Water economy of granivorous birds: California house finches

Article Abstract:

Coastal and desert populations of house finches, Carpodacus mexicanus, were used in the investigation of water economy among birds that rely on grains as food using a model that calculates water balance based on metabolic production and evaporative losses intake and excretion being equal. Results reveal that house finches are dependent on exogenous sources to maintain water balance in most circumstances. Water independence is achieved at night among desert forms of house finches.

Physiological aspects, Water-electrolyte balance (Physiology), Fluid-electrolyte balance, Finches, Darwin's finches

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Using artificial food patches to evaluate habitat quality for granivorous birds: an application of foraging theory

Article Abstract:

Granivorous birds such as Northern Bobwhites respond to both food abundance and availability of structural cover against predation. Birds abandon food patches when an alternative foraging opportunity is available or when lack of structural cover increases the risk of predation. This behavior of the birds is independent of whether the food patch is artificial or natural, and of the number of foragers exploiting them.

Analysis, Observations, Habitats, Predation (Biology), Animal feeding and feeds

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Effectiveness, biases and mortality in the use of apomorphine for determining the diet of Granivorous Passerines

Article Abstract:

Effectiveness of apomorphine on several granivorous species by using field and laboratory data was evaluated. The influence of age, food type and repetitive treatments were tested by using emetic to young Serin chicks. Effectiveness of the emetic differed among the three species. Diet contents of emetic samples of Goldfinch and Greenfinch nestlings suggest that diet contents do not differ from the Serins.

Food and nutrition, Emetics, Apomorphine

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