While Wikipedia can sometimes be a good starting point, it is not considered "scholarly." If you are you having trouble distinguishing between the peer-reviewed/scholarly journals from the trade publication or popular magazines, Below is a link to a document that will help explain the differences.
REVIEW VERSUS RESEARCH
It is also important to be able to distinguish between review articles and research articles. A review article’s primary purpose is not to present new research, but to summarize, analyze, discuss, and provide an overview of previously published work on a topic. A research article is designed to present new research, methods, and/or findings. Research articles often employ the IMRAD (Introduction, Methods, Research, and Discussion) format. Below are a few articles of interest on this topic.
"consume dead organisms"
"eat producers and consumers"
"tall grass prairie"
Or, sometimes called a Survey of the Scholarship.
A literature review is a text written by someone to consider the critical points of current knowledge including substantive findings, as well as theoretical and methodological contributions to a particular topic. Literature reviews are secondary sources, and as such, do not report any new or original experimental work. Also, a literature review can be interpreted as a review of an abstract accomplishment.
Most often associated with academic-oriented literature, such as a thesis or peer-reviewed article, a literature review usually precedes a research proposal and results section. Its main goals are to situate the current study within the body of literature and to provide context for the particular reader. Literature reviews are a staple for research in nearly every academic field.
Check out these databases if you are looking for scholarly articles.
Below are some databases that will be more relevant/useful for the "sciences." Be sure to "scroll" down through the box to see additional choices.
There is a lot of content in this box, be sure to scroll down for additional tips/techniques.
If you need a better understanding of Boolean logic and searching, here are a few resources to help: