BioOne contains peer-reviewed articles in the biological, ecological, and environmental sciences. Use the advanced search screen for best results.
JSTOR is a digital library of academic journals, books, and primary sources. Some of its content is now freely available on the Internet. Click on the link below to search for articles.
ScienceDirect allows you to search for peer-reviewed journals, articles, book chapters as well as open access content.
There are a number of Ebsco databases that you should look at to locate articles for this project.
ProQuest is another multidisciplinary database