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  • Date: 05/24/1974
    Resource Category: Peer-reviewed article
    Biological sampling procedures that remove organisms or litter from the system being studied potentially bias the results. Bias can be estimated by considering the experimenter as a consumer in the system, and comparing experimenter consumption to other organisms feeding at the same trophic level. H. T. Odum's classic work is examined in light of ... »
  • Date: 01/01/1900
    Resource Category: Project Descriptions
    The CBC database is the repository of early winter bird observations recorded since 1900. Currently there are over 2100 count circles submitted each year (as of 2008). The database provides information for compilers, regional editors, Audubon conservation staff, ornithologists, academic researchers, federal, state and local wildlife and land ... »