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| Author |
Wilson, D.A.; Stevenson, R.J. |
| Title |
The fundamental role of memory in olfactory perception |
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Journal Article |
| Year |
2003 |
Publication |
Trends in Neurosciences |
Abbreviated Journal |
Trends. Neurosci. |
| Volume |
26 |
Issue |
5 |
Pages |
243-247 |
| Keywords |
olfactory perception mammals |
| Abstract |
Current emphasis on odorant physiochemical features as the basis for perception largely ignores the synthetic and experience-dependent nature of olfaction. Olfaction is synthetic, as mammals have only limited ability to identify elements within even simple odor mixtures. Furthermore, olfaction is experience-bound, as exposure alone can significantly affect the extent to which stimuli can be discriminated. We propose that early analytical processing of odors is inaccessible at the behavioral level and that all odors are initially encoded as `objects' in the piriform cortex. Moreover, we suggest that odor perception is wholly dependent on the integrity of this memory system and that its loss severely impairs normal perception. |
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795 |
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| Author |
Keverne, E.B. |
| Title |
Olfactory learning |
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Journal Article |
| Year |
1995 |
Publication |
Current Opinion in Neurobiology |
Abbreviated Journal |
Curr. Opin. Neurobiol. |
| Volume |
5 |
Issue |
4 |
Pages |
482-488 |
| Keywords |
olfactory perception mammals |
| Abstract |
Unravelling the mechanisms of learning and memory can, and should, be tackled at many levels. Discovery of the huge family of odourant receptor genes provided olfaction with `molecular' respectability similar to that afforded to the visual system. Consequently, molecular studies have dominated the olfactory literature this past year, even to the point of providing a molecular basis of olfactory perception. Needless to say, the molecular approach favours a `hard-wired' system; however, other results suggest that flexibility in the olfactory system provides for certain adaptations that are crucial to the biological needs of mammals. |
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798 |
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| Author |
Creel, S. |
| Title |
Social dominance and stress hormones |
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Journal Article |
| Year |
2001 |
Publication |
Trends in Ecology & Evolution |
Abbreviated Journal |
Trends. Ecol. Evol |
| Volume |
16 |
Issue |
9 |
Pages |
491-497 |
| Keywords |
Dominance; rank; stress; glucocorticoids; cooperative breeding; sociality; behavioural endocrinology; mammals |
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In most cooperatively breeding birds and mammals, reproductive rates are lower for social subordinates than for dominants, and it is common for reproduction in subordinates to be completely suppressed. Early research conducted in captivity showed that losing fights can increase glucocorticoid (GC) secretion, a general response to stress. Because GCs can suppress reproduction, it has been widely argued that chronic stress might underlie reproductive suppression of social subordinates in cooperative breeders. Contradicting this hypothesis, recent studies of cooperative breeders in the wild show that dominant individuals have elevated GCs more often than do subordinates. The findings that elevated GCs can be a consequence of subordination or a cost of dominance complicate the conventional view of social stress, with broad ramifications for the evolution of dominance and reproductive suppression. |
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Equine Behaviour @ team @ |
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4072 |
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Apfelbach, R.; Blanchard, C.D.; Blanchard, R.J.; Hayes, R.A.; McGregor, I.S. |
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The effects of predator odors in mammalian prey species: A review of field and laboratory studies |
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Journal Article |
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2005 |
Publication |
Neuroscience and Biobehavioral Reviews |
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29 |
Issue |
8 |
Pages |
1123-1144 |
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Behavioral suppression; Defensive behavior; Endocrine effects; Neural effects; Predator odor; Small mammals |
