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Sunday, August 2, 2020 | History

2 edition of effect of light intensity and day length on reproduction in the English sparrow. found in the catalog.

effect of light intensity and day length on reproduction in the English sparrow.

George A. Bartholomew

effect of light intensity and day length on reproduction in the English sparrow.

by George A. Bartholomew

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  • 5 Currently reading

Published by The Museum in Cambridge .
Written in English

    Subjects:
  • English sparrow -- Reproduction -- Effect of light on.,
  • Photoperiodism.

  • Edition Notes

    Bibliography: p. 473-476.

    SeriesBulletin of the Museum of Comparative Zoölogy at Harvard College,, v. 101, no. 3, Bulletin of the Museum of Comparative Zoology ;, v. 101, no. 3.
    Classifications
    LC ClassificationsQL1 .H3 vol. 101, no. 3
    The Physical Object
    Pagination[433]-476 p.
    Number of Pages476
    ID Numbers
    Open LibraryOL195078M
    LC Control Numbera 49004135
    OCLC/WorldCa30407063

      Maaike de Jong, Samuel P. Caro, Phillip Gienapp, Kamiel Spoelstra, Marcel E. Visser, Early Birds by Light at Night: Effects of Light Color and Intensity on Daily Activity Patterns in Blue Tits, Journal of Biological Rhythms, /, 32, 4, (), (). - G.A. Bartholomew 'The effect of light intensity and day length on reproduction in the English sparrow' Bulletin of the Museum of Comparative Zoology at Harvard College, (3) - 'The late Dr Jenner on the migration of birds' (n.d.) photocopy - W. Rowan 'Experiments in bird migration' Proceedings of the National Academy of Sciences, 18(

    The house sparrow (Passer domesticus) is a bird of the sparrow family Passeridae, found in most parts of the world. It is a small bird that has a typical length of 16 cm ( in) and a mass of 24– g (– oz). Females and young birds are coloured pale brown and grey, and males have brighter black, white, and brown markings. Reflective, light-colored surfaces inside a home or office tend to increase light intensity, while dark surfaces decrease light intensity. Directional Exposure: Day and Night: Day length or duration of light received by plants is also of some importance. Poinsettias, kalanchoes and Christmas cactus flower only when days are 11 hours or less.

    Day-neutral plants have an evolutionary advantage when the connection between the favourable period for reproduction and day length is much less certain. For example, desert annuals germinate, flower and seed whenever suitable rainfall occurs, regardless of the day length. The breeding season of some plants can be delayed to extraordinary lengths. effect of the relative length of day and night and other factors of the environment on growth and reproduction in plants. jouf. agr. research , illus. 3 garner, w. w., and allard, h. a. effect of short alternating periods of light and darkness on plant growth. science (n. s.)


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Effect of light intensity and day length on reproduction in the English sparrow by George A. Bartholomew Download PDF EPUB FB2

THE effects of light intensity and day-length on reproduction in the English sparrow have been studied quantitatively in the laboratory by George A. Bartholomew, jun. (Bull. Mus. Comp. ZooL Cited by: 1. The effect of light intensity and day length on reproduction in the English sparrow.

[George A Bartholomew] Print book: English: Rating: (not yet rated) 0 with reviews - Be the first. Subjects: # House sparrow--Reproduction--Effect of light on\/span> \u00A0\u00A0\u00A0 schema. The Effect of Light Intensity and Day Length on Reproduction in the English Sparrow by George A.

Bartholomew, Jr. Wendell Burger, Some aspects of the roles of light intensity and the daily length of exposure to light in the sexual photoperiodic activation of the male starling, Journal of Experimental Zoology, /jez, 81, 3, (), ().Cited by: A long photoperiod at intensity lower than the threshold of perception by photoreceptors is interpreted as darkness and, hence, induces short day effects [4, 10, 11, 19, 22, 28, 29, 31].

Effects of Light Intensity on Reproduction in S Timothy (Phleum pratense L.) G. RYLE 1 Nature volumepages – () Cite this article. The Effect of Light Intensity and Day Length on Reproduction in the English Sparrow. Article. Jan ; D. Farner; George A. Bartholomew The effect of light intensity and day length on.

