Responses to sugars and their behavioural mechanisms in the starling (Sturnus vulgaris L.)

Schuler, Werner

doi:10.1007/bf00299671

Cited by 37 publications

(16 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Kare & Ficken, (1963), and Kare and Maller (1967) suggest that positive postingestional consequences, e.g., making up a caloric deficit, may be critical for expression of a sugar preference, as recent work in the starling appears to confirm (Schuler, 1983). Engelmann (1934) also reported that sugar preferences seemed to develop only if sugar and water were regularly presented together.…”

Section: The Behavioral Response To Aversive Stimulimentioning

confidence: 82%

Behavioral reactions to gustatory stimuli in young chicks (Gallus gallus domesticus)

Ganchrow

Steiner

Bartana

1990

Developmental Psychobiology

View full text Add to dashboard Cite

Freely-moving, posthatch chicks were individually presented 2 concentrations each of quinine, citric acid, fructose, sucrose, sodium saccharin, and distilled water and their behavioral reactions were videotaped and analyzed. Already during the first posthatch day distinct rejection responses to quinine and citric acid could be recognized. Prolonged head shaking and beak clapping episodes were the most dominant features of these reactions. While responses to water and sweet stimuli could be interpreted as acceptance behaviors, the resolution was generally not fine enough to discriminate between reactions to the 2 different sweet concentrations of these stimuli or between them and water. When only water or sugar solutions were presented to other hatchlings in a single session, there was a suggestion of more definite acceptance behavior to some sweet stimuli as compared to water. It is concluded that the systems mediating aversive gustatory responses are present and functioning in posthatching chicks while acceptance responses, though present, are less discriminative among stimuli.

show abstract

Section: The Behavioral Response To Aversive Stimulimentioning

confidence: 82%

Behavioral reactions to gustatory stimuli in young chicks (Gallus gallus domesticus)

Ganchrow

Steiner

Bartana

1990

Developmental Psychobiology

View full text Add to dashboard Cite

show abstract

“…from the Sturnid-Muscicapid lineage) are unable to assimilate sucrose efficiently as they lack the enzyme sucrase (Schuler 1983;Martínez del Rio 1990;Martínez del Rio and Restrepo 1993;Levey and Martínez del Rio 2001).…”

Section: Introductionmentioning

confidence: 99%

Food intake rates, assimilation efficiency, and transit times of Knysna (Tauraco corythaix) Turacos fed South African indigenous fruit

Wilson

Downs

2011

J Ornithol

View full text Add to dashboard Cite

Fleshy-fruited plants and frugivores share a mutualistic relationship with plants offering the frugivores a reward of fleshy fruit pulp in order to disperse their seeds. However, all fruits are not equal in terms of energy available to frugivores. Consequently, we measured the assimilation efficiencies of fruits of six indigenous tree species for an avian frugivore, the Knysna Turaco (Tauraco corythaix). We predicted that the Turacos would process these indigenous fruits efficiently and have fast transit rates and high intake rates irrespective of species. Fruits were fed to the Turacos in separate trials to determine daily food and energy intake, assimilation efficiencies and digestive transit times. Digestive transit times of Knysna Turacos (c. 12-28 min) fall within the range of published examples for other frugivorous birds. Apparent assimilation efficiencies of the fruit ranged from c. 15-84% and were generally lower than those observed for other avian frugivores. Intake rates (in terms of wet weight) varied among the fruit species, and Knysna Turacos had greater intake rates on fruit which they are able to assimilate efficiently. Future studies looking at the nutritional composition of indigenous forest fruit may provide insight into the Knysna Turacos assimilation efficiency and consequently their food preferences and role as potential seed dispersers of fruiting tree species. ZusammenfassungNahrungsaufnahmeraten, Verdauungseffizienz und Transitzeiten von Helmturakos (Tauraco corythaix), die mit einheimischen sü dafrikanischen Früchten gefü ttert wurden Pflanzen mit fleischigen Früchten und Fruchtfresser stehen in mutualistischer Beziehung-die Pflanzen bieten den Fruchtfressern eine Belohnung in Form von Fruchtfleisch, und diese verbreiten ihre Samen. Allerdings sind nicht alle Früchte gleichwertig im Hinblick auf die Energie, die für die Fruchtfresser nutzbar ist. Wir haben daher die Assimilationseffizienz von Früchten von sechs einheimischen Baumarten für einen fruchtfressenden Vogel, den Helmturako (Tauraco corythaix), gemessen. Wir haben vorhergesagt, dass die Turakos diese einheimischen Früchte effizient verarbeiten und schnelle Transitzeiten und hohe Aufnahmeraten haben, unabhängig von der Fruchtart. Die Früchte wurden den Turakos in separaten Versuchen gefüttert, um die tägliche Nahrungs-und Energieaufnahme, die Assimilationseffizienz und die Passagezeiten durch den Verdauungstrakt zu ermitteln. Die Transitzeiten der Helmturakos (ca. 12-28 min) fallen in den Bereich publizierter Beispiele für andere fruchtfressende Vögel. Die offensichtlichen Assimilationseffizienzen für die Früchte reichten von ca. 15-84% und waren allgemein niedriger als die für andere fruchtfressende Vögel beobachteten Werte. Aufnahmeraten (im Hinblick auf Feuchtmasse) variierten zwischen den Fruchtarten und waren höher für diejenigen Früchte, welche die Helmturakos effizienter verdauen können. Zukünftige Studien, welche die Nährstoff-zusammensetzung einheimischer Waldfrüchte untersuchen, könnten Einblicke in die Assimilationseff...

