The initial stage of your search will be one of informing yourself about a broad topic, and then (with appropriate background) defining a specific area of study, which may involve limiting to specific species and/or ecological settings. You should stay in contact with Dr. Knox to make sure that what you're working on is appropriate from his point of view.
You are (for all intents and purposes) limited to journals we have in our library, including the various online journals (under exceptional circumstances InterLibrary Loan can be arranged, but don't bet the farm on it). That said, there's a lot to be learned from abstracts of articles from sources that are not in our library.
Much of your exploration will be done in online indexes, accessible via the Biology Department page and/or Library Gateway => Research Resources => Periodical Indexes. Choosing amongst the myriad possibilities is part of the fun, and no single source will tell you everything (but every source will tell you something).
Here are some worthwhile/exemplary links to web resources. These aren't the only ones or necessarily the best ones (and they generally aren't 'primary' or 'secondary' sources), but they do give an idea of what web resources can be good for.
It looks to me like most people haven't looked at the Ecology style in sufficient detail to get it right. As I said, it matters. Consider these four examples, and note their peculiarities:
Fowler, S. V., and J. H. Lawton. 1985. Rapidly induced defenses and talking trees: the devil's advocate position. American Naturalist 126:181-195.Osborn, T. G. B. 1909. The lateral roots of Amyelon radicans and their mycorrhiza. Annals of Botany 23:603-611.
Carroll, G. C. 1991. Fungal associates of woody plants as insect antagonists in leaves and stems. Pages 253-272 in P. Barbosa, V. A. Krischik, and C. G. Jones, editors. Microbial mediation of plant-herbivore interactions. John Wiley & Sons, New York, New York, USA.
Andrewartha, H. G. and L. C. Birch. 1954. The distribution and abundance of animals. University of Chicago Press, Chicago, Illinois, USA.