Long day length, high ambient temperature, and the light-temperature interaction combined provided a stimulatory effect on testicular development, resulting in early production of semen. After the early period when the gonads of all birds presumably were fully active, the importance of light and temperature on production of semen declined.

Burger, J. W.,On the relation of day length to the phases of testicular involution and inactivity of the spermatogenic cycle of the starling, J. Exp. Zool. – Google Scholar Burger, J. W.,The influence of photic and psychic stimuli on the reproductive cycle of the male starling, Sturnus vulgaris, J.

Exp. Zoo. Effect of light quality and intensity on emergence, growth and reproduction in Chromolaena odorata S.R.

Ambika. Plant Physiology Laboratory, Department of Botany, JnanaBharathi Campus, Bangalore University, Bangalore India, e-mail: [email protected] Abstract. Chromolaena odorata is a perennial weed which invades forest areas cleared.

for prolonging or restarting the reproduction period, whereas in dairy cattle farming it is applied for increasing milk yield and disease resistance. With this regard, a number of researchers (Phillips and Schofield, ; Dahl et al., ; Miller et al., ; Ulimbashev, ) investigated the effect of light day duration and light intensity on.

The role of light in biological activities associated with avian growth and reproduction is very well known. Light quality can be defined by three criteria: 1) daily pattern of lightdark exposure; photoperiod, 2) light intensity (brightness), and 3) spectral.

This study was designed to determine the effects of intermittent white light [2 h of light (L) followed by 2 h of dark (D) repeated six times per day] vs. diurnal white, blue, and red light (12LD), light intensities of lx (high) vs.

lx (low) at high and low population densities, and season of the year on changes in the pineal, pituitary, and adrenal glands and testes of male turkeys. • Effect Behavior, Growth & Reproduction. Pathways of Light Reception Effecting Endocrine System.

Optic nerve. Light Intensity. • Period of illumination = day length/artificial lighting – Daily light/darkness cycle strongest environmental.

Addeddate Documentid Identifier nasa_techdoc_ Identifier-ark ark://t1pg2cm2f Ocr ABBYY FineReader Ppi. Testicular maturation, migratory restlessness (Zugunruhe) and fattening are induced in many species of birds by long day-lengths in Spring. We have tested the hypothesis that extraocular photoreceptors located in the brain are involved in mediating these photoperiodic responses in White-crowned sparrows (Zonotrichia leucophrys) and Golden-crowned sparrows (Z.

atricapilla). Effect of Light on the Rate of Reproduction having a light-tight door behind. Over the front of each box a colour-filter was fixed, these filters being so chosen that the spectrum was divided into three portions with but little overlapping.

The filters selected were. The Autobiography of Benjamin Rush: His "Travels Through Life" Together with His Commonplace Book for F. Sparrow. 24(4), The Effect of Light Intensity and Day Length on Reproduction in the English Sparrow.

Photo sensitive starlings transferred from short days to long days of different light intensities underwent graded reproductive responses according to the light intensity they experienced. Testes size in the group in the lowest intensity (3 lux) increased faster than that in controls on short days of normal intensity, but they did not become photorefractory.

The effect of light intensity during leaf formation on subsequent light-saturated photosynthesis stomatal length in terms of total pore space. Differences in apparent photosynthesis in any one 15° C with a 9 hour day. At least three plants of each genotype were grown in each of three light intensities,and ft-candles.

His doctoral dissertation was on a physiological question within a specific environment: The effect of light intensity and day length on reproduction in the English Sparrow (published in ). However, before his military service, he had studied cormorants in San Francisco Bay and published three papers on them (Bartholomew, b).After about 3 months and when day length decreases below h of light per day (in the wild) complete gonadal regression occurs (Nicholls et al., ).

However, if the day length is subsequently artificially increased further, a full return to reproductive maturity occurs.The book is a pleasant introduction to some of the bkds of Australia which has The effect of light intensity and day length on reproduction in the English sparrow.

Bull. Mus. Comp. Zo, (3):10 pls. BXsEcx.•, Ku•T. Phragmltes-Samen als Nahrung far Feldsperlinge.