Effect of the Colony Densities of Apis mellifera on the Foraging Behavior of Apis cerana

• Xiaoxiao REN, 
• Boda MENG, 
• Wenzheng ZHAO, 
• Xueyang GONG, 
• Xinlan CHEN, 
• Yongquan HUANG, 
• Danyin ZHOU, 
• Kun DONG