Alpha Male Capuchins (Cebus capucinus imitator) as Keystone Individuals

2018 ◽  
pp. 91-115 ◽  
Author(s):  
Katharine M. Jack ◽  
Linda M. Fedigan
Keyword(s):  
Cebus Capucinus ◽  
Alpha Male

The Demographic and Reproductive Context of Male Replacements in Cebus Capucinus

Behaviour ◽  
2004 ◽  
Vol 141 (6) ◽  
pp. 755-775 ◽  
Author(s):  
Katharine Jack ◽  
Linda Marie Fedigan
Keyword(s):  
Group Composition ◽  
Study Groups ◽  
Cebus Capucinus ◽  
Lower Proportion ◽  
Adult Males ◽  
Alpha Male ◽  
Term Study ◽  
Annual Peak ◽  
Long Term Study

AbstractMale primates may immigrate into groups by peacefully joining the residents and taking up low-ranking positions in the hierarchy, or they may enter by force, challenging the resident males and attempting to drive them from high rank or from the group. Here we address the questions of how, when, and why immigrating male white-faced capuchins (C. capucinus) at Santa Rosa replace the former resident males of our groups, rather than simply joining them. We present data on 15 male replacements in 6 study groups tracked from 1984 through March 2004. During 11 aggressive takeovers, resident males were nearly always outnumbered by coalitions of invading males; lone resident males were particularly vulnerable. Both residents and invaders were wounded and infants often perished during or soon after takeovers. Male replacements also occur when resident males abandon their groups and males from neighboring groups 'waltz in' to become resident. Three such 'waltz in' replacements occurred during the study period. If we combine takeovers with 'waltz in' cases, replacements occur about every 4 years in our study groups, almost invariably during the dry season months of January to April, about 3-6 months before the annual peak in conceptions. In the years that groups are subject to takeovers, group composition includes significantly lower proportions of adult males than in no-takeover years. We conclude that: (1) the mechanism of male replacement is usually aggressive takeover, but sometimes abandonment of the group by prior resident males occurs; and (2) aggressive takeovers are more likely to happen when the group is vulnerable because it has a lower proportion of adult males, particularly when all co-resident males have emigrated, leaving only the alpha male in residence. Our long-term study shows that adult males need coalition partners not only to gain entry to a group but also to maintain their membership within it.

Fuggedaboutit: Alpha male linguistics

2008 ◽  
Author(s):  
Conrad McCallum
Keyword(s):  
Alpha Male

Alpha male

2001 ◽  
Author(s):  
Keyword(s):  
Alpha Male

scholarly journals STUDIES ON EXPERIMENTAL PNEUMONIA

1920 ◽  
Vol 32 (6) ◽  
pp. 719-744 ◽  
Author(s):  
Russell L. Cecil ◽  
Francis G. Blake
Keyword(s):  
Respiratory Tract ◽  
Lower Respiratory Tract ◽  
Acute Inflammation ◽  
Early Stage ◽  
Acute Stage ◽  
Cebus Capucinus ◽  
Upper Respiratory Tract ◽  
Upper Respiratory ◽  
Lymphoid Structures ◽  
Nose And Throat

1. Virulent influenza bacilli, when injected into the nose and throat of monkeys (Cebus capucinus and Macacus syrichtus), excite an acute inflammation of the upper respiratory tract, characterized by swelling and hyperemia of the mucous membrane, infiltration of the mucosa and subrnucosa with leucocytes, desquamation of epithelial cells, and the production of a mucopurulent exudate. The accessory sinuses are often implicated in the infection. 2. Experimental Bacillus influenzæ infections of the upper respiratory tract are frequently accompanied or followed by bronchiolitis, peribronchial infiltration, and bronchopneumonia with hemorrhage and edema in the early stage, emphysema and bronchiectasis in the later stages. In general, the process closely resembles uncomplicated Bacillus influenzæ pneumonia in man. 3. The injection of virulent influenza bacilli directly into the trachea of monkeys induces in them an experimental bronchiolitis and hemorrhagic bronchopneumonia, similar in all respects to spontaneous Bacillus influenzæ pneumonia. 4. In experimental Bacillus influenzæinfections of either the upper or lower respiratory tract the influenza bacillus can usually be recovered during .the acute stage by culture, either pure or in association with other bacteria. 5. In experimental Bacillus influenzæ infections in monkeys characteristic changes occur in the thymus gland—hyperplasia of the follicles, distention of the lymphatic channels, and infiltration of the parenchyma with leucocytes. This enlargement appears to be merely part of a general hyperplasia of the lymphoid structures in the cervical and thoracic regions.

scholarly journals Coyote, Canis latrans, Predation on a Bison, Bison bison, Calf in Yellowstone National Park

2009 ◽  
Vol 123 (3) ◽  
pp. 260 ◽  
Author(s):  
J. W. Sheldon ◽  
Gregory Reed ◽  
A. Cheyenne Burnett ◽  
Kevin Li ◽  
Robert L. Crabtree
Keyword(s):  
Adult Male ◽  
Yellowstone National Park ◽  
National Park ◽  
Canis Latrans ◽  
Bison Bison ◽  
Alpha Male ◽  
Complete Observation

We observed a single adult male Coyote (Canis latrans) kill a Bison (Bison bison) calf in Yellowstone National Park. The predation is, to our knowledge, the only direct and complete observation of a lone Coyote capturing and killing a Bison calf. The bison calf had unsuccessfully attempted to ford a river with a group and subsequently become stranded alone in the territory of a six-year-old alpha male Coyote.

Sign in / Sign up

Export Citation Format

Share Document