This is a preview. Log in through your library . Abstract Criteria for selecting sites are described and the various sampling, rearing, and identification techniques used to investigate field S.

Bees (family: Apidae) are important ecologically and economically as primary pollinators of many natural and agricultural systems. Given current concerns about declining numbers of bees, many ...

1. Research that yields conflicting results rightly causes controversy. Where methodological weaknesses are apparent, there is ready opportunity for discord within the scientific community, which may ...