One is that mane development is closely tied to climate because its presence significantly reduces heat loss. Tsavo males may have heightened levels of testosterone , which could also explain their reputation for aggression. West African lions are often seen with weak manes or none.
Lions in Ancient Egyptian art are usually depicted without a mane, but with a ruff around the neck. A man-eating Tsavo lion killed by Patterson.
Cave paintings from the Pleistocene epoch often depict lions [ disambiguation needed ] without manes, even if with the scrotum. From Wikipedia, the free encyclopedia. Type of male lions that can be without manes or having weak manes.
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This would be an obvious advantage to male lions in defending their prides against potential rivals. Also, a male that advertises his ability to defend a pride and its cubs should appear attractive to females. To find out how the two sexes responded to different types of manes, West, working in Serengeti National Park, set up pairs of realistic-looking dummy lions about meters from adult lions.
To test reactions to different mane length, she paired dummies with short blond or long blond manes. In separate experiments to observe reactions to mane color, she paired dummies with long blond or long dark manes. When the dummies were in place, she broadcasted recordings of a hyena at a kill--the leonine equivalent of a dinner bell--and noted reactions of the lions when they spotted the "intruders.
Given a choice between short and long manes, males approached the short-maned dummy nine out of 10 times. In the one instance where the long-maned dummy was approached, the males were relatively old, with long, dark manes.
Zoo keeper hugs lion and grooms his mane
Even then, they approached from the side; males never approached a long-maned dummy directly. When confronted with light and dark manes, males always five of five times chose to approach the light-maned dummy. Animals that can be identified with existing species emerged over a period from about 10—12 mya for ocelots to very recently, possibly within historic times. Felid social systems are relatively similar across species: Adult animals tend to be solitary except for females and their young, and amicable adult encounters tend to be connected with reproduction.
A great deal is known of the specifics of aggression in Felids, due in large part to the work of Paul Leyhausen, who worked with domesticated cats and with other felid species in captivity, at the Max Planck Institute for Behavioral Physiology, at Wuppertal. Large felids, of the genus Panthera have also been the subjects of extensive field work, which has generally affirmed Leyhausen's conclusions about conservation of many aggressive behaviors and facial expressions across felid species. Briefly, Leyhausen described intraspecific aggression in these animals as a behavior that is capable of producing great damage, as all felids have weapon systems that have evolved to facilitate their roles as predators but are used also in within-species fighting.
Leyhausen also indicated that aggression in felids is more regulated by effective defenses than responsive to the submission signals that are quite effective in reducing intra-group fighting in many canid species, such as wolves and dogs. By selecting animals and arranging situations, Leyhausen was able to polarize attack and defensive behaviors in domesticated cat subjects, or, alternatively, to maximize attack motivations for both combatants. In a highly polarized attack-defend situation, the attacker stands tall and advances directly toward the victim while emitting low growls.
As the attacker approaches contact, the defending animal may assume a contorted posture, half on its back but facing the other cat, enabling both fore- and hindpaws to be drawn up and opposed to the oncoming attacker. This stance conceals the nape, the major target site for intraspecific offensive attack. Both fore- and hindpaws may lash out at the attacker and disembowelment of the attacker is possible, particularly if it attempts to reach over to bite at the partly supine defender's nape.
However, when both animals are highly motivated to attack, a frontal approach is typically utilized by both, resulting in animals facing each other and delivering forepaw blows largely toward the head and neck of the other. Cat social systems provide a strong enabling factor in the dangerousness of aggression in these animals. Because of their solitary life-style, there is little reason for a felid under attack from a member of its own species to stay and receive bites and blows from the highly developed weapon systems that are characteristic of all felid species.
The only context in which fighting may be strongly adaptive is mating, where flight, even if successful in avoiding injury, results in a substantial reduction in a male's extended reproductive fitness. Given that felids, particularly the larger ones such as tigers and leopards, kill large prey, it might be assumed that fighting over such prey would constitute a frequent occasion for fighting. However, the solitary life-style of these animals also acts to reduce conspecific encounters over prey.
Lions are a different story. First, with the exception of the domesticated cat, which is not yet a truly separate species as it still freely interbreeds to produce fertile offspring with its wild ancestors Driscoll et al. While the earliest lion-like cat may date to the late Pliocene, cave paintings indicate that males had no manes Barnett et al. Although Yamaguchi et al.
Thus this particular mode of sociality, highly unusual for felids, may have been characteristic of Holarctic lions Panthera leo spelaea or, it may have evolved, along with the male lion's mane, only in modern lions. The classic hypothesis for a relationship between group-living and the development of manes is that manes reduce the dangers associated with fighting within lion groups Darwin, ; Ewer, ; Schaller, ; Blanchard and Blanchard, Insofar as group-living is adaptive, serious injuries resulting from fighting within the group would be maladaptive for both the attacker and the injured animal, encouraging the latter to leave the group or reducing its ability to join in protecting the group from attack by outsiders.
This is a particularly important consideration for lions, in that take-over of prides by nomadic lions entails infanticide by the new pride males Loveridge et al. A recent proliferation of nature documentaries plus the development of YouTube and other online sources has made videos of fighting in a variety of animals available. Moreover, a variety of animals and videotaping sources appear to have been involved, substantially reducing the possibility that the clips present a systematically biased view of the actual behaviors involved in serious fights in lions.
The form of both attack and defense in male lions appears to be highly consistent across these clips, particularly demonstrating the mutual frontal attack seen in other felids 1. The only time that an attacked male voluntarily exposes its back to an attacker is when it is fleeing. Even then, as the pursuer comes close, the pursued animal typically turns toward it, presenting its own weapons. Even a young cub, attacked and ultimately killed by an adult male, turns to face its attacker, flipping on its back in a move reminiscent of defensive domestic cats, as contact becomes imminent 2.
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They found that wounds were fairly evenly distributed over all four regions in females and subadults, and over three, excluding the area covered by the mane, in adult males. Moreover, females and subadults were equally likely to survive wounds to each body part. These figures are not easy to reconcile with those of Schaller who describes three direct observations of lions killing lions p.
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These examples do not indicate that other sites are not involved in attacks of one lion on another, but they do suggest that bites to the head and nape, if they reach these targets, are likely to be especially lethal. It might also be noted that wound sites do not necessarily have the same meaning as do targets: If, as in domestic cats, female and subadult lions have behavioral defenses that serve to protect the neck and shoulder by interposing teeth and claws to the attacker, a lack of disproportionate wounds on these sites may simply reflect the success of such defenses.
Indeed, if the face one of the four areas measured had a relatively even share of wounds West and Packer, even though it is much the smallest of the four areas evaluated, this may suggest that faces were wounded disproportionately to their area, perhaps in consequence of a facing defense that served to protect the neck and shoulders. At any rate, the argument that a lion's mane is protective applies to animals that have manes, i.
If such protection were equally important for females and subadult males, and this was indeed the basis on which manes have evolved, then presumably females and subadult males would have manes as well. They do not. A second finding relates to approach and avoidance responses of wild lions to dummies set up to have long or short manes, and, light or dark manes.
Females approached the dark-maned model, and the long-maned model, proportionately more than did males West and Packer, Female choice of both is consonant with findings that dark-maned males have higher testosterone levels than light-maned males, and that mane length and other aspects of quality reflect health as well as genetic differences. Male avoidance of these particular dummies may well reflect the same factors, and is also consonant with a view that mane quality provides protection against attack, providing abundantly maned lions an advantage in agonistic situations.
A particularly interesting factor in the relationship between lion manes and lion social systems is that there are two groups of lions in which males show much less abundant manes; Asian lions in the Gir forest of India, and the Tsavo lions of lowland Kenya. Due to human pressures on their habitat, the Gir lions are basically a remnant population, albeit with relatively high genetic diversity Sachdev et al.
Gir lions have substantially scantier manes than those in Africa, with the exception of the Tsavo region, while the Tsavo lions are typically characterized as maneless. Abundantly-maned male lions disproportionately overheat when the ambient temperature is high West and Packer, , strongly suggesting that the relatively poor manes of lions in both areas constitutes a direct evolutionary response to the heat-based maladaptiveness of manes in these local climates.
nnyantiques.com/3261.php Tsavo, lying between the upland plateau of Kenya and the coast, is within three degrees of the equator and has no cool months of the year. These climate factors, taken in conjunction with direct measures of overheating of lions with manes in hot weather, appear to provide a sufficient and direct explanation for the manelessness of Tsavo and Gir males.
Aggression, Social Systems and Evolution
If lion manes arise because they serve as a permissive factor in the context of multi-male prides, what happens to multi-male prides when males do not have manes? In particular, if mane reduction in these lions is an evolutionary response to long-term high heat and humidity in the environment, alterations in their social systems may be secondary to such male mane changes, i. Moreover, in only one of the two were the animals adults.
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