show abstract

“…Several studies have shown that some families from the Sturnid-Muscicapid lineage are unable to digest sucrose efficiently (Schuler, 1983;Martínez del Rio, 1990;Martínez del Rio and Restrepo, 1993;Levey and Martínez del Rio, 2001). This is explained by a lack of the enzyme sucrase in these species, without which sucrose cannot be hydrolysed into glucose and fructose, which can be easily assimilated (Martínez del Rio et al, 1988;Martínez del Rio and Stevens, 1989;Karasov and Levey, 1990;Malcarney et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Digestive efficiency of Knysna and purple-crested turacos fed varying concentrations of equicaloric and equimolar artificial fruit

Wilson

Downs

2011

Journal of Experimental Biology

View full text Add to dashboard Cite

SUMMARYAvian frugivores have been somewhat poorly studied with regards to the effects that different fruit sugar types and concentrations have on their digestive efficiencies. Therefore, two relatively large South African frugivores, the Knysna turaco (Tauraco corythaix) and the purple-crested turaco (Gallirex porphyreolophus), were fed artificial fruit that contained equicaloric and equimolar concentrations of different sugars, to determine their daily food and energy intake, digestive efficiencies and digestive transit times. The artificial fruit contained 6.6, 12.4 or 22%, or 0.42, 0.83 or 1.66moll -1 sucrose or glucose. Food intake of both turaco species increased with decreasing sugar concentration and molarity, irrespective of sugar type, suggesting compensatory mechanisms for energy requirements. Apparent assimilation efficiencies of both turaco species ranged from 61.4-90.0% and 60.2-92.4% for equicaloric and equimolar artificial fruit diets, respectively. Digestive transit times for both turaco species were slowed with an increase in sugar concentration and molarity, irrespective of sugar type. Consequently these two frugivores appear to be tolerant of sugar type and would be expected to select fruits based on energy yields. Future studies of the composition of indigenous forest fruit sugars may give insight into food preferences of the turaco species and their role as potential seed dispersers of fruiting tree species.

show abstract

Responses to sugars and their behavioural mechanisms in the starling (Sturnus vulgaris L.)

Cited by 37 publications

References 23 publications

Behavioral reactions to gustatory stimuli in young chicks (Gallus gallus domesticus)

Behavioral reactions to gustatory stimuli in young chicks (Gallus gallus domesticus)

Food intake rates, assimilation efficiency, and transit times of Knysna (Tauraco corythaix) Turacos fed South African indigenous fruit

Digestive efficiency of Knysna and purple-crested turacos fed varying concentrations of equicaloric and equimolar artificial fruit

Contact Info

Product

Resources

About