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    16 results match your criteria Brain behavior and evolution[Journal]

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    Light enough to travel or wise enough to stay? Brain size evolution and migratory behavior in birds.
    Evolution 2016 Sep 22;70(9):2123-33. Epub 2016 Aug 22.
    MTA-DE "Lendület" Behavioural Ecology Research Group, Department of Evolutionary Zoology and Human Biology, University of Debrecen, Debrecen, H-4032, Hungary.
    Brain size relative to body size is smaller in migratory than in nonmigratory birds. Two mutually nonexclusive hypotheses had been proposed to explain this association. On the one hand, the "energetic trade-off hypothesis" claims that migratory species were selected to have smaller brains because of the interplay between neural tissue volume and migratory flight. Read More

    The effect of brain size evolution on feeding propensity, digestive efficiency, and juvenile growth.
    Evolution 2015 11 19;69(11):3013-20. Epub 2015 Oct 19.
    Department of Ethology/Zoology, Stockholm University, Sweden.
    One key hypothesis in the study of brain size evolution is the expensive tissue hypothesis; the idea that increased investment into the brain should be compensated by decreased investment into other costly organs, for instance the gut. Although the hypothesis is supported by both comparative and experimental evidence, little is known about the potential changes in energetic requirements or digestive traits following such evolutionary shifts in brain and gut size. Organisms may meet the greater metabolic requirements of larger brains despite smaller guts via increased food intake or better digestion. Read More

    Artificial selection on relative brain size reveals a positive genetic correlation between brain size and proactive personality in the guppy.
    Evolution 2014 Apr 1;68(4):1139-49. Epub 2014 Feb 1.
    Department for Integrative Biology and Evolution (KLIVV), Veterinary University Vienna, Savoyenstrasse 1A, 1160 Vienna, Austria; Department of Ecology & Genetics/Animal Ecology, Uppsala University, Norbyvägen 18D, SE-75236 Uppsala, Sweden.
    Animal personalities range from individuals that are shy, cautious, and easily stressed (a "reactive" personality type) to individuals that are bold, innovative, and quick to learn novel tasks, but also prone to routine formation (a "proactive" personality type). Although personality differences should have important consequences for fitness, their underlying mechanisms remain poorly understood. Here, we investigated how genetic variation in brain size affects personality. Read More

    A model for genomic imprinting in the social brain: elders.
    Evolution 2012 May 16;66(5):1567-81. Epub 2011 Dec 16.
    School of Biological Sciences, University of London, Royal Holloway, Egham TW20 0EX, United Kingdom.
    Genomic imprinting refers to the process whereby genes are silenced when inherited via sperm or egg. The most widely accepted theory for the evolution of genomic imprinting-the kinship theory-argues that conflict between maternally inherited and paternally inherited genes over phenotypes with asymmetric effects on matrilineal and patrilineal kin results in self-imposed silencing of one of the copies. This theory was originally developed in the context of fitness interactions within nuclear families, to understand intragenomic conflict in the embryo and infant, but it has recently been extended to encompass interactions within wider social groups, to understand intragenomic conflict over the social behavior of juveniles and adults. Read More

    Large brains buffer energetic effects of seasonal habitats in catarrhine primates.
    Evolution 2012 Jan 13;66(1):191-9. Epub 2011 Sep 13.
    Anthropological Institute and Museum, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.
    Ecological factors have been shown to be important for brain size evolution. In this comparative study among catarrhine primates, we examine two different ways in which seasonality may be related to brain size. First, seasonality may impose energetic constraints on the brain because it forces animals to deal with periods of food scarcity (Expensive Brain hypothesis). Read More

    Species differences in early patterning of the avian brain.
    Evolution 2011 Mar 7;65(3):907-11. Epub 2010 Oct 7.
    Department of Neurobiology and Behavior, University of California, Irvine (UCI), California 92697, USA.
    The telencephalon is proportionately larger in parrots than in galliformes (chicken-like birds), whereas the midbrain tectum is proportionately smaller. We here test the hypothesis that the adult species difference in midbrain proportion is due to an evolutionary change in early brain patterning. In particular, we compare the size of the early embryonic midbrain between parakeets (Melopsittacus undulatus) and bobwhite quail (Colinus virgianus) by examining the expression domains of transcription factors Pax6 and Gbx2, which are expressed in the forebrain and hindbrain, respectively. Read More

    A model for genomic imprinting in the social brain: adults.
    Evolution 2011 Feb 29;65(2):462-75. Epub 2010 Sep 29.
    Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee 37996, USA.
    Genomic imprinting refers to genes that are silenced when inherited via sperm or via egg. The silencing of genes conditional upon their parental origin requires an evolutionary explanation. The most widely accepted theory for the evolution of genomic imprinting-the kinship theory-argues that conflict between maternally inherited and paternally inherited genes over phenotypes with asymmetric effects on matrilineal and patrilineal kin results in self-imposed silencing of one of the copies. Read More

    A model for genomic imprinting in the social brain: juveniles.
    Evolution 2010 Sep;64(9):2587-600
    Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN 37996, USA.
    What are imprinted genes doing in the adult brain? Genomic imprinting is when a gene's expression depends upon parent of origin. According to the prevailing view, the "kinship theory" of genomic imprinting, this effect is driven by evolutionary conflicts between genes inherited via sperm versus egg. This theory emphasizes conflicts over the allocation of maternal resources, and focuses upon genes that are expressed in the placenta and infant brain. Read More

