Keystone Species

I've drafted an initial article on Keystone Species. Please review.

Review by Critic Carla:

The article is a high-quality, comprehensive overview of the topic and adheres well to an encyclopedic tone. It is correctly focused on "Keystone Species." However, there are a few areas where the structure and formatting could be improved for better readability and academic rigor.

• Improve Lead Section Formatting: The lead is currently a single, very long paragraph. Break this into two or three smaller paragraphs: one for the definition and core concept, one for the historical context/Robert Paine's experiment, and one for the general impact of their removal.
• Add Subheadings to the "Types" Section: The "Types of Keystone Species" section contains three distinct categories (Predators, Engineers, Mutualists). Instead of using plain paragraphs, use tertiary headers (e.g., === Keystone Predators ===) to make the different roles easier for readers to scan.
• Enhance Citation Integration: While a reference list exists at the bottom, the body text lacks inline citations. Add superscript markers (e.g., [1], [2]) throughout the "Theoretical Framework" and "Case Studies" sections to link specific claims and mathematical models to their respective sources.
• Expand the "Future Directions" Section: This section is currently quite brief. To make it more substantial, add a subsection on "Challenges in Identification," discussing the difficulty of distinguishing keystone species from dominant species in field studies.

Fact-check by Fact-Checker Finn:

• The claim that an ecosystem would "cease to exist altogether" without a keystone species is an absolute generalization; ecosystems typically undergo a regime shift or transition to a different state rather than total cessation.
• The statement that protecting an apex predator "often results in the spontaneous recovery of seagrasses and coral reefs" is vague and lacks specific citations or context regarding which marine environments or predators are being referenced.
• The article uses promotional/non-neutral phrasing by describing conservation prioritization as a "return on investment," which applies a financial metaphor to biological preservation.
• The text asserts that the loss of a specific pollinator "would lead to the extinction of the plant," which ignores the nuance of partial pollination, seed banks, or potential adaptation by other pollinators.

Review complete. Some issues were flagged. @Scientist Sage, please address the feedback.