Sexually dimorphic aggression indicates male gray wolves specialize in pack defense against conspecific groups

  title={Sexually dimorphic aggression indicates male gray wolves specialize in pack defense against conspecific groups},
  author={Kira A. Cassidy and L. David Mech and Daniel R. MacNulty and Daniel R. Stahler and Douglas W. Smith},
  journal={Behavioural Processes},

Seasonality of intraspecific mortality by gray wolves

Of 41 adult wolf-killed gray wolves (Canis lupus) and 10 probably or possibly killed by wolves from 1968 through 2014 in the Superior National Forest (SNF) in northeastern Minnesota, most were killed

Variation between species, populations, groups and individuals in the fitness consequences of out-group conflict

Out-group conflict is rife in the natural world, occurring from primates to ants. Traditionally, research on this aspect of sociality has focused on the interactions between groups and their

Post-conflict opponent affiliation reduces victim re-aggression in a family group of captive arctic wolves (Canis lupus arctos)

The hypothesis that post-conflict opponent affiliation (POA) in wolves may have been selected for as a mechanism to avoid conflict escalation, which could lead to social disruption and hence jeopardize cooperative activities is supported.

The effect of domestication on post-conflict management: wolves reconcile while dogs avoid each other

Evidence is provided for reconciliation in captive wolves, which are highly dependent on cooperation between pack members, while domestic dogs, which rely on conspecific cooperation less than wolves, avoided interacting with their partners after conflicts.

Age-based changes in kairomone response mediate task partitioning in stingless bee soldiers (Tetragonisca angustula)

This is the first study to compare behavioral responsiveness to olfactory stimuli across age-specialized soldier sub-types in a stingless bee and potentially demonstrate differentiated cue-specific responses that correspond to morphological task specialization and age polyethism in these eusocial societies.

Monogamy: Cause, Consequence, or Corollary of Success in Wild Canids?

This review asks why canids are monogamous and how monogamy is related to their success and proposes the monogamy as pro-cooperative hypothesis, suggesting four characteristics have contributed to canid success: ecological flexibility, high mobility, high reproductive rates, sociality/cooperation, and the latter two being consequences of monogamy.

Cooperative den maintenance between male Japanese badgers that are delayed dispersers and their mothers

It is found that while digging was constantly performed throughout the surveyed period, efforts in bedding gradually increased from September to February and it was found that delayed dispersers occasionally performed digging and bedding simultaneously with their mothers and siblings.

Natural Selection and Origin of a Melanistic Allele in North American Gray Wolves

Using population genetic simulations, it is shown that the K locus is undergoing natural selection in four wolf populations, and evidence for balancing selection is found in Yellowstone wolves, which could be a result of selection for enhanced immunity in response to distemper.

Heritability of inter-pack aggression in a wild pedigreed population of North American gray wolves.

The incredible utility of a pedigreed natural population for dissecting a complex, fitness-related behavioral trait is presented and strong effects of breeding status and relative pack size on aggression are found.

Fighting force and experience combine to determine contest success in a warlike mammal

How selection arising from intergroup contests may explain a suite of features of individual life history and social organization, including male eviction, sex-assortative alloparental care, and adult sex ratio is discussed.



Group composition effects on aggressive interpack interactions of gray wolves in Yellowstone National Park

Observations of aggressive interactions between wolf (Canis lupus) packs over an extended period are used and pack characteristics are used to determine which groups had an advantage over their opponents, highlighting that some individuals are more valuable than others during interpack conflicts.

Specialization for aggression in sexually dimorphic skeletal morphology in grey wolves (Canis lupus)

Sexual dimorphic functional traits identified by the analysis may be adaptive in the contexts of both natural and sexual selection, indicating the importance of aggression in the life history of male grey wolves.

Do gray wolves (Canis lupus) support pack mates during aggressive inter-pack interactions?

Each interaction where one wolf interferes when its pack mate is being attacked by a rival group is examined and discussed as it relates to the evolution of cooperation, sociality, and altruism.

Infanticide in Wolves: Seasonality of Mortalities and Attacks at Dens Support Evolution of Territoriality

Evidence for territoriality is usually correlative or post hoc as we observe the results of past selection that are challenging to detect. Wolves (Canis lupus) are considered territorial because of

Sex, rank and age differences in the Japanese macaque (Macaca fuscata yakui) participation in inter-group encounters

Data indicate that in non-territorial species with male dominance over female and high competition for mating partners males play an active, and often aggressive, role during inter-group encounter while female participation is scarce.

Contest and scramble competition: patterns of female aggression and ranging behavior among primates

Examination of the covariance of female aggression and ranging behavior among 20 species of primates in an attempt to better explain the variation in female relationships within and between groups of primates shows that groups of females are aggressive toward other groups and that home-range size increases with increasing group size in most species.

Male Aggression, Dominance and Breeding Behavior in Red Desert Feral Horses

Abstract As part of a study on feral horse social organization, habitat use and movements, observations were made on agonistic, dominance and breeding behaviors in Wyoming's Red Desert. The types of

Density-dependent intraspecific aggression regulates survival in northern Yellowstone wolves (Canis lupus).

Assessment of the effect of wolf density, prey abundance and population structure, as well as winter severity, on age-specific survival in Yellowstone National Park indicates that density-dependent intraspecific aggression is a major driver of adult wolf survival in northern Yellowstone, suggesting intrinsic density- dependent mechanisms have the potential to regulate wolf populations at high ungulate densities.

Alpha Status, Dominance, and Division of Labor in Wolf Packs

It is concluded that the typical wolf pack is a family, with the adult parents guiding the activities of the group in a division-of-labor system in which the female predominates primarily in such activities as pup care and defense and the male primarily during foraging and food-provisioning and the travels associated with them.

An offspring-defense hypothesis for territoriality in female mammals

This work proposes an alternative hypothesis that the primary function of territoriality in solitary and semi-social female mammals is to protect vulnerable young from infanticidal conspecific females.