Search Results - "STEWART, IAN R. K."

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    Heterozygosity predicts clutch and egg size but not plasticity in a house sparrow population with no evidence of inbreeding by WETZEL, DANIEL P., STEWART, IAN R. K., WESTNEAT, DAVID F.

    Published in Molecular ecology (01-01-2012)
    “…We investigated the link between heterozygosity and the reaction norm attributes of reproductive performance in female house sparrows (Passer domesticus). We…”
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    EXTRA-PAIR PATERNITY IN BIRDS: Causes, Correlates, and Conflict by Westneat, David F, Stewart, Ian R.K

    “…Extra-pair paternity (EPP) is extremely variable among species of birds, both in its frequency and in the behavioral events that produce it. A flood of field…”
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    TESTS OF ECOLOGICAL, PHENOTYPIC, AND GENETIC CORRELATES OF EXTRA-PAIR PATERNITY IN THE HOUSE SPARROW by Stewart, Ian R. K, Hanschu, Richard D, Burke, Terry, Westneat, David F

    Published in The Condor (Los Angeles, Calif.) (01-05-2006)
    “…We performed a two-year study of extra-pair paternity in the House Sparrow (Passer domesticus) to test a suite of hypotheses relating to ecological factors…”
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    Complex Interactions among Temporal Variables Affect the Plasticity of Clutch Size in a Multi-Brooded Bird by Westneat, David F., Stewart, Ian R. K., Hatch, Margret I.

    Published in Ecology (Durham) (01-05-2009)
    “…Phenotypic plasticity is a widespread phenomenon and may have important influences on evolutionary processes. Multidimensional plasticity, in which multiple…”
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    Dietary Calcium, But Not a Glutathione Inhibitor, Affects Bib Size in Juvenile Male House Sparrows by Stewart, Ian R. K, Westneat, David F

    Published in The Condor (Los Angeles, Calif.) (01-11-2013)
    “…We tested whether the expression of melanin-based plumage traits reflects their bearer's levels of circulating antioxidants by repeatedly injected molting…”
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    Food Supplementation and Extrapair Paternity in House Sparrows by Stewart, Ian R. K., Westneat, David F., Barrick, Rebecca L.

    Published in The American midland naturalist (01-10-2015)
    “…We tested whether food availability affects extrapair paternity in House Sparrows (Passer domesticus) by providing supplemental food at their nests during some…”
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    PATTERNS OF SEX RATIO VARIATION IN HOUSE SPARROWS by Westneat, David F, Stewart, Ian R. K, Woeste, Emily Halpin, Gipson, Johnny, Abdulkadir, Latifat, Poston, Joseph P

    Published in The Condor (Los Angeles, Calif.) (01-08-2002)
    “…PCR amplification of a sex-linked gene was used to assay the sex ratio of nestling House Sparrows (Passer domesticus) from five consecutive breeding seasons…”
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    EXTRAPAIR PATERNITY INCREASES VARIABILITY IN MALE REPRODUCTIVE SUCCESS IN THE CHESTNUT-SIDED WARBLER (DENDROICA PENSYLVANICA), A SOCIALLY MONOGAMOUS SONGBIRD by Byers, Bruce E, Mays, Herman L, Stewart, Ian R. K, Westneat, David F

    Published in The Auk (01-07-2004)
    “…A monogamous mating system that includes extrapair fertilization can potentially generate higher variability in male reproductive success than monogamy without…”
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    Dietary Calcium Negatively Affects the Size of a Status Signal in Juvenile Male House Sparrows (Passer domesticus) by Stewart, Ian R. K., Westneat, David F.

    Published in The Auk (01-07-2010)
    “…The production of some types of signals is often assumed to be cost-free, yet we know relatively little about the factors that affect signal development. In…”
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    The Links Between Plumage Variation and Nest Site Occupancy in Male House Sparrows by Morrison, Emily B, Kinnard, Tria B, Stewart, Ian R. K, Poston, Joseph P, Hatch, Margret I, Westneat, David F

    Published in The Condor (Los Angeles, Calif.) (01-05-2008)
    “…We examined patterns of nest site occupancy in male House Sparrows (Passer domesticus) to determine if the factors influencing nest site ownership are…”
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    Patterns of hatching failure in the house sparrow Passer domesticus by Stewart, Ian R. K, Westneat, David F

    Published in Journal of avian biology (2013)
    “…Hatching failure is widespread in birds despite presumably strong selection against any wasted reproductive effort and yet there have been few attempts at…”
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    Dietary amino acids influence plumage traits and immune responses of male house sparrows, Passer domesticus, but not as expected by Poston, Joseph P., Hasselquist, Dennis, Stewart, Ian R.K., Westneat, David F.

    Published in Animal behaviour (01-11-2005)
    “…Traits that influence social interactions (signals) are widely thought to be honest indicators of some underlying quality of their bearer. One hypothesis is…”
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    Extra-pair paternity among Great Tits Parus major following manipulation of male signals by Otter, Ken A., Stewart, Ian R. K., McGregor, Peter K., Terry, Andrew M. R., Dabelsteen, Torben, Burke, Terry

    Published in Journal of avian biology (01-12-2001)
    “…Female Great Tits are known to eavesdrop on the singing behaviour of males. It is unknown, however, whether manipulation of these signals is sufficient to…”
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    Distribution of chewing lice upon the polygynous peacock Pavo cristatus by Stewart, I.R.K. (University of Leicester, Leicester, UK.), Clark, F, Petrie, M

    Published in The Journal of parasitology (01-04-1996)
    “…An opportunistic survey of louse distribution upon the peacock Pavo cristatus was undertaken following a cull of 23 birds from an English zoo. After complete…”
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    Contrasting levels of extra-pair paternity in mainland and island populations of the house sparrow (Passer domesticus): is there an 'island effect'? by GRIFFITH, SIMON C., STEWART, IAN R. K., DAWSON, DEBORAH A., OWENS, IAN P. F., BURKE, TERRY

    Published in Biological journal of the Linnean Society (01-09-1999)
    “…Despite the many studies that have investigated the genetic mating system of socially monogamous birds, very little is known about the underlying causes of…”
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