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8 results for “eggshell thickness”
Greenland Peregrine Falcon eggshell thickness monitoring data 1972 - 2019
<p>The Peregrine Falcon (Falco peregrinus tundrius) population in Greenland has been monitored in different survey areas in South and West Greenland since 1972. At visits to Peregrine Falcon nests, eggshell fragments from hatched eggs as well as addled (dead) eggs left behind have been collected with the aim of monitoring the thickness of the eggshells as well as analysing the whole eggs for contaminants. The shell thickness serves as a proxy for the falcons’ exposure to certain persistant organic pollutants, in particular DDT and its breakdown products (see summaries in Cade et al. 1988).</p> <p>This data set contains the raw data on 6665 eggshell thickness measurements of:<br> 1. Whole eggs from South Greenland 1986-2015<br> 2. Eggshell fragments from the study area in South Greenland 1981-2019<br> 3. Eggshell fragments from the study area around Kangerlussuaq in West Greenland 1972-1989</p> <p>The data set contains a mix of measurements of shell thickness including or excluding the eggshell membranes from the same clutch of eggs. Based on those measurements the average membrane thickness is 0.071 mm (SD=0.013) – a figure confirmed by other studies – and this ’membrane factor’ can be added or subtracted for comparisons with other data sets.</p> <p>Further details regarding the sampling areas, measurement methods and the results of trends analyses of changes in shell thickness are provided in Falk et al. (2006 and 2018).</p> <p>The file named <em>1_Data_Eggshell_Thickness_1972-2019.csv</em> contains the raw measurements data and the file <em>2_ReadMe_Eggshell_Thickness_1972-2019.txt</em> specifies the content. </p> <p>The file named <em>3_Rscript_Eggshell_Thickness_1972-2019.R</em> provides an R script for summarizing and plotting the data as shown in the file <em>4_Plot_Eggshell_Thickness_1972-2019.pdf</em></p>
Figures 7–10 in Regional Comparisons of the Thickness of Moa Eggshell Fragments (Aves: Dinornithiformes)
Figures 7–10. Histograms of moa eggshell thicknesses for samples of (Fig. 7) 340 fragments from the Wairau Bar archaeological site, Marlborough; (Fig. 8) 595 fragments from the Oamaru archaeological site; (Fig. 9) 147 fragments from Chatto Creek, Central Otago; and (Fig. 10) 125 fragments from the Shag River archaeological site, Otago.
Figure 2 in Regional Comparisons of the Thickness of Moa Eggshell Fragments (Aves: Dinornithiformes)
Figure 2. Regressions of mean eggshell thickness on latitude for the eight geographic samples in this study (Table 3) and for the 20 whole moa eggs for which measurements of eggshell thickness are possible (Gill, 2007). For eggshell fragments (open circles), the four North Island data-points are at bottom left and the four South Island ones at middle right. The regression lines and correlation coefficients are: y = 0.028x + 0.027, r = 0.75 (fragments; lower line); y = 0.034x–0.17, r = 0.44 (whole eggs; upper line).
Figure 1 in Regional Comparisons of the Thickness of Moa Eggshell Fragments (Aves: Dinornithiformes)
Figure 1. Locality map of New Zealand showing eight sites (four from each of North and South Islands) for which samples of moa eggshell fragments were measured in this study. Archaeological sites are marked with an asterisk (*).
Figures 3–6 in Regional Comparisons of the Thickness of Moa Eggshell Fragments (Aves: Dinornithiformes)
Figures 3–6. Histograms of moa eggshell thicknesses for samples of (Fig. 3) 612 fragments from North Cape, Northland; (Fig. 4) 1042 fragments from Tokerau Beach, Northland; (Fig. 5) 273 fragments from Puketitiri, Hawke's Bay; and (Fig. 6) 431 fragments from Castle Point, Wairarapa.
Data from: Thick eggshells of brood parasitic cowbirds protect their eggs and damage host eggs during laying
Brood parasites lay thick-shelled eggs and numerous hypotheses have been proposed to explain the significance of this trait. We examined whether thick eggshells protect the parasite egg during laying events. We used eggs of the parasitic shiny cowbird (Molothrus bonariensis) and its hosts, the house wren (Troglodytes aedon) and chalk-browed mockingbird (Mimus saturninus) in South America and the eggs of the parasitic brown-headed cowbird (M. ater) and its hosts the house wren and red-winged blackbird (Agelaius phoeniceus) in North America. We experimentally dropped parasite eggs onto host eggs to simulate laying by the parasite, parasite eggs onto parasite eggs to simulate multiple parasitism, host eggs onto parasite eggs to simulate hosts laying from the height cowbirds lay, and stirred eggs to simulate jostling that may occur when cowbirds and hosts interact during laying events. We found that cowbird eggs were significantly less likely to be damaged than host eggs when they were laid onto a host egg and when host and cowbird eggs were laid onto them. There was minimal damage to eggs during jostling experiments, thereby failing to support the hypothesis that thick eggshells provide protection when eggs are jostled. These findings support the hypotheses that thick eggshells resist damage when laid from an elevated position, when additional cowbird eggs are laid onto them in multiply parasitized nests, and these eggs also damage host eggs when laid.
Data from: Thick eggshells of brood parasitic cowbirds protect their eggs and damage host eggs during laying
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Data from: Experimental increase in temperature affects eggshell thickness, and not egg mass, eggshell spottiness or egg composition in the great tit (Parus major)
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