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| Author | Frank S. A. | ||||
| Title | Policing and group cohesion when resources vary. | Type | Journal Article | ||
| Year | 1996 | Publication | Animal Behaviour | Abbreviated Journal | Anim. Behav. |
| Volume | 52 | Issue | Pages | 1163-1169 | |
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| Abstract | The transition from competing individuals to cooperative groups has occurred several times inevolutionary history. The puzzle is why selfish individuals did not subvert cohesive group behaviour bytaking resources without contributing to the group’s overall success. Kin selection and reciprocal altruism are the two standard explanations for group cohesion. But many groups have evolved into cooperative units when relatedness was low and opportunities were limited for the strategic alliances required for reciprocity. A new theory was recently proposed in which individuals invest some of their resources into repressing competition between group members. Such policing increases the fair distribution of resources in the group and enhances group cohesion. The surprising aspect of this theory is that low relatedness is more conducive to the spread of policing traits than is high relatedness. Here a new explanation is developed of the biological processes that favour policing. The model is then extended in two ways. First, more realism is added to the theory by accounting for the full range of costs and benefits associated with competitive and cooperative traits within groups. Second, another surprising result is introduced about cooperative evolution. Small variations in individual vigour or resources can lead to large variations in individual contributions to policing the group. Stronger individuals often invest all of their excess resources into policing, but weaker individuals do not contribute to group cohesion. |
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5429 | ||
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| Author | Salmivalli, C.; Lagerspetz, K.; Björkqvist, K.; Österman, K.; Kaukiainen, A. | ||||
| Title | Bullying as a group process: Participant roles and their relations to social status within the group | Type | Journal Article | ||
| Year | 1996 | Publication | Aggressive Behavior | Abbreviated Journal | Aggr. Behav. |
| Volume | 22 | Issue | 1 | Pages | 1-15 |
| Keywords | aggressive behavior; peer relations; roles; social acceptance; social groups; victimization | ||||
| Abstract | Bullying was investigated as a group process, a social phenomenon taking place in a school setting among 573 Finnish sixth-grade children (286 girls, 287 boys) aged 12–13 years. Different Participant Roles taken by individual children in the bullying process were examined and related to a) self-estimated behavior in bullying situations, b) social acceptance and social rejection, and c) belongingness to one of the five sociometric status groups (popular, rejected, neglected, controversial, and average). The Participant Roles assigned to the subject were Victim, Bully, Reinforcer of the bully, Assistant of the bully, Defender of the victim, and Outsider. There were significant sex differences in the distribution of Participant Roles. Boys were more frequently in the roles of Bully, Reinforcer and Assistant, while the most frequent roles of the girls were those of Defender and Outsider. The subjects were moderately well aware of their Participant Roles, although they underestimated their participation in active bullying behavior and emphasized that they acted as Defenders and Outsiders. The sociometric status of the children was found to be connected to their Participant Roles. © 1996 Wiley-Liss, Inc. | ||||
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| Publisher | Wiley Subscription Services, Inc., A Wiley Company | Place of Publication | Editor | ||
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| ISSN | 1098-2337 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5435 | ||
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| Author | Nishida, T.; Hosaka K. | ||||
| Title | Coalition strategies among adult male chimpanzees of the Mahale Mountains, Tanzania. | Type | Book Chapter | ||
| Year | 1996 | Publication | Great Ape Societies. | Abbreviated Journal | |
| Volume | Issue | Pages | 114-135 | ||
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| Publisher | Cambridge University Press | Place of Publication | Cambridge | Editor | McGrew, W. C.; Marchant, L. F.; Nishida, T. |
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5470 | ||
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| Author | Pollard, J.C.; Littlejohn, R.P. | ||||
| Title | The effects of pen size on the behaviour of farmed red deer stags confined in yards | Type | Journal Article | ||
| Year | 1996 | Publication | Applied Animal Behaviour Science | Abbreviated Journal | Appl. Anim. Behav. Sci. |
| Volume | 47 | Issue | 3-4 | Pages | 247-253 |
| Keywords | Red deer; Handling; Density; Aggression; Farming | ||||
