You annotate a source by writing 1-2 paragraphs that:
Cite the source using Ecology style above the annotation.
Ecology is a style by the Ecological Society of America, used primarily in it's journals Ecology, Ecological Applications, and Ecological Manuscripts.
In Ecology style, each source is cited in-text and in the "Literature Cited" list at the end of your paper.
are simply the author's (LastName Pub. Year) .
If there are more than three authors, use (FirstAuthor'sName et al. Pub Year)
Works Cited List
Last name, First initial. Second initial. Date. Article title. Journal title. Volume number:first page-last page.
More information can be found at ESA's "Preparation of Manuscripts" Guide
At the end of the day, you are writing this paper to share your original research with the world, or at least a portion of the scientific community. The data, and interpretation of other people's research is important because it gives context to what you are presenting. Their specific words are usually not important to you.
When you introduce an outside source, within a lit review or elsewhere in the paper, you want to discuss and analyze it. Why is this source important to your research? How is it similar/different from other sources as well as the research you will present.
To paraphrase is to pull the ideas from a source, and put them in your own words within a paper. This gives you more room for your own ideas and commentary.You still need to cite the source at the end of your paraphrase, to give credit for the ideas and help your reader find the source.
Quotes are tempting- they're already written for one. It seems like a neat bundle of words that could give support to your ideas. But quotes are not used often, especially in the sciences. If a quote is particularly notable, grand, interesting, and you think you could not get anything close to the same effect by paraphrasing- talk to your professor, a librarian, or someone at the learning center. If you do wind up using a quote, and most of you won't, be sure to cite it.
It is important to note that the ESA states that in Ecology style you should site only sources essential to the paper and make an effort to not cite excessively. In this instance, a quotation might be seen as an inessential citation.