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Table 1.

Nitrogen isotopic composition of the diet before (diet 1) and during(diet 2) the experiment

Type% Nitrogen (mean ± s.d.)δ15N (‰) (mean ± s.d.)
Diet 1 Alete 2.35a 6.49a 
 Honey b b 
 Nektar Plus 0.31±0.12 -0.85±0.68 
 Pollen 3.20±0.42 1.84±1.67 
 Banana 0.53a -0.04a 
Diet 2 Cane sugar 0.07a 13.54a 
 Corn syrup 0.07±0.02 10.30±2.85 
 Agave syrup b b 
 Opuntia fruits 0.71±0.03 5.47±0.05 
Type% Nitrogen (mean ± s.d.)δ15N (‰) (mean ± s.d.)
Diet 1 Alete 2.35a 6.49a 
 Honey b b 
 Nektar Plus 0.31±0.12 -0.85±0.68 
 Pollen 3.20±0.42 1.84±1.67 
 Banana 0.53a -0.04a 
Diet 2 Cane sugar 0.07a 13.54a 
 Corn syrup 0.07±0.02 10.30±2.85 
 Agave syrup b b 
 Opuntia fruits 0.71±0.03 5.47±0.05 

Alete, honey and Nektar Plus were the three main food sources during the initial week prior to the diet switch. In diet 1, food was supplemented by small amounts of pollen and banana. Cane sugar, corn syrup and agave syrup were the three main food sources starting from day one of the experiment. In diet 2, food was supplemented by small amounts of opuntia fruits. Minor food sources are in italic.

a

Single measurement

b

amounts of N were insufficient for measurements

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