| Abstract | To determine whether pen size affected the behaviour and welfare of farmed red deer confined temporarily in yards, four groups of ten 2-year-old stags were confined for 40 min or 2 days in each of spring and summer, in either large (5 m × 4 m ) or small (2.5 m × 4) pens. In the small pens, wall pacing and vertical/horizontal head movements at the walls were more frequently observed (P < 0.05) and were carried out by a greater percentage of the deer (P < 0.001), and distances between individuals were smaller (P < 0.01), than observations in the large pens. Aggressive activities varied seasonally, with head-butting and chasing being seen most frequently in the spring (P < 0.05) and biting and kicking being seen most frequently in the summer (P < 0.05), and the overall frequency of aggressive activities was low in summer. In spring, in small pens there were fewer threats to head-butt, head butts by moving animals, and less stepping activity than in large pens (P < 0.05). In summer, in small pens there were more threats to butt and more stepping activity than in the large pens (P < 0.05). In both seasons, aggressive activities were correlated with wall pacing (r = 0.58 and 0.55, respectively). It was concluded that the effect of pen size on the frequency and nature of aggressive and other activities varied seasonally. In order minimise aggression and stepping activity, small pens were favoured in spring and large pens were favoured in summer. However, in both seasons there were greater inter-individual distances and reduced pacing and head movements at the walls in large pens. This latter finding may indicate that the large pens were less aversive to the deer, regardless of season. | ||||
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| ISSN | 0168-1591 | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5472 | ||
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| Author | Beerda, B.; Schilder, M.B.H.; Janssen, N.S.C.R.M.; Mol, J.A. | ||||
| Title | The Use of Saliva Cortisol, Urinary Cortisol, and Catecholamine Measurements for a Noninvasive Assessment of Stress Responses in Dogs | Type | Journal Article | ||
| Year | 1996 | Publication | Hormones and Behavior | Abbreviated Journal | Horm. Behav. |
| Volume | 30 | Issue | 3 | Pages | 272-279 |
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| Abstract | A problem in assessing animal welfare is that collecting data in itself may be stressful to the animals. Therefore, noninvasive methods for collecting data have to be devised and tested. A first step in investigating saliva cortisol, urinary cortisol, and urinary catecholamine as noninvasive indicators of canine well-being is the validation of these hormonal measures as alternatives for those in plasma. Using a model of insulin (0.2 U/kg)-induced hypoglycemia, we report on stress-induced responses in saliva cortisol, urinary cortisol, and urinary catacholamines relative to cortisol and catecholamine responses in plasma. Hypoglycemia in six dogs induced significant (P< 0.05) increases in plasma cortisol and adrenaline but not noradrenaline. Saliva cortisol responses expressed as net area under the response curve correlated significantly with plasma cortisol responses (r> 0.92). Saliva cortisol levels measured 7 to 12% of plasma cortisol concentrations. Cortisol/creatinine ratios in urine were significantly higher when voided after insulin administeration, compared to when voided after saline treatment. Insulin-induced increments in cortisol/creatinine ratios were nonsignificant when urine samples were assayed after dichloromethane extraction. Although urinary adrenaline/creatinine (A/C) ratios were significantly correlated with maximum plasma adrenaline values after insulin administration, A/C ratios did not differ significantly between insulin and saline treatment. The present experiment provides strong support for using saliva sampling and urine collection as noninvasive methods to establish stress-induced cortisol responses. For measuring acute plasma adrenaline responses, measuring A/C ratios may not be a valid alternative. | ||||
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| ISSN | 0018-506x | ISBN | Medium | ||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5574 | ||
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| Author | Tomasello, M. | ||||
| Title | Do apes ape? | Type | Book Chapter | ||
| Year | 1996 | Publication | Social learning in animals: the roots of culture | Abbreviated Journal | |
| Volume | Issue | Pages | 319-346 | ||
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| Publisher | Academic Press | Place of Publication | London | Editor | Heyes, C. M.; Galef, B.G. |
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 5600 | ||
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| Author | Kruska, D. | ||||
| Title | The effect of domestication on brain size and composition in the mink (Mustela vison) | Type | Journal Article | ||
| Year | 1996 | Publication | J Zool | Abbreviated Journal | |
| Volume | 239 | Issue | Pages | ||
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ Kruska1996 | Serial | 6234 | ||
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| Author | Meriggi,A.; Lovari, S. | ||||
| Title | A Review of Wolf Predation in Southern Europe: Does the Wolf Prefer Wild Prey to Livestock? | Type | Journal Article | ||
| Year | 1996 | Publication | Journal of Applled Ecology | Abbreviated Journal | J. Appl. Ecol |
| Volume | 33 | Issue | Pages | 1561-1571 | |
| Keywords | Canis lupus, conservation, food habits, prey abundance, prey availability. | ||||
| Abstract | 1. The recent recovery of the wolf in southern Europe has not yet removed the risk of local extinction. Wolf populations are fragmented and often comprise fewer than 500 individuals. In North America, northern and eastern Europe, wolves feed maiiily on wild herbivores. In southern Europe, this canid has apparently adapted to feed also on fruit, rubbish, livestock, small and medium-size mammals. 2. The main conservation problem lies with predation o n domestic ~ingulates,w liich leads to extensive killing of wolves. The reintroduction of wild large herbivores has been advocated as a means of reducing attacks on livestock, but predatiori on the latter may remain high if domestic ungulates are locally abundant. 3. Our synthesis of 15 studies, published in the last 15 years, on food habits of the wolf in southern Europe, has shown that ungulates have been the main diet component overall. A significant inverse correlation was found between the occurrence (%) of wild and domestic ungulates in the diet. The presence of relatively few wild ungulate species was necessary to reduce predation on livestock. 4. Selection of wild and domestic ungulate prey was influenced mainly by their local abundance, but also by their accessibility. Feeding dependence on rubbish was local and rare. In Italy, the consumption of riibbish/fruit and that of ungulates was significantly negatively correlated. Diet breadth increased as the presence of large prey in tlie diet decreased. 5. The simultaneous reintroduction of severa1 wild ungulate species is likely to reduce predation on livestock and may prove to be one of the most effective conservation measures. |