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Prey species show specific adaptations that allow recognition, avoidance and defense against predators. For many mammalian species this includes sensitivity towards predator-derived odors. The typical sources of such odors include predator skin and fur, urine, feces and anal gland secretions. Avoidance of predator odors has been observed in many mammalian prey species including rats, mice, voles, deer, rabbits, gophers, hedgehogs, possums and sheep. Field and laboratory studies show that predator odors have distinctive behavioral effects which include (1) inhibition of activity, (2) suppression of non-defensive behaviors such as foraging, feeding and grooming, and (3) shifts to habitats or secure locations where such odors are not present. The repellent effect of predator odors in the field may sometimes be of practical use in the protection of crops and natural resources, although not all attempts at this have been successful. The failure of some studies to obtain repellent effects with predator odors may relate to (1) mismatches between the predator odors and prey species employed, (2) strain and individual differences in sensitivity to predator odors, and (3) the use of predator odors that have low efficacy. In this regard, a small number of recent studies have suggested that skin and fur-derived predator odors may have a more profound lasting effect on prey species than those derived from urine or feces. Predator odors can have powerful effects on the endocrine system including a suppression of testosterone and increased levels of stress hormones such as corticosterone and ACTH. Inhibitory effects of predator odors on reproductive behavior have been demonstrated, and these are particularly prevalent in female rodent species. Pregnant female rodents exposed to predator odors may give birth to smaller litters while exposure to predator odors during early life can hinder normal development. Recent research is starting to uncover the neural circuitry activated by predator odors, leading to hypotheses about how such activation leads to observable effects on reproduction, foraging and feeding. © 2005 Elsevier Ltd. All rights reserved. |
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School of Psychology, University of Sydney, Sydney, NSW 2006, Australia |
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Equine Behaviour @ team @ |
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4565 |
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Nakagawa, S.; Waas, J.R. |
| Title |
'O sibling, where art thou?' – A review of avian sibling recognition with respect to the mammalian literature |
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Journal Article |
| Year |
2004 |
Publication |
Biological Reviews of the Cambridge Philosophical Society |
Abbreviated Journal |
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79 |
Issue |
1 |
Pages |
101-119 |
| Keywords |
Birds; Direct familiarisation; Indirect familiarisation; Individual recognition; Kin discrimination; Kin recognition; Mammals; Sibling recognition |
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Avian literature on sibling recognition is rare compared to that developed by mammalian researchers. We compare avian and mammalian research on sibling recognition to identify why avian work is rare, how approaches differ and what avian and mammalian researchers can learn from each other. Three factors: (1) biological differences between birds and mammals, (2) conceptual biases and (3) practical constraints, appear to influence our current understanding. Avian research focuses on colonial species because sibling recognition is considered adaptive where 'mixing potential' of dependent young is high; research on a wider range of species, breeding systems and ecological conditions is now needed. Studies of acoustic recognition cues dominate avian literature; other types of cues (e.g. visual, olfactory) deserve further attention. The effect of gender on avian sibling recognition has yet to be investigated; mammalian work shows that gender can have important influences. Most importantly, many researchers assume that birds recognise siblings through 'direct familiarisation' (commonly known as associative learning or familiarity); future experiments should also incorporate tests for 'indirect familiarisation' (commonly known as phenotype matching). If direct familiarisation proves crucial, avian research should investigate how periods of separation influence sibling discrimination. Mammalian researchers typically interpret sibling recognition in broad functional terms (nepotism, optimal outbreeding); some avian researchers more successfully identify specific and testable adaptive explanations, with greater relevance to natural contexts. We end by reporting exciting discoveries from recent studies of avian sibling recognition that inspire further interest in this topic. |
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Department of Biological Sciences, University Waikato, Private Bag 3105, Hamilton, New Zealand |
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Cited By (since 1996): 9; Export Date: 23 October 2008; Source: Scopus |
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no |
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Equine Behaviour @ team @ |
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4567 |
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| Author |
Romero, T.; Aureli, F. |
| Title |
Reciprocity of support in coatis (Nasua nasua) |
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Journal Article |
| Year |
2008 |
Publication |
Journal of Comparative Psychology |
Abbreviated Journal |
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122 |
Issue |
1 |
Pages |
19-25 |
