| Records |
| Author |
Garamszegi, L.Z.; Møller, A.P.; Erritzøe, J. |
| Title |
Coevolving avian eye size and brain size in relation to prey capture and nocturnality |
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Journal Article |
| Year |
2002 |
Publication |
Proceedings of the Royal Society of London. Series B: Biological Sciences |
Abbreviated Journal |
Proc Roy Soc Lond B Biol Sci |
| Volume |
269 |
Issue |
1494 |
Pages |
961-967 |
| Keywords |
adaptation; behaviour; brain size; coevolution; eye size; vision |
| Abstract |
Behavioural adaptation to ecological conditions can lead to brain size evolution. Structures involved in behavioural visual information processing are expected to coevolve with enlargement of the brain. Because birds are mainly vision–oriented animals, we tested the predictions that adaptation to different foraging constraints can result in eye size evolution, and that species with large eyes have evolved large brains to cope with the increased amount of visual input. Using a comparative approach, we investigated the relationship between eye size and brain size, and the effect of prey capture technique and nocturnality on these traits. After controlling for allometric effects, there was a significant, positive correlation between relative brain size and relative eye size. Variation in relative eye and brain size were significantly and positively related to prey capture technique and nocturnality when a potentially confounding variable, aquatic feeding, was controlled statistically in multiple regression of independent linear contrasts. Applying a less robust, brunching approach, these patterns also emerged, with the exception that relative brain size did not vary with prey capture technique. Our findings suggest that relative eye size and brain size have coevolved in birds in response to nocturnal activity and, at least partly, to capture of mobile prey. |
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10.1098/rspb.2002.1967 |
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Equine Behaviour @ team @ |
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5452 |
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Pfister, J.A.; Stegelmeier, B.L.; Cheney, C.D.; Ralphs, M.H.; Gardner, D.R. |
| Title |
Conditioning taste aversions to locoweed (Oxytropis sericea) in horses |
Type |
Journal Article |
| Year |
2002 |
Publication |
Journal of Animal Science |
Abbreviated Journal |
J. Anim. Sci. |
| Volume |
80 |
Issue |
1 |
Pages |
79-83 |
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Locoweed (Oxytropis sericea) is a serious poisoning problem for horses grazing on infested rangelands in the western United States. Our objectives were to determine 1) whether lithium chloride or apomorphine would condition aversions to palatable foods, and at what doses, and 2) whether horses could be averted to fresh locoweed in a pen and grazing situation. Apomorphine was not an acceptable aversive agent because at the dose required to condition an aversion (> or = 0.17 mg/kg BW), apomorphine induced unacceptable behavioral effects. Lithium chloride given via stomach tube at 190 mg/kg BW conditioned strong and persistent aversions to palatable feeds with minor signs of distress. Pen and grazing tests were conducted in Colorado to determine if horses could be averted to fresh locoweed. Pen tests indicated that most horses (5/6) were completely averted from locoweed. Treated horses ate 34 g of fresh locoweed compared to 135 g for controls (P < 0.01) during three pen tests when offered 150 g per test. One horse (T) in the treatment group ate locoweed each time it was offered in the pen, but ate no locoweed while grazing. In the grazing trial, control horses averaged 8.6% of bites of locoweed (P < 0.01) during the grazing portion of the study, whereas treated horses averaged <0.5%. One treated horse (S) accounted for all consumption; he consumed 15% of his bites as locoweed in a grazing bout on d 2 of the field study. Thereafter, he was dosed a second time with lithium chloride and ate no locoweed in the subsequent 5 d. Three of six horses required two pairings of lithium chloride with fresh locoweed to condition a complete aversion. The results of this study indicate that horses can be averted from locoweed using lithium chloride as an aversive agent, and this may provide a management tool to reduce the risk of intoxication for horses grazing locoweed-infested rangeland. |
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Equine Behaviour @ team @ |
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5682 |
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Podsakoff, P.M.; MacKenzie, S. B.; Lee, J.-Y.; Podsakoff, N. P. |
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Common method biases in behavioral research: A critical review of the literature and recommended remedies. |
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Journal Article |
| Year |
2002 |
Publication |
Journal of Applied Psychology |
Abbreviated Journal |
J. Appl. Psychol. |
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85 |
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5 |
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879-903 |
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Interest in the problem of method biases has a long history in the behavioral sciences. Despite this, a comprehensive summary of the potential sources of method biases and how to control for them does not exist. Therefore, the purpose of this article is to examine the extent to which method biases influence behavioral research results, identify potential sources of method biases, discuss the cognitive processes through which method biases influence responses to measures, evaluate the many different procedural and statistical techniques that can be used to control method biases, and provide recommendations for how to select appropriate procedural and statistical remedies for different types of research settings. (PsycINFO Database Record (c) 2016 APA, all rights reserved)
