Research progress on insect diversity

Background & Aims: We reviewed progress on insect biodiversity research over the past 30 years and further analyzed the trends, focusing on varied study systems (e.g.forest, grassland and agriculture etc.) and important functional insect groups, such as pollinators, herbivores and predators.Progresses: Declines of insect abundance and diversity are being reported worldwide.Anthropogenic disturbance, climate change, and other factors contribute to this crisis.Strategies & Prospects: Studies of insect biodiversity have expanded from early comparisons of species richness on composition to multiple dimensions of diversity.Current studies include both in-depth work on morphological diversity and much deeper consideration of genetic, phylogenetic, and functional diversity.Moreover, the studies' scale has expanded from local to global.The development of morphometrics and phylogenetic bioinformatics further contributes to understanding evolution and global patterns in diversity.We also need to pay more attention to topics on integrative taxonomy on functional insect groups, functional diversity, insect diversity within canopy, and species interaction networks.