Nutrient Levels in Guano from Maternity Colonies of Big Brown Bats

Autor:	Russell A. Schenck, John O. Keeler, Eugene H. Studier, Steven H. Sevick
Rok vydání:	1994
Předmět:	Ecology biology Dietary intake Foraging biology.organism_classification Predation Animal science Nutrient Habitat Eptesicus fuscus Genetics Guano Animal Science and Zoology Ecology Evolution Behavior and Systematics Feces Nature and Landscape Conservation
Zdroj:	Journal of Mammalogy. 75:71-83
ISSN:	0022-2372 1545-1542
DOI:	10.2307/1382237
Popis:	Samples of typical guano, collected weekly during the summer roosting period from six maternity roosts of big brown bats ( Eptesicus fuscus ), were analyzed for levels of nitrogen, sodium, potassium, calcium, magnesium, and iron. Total time and variability patterns, unique for each nutrient, suggested limiting or inadequate dietary intake of calcium for most of the summer and of iron from the end of lactation onward. Samples of atypical guano often contained high levels of calcium or iron. Levels of some nutrients in guano, and, therefore, nutrient budgets, differed between roosts within weekly collections, especially early in the roosting period, and generally reflected differences in levels of those nutrients from insects available as prey near those roosts. Certain insects (e.g., plecopterans and noctuids) apparently were not consumed in proportion to their availability. Big brown bats foraging over permanent streams showed nutrient budgets that differed from those of bats feeding over land.
Databáze:	OpenAIRE
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