Shatkovska Oksana V, Ghazali Maria, Mytiai Ivan S, Druz Natalia
Department of Evolutionary Morphology, Schmalhausen Institute of Zoology of NAS of Ukraine, Kyiv, Ukraine.
Faculty of Livestock Raising and Water Bioresources, Department of Animal Biology, National University of Life and Environmental Science of Ukraine, Kyiv, Ukraine.
J Morphol. 2018 Nov;279(11):1590-1602. doi: 10.1002/jmor.20888. Epub 2018 Oct 22.
While eggs shapes and sizes have been subject of many studies, we still know little about factors affecting these characteristics of birds' eggs. We revealed that shapes of pelvis and egg correlated less than their respective sizes. Egg measurements (length or diameter) scaled with negative allometry against pelvis size, that is, eggs become relatively larger with decreasing pelvis size. Studied birds with altricial developmental mode had on average the smallest pelvic dimensions and the largest relative size of eggs. However, this is due to the effect of small pelvis size (and body as a whole) of most altricials. At the similar size of the pelvis, birds with altricial developmental mode had a smaller relative size of eggs than their precocial counterparts. Correlation between the shape of egg and pelvis is affected by habitat. Narrow pelvis with an elongated postacetabular region correlated with elongated eggs in diving waterfowl. In raptorial birds, the relatively wide pelvis with the shortened postacetabular region correlated with the nearly rounded shape of eggs.
虽然蛋的形状和大小一直是许多研究的主题，但我们对影响鸟类蛋这些特征的因素仍然知之甚少。我们发现，骨盆和蛋的形状之间的相关性小于它们各自大小之间的相关性。蛋的尺寸（长度或直径）与骨盆大小呈负异速生长比例关系，也就是说，随着骨盆尺寸减小，蛋会相对变大。研究中具有晚成雏发育模式的鸟类平均骨盆尺寸最小，蛋的相对尺寸最大。然而，这是由于大多数晚成雏的骨盆尺寸（以及整个身体）较小所致。在骨盆尺寸相似的情况下，具有晚成雏发育模式的鸟类蛋的相对尺寸比早成雏的同类鸟类要小。蛋和骨盆形状之间的相关性受栖息地影响。在潜水水鸟中，髋臼后区域细长的窄骨盆与细长的蛋相关。在猛禽中，髋臼后区域缩短的相对较宽的骨盆与近乎圆形的蛋相关。
