Show simple item record Shankar, Anusha Graham, Catherine H. Canepa, Joseph R. Wethington, Susan M. Powers, Donald R.
dc.coverage.spatial Arizona
dc.coverage.temporal Holocene 2019-08-13T16:00:46Z 2019-08-13T16:00:46Z 2019-08-02
dc.identifier doi:10.5061/dryad.r18r8p1
dc.identifier.citation Shankar A, Graham CH, Canepa JR, Wethington SM, Powers DR (2019) Hummingbirds budget energy flexibly in response to changing resources. Functional Ecology.
dc.description 1. Managing energy stores in response to variable resource availability is a key component to individual fitness, yet because directly measuring energy budgets is difficult, daily energy management is rarely measured. 2. Hummingbirds’ energy management is relatively simple to model compared to other endotherms because they have high mass-specific metabolic rates and store little fat. 3. We determined which aspects of the hummingbird daily energy budget (i.e. thermoregulation, daytime activity costs, nighttime costs) change at the individual level in response to environmental variation. 4. We found that daily energy expenditure varied three-fold in two populations of broad-billed hummingbirds (Cynanthus latirostris). 5. Our model indicated the energy budget was distributed in the following proportions: daytime activity, 59% (range 22-84%); thermoregulation, 23% (11 – 32%), basal metabolism, 7% (3 – 16%), and nighttime energy 17% (6 – 37%). Activity costs were higher at the hotter, homogeneous site and during the early-wet season at both sites. 6. Increased daily energy expenditure was related to decreased nectar availability, and not significantly related to temperature or bird mass. With climate change, the indirect energetic costs of shifting resources could have greater impacts on endotherm energy budgets than direct costs such as thermoregulation. Increased foraging and activity costs could decrease the energy available to birds for somatic repair and reproduction, potentially causing differential fitness across seasons and sites.
dc.relation.haspart doi:10.5061/dryad.r18r8p1/1
dc.relation.haspart doi:10.5061/dryad.r18r8p1/2
dc.relation.haspart doi:10.5061/dryad.r18r8p1/3
dc.relation.haspart doi:10.5061/dryad.r18r8p1/4
dc.relation.haspart doi:10.5061/dryad.r18r8p1/5
dc.relation.haspart doi:10.5061/dryad.r18r8p1/6
dc.relation.haspart doi:10.5061/dryad.r18r8p1/7
dc.relation.haspart doi:10.5061/dryad.r18r8p1/8
dc.relation.isreferencedby doi:10.1111/1365-2435.13404
dc.subject activity cost
dc.subject BMR
dc.subject individual energy allocation
dc.subject static energy budget
dc.subject thermoregulation
dc.subject torpor
dc.subject hummingbird
dc.subject field energetics
dc.title Data from: Hummingbirds budget energy flexibly in response to changing resources
dc.type Article
dwc.ScientificName Cynanthus latirostris
dc.contributor.correspondingAuthor Shankar, Anusha
prism.publicationName Functional Ecology

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Title DLW daily energy expenditure measurements
Downloaded 1 time
Description Doubly-labelled measurements of daily energy expenditure for broad-billed hummingbirds in Arizona
Download DLW_summary.csv (3.106 Kb)
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Title Modeled values for hummingbird daily energy budget
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Description Includes multiple scenarios for daytime activity, thermoregulation, torpor use, and BMR
Download EnergyBudget_model_values.csv (87.15 Kb)
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Title Validation of the DLW protocol, part A
Downloaded 2 times
Description Comparing control and bird samples' oxygen enrichment.
Download Validation_Enrichment_dose_A.csv (850 bytes)
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Title Validation of DLW protocol, part B
Description Testing equilibration times
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Title Validation of DLW protocol, part C
Description CO2 production by dose using the modified DLW protocol
Download Validation_CO2produc_dose_C.csv (376 bytes)
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Title Scholander-Irving measurements for Costa's hummingbirds
Description Respirometry measurements of oxygen consumption for Costa's hummingbirds in a temperature-controlled chamber. Used to model the thermoneutral zone for broad-billed hummingbirds. Data collected in 1986 by DR Powers.
Download Costas1986_VO2_DRPowers.csv (789 bytes)
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Title Floral Census Data
Description Field point count data for floral abundance at Harshaw and Sonoita across seasons.
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Title Metadata and file descriptors for energy budget datasets
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Description Contains descriptions for all dataset files accompanying this paper (each column and its possible values are described).
Download Metadata_EnergyBudget_ShankarEtal.docx (40.77 Kb)
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