology of horns and fighting behavior are rapidly evolving and frequently convergent.
The significance of horns and other male secondary sexual characters in female bovids
Abstract A new model for the evolution of horns in female bovids postulates that females mimic male secondary sexual characters to buffer their male offspring against the aggression of dominant
Sexual Differences in Aggressive Behaviour of the Apennine Chamois
TLDR
Sexual differences in patterns of aggressive behaviour may be related to the different gregariousness of females and males, probably influenced by resource availability in the habitats they use.
Mating system correlates of tarsal spurs in the Phasianidae
Two methods for the analysis of cross-species data are used to investigate whether tarsal spur length or number are correlated with mating system in three phasianid subfamilies. One method, the
Sexual Dimorphism in the Raccoon (Procyon lotor): Morphological Evidence for Intrasexual Selection
TLDR
It is indicated that intrasexual selection is a viable explanation of why male raccoons are larger than females because males are relatively larger for characters that relate to male-male combat.
Horn asymmetry and fitness in gemsbok , Oryx
The relationship between fluctuating asymmetry in horns of gemsbok (Oryx g. gazella) and a number of fitness components was determined in a field study in Etosha National Park, Namibia. The length
Intrasexual selection and phylogenetic constraints in the evolution of sexual canine dimorphism in strepsirhine primates
TLDR
It is demonstrated that polygynous lemurs are at most subject to weak intrasexual selection on dental traits used in male combat and that traits thought to be under intense sexual selection are strongly influenced by phylogenetic factors.
Intrasexual selection in Mirza coquereli : evidence for scramble competition polygyny in a solitary primate
  • P. Kappeler
  • Biology
    Behavioral Ecology and Sociobiology
  • 1997
TLDR
It is indicated that these solitary lemurs are clearly subject to intrasexual selection and that male-male competition is primarily, but not exclusively, of the scramble type, and that social systems of solitary primates are more diverse than previously thought.
The Evolution of Hornedness in Female Ruminants
TLDR
Four previous explanations for female hornedness are compared with a new hypothesis, the Female Competition Hypothesis, which suggests that horns initially evolved for reasons of intrasexual competition for resources with con-specifics, the level of competition being correlated with female group size.
Horn Growth in Mountain Goats (Oreamnos americanus)
TLDR
While sexual dimorphism in body mass of mountain goats increases until at least 5 years of age, most dimorphicism in horn growth is achieved by 2 years ofAge, therefore, body weight may be a more important factor than horn size for male mating success.
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 20 REFERENCES
The Social Organisation of Antelope in Relation To Their Ecology
TLDR
The paper describes different feeding styles among antelope, in terms of selection of food items and coverage of home ranges, and argues that these feeding styles bear a relationship to maximum group size of feeding animals through the influence of dispersion ofFood items upon group cohesion.
The Functions of Antlers
TLDR
The absence of unequivocal support for the importance of antlers in defence against predators, in heat regulation, in assessment between rivals and in attracting mates leaves open the possibility that, despite their bizarre appearance, antlers evolved as weapons and are retained by selection because of their function in intra-specific combat.
The Evolution of Horn-Like Organs
TLDR
Hornlike organs evolved independently in a number of mammalian families to function as weapons inflicting damage; as defense organs shielding their owner; as binding organs allowing opponents a secure lock in battle; as display organs having an a priori intimidating effect on certain conspecifics.
Comparison and adaptation
TLDR
It is argued that adaptation should be defined by its effects rather than by its causes as any difference between two phenotypic traits (or trait complexes) which increases the inclusive fitness of its carrier.
Social organization and ecology of the klipspringer (oreotragus oreotragus) in Ethiopia.
TLDR
Der Klippspringer wurde in drei Gebieten in Athiopien beobachtet, und die weiblichen Jungen bleiben langer darin, und einige paaren sich mit ihrem Vater.
"J."
however (for it was the literal soul of the life of the Redeemer, John xv. io), is the peculiar token of fellowship with the Redeemer. That love to God (what is meant here is not God’s love to men)
I thank the museums (17) for access to collections; the Government of Tanzania for permission to conduct research; the Serengeti Wildlife Research Institute
  • 1983
The Mammalian Radiations
  • (Univ. of Chicago Press, Chicago,
  • 1981
...
1
2
...