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"According to the journal Nature, forest edges - the borders between denser inner forests and their surroundings - could be a place of focus for mitigating loss of forest habitats and the creatures that live there. An overwhelming '85 percent of species are affected, either positively or negatively, by forest edges' (Pfeifer 187)."
Pfeifer, M., et al. "Creation of Forest Edges has a Global Impact on Forest Vertebrates." Nature, vol. 551, no. 7679,9 Nov. 2017, Pp. 187-191.

Is this source credible or not credible, and why or why not?
1 This source is not credible because it contains a biased opinion that cannot be proven.
2This source is credible because it contains specific information about the subject. 3This source is credible because it is a peer-reviewed journal and was published recently.
4The source is not credible because it is clearly politically influenced.

According to the given excerpt, the words of an author is quoted, talking about forest edges and the potential way it could affect the rest of the forest.

The source of this information is credible because it is credible because it is a peer-reviewed journal and was published recently.

A reliable source of information is one that is thorough, well thought of, and sound in theory and argument.