Search Results - "BIRKHEAD, T. R."

Polyspermy in birds: sperm numbers and embryo survival by Hemmings, N., Birkhead, T. R.

“…Polyspermy is a major puzzle in reproductive biology. In some taxa, multiple sperm enter the ovum as part of the normal fertilization process, whereas in…”
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As rare as hen's teeth: aberrantly coloured eggs of the northern lapwing (Vanellus vanellus) and the interface between oology and ornithology by Birkhead, T. R.

“…The majority of birds lay eggs of a colour and maculation "typical" of their species, but very occasionally individual females produce eggs of unusual colours…”
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Female feral fowl eject sperm of subdominant males by Pizzari, T, Birkhead, T. R

“…Paternity is often determined by competition between the ejaculates of different males. Males can also use particular behaviours or structures to manipulate…”
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A Linkage Map of the Zebra Finch Taeniopygia guttata Provides New Insights Into Avian Genome Evolution by Stapley, J, Birkhead, T. R, Burke, T, Slate, J

“…Passeriformes are the largest order of birds and one of the most widely studied groups in evolutionary biology and ecology. Until recently genomic tools in…”
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Genetic effects on sperm design in the zebra finch by Birkhead, T. R, Pellatt, E. J, Brekke, P, Yeates, R, Castillo-Juarez, H

“…Sperm design and function are important determinants of male reproductive success and are expected to be under strong selection. The way that spermatozoa…”
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Recruitment and survival of immature seabirds in relation to oil spills and climate variability by Votier, S. C., Birkhead, T. R., Oro, D., Trinder, M., Grantham, M. J., Clark, J. A., McCleery, R. H., Hatchwell, B. J.

“…1. In long-lived animals with delayed maturity, the non-breeding component of the population may play an important role in buffering the effects of stochastic…”
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Cryptic Female Choice: Criteria for Establishing Female Sperm Choice by Birkhead, T. R.

“…In this paper, I consider the criteria necessary to demonstrate the postcopulatory ability of females to favor the sperm of one conspecific male over another,…”
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Unhatched eggs: methods for discriminating between infertility and early embryo mortality by BIRKHEAD, T.R, HALL, J, SCHUT, E, HEMMINGS, N

“…Unhatched eggs are a common phenomenon in birds and are often referred to as being 'infertile', which (confusingly) can mean at least two things: (1) that the…”
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How stupid not to have thought of that: post-copulatory sexual selection by Birkhead, T.R

“…Science progresses through ideas or hypotheses; novel ways of viewing the world. If those ideas survive testing, then they are considered 'the truth', or more…”
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Sperm mobility determines the outcome of sperm competition in the domestic fowl by Birkhead, T.R, Martinez, J.G, Burke, T, Froman, D.P

“…assay, predicted the outcome of sperm competition. Thirteen pairs of New Hampshire roosters, comprising one male categorized as having high–mobility sperm and…”
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Internal incubation and early hatching in brood parasitic birds by Birkhead, T. R., Hemmings, N., Spottiswoode, C. N., Mikulica, O., Moskát, C., Bán, M., Schulze-Hagen, K.

“…The offspring of brood parasitic birds benefit from hatching earlier than host young. A proposed but little-known strategy to achieve this is ‘internal…”
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Three early books on birds' eggs: Marsili's Danubius Pannonico-Mysicus (1726), Zinanni's Delle Uova e dei Nidi degli Uccelli (1737) and Klein's Ova avium plurimarum ad naturalem magnitudinem delineata et genuinis coloribus picta (1766) by Birkhead, T. R., Pilastro, A.

“…The three earliest - all eighteenth-century - illustrated accounts of birds' eggs were by Luigi Marsili (or Marsigli): Danubius Pannonico-Mysicus, Giuseppe…”
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The sexually-selected sperm hypothesis: sex-biased inheritance and sexual antagonism by PIZZARI, T., BIRKHEAD, T. R.

“…When females are inseminated by more than one male (polyandry) sexual selection continues after insemination in the form of sperm competition and cryptic…”
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Nestling diet, secondary sexual traits and fitness in the zebra finch by Birkhead, T. R., Fletcher, F., Pellatt, E. J.

“…in vivo…”
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Evolutionary Ecology of the Prezygotic Stage by Bernasconi, G., T. -L. Ashman, Birkhead, T. R., Bishop, J. D. D., Grossniklaus, U., Kubli, E., Marshall, D. L., Schmid, B., Skogsmyr, I., Snook, R. R., Taylor, D., Till-Bottraud, I., Ward, P. I., Zeh, D. W., Hellriegel, B.

“…The life cycles of sexually reproducing animals and flowering plants begin with male and female gametes and their fusion to form a zygote. Selection at this…”
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Sperm Viability and Sperm Competition in Insects by Hunter, F.M, Birkhead, T.R

“…Sperm quality plays an important role in vertebrates in determining which male has the advantage when two or more males compete to fertilize a female's ova [1,…”
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Post‐mating reproductive barriers in two unidirectionally hybridizing sunfish (Centrarchidae: Lepomis) by IMMLER, S, HAMILTON, M.B, POSLUSNY, N.J, BIRKHEAD, T.R, EPIFANIO, J.M

“…The evolutionary sequence of events in the evolution of reproductive barriers between species is at the core of speciation biology. Where premating barriers…”
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Parthenogenesis in a passerine bird, the Zebra Finch Taeniopygia guttata by SCHUT, E., HEMMINGS, N., BIRKHEAD, T. R.

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DEFINING AND DEMONSTRATING POSTCOPULATORY FEMALE CHOICE—AGAIN by Birkhead, T. R

“…Birkhead's motivation for writing about the criteria for detecting one form of cryptic female choice, female sperm choice, was twofold: to stimulate discussion…”
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evolution of sperm morphometry in pheasants by IMMLER, S, SAINT-JALME, M, LESOBRE, L, SORCI, G, ROMAN, Y, BIRKHEAD, T.R

“…Post-copulatory sexual selection is thought to be a potent evolutionary force driving the diversification of sperm shape and function across species. In birds,…”
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