Results 211 to 220 of about 13,650 (237)
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Dieldrin and Eggshell Thickness in Ducks
Nature, 1969CHLORINATED hydrocarbons may cause reproductive failure in several vertebrate species, and their presence seems to be related to the eggshell quality of birds. Raptors in Britain, including the peregrine (Falco peregrinus), sparrow hawk (Accipiter nisus) and golden eagle (Aquila chrysaetos), have reproduced less successfully with the increased use of ...
P N, Lehner, A, Egbert
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WHY PENGUIN EGGSHELLS ARE THICK
The Auk, 2004Abstract Like most other penguin species, Magellanic Penguins (Spheniscus magellanicus) are large-bodied birds that incubate their eggs for a prolonged period on hard substrates with little nesting material—all circumstances that could lead to high rates of egg breakage. However, Magellanic Penguin eggs at Punta Tombo, Argentina are seldom broken. From
P. Dee Boersma +2 more
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Methyl mercury: Its effect on eggshell thickness
Bulletin of Environmental Contamination and Toxicology, 1972The authors have examined the effect of mono- and di-methyl mercury on the shell thickness of two species, the Ring Dove (Streptopelia risoria) and American Kestrel (Falco sparverius). Two clutches (two eggs each) were collected from each pair of doves before the administration of mercury.
D B, Peakall, J L, Lincer
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Eggshell thickness in mallards fed methylmercury
Bulletin of Environmental Contamination and Toxicology, 1980Eggshell thinning has been linked to impaired reproduction in many wild birds. Previous work of my own and others led me to believe that methylmercury may cause some eggshell thinning in birds. The present study was designed to determine whether methylmercury in the diet of mallards would thin their eggshells and whether it would add to eggshell ...
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High ambient temperature decreases eggshell thickness in Zebra Finches
Ibis, 2023Avian females can alter nest‐site selection and breeding behaviour in response to changes in ambient temperature. However, whether females alter eggshell characteristics in response to high ambient temperature is underexplored. To fill this gap, wild‐derived and domesticated Zebra Finches were bred at temperatures of 18 °C and 30 °C or 35 °C.
Haruka Wada +3 more
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Environmental Pollution, 2015
Although eggshell thinning has been described mainly in the context of environmental pollution, it can also be the effect of reproductive changes induced by a developing embryo. On the basis of a literature survey of 25 bird species (26 published papers) we reviewed data on embryo-induced eggshell thinning (EET) in three groups of birds: precocials ...
Grzegorz, Orłowski, Lucyna, Hałupka
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Although eggshell thinning has been described mainly in the context of environmental pollution, it can also be the effect of reproductive changes induced by a developing embryo. On the basis of a literature survey of 25 bird species (26 published papers) we reviewed data on embryo-induced eggshell thinning (EET) in three groups of birds: precocials ...
Grzegorz, Orłowski, Lucyna, Hałupka
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Thickness of the American woodcock eggshell, 1971
Bulletin of Environmental Contamination and Toxicology, 1973Eggs or empty shells of the American woodcock were collected from 10 states in 1971 and shell thickness (mean of clutch means) was compared with that of eggs collected from 16 states during the years 1859–1939. The 1971 shells (n=91) from hatched eggs or those containing fully developed embryos were about 10 percent thinner ...
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Avian Eggshell Thickness: Variability and Sampling
1974(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Klaas, Erwin E +2 more
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DDE Residues and Eggshell Thickness in Prairie Falcons
The Journal of Wildlife Management, 1973The eggshell thickness of prairie falcon (Falco mexicanus) eggs collected in Colorado in 1967-68, and 1972, is related linearily and inversely to the logarithms of the DDE content of the eggs. This relationship is not statistically different from that found in peregrine falcons (F. peregrinus) and brown pelicans (Pelecanus occidentalis).
James H. Enderson, Peter H. Wrege
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Bone parameters of thick and thin eggshell lines of chickens
Comparative Biochemistry and Physiology Part A: Physiology, 1984Comparative measurements of bone parameters were made on chickens from thick and thin eggshell lines that were maintained on a normal diet containing 3.5% calcium, injected i.v. with 45CaCl2 and sacrificed 30 min later. There were no significant differences between shell lines for the following measurements on the left femur: specific gravity, ash wt ...
E G, Buss, R B, Guyer
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