Diversity of morphological characters of Apis cerana cerana in the different ecological conditions of South Anhui Mountainous Comparative study on the niches of Apis mellifera ligustica and Apis cerana cerana New mutations in hind wing vein of Apis cerana cerana (Hymenoptera: Apidae) induced by lower developmental temperature Melissopalynology of natural toxic honey and trophic niche analysis of Apis cerana cerana in the Lancang River valley