Melissopalynology of natural toxic honey and trophic niche analysis of Apis cerana cerana in the Lancang River valley 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 Primary studies on evaluation of an ecosystem service for pollination on crop: a case study from Laojunshan in Lijiang region Diversity of morphological characters of Apis cerana cerana in the different ecological conditions of South Anhui Mountainous Effects of nectar secondary compounds on pollination of co-flowering species in a natural community