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*Animal Aggressive Behavior; *Animal Social Behavior; *Mammals; Reciprocity |
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Primate sociality has received much attention and its complexity has been viewed as a driving force for the evolution of cognitive abilities. Improved analytic techniques have allowed primate researchers to reveal intricate social networks based on the exchange of cooperative acts and services. Although nonprimates are known to show similar behavior (e.g., cooperative hunting, food sharing, coalitions) there seems a consensus that social life is less complex than in primates. Here the authors present the first group-level analysis of reciprocity of social interactions in a social carnivore, the ring-tailed coati (<xh:i xmlns:search=“http://marklogic.com/appservices/search” xmlns=“http://apa.org/pimain” xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” xmlns:xh=“http://www.w3.org/1999/xhtml”>Nasua nasua</xh:i>). The authors found that support in aggressive conflicts is a common feature in coatis and that this behavior is reciprocally exchanged in a manner seemingly as complex as in primates. Given that reciprocity correlations persisted after controlling for the effect of spatial association and subunit membership, some level of scorekeeping may be involved. Further studies will be needed to confirm our findings and understand the mechanisms underlying such reciprocity, but our results contribute to the body of work that has begun to challenge primate supremacy in social complexity and cognition. (PsycINFO Database Record (c) 2012 APA, all rights reserved) |
| Address |
Romero, Teresa: Living Links, Yerkes National Primate Research Center, Emory University, 954 N. Gatewood Road, Atlanta, GA, US, 30329, mromer2@emory.edu |
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American Psychological Association |
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1939-2087(Electronic);0735-7036(Print) |
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Equine Behaviour @ team @ 2008-01944-003 |
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5812 |
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Cameron, E.Z. |
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Facultative adjustment of mammalian sex ratios in support of the Trivers-Willard hypothesis: evidence for a mechanism |
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Journal Article |
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2004 |
Publication |
Proceedings. Biological sciences / The Royal Society |
Abbreviated Journal |
Proc Biol Sci |
| Volume |
271 |
Issue |
1549 |
Pages |
1723-1728 |
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Age Factors; Animals; Body Constitution; *Evolution; Female; Glucose/metabolism/physiology; Litter Size; Male; Mammals/*physiology; *Models, Biological; Reproduction/physiology; Seasons; Sex Factors; *Sex Ratio; Time Factors |
| Abstract |
Evolutionary theory predicts that mothers of different condition should adjust the birth sex ratio of their offspring in relation to future reproductive benefits. Published studies addressing variation in mammalian sex ratios have produced surprisingly contradictory results. Explaining the source of such variation has been a challenge for sex-ratio theory, not least because no mechanism for sex-ratio adjustment is known. I conducted a meta-analysis of previous mammalian sex-ratio studies to determine if there are any overall patterns in sex-ratio variation. The contradictory nature of previous results was confirmed. However, studies that investigated indices of condition around conception show almost unanimous support for the prediction that mothers in good condition bias their litters towards sons. Recent research on the role of glucose in reproductive functioning have shown that excess glucose favours the development of male blastocysts, providing a potential mechanism for sex-ratio variation in relation to maternal condition around conception. Furthermore, many of the conflicting results from studies on sex-ratio adjustment would be explained if glucose levels in utero during early cell division contributed to the determination of offspring sex ratios. |
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Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Pretoria 0002, South Africa. ezcameron@zoology.up.ac.za |
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English |
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0962-8452 |
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PMID:15306293 |
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no |
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refbase @ user @ |
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413 |
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Hardy, J.L. |
| Title |
The ecology of western equine encephalomyelitis virus in the Central Valley of California, 1945-1985 |
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Journal Article |
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1987 |
Publication |
The American Journal of Tropical Medicine and Hygiene |
Abbreviated Journal |
Am J Trop Med Hyg |