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| Notes | Approved | no | |||
| Call Number | Equine Behaviour @ team @ | Serial | 6387 | ||
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| Author | Grubb, T.L.; Foreman, J.H.; Benson, G.J.; Thurmon, J.C.; Tranquilli, W.J.; Constable, P.D.; Olson, W.O.; Davis, L.E. | ||||
| Title | Hemodynamic effects of calcium gluconate administered to conscious horses | Type | Journal Article | ||
| Year | 1996 | Publication | Journal of veterinary internal medicine / American College of Veterinary Internal Medicine | Abbreviated Journal | J Vet Intern Med |
| Volume | 10 | Issue | 6 | Pages | 401-404 |
| Keywords | Animals; Blood Pressure/drug effects/physiology; Calcium/blood; Calcium Gluconate/administration & dosage/*pharmacology; Cardiac Output/drug effects/physiology; Consciousness/*physiology; Dose-Response Relationship, Drug; Female; Heart Rate/drug effects/physiology; Hemodynamic Processes/*drug effects/physiology; Horses/blood/*physiology; Infusions, Intravenous; Male; Myocardial Contraction/drug effects/physiology; Respiration/drug effects/physiology; Stroke Volume/drug effects/physiology; Time Factors | ||||
| Abstract | Calcium gluconate was administered to conscious horses at 3 different rates (0.1, 0.2, and 0.4 mg/kg/min for 15 minutes each). Serum calcium concentrations and parameters of cardiovascular function were evaluated. All 3 calcium administration rates caused marked increases in both ionized and total calcium concentrations, cardiac index, stroke index, and cardiac contractility (dP/dtmax). Mean arterial pressure and right atrial pressure were unchanged; heart rate decreased markedly during calcium administration. Ionized calcium concentration remained between 54% and 57% of total calcium concentration throughout the study. We conclude that calcium gluconate can safely be administered to conscious horses at 0.1 to 0.4 mg/kg/min and that administration will result in improved cardiac function. | ||||
| Address | Department of Veterinary Clinical Medicine, University of Illinois at Urbana-Champaign, USA | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0891-6640 | ISBN | Medium | ||
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| Notes | PMID:8947873 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 97 | ||
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| Author | Turner, J.W.J.; Liu, I.K.; Kirkpatrick, J.F. | ||||
| Title | Remotely delivered immunocontraception in free-roaming feral burros (Equus asinus) | Type | Journal Article | ||
| Year | 1996 | Publication | Journal of reproduction and fertility | Abbreviated Journal | J Reprod Fertil |
| Volume | 107 | Issue | 1 | Pages | 31-35 |
| Keywords | Animals; *Animals, Wild; Contraception, Immunologic/methods/*veterinary; *Equidae; Feces/chemistry; Female; Pregnancy; Pregnancy Tests; Swine; Zona Pellucida/immunology | ||||
| Abstract | Regulation of local overpopulations of free-roaming feral equids is in demand worldwide for ecological balance and habitat preservation. Contraceptive vaccines have proven effective in feral horses, which breed seasonally, but no data are available for equids such as the burro, which is reproductively active all year round. In the present study, 27 individually identified female feral burros (Equus asinus) roaming free in Virgin Islands National Park (St John, US Virgin Islands; Lesser Antilles) were remotely treated with pig zonae pellucidae (PZP) vaccine. Between January and May, 16 burros were darted with a 1 ml emulsion of PZP plus Freund's adjuvant. Ten to twelve months later each treated burro was given a single booster injection of PZP plus adjuvant to maintain contraception through a second year. Eleven adult untreated jennies served as controls. Beginning one year after initial vaccination, these burros were monitored for pregnancy and foal production. Collection of data to determine treatment effect was not begun until 12 months after initial treatment to ensure that pregnancies existing before vaccination were not included. Pregnancy was assessed using previously validated methods for steroid metabolite measurement in fresh faecal samples. None of the PZP-treated burros produced foals between 0 and 12 months after the last inoculation. One PZP-treated burro tested positive for pregnancy at 10 months after the final inoculation. During this same period, six of 11 untreated burros tested pregnancy-positive, and four were observed with foals. There was no difference in pregnancy rates among treated, control and randomly sampled jennies between 12 and 24 months after the last inoculation. The results demonstrate that, in free-roaming feral burros that are reproductively active all year round: (1) burros can be accessed for remotely delivered PZP vaccination; (2) PZP contraception is effective; (3) PZP contraception is reversible; and (4) pregnancy can be reliably detected by faecal steroid analysis. | ||||
| Address | Department of Physiology and Molecular Medicine, Medical College of Ohio, Toledo 43699, USA | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0022-4251 | ISBN | Medium | ||
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| Notes | PMID:8699431 | Approved | no | ||
| Call Number | refbase @ user @ | Serial | 144 | ||
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