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| Author |
Janson, C.H. |
| Title |
Ecological consequences of individual spatial choice in foraging groups of brown capuchin monkeys, Cebus apella |
Type |
Journal Article |
| Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
40 |
Issue |
5 |
Pages |
922-934 |
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| Abstract |
Individuals in a foraging group of brown capuchin monkeys choose different spatial positions relative to the rest of the group. An individual's choice of spatial positiion affects its foraging success and perceived predation risk (as measured by vigilance behaviour). The two most dominant group members preferred to forage where their expected forwaging success was greatest. Juveniles chose to forage where their perceived predation risk was least, not where they would achieve the highest foraging success. The positions used by non-dominant adults neither maximized foraging success nor minimized predation risk. It is likely that subordinate adults accept spatial positions with suboptimal ecological consequences to avoid the costs of frequent confrontations with the dominant members of the group over foraging sites in poreferred positions. |
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refbase @ user @ |
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774 |
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| Author |
Thierry, B. |
| Title |
Feedback loop between kinship and dominance: the macaque model |
Type |
Journal Article |
| Year |
1990 |
Publication |
Journal of Theoretical Biology |
Abbreviated Journal |
J. Theor. Biol. |
| Volume |
145 |
Issue |
4 |
Pages |
511-522 |
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There is growing evidence that macaque social systems represent sets of coadapted traits in which strength of hierarchies and degree of nepotism covary. A framework is developed to explain the link between dominance and kinship phenomena, assuming that power brought by alliances among non-kin is allometrically related to those involving relatives. This can account for the type of social relationships observed in “despotic” systems vs. “egalitarian” ones. When social bonds are mostly founded on kinship, lineages are closed and social power generated by coalitions among relatives may reach high levels; social power frequently outweighs the fighting abilities of single individuals, and asymmetry of dominance between group members may be marked. When lineages are more open, social bonds and alliances are less kin-biased, social relationships are more equal, and as the influence of coalitions is less important, the individual retains a certain degree of freedom in relation to the power of kin-networks. Acknowledging that the balance between individual and social power is not set at the same level across different species can explain a number of variations in rules of rank inheritance and relative dominance of males and females among macaques. The framework illustrates how epigenetic processes may shape complex features of primate social systems, and offers opportunities for testing. |
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refbase @ user @ |
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867 |
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| Author |
Becker, C. D.; Ginsberg, J. R. |
| Title |
Mother-infant behaviour of wild Grevy's zebra: adaptations for survival in semidesert East Africa |
Type |
Journal Article |
| Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
40 |
Issue |
6 |
Pages |
1111-1118 |
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Mother-infant interactions and patterns of foal behaviour in the Grevy's zebra, Equus grevyi, differe from those reported for other equids. Grevy's zebra foals exhibit longer intervals between suckling bouts, do not drink water until they are 3 months old, and reach independence from the mare sooner than other equids. Furthermore, Grevy's zebra foals advance their acquisition of adult feeding behaviour. A 6-week-old Grevy's zebra foal spends as much time feeding as a 5-month-old wild horse foal. From the time their foals are born until the foals reach an age of 3 months, females form small groups (three females and their foals). These groups are never found further than 2·0 km from surface water and are usually associated with a territorial male. Unlike other equids, the foals of which always follow their mares, when female Grevy's zebra go to drink, they leave their foals in “kindergartens”, which are guarded by a single adult animal, usually a territorial male. It is proposed that many of these differences in behaviour and rates of juvenile development are the result of adaptation to an arid environment. Water requirements during early lactation appear to influence strongly the social behaviour of the Grevy's zebra and should also be a strong influence on the mother-infant behaviour of other arid-living ungulates. |
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from Professor Hans Klingels Equine Reference List |
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yes |
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927 |
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| Author |
Feh, C, |
| Title |
Long-term paternity data in relation to different aspects of rank for Camargue stallions, Equus caballus |
Type |
Journal Article |
| Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
40 |
Issue |
5 |
Pages |
995-996 |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1081 |
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| Author |
Ginsberg, J. R; Rubenstein, D. I. |
| Title |
Sperm competiton and variation in zebra mating behaviour |
Type |
Journal Article |
| Year |
1990 |
Publication |
Behavioral Ecology and Sociobiology |
Abbreviated Journal |
Behav. Ecol. Sociobiol. |
| Volume |
26 |
Issue |
6 |
Pages |
427-434 |
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Data are presented on the breeding behavior of two zebra species to test whether intra- and interspecific variation in male reproductive behavior and physiology are correlated with differences in female promiscuity. In one species, plains zebra (Equus burchelli) females live in closed membership single male groups and mate monandrously. In the other species, the Grevy's zebra (E. grevyi) females live in groups whose membership is much more temporary. Typically, associations with individual males are brief and mating is polyandrous. However, some females – those having just given birth – reside with one male for long periods, mating monandrously. These differences in female mating behavior generate variability in the potential for sperm competition. We show that behavioral differences in male investment in reproductive activities correlate with the potential for sperm competition. When mating with promiscuous mares, Grevy's zebra stallions made a greater investment in reproductive behavior (calling, mounting, ejaculations) than did stallions of either species when mating with monandrous females. The evolution of large testes size in the Grevy's zebra, when compared to the congeneric plains zebra, horse, and mountain zebra, allows for this increased investment. |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1113 |
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Klingel, H. |
| Title |
Kalameili – future home of the Przewalski horse? |
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Book Chapter |
| Year |
1990 |
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Proceedings of the 5th International Symposium on the Preservation of the Przewalski Horse, Leipzig |
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221-224 |
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Zoolog Garten |
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Leipzig |
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Seifert, S. |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1323 |
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| Author |
Rau R.E., |
| Title |
Bring back the quagga |
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1990 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1501 |
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Rutberg, A. T. |
| Title |
Inter-group transfer in assateague pony mares |
Type |
Journal Article |
| Year |
1990 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
| Volume |
40 |
Issue |
5 |
Pages |
945-952 |
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Between-previous termgroup transfernext term of adult female previous termponies,next term Equus caballus, was investigated for three consecutive summers on previous Assateaguenext Island, Maryland, U.S.A. Both the previous terminternext term-band movements of individual previous termmares and the marenext term turnover rates of one-male “harem” bands were examined. Long-term previous termtransfersnext term occurred at rates ranging from 0·06 to 0·18 per previous termmarenext term per month. previous termMaresnext term with foals transferred more frequently than previous termmaresnext term without foals, but neither female age, pregnancy, nearest-neighbour distances nor dominance rank affected the likelihood of transferring. Band turnover rates were uncorrelated with the average frequency of previous termmare-marenext term aggression within the band, but new previous termmaresnext term entering a band suffered a transient rise in aggression received. Thus, female aggression did not encourage, and may have discouraged, previous terminternext term-band previous termtransfers.next term Older stallions and stallions who had held bands for 2 years or more had significantly larger and more stable bands. Fewer previous termmarenext term turnovers were seen in bands whose stallions tended to face their previous termmares,next term showed a relatively high proportion of time feeding, and showed a relatively low proportion of time involved in aggression with other stallions, although at marginal levels of significance for all three variables. Thus, variability in stallion attributes, and possibly behaviour, probably plays the strongest role in determining previous termmare transfernext term patterns at previous termAssateague.next term |
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from Professor Hans Klingels Equine Reference List |
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yes |
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Serial |
1535 |
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| Author |
Schilder, M.B. H. |
| Title |
Interventions in a herd of semi – captive Plains zebras |
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Journal Article |
| Year |
1990 |
Publication |
Behavior |
Abbreviated Journal |
Behaviour |
| Volume |
112 |
Issue |
1-2 |
Pages |
53-83 |
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n a herd of semi-captive plains zebras interventions, which occurred within the harems, were investigated in order to answer the question why zebras interfered. These interventions are of interest because they regulate the contacts between companions and because, as corrective and preventive measures, they reveal the normative principles underlying the behaviours by which animals structure their social environment. An attempt was made to deduce 1) the internal norms of the interferer; 2) his short term aims; 3) his tactis and 4) his perception of the social environment. The analysis revealed that in the case of an affiliative interaction foals, yearlings and adult mares started to interfere if a friend had an affiliative contact with another zebra. In view of the interferer's behaviours it was concluded that their aim was to break off the ongoing interaction and that zebras tended to protect friendship bonds. Foals and yearlings further interfered if their mother was being threatened, attacked or sexually approached by a stallion. In view of the interferer's behaviours its aim was to prevent iminent interactions or to break off ongoing interactions. This suggests that these interventions were of a protective nature. The interferer's behaviours in both contexts ware very much alike. Mares tended to interfere if their foal/yearling or adult daughter was threathened or aggressed or if a mare friend was being sexually approached by a stallion. This type of intervention was of a protective nature. Stallions in a multi male harem showed a high tendency to interfere in courtship interactions. From the resemblance between interventions in courtship and in aggressive interactions it is concluded that, at leat in a number of cases, the individuals have perceived courtship behaviour by the stallion as a threat towards the mare involved. |
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1565 |
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Schilder, M.B.H. |
| Title |
Social behaviour and social arganization of a herd of plains zebra in a safari park |
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Manuscript |
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1990 |
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Ph.D. thesis |
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University of Utrecht |
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from Professor Hans Klingels Equine Reference List |
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yes |
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1566 |
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