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Equine Behaviour @ team @ |
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6435 |
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Murphy, M.A.; Waits, L.P.; Kendall, K.C.; Wasser, S.K.; Higbee, J.A.; Bogden, R. |
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An evaluation of long-term preservation methods for brown bear (Ursus arctos) faecal DNA samples |
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Journal Article |
| Year |
2002 |
Publication |
Conservation Genetics |
Abbreviated Journal |
Conservat. Genet. |
| Volume |
3 |
Issue |
4 |
Pages |
435-440 |
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Relatively few large-scale faecal DNA studieshave been initiated due to difficulties inamplifying low quality and quantity DNAtemplate. To improve brown bear faecal DNA PCRamplification success rates and to determinepost collection sample longevity, fivepreservation methods were evaluated: 90%ethanol, DETs buffer, silica-dried, oven-driedstored at room temperature, and oven-driedstored at -20 °C. Preservationeffectiveness was evaluated for 50 faecalsamples by PCR amplification of a mitochondrialDNA (mtDNA) locus (~146 bp) and a nuclear DNA(nDNA) locus (~200 bp) at time points of oneweek, one month, three months and six months. Preservation method and storage timesignificantly impacted mtDNA and nDNAamplification success rates. For mtDNA, allpreservation methods had >= 75% success atone week, but storage time had a significantimpact on the effectiveness of the silicapreservation method. Ethanol preserved sampleshad the highest success rates for both mtDNA(86.5%) and nDNA (84%). Nuclear DNAamplification success rates ranged from 26-88%, and storage time had a significant impacton all methods but ethanol. Preservationmethod and storage time should be importantconsiderations for researchers planningprojects utilizing faecal DNA. We recommendpreservation of faecal samples in 90% ethanolwhen feasible, although when collecting inremote field conditions or for both DNA andhormone assays a dry collection method may beadvantageous. |
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1572-9737 |
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no |
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Equine Behaviour @ team @ Murphy2002 |
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6574 |
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Byrne, R.W. |
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Imitation of novel complex actions: What does the evidence from animals mean? |
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Book Chapter |
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2002 |
Publication |
Advances in the Study of Behavior |
Abbreviated Journal |
Adv Stud Behav |
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31 |
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77-105 |
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Summary Underlying the various behaviors that are classified as imitation, there may be several distinct mechanisms, differing in adaptive function, cognitive basis, and computational power. Experiments reporting “true motor imitation” in animals do not as yet give evidence of production learning by imitation; instead, contextual imitation can explain their data, and this can be explained by a simple mechanism (response facilitation) which matches known neural findings. When imitation serves a function in social mimicry, which applies to a wide range of phenomena from neonatal imitation in humans and great apes to pair-bonding in some bird species, the fidelity of the behavioral match is crucial. Learning of novel behavior can potentially be achieved by matching the outcome of a model's action, and it is argued that vocal imitation by birds is a clear example of this method (which is sometimes called emulation). Alternatively, the behavior itself may be perceived in terms of actions that the observer can perform, and thus it may be copied. If the imitation is linear and stringlike (action level), following the surface form rather than the underlying plan, then its utility for learning new instrumental methods is limited. However, the underlying plan of hierarchically organized behavior is visible in output behavior, in subtle but detectable ways, and imitation could instead be based on this organization (program level), extracted automatically by string parsing. Currently, the most likely candidates for such capacities are all great apes. It is argued that this ability to perceive the underlying plan of action, in addition to allowing highly flexible imitation of novel instrumental methods, may have resulted in the competence to understand the intentions (theory of mind) of others. |
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Academic Press |
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San Diego |
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Snowdon, C. T.; Roper, T. J.;Rosenblatt,J. S. |
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refbase @ user @ |
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746 |
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Clow, A; Hucklebridge, F. |
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International Review of Neurobiology: Neurobiology of the Immune System |
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2002 |
