Some styles you need to learn because you are going to write your citations in them, and some you should recognize so that you can read citations in them. Scientific styles share a few common traits:
There are many, many styles used in different journals and in different subjects. A few of the more common ones biology students will run across are:
Different citation formats serve different purposes, but they all use the same basic information. Author, title, journal, date, volume, issue, pages, etc.
In Biology, the Council of Biological Editors/Council of Science Editors (CBE/CSE) is common. It is similar to APA, but simpler.
Here is an APA citation, similar to the ones produced by many of our library databases:
Haworth, M., Elliott-Kingston, C., & McElwain, J. C. (2013). Co-ordination of physiological and morphological responses of stomata to elevated CO2 in vascular plants. Oecologia, 171(1), 71-82. doi: 10.1007/s00442-012-2406-9
Here is the same citation in CBE (name/year style):
Haworth M, Elliott-Kingston C, McElwain JC. 2013. Co-ordination of physiological and morphological responses of stomata to elevated CO2 in vascular plants. Oecologia 171(1):71-82.
Differences and how to change an APA citation to CBE: