Results 251 to 260 of about 1,947,763 (295)

Hatching Success of Mayfly Eggs at Low pH

Canadian Journal of Fisheries and Aquatic Sciences, 1988
Eggs of the mayflies Leptophlebia cupida, Habrophlebia vibrans, Stenonema femoratum, and Baetis flavistriga were reared in soft water at several pH levels (4.0, 4.5, 5.0, and 6.5) in the laboratory. The proportion of eggs undergoing eclosion did not vary with pH. However, in B. flavistriga, significant mortality of nymphs occurred before the hatch was
Locke Rowe, Jeffrey Hudson, Michael Berrill   +2 more
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Hatching asynchrony in Burrowing Owls is influenced by clutch size and hatching success but not by food

Oecologia, 2004
In most animals, siblings from a given reproductive event emerge over a very short period of time. In contrast, many species of birds hatch their young asynchronously over a period of days or weeks, handicapping last-hatched chicks with an age and size disadvantage.
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Hatching asynchrony and reproductive success in the blackbird

Nature, 1989
A GENERAL problem of parental investment is that resources required to nourish offspring may be unpredictable at the time fertilization occurs1–5. Lack1 suggested that the best strategy for altricial birds faced with such unpredictability might be to lay an optimistic clutch size and to begin incubation before laying is complete.
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Organochlorine residues, eggshell thinning and hatching success in British sparrowhawks

Nature, 1974
SPARROWHAWKS (Accipiter nisus) in Britain have laid thin-shelled eggs throughout the period of DDT usage1, and in several predatory species in North America an inverse correlation has been shown between shell thickness and DDE levels in eggs, both in natural and in experimental situations2–4.
I, Newton, J, Bogan
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Patterns of Hatching Success in Subarctic Birds

Ecology, 1971
Data from a single subarctic locality are used to test Ricklef's general conclusions regarding patters of nesting mortality in arctic birds. They provide additional evidence that hatching success is greater among arctic than among Temperate Zone passerines.
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ANOTHER SUCCESSFUL HATCHING OF SNAKE EGGS

Journal of the Herpetological Association of Rhodesia, 1961
(1961). ANOTHER SUCCESSFUL HATCHING OF SNAKE EGGS. Journal of the Herpetological Association of Rhodesia: Vol. 16, No. 1, pp. 14-15.
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Assisted Hatching of Human Embryos for Successful Implantation

2019
For successful implantation, the human embryo must breach the zona pellucida, an extracellular glycoproteic matrix surrounding ovulated eggs and preimplantation embryos. This process, defined as “hatching,” is a necessary step in reproduction and occurs when the embryo reaches the blastocyst stage.
Matteo A. Avella, Kristine A. Milne, Shagufta Dawood, Adam Dawood, Michael J. Tucker   +4 more
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Hatch Door Counterweight Is ‘Grate’ Success

Opflow, 1996
This method of improving the operation of steel grating hatch doors results from 10 years' worth of opening and closing the doors! The basic problem is that, because of the heavy weight of the grate openings, workers have a tendency to leave an opened grate in the open position (creating a safety hazard) or in the closed position (deterring operator ...
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Effects of Salinity on Hatching Success of the Cui-ui

The Progressive Fish-Culturist, 1979
Abstract Fertilized eggs of cui-ui (Chasmistes cujus) were incubated in Pyramid Lake water (salinity, 5.2‰), two dilutions of the lake water (salinities of 3.8 and 1.8‰), and fresh well water. Experimental laboratory results indicate that some cui-ui eggs could hatch in Pyramid Lake where salinity approximates 1.8‰ and that hatching success would ...
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Hatching Success in Roof and Ground Colonies of Least Terns

The Condor, 1991
Least Terns (Sterna antillarum) were first reported nesting on gravel-covered roofs in Florida more than 30 years ago (Goodnight 1957). Roof-nesting colonies have since become increasingly common in the southeastern United States (Fisk 1975, 1978; Jackson and Jackson 1985), and in some areas of Florida Least Terns nesting on roofs outnumber those on ...
Gore, Jeffery A., Kinnison, Michael J.
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