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Capillary-Tube Depth Gauges for Diving Animals: An Assessment of Their Accuracy and Applicability (Indicadores de Profundidad de Tubos Capilares para Animals que se Sumergen: una Evaluación de su Exactitud y Aplicabilidad)

Alan E. Burger and Rory P. Wilson
Journal of Field Ornithology
Vol. 59, No. 4 (Autumn, 1988), pp. 345-354
Published by: Wiley on behalf of Association of Field Ornithologists
Stable URL: http://www.jstor.org/stable/4513365
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Capillary-Tube Depth Gauges for Diving Animals: An Assessment of Their Accuracy and Applicability (Indicadores de Profundidad de Tubos Capilares para Animals que se Sumergen: una Evaluación de su Exactitud y Aplicabilidad)
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Abstract

Gauges to measure the maximum depths attained by diving animals were constructed from plastic tubing lined with soluble indicator powder, at a cost of $0.10 each. In our tests, the differences between real and estimated depths averaged <3% with single immersions of gauges to any depth up to 140 m. With multiple immersions errors were usually <10% and always <25%. The accuracy of the gauges was not affected by depth or duration of dive, rate of descent, or underwater movements simulating a bird's swimming. Errors resulted from severe jarring of the devices underwater, plunge-diving, accumulation of moisture within the tubes, and use of excessive hydrophilic indicator. Potential errors associated with high air-sea temperature gradients were not realized in our tests. With careful construction and deployment the gauges should provide accurate depth estimates without adversely affecting free-living animals. Methods for attaching the gauges to birds are reviewed. /// Indicadores para medir la profundidad máxima lograda por animales que se sumergen fue construida de tubería plástica revestida con un indicador soluble en polvo, a un costo de $0.10 cada una. En nuestras pruebas, las diferencias entre profundidades reales y estimadas promedió <3% despues de sumergir los indicadores una sola vez a profundidades de hasta 140 m. Con multiples inmersiones los errores eran usualmente <10% y siempre <25%. La exactitud de los indicadores no fue afectada por la profundidad o por la duración de la inmersión, razón de descenso o movimientos debajo del agua simulando los de un ave nadando. Los errores surgieron por sacudidas severas de los indicadores una vez sumergidos, clavados, acumulación de humedad dentro de los tubos, y uso excesivo del indicador hidrofílico. Los errores potenciales asociados con los gradientes de alta temperatura mar-aire no se consideraron en nuestras pruebas. Con la construcción y uso cauteloso, los indicadores deben proveer estimados de profundidad exactos sin afectar adversamente los animales de prueba. Los métodos para colocar los indicadores a las aves fueron revisados.

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