Interplay between the energetics of foraging and thermoregulatory costs in the green-backed firecrown hummingbird <i>Sephanoides sephaniodes</i>

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dc.contributor.authorFernández, MJ
dc.contributor.authorLópez-Calleja, MV
dc.contributor.authorBozinovic, F
dc.date.accessioned2025-01-21T01:10:23Z
dc.date.available2025-01-21T01:10:23Z
dc.date.issued2002
dc.description.abstractIn response to the interplay between variation in food quality and energetic demands, the foraging behaviour of captive green-backed firecrown hummingbirds Sephanoides sephaniodes was studied. Hummingbirds were exposed to two temperatures (25 degreesC vs 15 degreesC, two food qualities (0.5 vs 0.75 m sucrose solutions), and two costs of feeding (birds were provided with feeders with and without a perch). Food selection and consumption were measured, as well as time budgets and metabolic rate while feeding. We predicted that when given a choice, birds would minimize the cost of feeding by selecting feeders with a perch and with a high sugar concentration. However, rather than increasing energy consumption when energy availability was low and thermoregulatory demands were high, hummingbirds remained perched. They reduced feeding and spent most of their time perching. Our results identify a novel behavioural and physiological strategy in hummingbirds. These birds seem to shift their foraging behaviour depending on thermo regulatory and feeding costs. When these costs are high, rather than matching them with increased energy consumption, hummingbirds reduce energy costs by reducing activity. They seemed to adopt the following strategy: when food quality was high and thermoregulatory demands were low, they adopted a high-expense lifestyle. In contrast, when thermoregulatory costs were high, they adopted an energy conserving strategy even when food quality was high. We hypothesize that limitations imposed by physiological processes may explain why animals do not forage during all available time and why under some circumstances they choose foraging behaviours with lower rates of net energy gain.
dc.fuente.origenWOS
dc.identifier.doi10.1017/S0952836902001450
dc.identifier.eissn1469-7998
dc.identifier.issn0952-8369
dc.identifier.urihttps://doi.org/10.1017/S0952836902001450
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96679
dc.identifier.wosidWOS:000179553600009
dc.language.isoen
dc.pagina.final326
dc.pagina.inicio319
dc.revistaJournal of zoology
dc.rightsacceso restringido
dc.subjectcost of feeding
dc.subjecttime and energy use
dc.subjecthummingbirds
dc.subjectSephanoides sephaniodes
dc.subject.ods15 Life on Land
dc.subject.ods13 Climate Action
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa13 Acción por el clima
dc.titleInterplay between the energetics of foraging and thermoregulatory costs in the green-backed firecrown hummingbird <i>Sephanoides sephaniodes</i>
dc.typeartículo
dc.volumen258
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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