Composition of Eared Grebe and Western Grebe Eggs

Hill, Wendy L.; Browne, Marybeth; Hardenbergh, Cynthia

doi:10.2307/1369546

The Condor

1995

DOI: 10.2307/1369546

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Composition of Eared Grebe and Western Grebe Eggs

Wendy L. Hill

Marybeth Browne

Cynthia Hardenbergh

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Cited by 5 publications

(2 citation statements)

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“…Egg size is known to correlate with the nutrient investment. Several studies have reported that egg size reflected the lipid and/or protein content of the eggs (Meathrel and Ryder 1987, Williams 1994, Hill et al 1995, Royle et al 1999, Jager et al 2000, Badzinski et al 2002, Reynolds et al 2003, providing an indirect measure of maternal favouritism through egg nutrients.…”

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confidence: 99%

Maternal compensation for hatching asynchrony in the collared flycatcher Ficedula albicollis

Rosivall¹,

Szöllősi²,

Török³

2005

J Avian Biology

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rö k, J. 2005. Maternal compensation for hatching asynchrony in the collared flycatcher Ficedula albicollis. Á/ J. Avian Biol. 36: 531 Á/537.Several hypotheses have been proposed to explain the adaptiveness of hatching asynchrony for the parents, but delayed hatching is generally detrimental for the late hatched young. These offspring often experience competitive disadvantage and delayed development. If hatching asynchrony has a reason other than producing competitive differences among offspring, it would be advantageous, not only for the offspring but even for the parents, to compensate for its detrimental effects. In some species, increasing investment into later laid eggs has been reported and discussed as a compensation mechanism, but its effect on nestling growth and fledging size has not been examined in details. In this study we investigated nestling growth and size at fledging in terms of body mass and length of primaries in relation to the accurate laying and hatching order in collared flycatcher Ficedula albicollis broods. We found that females laid larger eggs at the end of the laying sequence, and this helped to decrease the disadvantages for the last offspring. The last offspring had lower body mass growth rate and fledged with shorter feathers, but in both cases the larger the last egg was, the smaller the lag of the offspring was. We conclude, that even if females were not able to fully compensate for the detrimental effects of hatching asynchrony, larger eggs may improve the survival prospects of late hatched nestlings.B. Rosivall, E. Szö llősi (correspondence) and J. Tö rö k,

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mentioning

confidence: 99%

Maternal compensation for hatching asynchrony in the collared flycatcher Ficedula albicollis

Rosivall¹,

Szöllősi²,

Török³

2005

J Avian Biology

View full text Add to dashboard Cite

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“…Several studies have reported that egg size reflected the lipid and/or protein content of the eggs (Meathrel and Ryder 1987, Williams 1994, Hill et al 1995, Royle et al 1999, Jager et al 2000, Badzinski et al 2002, Reynolds et al 2003, providing an indirect measure of maternal favouritism through egg nutrients.…”

mentioning

confidence: 99%

Maternal compensation for hatching asynchrony in the collared flycatcherFicedula albicollis

Rosivall

Szöllősi

Török

2005

Journal of Avian Biology

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On the Allometric Relationship Between Size and Composition of Avian Eggs: A Reassessment

Arnold

Green

2007

The Condor

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Abstract. Numerous investigators have used allometric regression to characterize the relationship between proportional egg composition and egg size, which is a potentially important characterization for assessing maternal investment in reproduction. Herein, we document two important shortcomings of this approach. First, regressing log component mass against log egg mass involves regressing Y on itself, since each component (Y) is necessarily a part of the whole egg (X). This creates correlated errors, which leads to biased estimates of the regression slope. To circumvent this problem, we recommend regressing egg component masses on a relatively inert component like total water mass. Secondly, investigators routinely use ordinary least squares regression to estimate the slope of allometric relationships, which assumes that all error resides in Y. We demonstrate that this assumption is false, but so are the underlying error assumptions of commonly used alternatives such as reduced major axis and major axis regression. Because each egg is unique and determining composition involves destructive sampling, there is no obvious way to assess measurement error in Y versus X. As a solution, we recommend that investigators analyze multiple eggs per clutch whenever possible and fit a reduced major axis based on the among-female component of variability.

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Composition of Eared Grebe and Western Grebe Eggs

Cited by 5 publications

References 23 publications

Maternal compensation for hatching asynchrony in the collared flycatcher Ficedula albicollis

Maternal compensation for hatching asynchrony in the collared flycatcher Ficedula albicollis

Maternal compensation for hatching asynchrony in the collared flycatcherFicedula albicollis

On the Allometric Relationship Between Size and Composition of Avian Eggs: A Reassessment

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