%ABradley, Dawson [Department of Biology Eastern Michigan University Ypsilanti Michigan USA]%AWurtz, Megan [Department of Biology Eastern Michigan University Ypsilanti Michigan USA]%ACornelius, Jamie [Department of Integrative Biology Oregon State University Corvallis Oregon USA]%BJournal Name: Journal of Experimental Zoology Part A: Ecological and Integrative Physiology; Journal Volume: 333; Journal Issue: 9; Related Information: CHORUS Timestamp: 2023-09-04 17:08:43 %D2020%IWiley Blackwell (John Wiley & Sons) %JJournal Name: Journal of Experimental Zoology Part A: Ecological and Integrative Physiology; Journal Volume: 333; Journal Issue: 9; Related Information: CHORUS Timestamp: 2023-09-04 17:08:43 %K %MOSTI ID: 10257640 %PMedium: X %TRecovery of hematocrit and fat deposits varies by cage size in food‐restricted captive red crossbills ( Loxia curvirostra ) %X
Hematocrit—or the percent volume of red blood cells in whole blood—is thought to fluctuate adaptively in response to changing oxygen demands that occur during different life activities and in different environments. Because red blood cells are made from materials that can be limiting, however, it is thought that hematocrit may also reflect general body condition and access to resources. We tested the effect of hydration state, resource restriction (i.e., time available to forage), and activity (i.e., different cage sizes) on hematocrit in captive red crossbills (