Zusammenfassung
Energieregulation und Terminierung der Nahrungsaufnahmen wurden an der andinen KolibriartAglaeactis cupripennis experimentell untersucht (biometrische Daten s. Tab. 1). ♂ erzielten eine lineare Nettoenergieakkumulation von 15 210 J±993 SD (n=2); ♀ von 16 131 J±2811 (n=4). Der durchschnittliche Nettoenergiegewinn beider Geschlechter war signifikant verschieden. Die Nahrungsaufnahme erfolgte im Sitzen. Die durchschnittliche Länge einer Nahrungsaufnahme betrug bei ♂ 7,6 s±5,7 (n=129), bei ♀ 5,0 s±3,0 (n=197). Die Korrelation zwischen Nahrungsaufnahmelänge und Körpermasse bei beiden Geschlechtern war signifikant, ebenso eine negative Korrelation zwischen dem Zeitpunkt der Nahrungsaufnahme und der Körpermasse und eine positive Beziehung zwischen aufgenommenem Nahrungsvolumen und Körpermasse (r=0,72; n=6) sowie zwischen der Nahrungsaufnahmelänge und der anschließenden Fastenzeit. Kein Zusammenhang ergab sich zwischen der Länge einer Nahrungsaufnahme und der vorausgegangenen Fastenzeit. Die Flugaktivitäten sind bei ♂ mit dem aufgenommenen Nektarvolumen korreliert, nicht jedoch bei ♀. Dies deutet auf unterschiedliches Territorialverhalten hin. Bei experimentell erzwungener Nahrungsaufnahme im Schwirrflug war die Nahrungsaufnahme signifikant kürzer als im Sitzen; auch nahm der Versuchsvogel dabei deutlich weniger Nektar pro Mahlzeit auf.
Die getesteten Kolibris zeigten einen proportional gesteuerten Energiekontrollmechanismus, der sich ab einem unteren Grenzwert linear reguliert.
Summary
Energy accumulation and timing of feeding in the Andean hummingbirdAglaeactis cupripennis (body mass and other mensural characteristics see Tab. 1) were studied under laboratory conditions: photoperiod LD 12:12, ambient temperature 17°C, rel. humidity 70%–80%; nectar consisted of a 0.5 mol sucrose solution available ad lib. Each bird was individually tested in an aviary.
♂ achieved a linearly accumulated net energy gain [=(energy consumed — energy excreted) — energy expended] of 15 210 J±993 SD (n=2); ♀ gained 16 131 J±2811 (n=4). The average net energy accumulated in both sexes was significantly different (p<0.01). When the birds were allowed to feed while perching, as they normally do in the wild, the average feeding bout lastēd in ♂ 7.6s±5.7 (n=129), n ♀ 5.0s±3.0 (n=197). The correlation between feeding bout length and body mass in ♂ and ♀ was significantly different. There was a significant negative correlation between the time of feeding and body mass (p<0.01) and a positive relationship between nectar volume consumed and body mass (r=0.72, n=6). A significant correlation was found between feeding bout length and subsequent fasting period (p<0.05); no relationship was observed between feeding bout length and previous fasting period. Time spent flying (forward flight and hovering) was correlated with consumed nectar volume in ♂ only. We assume different territorial behaviour patterns in both sexes. In a bird forced to hover for food time spent feeding was significantly shorter than at perching (p<0.01); further, the bird consumed less nectar per feeding bout than at perching.
Our data onAglaeactis cupripennis suggest a proportional control of energy regulation producing linear responses below a certain set point.
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Schuchmann, KL., Abersfelder, F. Energieregulation und Zeitkoordination der Nahrungsaufnahme einer andinen Kolibriart,Aglaeactis cupripennis . J Ornithol 127, 205–215 (1986). https://doi.org/10.1007/BF01640563
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DOI: https://doi.org/10.1007/BF01640563