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Shell thickness and pore density in relation to shell colouration, female characteristics, and environmental factors in the Collared Flycatcher Ficedula albicollis

Hargitai, Rita and Mateo, R. and Török, János (2011) Shell thickness and pore density in relation to shell colouration, female characteristics, and environmental factors in the Collared Flycatcher Ficedula albicollis. JOURNAL OF ORNITHOLOGY, 152 (3). pp. 579-588. ISSN 2193-7192

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Abstract

Avian eggshell structure may have important consequences for embryonic growth and development, but relatively little is known about the factors responsible for variation in eggshell characteristics of wild birds. In this paper, we explored potential causes of variation in eggshell colour and structure (shell thickness and porosity) in the Collared Flycatcher (Ficedula albicollis). We analysed if eggshell colour is affected by shell structure or pigment level, and whether female traits, laying date, local breeding density, and clutch size affect shell thickness and pore density. We found that eggshell blue-green and UV colours were unrelated to shell thickness, pore density and egg size. Eggs with higher concentration of biliverdin showed lower UV reflection and higher reflection in the blue-green part of the spectrum. We found that females in better nutritional condition, indicated by their higher mass controlled for tarsus length, laid eggs with thicker shells. It is possible that females in better condition have more time available for searching calcium-rich food, and thus could produce eggs with stronger shells. However, female physical characteristics had no significant relationships with shell porosity. In contrast to our expectation, shell thickness and pore density were unrelated to local breeding density and laying date, though very late and repeat clutches were not sampled in our study. However, we found that eggs in larger clutches had lower pore density than eggs in smaller clutches, which may be expected if the rate of water loss and nest humidity are to remain constant in clutches of different egg numbers.

Item Type: Article
Uncontrolled Keywords: INCUBATION PERIODS; INTRASPECIFIC VARIATION; GAS-EXCHANGE; REPRODUCTIVE SUCCESS; EGG COLOR; PIED FLYCATCHER; TIT PARUS-MAJOR; YELLOW-EYED PENGUINS; AVIAN EGGSHELL PIGMENTS; WATER-VAPOR CONDUCTANCE; Ficedula albicollis; Eggshell thickness; Eggshell structure; Eggshell porosity; Eggshell pigmentation; Biliverdin
Subjects: Q Science / természettudomány > QL Zoology / állattan
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 04 Oct 2016 04:07
Last Modified: 04 Oct 2016 04:09
URI: http://real.mtak.hu/id/eprint/41084

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