Provisioning in western bluebirds is not related to offspring sex

Marty L. Leonard; Kevin L. Teather; Andrew G. Horn; Walter D. Koenig; Janis L. Dickinson

doi:10.1093/beheco/5.4.455

Provisioning in western bluebirds is not related to offspring sex

Marty L. Leonard, Kevin L. Teather, Andrew G. Horn, Walter D. Koenig, Janis L. Dickinson

Medicine

Medicine

Résultat de recherche: Article › examen par les pairs

34 Citations (Scopus)

Résumé

Parents should invest more in one sex of offspring if the fitness return per unit investment is higher for that sex. Sex-biased provisioning may occur when sons and daughters differ in their needs or when there is local resource competition or enhancement. We used feeding observations and sex-ratio manipulations to determine if sex-biased provisioning occurs in western bluebirds (Sialia mexicana). The sex ratio of the brood had no effect on feeding rates by adults at unmanipulated nests over a 6-year period. Adult males and females also did not differ in the number of feedings made to sons and daughters in 13 videotaped nests. Likewise, adult feeding rates to nests experimentally biased toward sons or daughters did not differ significantly. Nesdings that were closest to the nest hole and that reached highest were the most likely to be fed. Sons and daughters did not differ in the begging behaviors most likely to result in a feeding. We conclude that sex-biased provisioning does not occur in this population of western bluebirds and diat nesding behavior may be a more important determinant of feeding.

Langue d'origine	English
Pages (de-à)	455-459
Nombre de pages	5
Journal	Behavioral Ecology
Volume	5
Numéro de publication	4
DOI	https://doi.org/10.1093/beheco/5.4.455
Statut de publication	Published - déc. 1994

Note bibliographique

Funding Information:
We thank Elsie Krebs, Rob Magrath, Richard Moses, Bill Shields, Jamie Smith, Dan Weary, and Larry Wolf for reading the manuscript and making many useful comments. We also thank the following for help with the data collection: C. Adams, D. Barber, R. Bowers, S. Carpenter, D. Christian, K. Dean, V. Demas, M. Eichholz, R. Ete-mand, J. Goldstein, N. Hazle, S. Kuhnholz, M. Lewis, D. Monk, J. Rombouts, J. Rosenthal, P. Shepard, and K. Truman. In addition, we thank Oak Ridge Ranch for access to their land, M. Stromberg for logistic support, and Fanny Arnold for her support of Hastings Reservation. This work was funded by Natural Sciences and Engineering Research Council postdoctoral fellowships awarded to K.L.T. and A.G.H., National Science Foundation grant BSR87-04992 to W.D.K. and North American Bluebird Society and Ellis Bird Farm grants to J.L.D. and a NSF postdoctoral fellowship to J.L.D.

ASJC Scopus Subject Areas

Ecology, Evolution, Behavior and Systematics
Animal Science and Zoology

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10.1093/beheco/5.4.455

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title = "Provisioning in western bluebirds is not related to offspring sex",

abstract = "Parents should invest more in one sex of offspring if the fitness return per unit investment is higher for that sex. Sex-biased provisioning may occur when sons and daughters differ in their needs or when there is local resource competition or enhancement. We used feeding observations and sex-ratio manipulations to determine if sex-biased provisioning occurs in western bluebirds (Sialia mexicana). The sex ratio of the brood had no effect on feeding rates by adults at unmanipulated nests over a 6-year period. Adult males and females also did not differ in the number of feedings made to sons and daughters in 13 videotaped nests. Likewise, adult feeding rates to nests experimentally biased toward sons or daughters did not differ significantly. Nesdings that were closest to the nest hole and that reached highest were the most likely to be fed. Sons and daughters did not differ in the begging behaviors most likely to result in a feeding. We conclude that sex-biased provisioning does not occur in this population of western bluebirds and diat nesding behavior may be a more important determinant of feeding.",

author = "Leonard, {Marty L.} and Teather, {Kevin L.} and Horn, {Andrew G.} and Koenig, {Walter D.} and Dickinson, {Janis L.}",

note = "Funding Information: We thank Elsie Krebs, Rob Magrath, Richard Moses, Bill Shields, Jamie Smith, Dan Weary, and Larry Wolf for reading the manuscript and making many useful comments. We also thank the following for help with the data collection: C. Adams, D. Barber, R. Bowers, S. Carpenter, D. Christian, K. Dean, V. Demas, M. Eichholz, R. Ete-mand, J. Goldstein, N. Hazle, S. Kuhnholz, M. Lewis, D. Monk, J. Rombouts, J. Rosenthal, P. Shepard, and K. Truman. In addition, we thank Oak Ridge Ranch for access to their land, M. Stromberg for logistic support, and Fanny Arnold for her support of Hastings Reservation. This work was funded by Natural Sciences and Engineering Research Council postdoctoral fellowships awarded to K.L.T. and A.G.H., National Science Foundation grant BSR87-04992 to W.D.K. and North American Bluebird Society and Ellis Bird Farm grants to J.L.D. and a NSF postdoctoral fellowship to J.L.D.",

year = "1994",

month = dec,

doi = "10.1093/beheco/5.4.455",

language = "English",

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AU - Leonard, Marty L.

AU - Teather, Kevin L.

AU - Horn, Andrew G.

AU - Koenig, Walter D.

AU - Dickinson, Janis L.

N1 - Funding Information: We thank Elsie Krebs, Rob Magrath, Richard Moses, Bill Shields, Jamie Smith, Dan Weary, and Larry Wolf for reading the manuscript and making many useful comments. We also thank the following for help with the data collection: C. Adams, D. Barber, R. Bowers, S. Carpenter, D. Christian, K. Dean, V. Demas, M. Eichholz, R. Ete-mand, J. Goldstein, N. Hazle, S. Kuhnholz, M. Lewis, D. Monk, J. Rombouts, J. Rosenthal, P. Shepard, and K. Truman. In addition, we thank Oak Ridge Ranch for access to their land, M. Stromberg for logistic support, and Fanny Arnold for her support of Hastings Reservation. This work was funded by Natural Sciences and Engineering Research Council postdoctoral fellowships awarded to K.L.T. and A.G.H., National Science Foundation grant BSR87-04992 to W.D.K. and North American Bluebird Society and Ellis Bird Farm grants to J.L.D. and a NSF postdoctoral fellowship to J.L.D.

PY - 1994/12

Y1 - 1994/12

N2 - Parents should invest more in one sex of offspring if the fitness return per unit investment is higher for that sex. Sex-biased provisioning may occur when sons and daughters differ in their needs or when there is local resource competition or enhancement. We used feeding observations and sex-ratio manipulations to determine if sex-biased provisioning occurs in western bluebirds (Sialia mexicana). The sex ratio of the brood had no effect on feeding rates by adults at unmanipulated nests over a 6-year period. Adult males and females also did not differ in the number of feedings made to sons and daughters in 13 videotaped nests. Likewise, adult feeding rates to nests experimentally biased toward sons or daughters did not differ significantly. Nesdings that were closest to the nest hole and that reached highest were the most likely to be fed. Sons and daughters did not differ in the begging behaviors most likely to result in a feeding. We conclude that sex-biased provisioning does not occur in this population of western bluebirds and diat nesding behavior may be a more important determinant of feeding.

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Provisioning in western bluebirds is not related to offspring sex

Résumé

Note bibliographique

ASJC Scopus Subject Areas

Accès au document

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