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52 |
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Academic Press |
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Amsterdam |
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0-12-366853-0 |
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no |
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Equine Behaviour @ team @ |
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5782 |
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Neveu, P.J. |
| Title |
Cerebral Lateralisation and the Immune System |
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Book Chapter |
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2002 |
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International Review of Neurobiology: Neurobiology of the Immune System |
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52 |
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303-318 |
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Academic Press |
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Amsterdam |
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Clow, A.; Hucklebridge, F. |
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no |
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Equine Behaviour @ team @ |
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5828 |
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Morgan, K.; Funkquist, P.; Nyman, G. |
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The effect of coat clipping on thermoregulation during intense exercise in trotters |
Type |
Journal Article |
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2002 |
Publication |
Equine Veterinary Journal |
Abbreviated Journal |
Equine Veterinary Journal |
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34 |
Issue |
S34 |
Pages |
564-567 |
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horse; thermoregulation; heat loss; recovery; blood temperature; oxygen uptake |
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Summary The aim of this study was to study the physiological, especially thermoregulatory, responses during intense exercise in the clipped horse compared to the horse with winter coat. Six Standardbred trotters were studied before and after clipping. They performed an inclined incremental high intensity treadmill exercise test and were monitored during recovery. The clipped horse differed significantly (ANOVA) during exercise as compare to coated: less increase in central venous blood temperature, higher skin surface temperature, greater difference skin to ambient temperature and higher rate of nonevaporative heat loss. The clipped horse had significantly lower total cutaneous evaporative heat loss from walk to end of peak exercise and a shorter time for recovery for the respiratory rate using a paired t test. The clipped horse showed a tendency (P = 0.059) to decreased oxygen uptake during the stepwise increase in workload. We concluded that the clipped horse experienced less strain on the thermoregulatory system due to an enhanced heat loss. Some clipped horses in the study showed a more efficient power output; future studies with emphasis on respiration and oxygen demand are needed to explain this. |
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American Medical Association (AMA) |
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0425-1644 |
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doi: 10.1111/j.2042-3306.2002.tb05484.x |
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Equine Behaviour @ team @ |
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6614 |
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Borgatti, S.P., Everett, M.G., Freeman, L.C. |
| Title |
Ucinet for Windows: Software for Social Network Analysis |
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2002 |
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Analytic Technologies |
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Harvard, MA |
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Equine Behaviour @ team @ |
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5239 |
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Hemelrijk, C.K. |
| Title |
Understanding Social Behaviour with the Help of Complexity Science (Invited Article) |
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Journal Article |
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2002 |
Publication |
Ethology |
Abbreviated Journal |
Ethology |
| Volume |
108 |
Issue |
8 |
Pages |
655-671 |
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Abstract In the study of complexity, a new kind of explanation has been developed for social behaviour. It shows how patterns of social behaviour can arise as a side-effect of the interaction of individuals with their social or physical environment (e.g. by self-organization). This development may influence our ideas about the direct causation and evolution of social behaviour. Furthermore, it may influence our theories about the integration of different traits. This new method has been made possible by the increase in computing power. It is now applied in many areas of science, such as physics, chemistry, sociology and economics. However, in zoology and anthropology it is still rare. The major aim of this paper is to make this method more generally accepted among behavioural scientists. |
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Blackwell Verlag, GmbH |
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1439-0310 |
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Equine Behaviour @ team @ |
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5200 |
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