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Taberlet, P.; Waits, L.P.; Luikart, G. |
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Title |
Noninvasive genetic sampling: look before you leap |
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1999 |
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Trends in Ecology & Evolution |
Abbreviated Journal |
Trends Ecol. Evol |
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14 |
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8 |
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323-327 |
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Hairs; Feces; Feathers; Allelic dropout; Individual identification; Conservation genetics; Behavioural ecology; Pilot study; Microsatellites; Probability of identity |
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Noninvasive sampling allows genetic studies of free-ranging animals without the need to capture or even observe them, and thus allows questions to be addressed that cannot be answered using conventional methods. Initially, this sampling strategy promised to exploit fully the existing DNA-based technology for studies in ethology, conservation biology and population genetics. However, recent work now indicates the need for a more cautious approach, which includes quantifying the genotyping error rate. Despite this, many of the difficulties of noninvasive sampling will probably be overcome with improved methodology. |
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0169-5347 |
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Equine Behaviour @ team @ |
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6573 |
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Author |
Herbert Gintis; Samuel Bowles; Robert Boyd; Ernst Fehr |
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Title |
Explaining altruistic behavior in humans |
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2003 |
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Evolution and Human Behaviour |
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24 |
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3 |
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153-172 |
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Altruism; Reciprocity; Experimental games; Evolution of cooperation |
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Recent experimental research has revealed forms of human behavior involving interaction among unrelated individuals that have proven difficult to explain in terms of kin or reciprocal altruism. One such trait, strong reciprocity is a predisposition to cooperate with others and to punish those who violate the norms of cooperation, at personal cost, even when it is implausible to expect that these costs will be repaid. We present evidence supporting strong reciprocity as a schema for predicting and understanding altruism in humans. We show that under conditions plausibly characteristic of the early stages of human evolution, a small number of strong reciprocators could invade a population of self-regarding types, and strong reciprocity is an evolutionary stable strategy. Although most of the evidence we report is based on behavioral experiments, the same behaviors are regularly described in everyday life, for example, in wage setting by firms, tax compliance, and cooperation in the protection of local environmental public goods. |
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1090-5138 |
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Equine Behaviour @ team @ S1090-5138(02)00157-5 |
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4943 |
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Author |
Sih, A.; Bell, A.; Johnson, J.C. |
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Title |
Behavioral syndromes: an ecological and evolutionary overview |
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Journal Article |
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Year |
2004 |
Publication |
Trends in Ecology & Evolution |
Abbreviated Journal |
Trends. Ecol. Evol |
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19 |
Issue |
7 |
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372-378 |
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Recent studies suggest that populations and species often exhibit behavioral syndromes; that is, suites of correlated behaviors across situations. An example is an aggression syndrome where some individuals are more aggressive, whereas others are less aggressive across a range of situations and contexts. The existence of behavioral syndromes focuses the attention of behavioral ecologists on limited (less than optimal) behavioral plasticity and behavioral carryovers across situations, rather than on optimal plasticity in each isolated situation. Behavioral syndromes can explain behaviors that appear strikingly non-adaptive in an isolated context (e.g. inappropriately high activity when predators are present, or excessive sexual cannibalism). Behavioral syndromes can also help to explain the maintenance of individual variation in behavioral types, a phenomenon that is ubiquitous, but often ignored. Recent studies suggest that the behavioral type of an individual, population or species can have important ecological and evolutionary implications, including major effects on species distributions, on the relative tendencies of species to be invasive or to respond well to environmental change, and on speciation rates. Although most studies of behavioral syndromes to date have focused on a few organisms, mainly in the laboratory, further work on other species, particularly in the field, should yield numerous new insights. |
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Equine Behaviour @ team @ |
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2185 |
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Author |
Dong, D.; Jones, G.; Zhang, S. |
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Title |
Dynamic evolution of bitter taste receptor genes in vertebrates |
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Year |
2009 |
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BMC Evolutionary Biology |
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9 |
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1 |
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12 |
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Sensing bitter tastes is crucial for many animals because it can prevent them from ingesting harmful foods. This process is mainly mediated by the bitter taste receptors (T2R), which are largely expressed in the taste buds. Previous studies have identified some T2R gene repertoires, and marked variation in repertoire size has been noted among species. However, the mechanisms underlying the evolution of vertebrate T2R genes remain poorly understood. |
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1471-2148 |
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Equine Behaviour @ team @ Dong2009 |
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6637 |
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Author |
Pusey, A.E. |
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Title |
Sex-biased dispersal and inbreeding avoidance in birds and mammals |
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Year |
1987 |
Publication |
Trends in Ecology & Evolution |
Abbreviated Journal |
Trends. Ecol. Evol |
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2 |
Issue |
10 |
Pages |
295-299 |
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Sex differences in dispersal distance are widespread in birds and mammals, but the predominantly dispersing sex differs consistently between the classes. There has been persistent debate over the relative importance of two factors -- intrasexual competition and inbreeding avoidance -- in producing sex-biased dispersal, and over the sources of the difference in dispersal patterns between the two classes. Recent studies cast new light on these questions. |
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0169-5347 |
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Equine Behaviour @ team @ |
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5326 |
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Author |
Dugatkin, L.; Alfieri, M. |
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Tit-For-Tat in guppies (Poecilia reticulata): the relative nature of cooperation and defection during predator inspection |
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1991 |
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Evolutionary Ecology |
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Evol. Ecol. |
