Evaporative water loss and dehydration during the night in hummingbirds

Nectar-feeding birds oscillate between avoiding overhydration when they are feeding and preventing dehydration during fasts. Here, we examined how resting rates of total evaporative water loss (TEWL) and metabolic water production (MWP) influence water balance in the green-backed firecrown (Sephanoi...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	HARTMAN BAKKEN,BRADLEY, SABAT,PABLO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2007
Materias:	circadian rhythm evaporative water loss hummingbird osmoregulation water balance
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000300001
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0716-078X2007000300001
record_format	dspace
spelling	oai:scielo:S0716-078X20070003000012008-04-01Evaporative water loss and dehydration during the night in hummingbirdsHARTMAN BAKKEN,BRADLEYSABAT,PABLO circadian rhythm evaporative water loss hummingbird osmoregulation water balance Nectar-feeding birds oscillate between avoiding overhydration when they are feeding and preventing dehydration during fasts. Here, we examined how resting rates of total evaporative water loss (TEWL) and metabolic water production (MWP) influence water balance in the green-backed firecrown (Sephanoides sephanoides), a Chilean hummingbird. We hypothesized that a circadian rhythm in TEWL would assuage the dehydration risk that hummingbirds face during the night. However, we did not find support for this idea. In resting hummingbirds, rates of TEWL during the day (54 ±6 µLh-1,n = 8) and night (65 ± 12 h-1, n = 5) were similar. Rates of MWP were also similar between the day (22 ±3 µL h-1, n = 8) and night (23 ± 2 µL h-1, n = 5). MWP rates were significantly lower than TEWL rates during both the day and night. Our findings both support the notion that hummingbirds dehydrate during extended fasts and illustrate that evaporative water loss is an important osmoregulatory consideration in hummingbirds. However, because the technique we used to estimate rates of TEWL and MWP at night was indirect, our findings should be interpreted cautiously until direct measurements are availableinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.80 n.3 20072007-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000300001en10.4067/S0716-078X2007000300001
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	circadian rhythm evaporative water loss hummingbird osmoregulation water balance
spellingShingle	circadian rhythm evaporative water loss hummingbird osmoregulation water balance HARTMAN BAKKEN,BRADLEY SABAT,PABLO Evaporative water loss and dehydration during the night in hummingbirds
description	Nectar-feeding birds oscillate between avoiding overhydration when they are feeding and preventing dehydration during fasts. Here, we examined how resting rates of total evaporative water loss (TEWL) and metabolic water production (MWP) influence water balance in the green-backed firecrown (Sephanoides sephanoides), a Chilean hummingbird. We hypothesized that a circadian rhythm in TEWL would assuage the dehydration risk that hummingbirds face during the night. However, we did not find support for this idea. In resting hummingbirds, rates of TEWL during the day (54 ±6 µLh-1,n = 8) and night (65 ± 12 h-1, n = 5) were similar. Rates of MWP were also similar between the day (22 ±3 µL h-1, n = 8) and night (23 ± 2 µL h-1, n = 5). MWP rates were significantly lower than TEWL rates during both the day and night. Our findings both support the notion that hummingbirds dehydrate during extended fasts and illustrate that evaporative water loss is an important osmoregulatory consideration in hummingbirds. However, because the technique we used to estimate rates of TEWL and MWP at night was indirect, our findings should be interpreted cautiously until direct measurements are available
author	HARTMAN BAKKEN,BRADLEY SABAT,PABLO
author_facet	HARTMAN BAKKEN,BRADLEY SABAT,PABLO
author_sort	HARTMAN BAKKEN,BRADLEY
title	Evaporative water loss and dehydration during the night in hummingbirds
title_short	Evaporative water loss and dehydration during the night in hummingbirds
title_full	Evaporative water loss and dehydration during the night in hummingbirds
title_fullStr	Evaporative water loss and dehydration during the night in hummingbirds
title_full_unstemmed	Evaporative water loss and dehydration during the night in hummingbirds
title_sort	evaporative water loss and dehydration during the night in hummingbirds
publisher	Sociedad de Biología de Chile
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000300001
work_keys_str_mv	AT hartmanbakkenbradley evaporativewaterlossanddehydrationduringthenightinhummingbirds AT sabatpablo evaporativewaterlossanddehydrationduringthenightinhummingbirds
_version_	1718439601219043328

Evaporative water loss and dehydration during the night in hummingbirds

Ejemplares similares