... Eberhardt (1987) trapped 41 nest-ing females for radio-tagging. ... This appears to be what h... more ... Eberhardt (1987) trapped 41 nest-ing females for radio-tagging. ... This appears to be what happened to the gos-lings disappearing in transit at Fish Springs. ... often were unable to keep up with the rest of the brood during trips through dense saltgrass or harsh upland desert. ...
... that saline water reduced growth, and growth rate decreased as conduc-I E-mail: fajohn@cc.usu... more ... that saline water reduced growth, and growth rate decreased as conduc-I E-mail: fajohn@cc.usu.edu or john.bissonette@cnr.usu ... the time and expertise that the following individuals and organizations donated to the project: TW Aldrich, SS Manes, RS Wilhelm, DP Stevens, J. ...
From 23 to 25 July 2002, 98-103 newly hatched black-bellied whistling ducks (Dendrocygna autumnal... more From 23 to 25 July 2002, 98-103 newly hatched black-bellied whistling ducks (Dendrocygna autumnalis) were observed alive at an inland saline lake (La Sal Vieja) in Willacy County, Texas (USA). Seventy-one (71%) died after showing signs indicative of sodium toxicity within 5 hr of entering the water; some died within minutes. Six carcasses were sent to the United States Geological Survey, National Wildlife Health Center (Madison, Wisconsin, USA) for analysis, and brain sodium levels of all ducklings were above 2,000 parts per million wet weight. More black-bellied whistling duck ducklings are likely to have been affected, but they were not observed after hatching.
ABSTRACT Se observaron adultos patos sirirí vientre negro (Dendrocygna autummalis) dejando las is... more ABSTRACT Se observaron adultos patos sirirí vientre negro (Dendrocygna autummalis) dejando las islas con crías recientes de un lago hipersalino al sur de Texas, durante el verano del 2003. Se contaron 216 crías de 20 nidadas intentando realizar su primer viaje sobre el lago y llegar a tierra firme, probablemente para encontrar el hábitat adecuado para su crianza. De estas crías, 144 (67%) murieron en el agua o en la orilla incrustada con sal entre minutos hasta unas cuantas horas después de meterse al agua. Se encontraron un total de 35 cadáveres adicionales de anidamientos no observados. A nueve de estas crías se les practicó la necropsia y los resultados reflejaron altos niveles de sodio en concentraciones letales para el cerebro. En los esfuerzos de vigilancia que realizamos, observamos un decremento del número máximo de adultos de patos sirirí vientre negro en las islas, en el 2002 se contaron 489 individuos y 138 individuos en el 2003.
... Eberhardt (1987) trapped 41 nest-ing females for radio-tagging. ... This appears to be what h... more ... Eberhardt (1987) trapped 41 nest-ing females for radio-tagging. ... This appears to be what happened to the gos-lings disappearing in transit at Fish Springs. ... often were unable to keep up with the rest of the brood during trips through dense saltgrass or harsh upland desert. ...
... that saline water reduced growth, and growth rate decreased as conduc-I E-mail: fajohn@cc.usu... more ... that saline water reduced growth, and growth rate decreased as conduc-I E-mail: fajohn@cc.usu.edu or john.bissonette@cnr.usu ... the time and expertise that the following individuals and organizations donated to the project: TW Aldrich, SS Manes, RS Wilhelm, DP Stevens, J. ...
From 23 to 25 July 2002, 98-103 newly hatched black-bellied whistling ducks (Dendrocygna autumnal... more From 23 to 25 July 2002, 98-103 newly hatched black-bellied whistling ducks (Dendrocygna autumnalis) were observed alive at an inland saline lake (La Sal Vieja) in Willacy County, Texas (USA). Seventy-one (71%) died after showing signs indicative of sodium toxicity within 5 hr of entering the water; some died within minutes. Six carcasses were sent to the United States Geological Survey, National Wildlife Health Center (Madison, Wisconsin, USA) for analysis, and brain sodium levels of all ducklings were above 2,000 parts per million wet weight. More black-bellied whistling duck ducklings are likely to have been affected, but they were not observed after hatching.
ABSTRACT Se observaron adultos patos sirirí vientre negro (Dendrocygna autummalis) dejando las is... more ABSTRACT Se observaron adultos patos sirirí vientre negro (Dendrocygna autummalis) dejando las islas con crías recientes de un lago hipersalino al sur de Texas, durante el verano del 2003. Se contaron 216 crías de 20 nidadas intentando realizar su primer viaje sobre el lago y llegar a tierra firme, probablemente para encontrar el hábitat adecuado para su crianza. De estas crías, 144 (67%) murieron en el agua o en la orilla incrustada con sal entre minutos hasta unas cuantas horas después de meterse al agua. Se encontraron un total de 35 cadáveres adicionales de anidamientos no observados. A nueve de estas crías se les practicó la necropsia y los resultados reflejaron altos niveles de sodio en concentraciones letales para el cerebro. En los esfuerzos de vigilancia que realizamos, observamos un decremento del número máximo de adultos de patos sirirí vientre negro en las islas, en el 2002 se contaron 489 individuos y 138 individuos en el 2003.
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