A Field Study of Temperature Regulation in Young White Pelicans, Pelecanus Erythrorhynchos

Bartholomew, George A.; Dawson, William R.; O'Neill, Edward J.

doi:10.2307/1929727

Cited by 36 publications

(10 citation statements)

References 6 publications

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“…N = 10 singles from the lab and 12 from the colony), and fell within the Tb range reported for downy young of this species by Bartholomew et al ( 1953).…”

Section: Laboratory Studiessupporting

confidence: 82%

Some causal and functional correlates of creching in young white pelicans

Evans¹

1984

Can. J. Zool.

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EVANS, R. M. 1984. Some causal and functional correlates of creching in young white pelicans. Can. J . Zool. 62: 814-819.Field observations and laboratory studies were conducted to examine the hypothesis that creching in white pelicans (Pelecanus erythrorhynchos) constitutes a substitute for parental protection from predators and thermoregulation. Pelicans began to form creches at 17 ? 2 days of age, in close correlation with temporary parental desertion of the nest. Once formed, creches were large and dense overnight when parents were normally absent from the colony, then broke up during the day when parents returned to feed their young. In the absence of parents, social attractions between young, facilitated by disturbance and a possible diurnal rhythm, accounted for the onset of creching. Density within creches, but not creche formation, was related to temperature. Creching began only after the young were too large to be molested by herring gulls, and no other sources of predation were seen. Laboratory measurements of oxygen consumption indicated a small (15.9%) but significant saving in energy from huddling at 10°C, but not at 20 or 30°C. This result suggests that energy saved by creching in the absence of parents could be an important function of overnight creching in this species. Some similarities and differences in creching in pelicans and adelie penguins are discussed. EVANS, R. M. 1984. Some causal and functional correlates of creching in young white pelicans. Can. J . Zool. 62: 8 14-8 19.Des observations en nature et en laboratoire ont permis d'kprouver I'hypothese selon laquelle les pilicans blancs (Peleccrnus erythrorhynchos) Ctablissent des creches en guise de substituts a la protection des parents contre les prkdateurs d'une part, et a la thermorigulation parentale d'autre part. Les pilicans commencent a former des creches quand les oisillons ont 17 2 2 jours, ce qui est en corrilation ktroite avec le moment oh les parents quittent temporairement les nids. Apres leur formation, les creches ont un peuplement important et dense quand les parents sont normalement absents de la colonie, et il y a dispersion le jour, lorsque les parents sont de retour pour nourrir leurs oisillons. En I'absence des parents, I'attraction sociale entre les petits, facilitie par les dirangements et peut-&re par un rythme diurne, est a l'origine de la formation des creches. La densiti dans les creches, mais pas leur formation, est fonction de la temperature. La formation des creches ne se fait qu'apres que les petits ont atteint une taille suffisamment grande pour ne pas etre attaquks par les mouettes et il ne semble pas y avoir d'autres sources de predation. La mesure en laboratoire de la consommation d'oxygkne indique une Cconomie d'knergie Ikgere (15%) mais significative due a l'entassement a 10°C, mais pas a 20 ou a 30°C. Ces risultats indiquent que I'kconomie d'inergie en I'absence des parents est peut-&re un des buts importants de la formation des creches la nuit, chez cette espece. I1 y a des similitudes et des diffir...

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“…N = 10 singles from the lab and 12 from the colony), and fell within the Tb range reported for downy young of this species by Bartholomew et al ( 1953).…”

Section: Laboratory Studiessupporting

confidence: 82%

Some causal and functional correlates of creching in young white pelicans

Evans¹

1984

Can. J. Zool.

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“…Exposure to solar radiation at even moderate temperatures can elevate body temperatures sufficiently to elicit heat stress behaviour, including panting, postural adjustments and shade-seeking. Shade-seeking has been observed in a variety of non-passerine species exposed to solar radiation (Bartholomew et al, 1953;Bartholomew and Dawson, 1954;Bartholomew, 1966;Lasiewski and Snyder, 1969;Lustick et al, 1979;Dawson and Bennett, 1981). Young cormorant (Lasiewski and Snyder, 1969) and pelican (Bartholomew et al, 1953) chicks seek shadows cast by the parent; mobile pelican and heron nestlings actively seek shade outside the nest (Bartholomew and Dawson, 1954); and a multi-component ''integrated thermal defence strategy'' (Salzman, 1982) that couples parental behaviour such as nest site selection and parental shading with cover-seeking behaviour by heat-stressed young has been identified for gulls (e.g.…”

Section: Introductionmentioning

confidence: 99%

Shade seeking by Common Grackle (Quiscalus quiscula) nestlings at the scale of the nanoclimate

Glassey¹,

Amos²

2009

Journal of Thermal Biology

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“…Bartholomew et al (1953) observed young Pelecanus erythrorhynchos slowly immerse their bills in water and then resume gular fluttering. Bartholomew et al (1953) observed young Pelecanus erythrorhynchos slowly immerse their bills in water and then resume gular fluttering.…”

Section: Ornithological Monographs No 22mentioning

confidence: 99%

“…- Figure 15 illustrates positions during landing and the wing movements associated with balance after landing. The head usually is oriented directly forward, and I believe the turned positions of the heads of the young Pelecanus erythrorhynchos illustrated in Bartholomew et al (1953) resulted from their being crowded by the photographer. Landing on the ground or sturdy vegetation usually involves a rather steep descent.…”

Section: Locomotionmentioning

confidence: 99%

Maintenance Behavior and Communication in the Brown Pelican

Schreiber¹

1977

Ornithological Monographs

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A Field Study of Temperature Regulation in Young White Pelicans, Pelecanus Erythrorhynchos

Cited by 36 publications

References 6 publications

Some causal and functional correlates of creching in young white pelicans

Some causal and functional correlates of creching in young white pelicans

Shade seeking by Common Grackle (Quiscalus quiscula) nestlings at the scale of the nanoclimate

Maintenance Behavior and Communication in the Brown Pelican

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