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5 |
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3 |
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300-309 |
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Game theory – Tit-For-Tat – predator inspection – guppy |
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Summary The introduction of game-theoretical thinking into evolutionary biology has laid the groundwork for a heuristic view of animal behaviour in which individuals employ “strategies” – rules that instruct them how to behave in a given circumstance to maximize relative fitness. Axelrod and Hamilton (1981) found that a strategy called Tit-For-Tat (TFT) is one robust cooperative solution to the iterated Prisoner's Dilemma game. There exists, however, little empirical evidence that animals employ TFT. Predator inspection in fish provides one ecological context in which to examine the use of the TFT strategy. |
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Equine Behaviour @ team @ |
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2177 |
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Author |
Bergmüller, R.; Taborsky, M. |
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Title |
Animal personality due to social niche specialisation |
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Journal Article |
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2010 |
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Trends in Ecology & Evolution |
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25 |
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9 |
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504-511 |
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The existence of 'animal personality', i.e. consistent individual differences in behaviour across time and contexts, is an evolutionary puzzle that has recently generated considerable research interest. Although social factors are generally considered to be important, it is as yet unclear how they might select for personality. Drawing from ecological niche theory, we explore how social conflict and alternative social options can be key factors in the evolution and development of consistent individual differences in behaviour. We discuss how animal personality research might benefit from insights into the study of alternative tactics and illustrate how selection can favour behavioural diversification and consistency due to fitness benefits resulting from conflict reduction among social partners. |
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0169-5347 |
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Equine Behaviour @ team @ |
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6646 |
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Author |
Cozzi, B.; Povinelli, M.; Ballarin, C.; Granato, A. |
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Title |
The Brain of the Horse: Weight and Cephalization Quotients |
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Journal Article |
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2014 |
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Brain, Behavior and Evolution |
Abbreviated Journal |
Brain Behav Evol |
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83 |
Issue |
1 |
Pages |
9-16 |
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The horse is a common domestic animal whose anatomy has been studied since the XVI century. However, a modern neuroanatomy of this species does not exist and most of the data utilized in textbooks and reviews derive from single specimens or relatively old literature. Here, we report information on the brain of Equus caballus obtained by sampling 131 horses, including brain weight (as a whole and subdivided into its constituents), encephalization quotient (EQ), and cerebellar quotient (CQ), and comparisons with what is known about other relevant species. The mean weight of the fresh brains in our experimental series was 598.63 g (SEM ± 7.65), with a mean body weight of 514.12 kg (SEM ± 15.42). The EQ was 0.78 and the CQ was 0.841. The data we obtained indicate that the horse possesses a large, convoluted brain, with a weight similar to that of other hoofed species of like mass. However, the shape of the brain, the noteworthy folding of the neocortex, and the peculiar longitudinal distribution of the gyri suggest an evolutionary specificity at least partially separate from that of the Cetartiodactyla (even-toed mammals and cetaceans) with whom Perissodactyla (odd-toed mammals) are often grouped. |
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0006-8977 |
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Equine Behaviour @ team @ |
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6592 |
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Author |
Ishida, N.; Oyunsuren, T.; Mashima, S.; Mukoyama, H.; Saitou, N. |
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Title |
Mitochondrial DNA sequences of various species of the genus Equus with special reference to the phylogenetic relationship between Przewalskii's wild horse and domestic horse |
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Journal Article |
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Year |
1995 |
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Journal of Molecular Evolution |
Abbreviated Journal |
J Mol Evol |
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41 |
Issue |
2 |
Pages |
180-188 |
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Animals; Base Sequence; Chromosomes; Conserved Sequence/genetics; DNA, Mitochondrial/*genetics; Evolution; Genetic Variation/*genetics; Horses/*genetics; Molecular Sequence Data; *Phylogeny; RNA, Transfer, Pro/genetics; Sequence Alignment; Sequence Analysis, DNA |
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The noncoding region between tRNAPro and the large conserved sequence block is the most variable region in the mammalian mitochondrial DNA D-loop region. This variable region (ca. 270 bp) of four species of Equus, including Mongolian and Japanese native domestic horses as well as Przewalskii's (or Mongolian) wild horse, were sequenced. These data were compared with our recently published Thoroughbred horse mitochondrial DNA sequences. The evolutionary rate of this region among the four species of Equus was estimated to be 2-4 x 10(-8) per site per year. Phylogenetic trees of Equus species demonstrate that Przewalskii's wild horse is within the genetic variation among the domestic horse. This suggests that the chromosome number change (probably increase) of the Przewalskii's wild horse occurred rather recently. |
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Laboratory of Molecular and Cellular Biology, Japan Racing Association, Tokyo |
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English |
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0022-2844 |
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PMID:7666447 |
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Equine Behaviour @ team @ |
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5042 |
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Wilson, S. D.; Clark, A. B.; Coleman, K.; Dearstyne, T. |
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Title |
Shyness and boldness in humans and other animals |
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Year |
1994 |
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Trends in Ecology & Evolution |
Abbreviated Journal |
Trends. Ecol. Evol |
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9 |
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11 |
Pages |
442-446 |
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The shy-bold continuum is a fundamental axis of behavioral variation in humans and at least some other species, but its taxonomic distribution and evolutionary implications are unknown. Models of optimal risk, density- or frequency-dependent selection, and phenotypic plasticity can provide a theoretical framework for understanding shyness and boldness as a product of natural selection. We sketch this framework and review the few empirical studies of shyness and boldness in natural populations. The study of shyness and boldness adds an interesting new dimension to behavioral ecology by focusing on the nature of continuous behavioral variation that exists within the familiar categories of age, sex and size. |
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0169-5347 |
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Equine Behaviour @ team @ |
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5161 |
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