Removal indeterminacy and the proximate determination of clutch size in the House Sparrow

Article Abstract:

A study of clutch size and removal indeterminacy of House Sparrows revealed the indeterminate pattern of laying eggs and the influence of endogenous energy reserves on the clutch size of these birds. Egg production in the species was directly influenced by the levels of exogenous and nutrient energy resources and only to a marginal degree by the female's endogenous reserves. The quantity of lipid reserves determine the clutch size in the females.

Analysis, Energy metabolism, Bioenergetics, Eggs, Eggs (Biology), Incubation, English sparrow

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Seasonal decline in clutch size of the barnacle goose in Svalbard

Article Abstract:

Observation of the clutch size seasonal decline of the barnacle goose in Svalbard showed that females that came first to the breeding area displayed better characteristics in terms of clutch size, nesting, prelaying, incubation and brood size. However, these observations failed to support the nutrient allocation hypothesis. An alternative explanation is that later geese spend less of their reserves on eggs.

Behavior, Birds, Geese, Svalbard

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Effects of water conditions on clutch size, egg volume, and hatchling mass of Mallards and Gadwalls in the Prairie Pothole Region

Article Abstract:

Issues concerning relationships between water conditions and the volume of hatched eggs, the size of the clutch and the mass of the hatchlings in the Gadwalls and Mallards of the Region Prairies Pothole in Minnesota and Dakota are discussed.

Bird eggs, Bird nests, Mallard, Dakota County, Minnesota

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