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37 |
Issue |
3 Suppl |
Pages |
18s-32s |
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Aedes/microbiology; Animals; Birds; California; Culex/microbiology; Encephalitis Virus, Western Equine/*physiology; Encephalomyelitis, Equine/*history/microbiology/transmission/veterinary; History, 20th Century; Horse Diseases/history/transmission; Horses; Humans; Insect Vectors/microbiology; Mammals |
| Abstract |
Reeves' concept of the summer transmission cycle of western equine encephalomyelitis virus in 1945 was that the virus was amplified in a silent transmission cycle involving mosquitoes, domestic chickens, and possibly wild birds, from which it could be transmitted tangentially to and cause disease in human and equine populations. Extensive field and laboratory studies done since 1945 in the Central Valley of California have more clearly defined the specific invertebrate and vertebrate hosts involved in the basic virus transmission cycle, but the overall concept remains unchanged. The basic transmission cycle involves Culex tarsalis as the primary vector mosquito species and house finches and house sparrows as the primary amplifying hosts. Secondary amplifying hosts, upon which Cx. tarsalis frequently feeds, include other passerine species, chickens, and possibly pheasants in areas where they are abundant. Another transmission cycle that most likely is initiated from the Cx. tarsalis-wild bird cycle involves Aedes melanimon and the blacktail jackrabbit. Like humans and horses, California ground squirrels, western tree squirrels, and a few other wild mammal species become infected tangentially with the virus but do not contribute significantly to virus amplification. |
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Department of Biomedical and Environmental Health Sciences, School of Public Health, University of California, Berkeley 94720 |
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0002-9637 |
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PMID:3318522 |
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no |
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Equine Behaviour @ team @ |
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2677 |
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Wang, L.Y. |
| Title |
Host preference of mosquito vectors of Japanese encephalitis |
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Journal Article |
| Year |
1975 |
Publication |
Zhonghua Minguo wei Sheng wu xue za zhi = Chinese Journal of Microbiology |
Abbreviated Journal |
Zhonghua Min Guo Wei Sheng Wu Xue Za Zhi |
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8 |
Issue |
4 |
Pages |
274-279 |
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Animals; *Behavior, Animal; Birds/blood; *Culex; Ecology; Encephalitis, Japanese/*transmission; *Feeding Behavior; Female; Humans; *Insect Vectors; Mammals/blood; Species Specificity; Taiwan |
| Abstract |
The host preference of 4 Culex mosquito species collected in Miaoli and Pingtung counties, Taiwan was studied by capillary precipitin method. Antisera to alum-precipitated sera of man, bovine, swine, rabbit, horse, dog, cat, mouse, chicken, duck, and pigeon were produced in rabbits and reacted with 758 mosquito blood meals among which reactions to one or more antisera. Culex annulus and Culex tritaeniorhynchus summorosus showed a great avidity for pig, and Culex fuscocephala for bovine. Culex pipiens fatigans was ornithophilic. None of 110 C. t. summorosus and 2.4% of 223 C. annulus had fed on man. Among 66 samples of C.p. fatigans tested 10.3% had fed on man, while none of 359 C. fuscocephala did. It seems that the latter does not act as a primary vector of Japanese encephalitis. |
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0009-4587 |
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PMID:181218 |
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Equine Behaviour @ team @ |
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2702 |
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Scherer, W.F.; Dickerman, R.W. |
| Title |
Ecologic studies of Venezuelan encephalitis virus in southeastern Mexico. 8. Correlations and conclusions |
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Journal Article |
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1972 |
Publication |
The American Journal of Tropical Medicine and Hygiene |
Abbreviated Journal |
Am J Trop Med Hyg |
| Volume |
21 |
Issue |
2 |
Pages |
86-89 |
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Animals; Birds; Cattle; Chiroptera; Cricetinae; Culex; Culicidae; *Disease Reservoirs; Ecology; Encephalitis Virus, Venezuelan Equine/immunology; Encephalitis Viruses/*isolation & purification; Encephalomyelitis, Equine/epidemiology/*etiology; Horses; Humans; *Insect Vectors; Mammals; Mexico; Mice; Opossums; Rats; Swine |
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0002-9637 |
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PMID:4399844 |
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Equine Behaviour @ team @ |
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2721 |
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