    Sex chromosome linkage of mate preference and color signal maintains assortative mating between interbreeding finch morphs.
    Evolution 2010 May 17;64(5):1301-10. Epub 2009 Nov 17.
    Department of Brain, Behaviour and Evolution, Macquarie University, Sydney, NSW 2109, Australia.
    Assortative mating is a key aspect in the speciation process because it is important for both initial divergence and maintenance of distinct species. However, it remains a challenge to explain how assortative mating evolves when diverging populations are undergoing gene flow (e.g. Read More

    Phylogenetic analysis of the ecology and evolution of mammalian sleep.
    Evolution 2008 Jul;62(7):1764-76
    Evolutionary Anthropology Research Group, Department of Anthropology, Durham University, DH1 3HN Durham, UK.
    The amount of time asleep varies greatly in mammals, from 3 h in the donkey to 20 h in the armadillo. Previous comparative studies have suggested several functional explanations for interspecific variation in both the total time spent asleep and in rapid-eye movement (REM) or "quiet" (non-REM) sleep. In support of specific functional benefits of sleep, these studies reported correlations between time in specific sleep states (NREM or REM) and brain size, metabolic rate, and developmental variables. Read More

    Evidence for coevolution of sociality and relative brain size in three orders of mammals.
    Evolution 2007 Dec 1;61(12):2811-21. Epub 2007 Oct 1.
    The Macaulay Institute, Craigiebuckler, Aberdeen AB15 8QH, Scotland, United Kingdom.
    As the brain is responsible for managing an individual's behavioral response to its environment, we should expect that large relative brain size is an evolutionary response to cognitively challenging behaviors. The "social brain hypothesis" argues that maintaining group cohesion is cognitively demanding as individuals living in groups need to be able to resolve conflicts that impact on their ability to meet resource requirements. If sociality does impose cognitive demands, we expect changes in relative brain size and sociality to be coupled over evolutionary time. Read More

    Convergence and remarkably consistent constraint in the evolution of carnivore skull shape.
    Evolution 2007 May;61(5):1251-60
    School of Biological, Earth, and Environmental Sciences, The University of New South Wales, Sydney, Australia.
    Phenotypic similarities between distantly related marsupials and placentals are commonly presented as examples of convergence and support for the role of adaptive evolution in shaping morphological and ecological diversity. Here we compare skull shape in a wide range of carnivoran placentals (Carnivora) and nonherbivorous marsupials using a three-dimensional (3-D) geometric morphometric approach. Morphological and ecological diversity among extant carnivorans is considerably greater than is evident in the marsupial order Dasyuromorphia with which they have most commonly been compared. Read More

    Behavioral drive or behavioral inhibition in evolution: subspecific diversification in Holarctic passerines.
    Evolution 2005 Dec;59(12):2669-77
    Department of Biology, McGill University, 1205 Avenue Docteur Penfield, Montréal, Québec H3A 1B1, Canada.
    Behavioral changes have long been hypothesized to be an important driver of evolutionary diversification in animals, as they expose individuals to new environmental pressures and thus favor evolutionary divergence. There have been few empirical tests of this hypothesis, however, and the mechanisms linking behavioral changes and diversification processes remain controversial. We show here that Holarctic passerines with large brain size relative to body size, a character correlated with a high propensity for behavioral changes, generally have experienced more extensive subspecific diversification. Read More

    MODELING BRAIN EVOLUTION FROM BEHAVIOR: A PERMUTATIONAL REGRESSION APPROACH.
    Evolution 1994 Oct;48(5):1487-1499
    Département de sciences biologiques, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec, Canada, H3C 3J7.
    This paper has two complementary purposes: first, to present a method to perform multiple regression on distance matrices, with permutation testing appropriate for path-length matrices representing evolutionary trees, and then, to apply this method to study the joint evolution of brain, behavior and other characteristics in marsupials. To understand the computation method, consider that the dependent matrix is unfolded as a vector y; similarly, consider X to be a table containing the independent matrices, also unfolded as vectors. A multiple regression is computed to express y as a function of X. Read More

    OLFACTORY-BULB SIZE AND NOCTURNALITY IN BIRDS.
    Evolution 1990 Mar;44(2):339-346
    Department of Zoology, University of Oxford, South Parks Road, Oxford, OX1 3PS, U.K.
    Recent evidence shows that, despite earlier beliefs, many birds have a functional sense of smell. There is also considerable variation in olfactory-bulb size among bird species, yet the evolutionary significance of this variation has remained elusive. We argue that birds living under low-light conditions, where vision is less efficient, should have evolved or maintained an increased olfactory ability and, hence, larger olfactory bulbs. Read More

    LIFE HISTORY VARIATION IN PRIMATES.
    Evolution 1985 May;39(3):559-581
    Large Animal Research Group, 34A Storeys Way, Cambridge, CB3 ODT, U.K.
    Extensive variation in life-history patterns is documented across primate species. Variables included are gestation length, neonatal weight, litter size, age at weaning, age at sexual maturity, age at first breeding, longevity, and length of the estrous cycle. Species within genera and genera within subfamilies tend to be very similar on most measures, and about 85% of the variation remains when the subfamily is used as the level for statistical analysis. Read More

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