Disruption of connectivity increases vulnerability to disturbances. Which option describes this effect?

• A. No effect
• B. Increased vulnerability to disturbances
• C. Increased nutrient export
• D. Decreased vulnerability to disturbances

Answer: (B)

Connectivity in freshwater systems lets organisms move between habitats, exchange energy and nutrients, and recolonize areas after disturbances. When that connectivity is disrupted, the system can’t rebound as easily from disturbances—populations can’t immigrate into damaged spots, larvae and other propagules may not reach suitable habitats, and nutrient and energy flows are hindered. This reduces resilience, making the ecosystem more likely to suffer lasting impacts from disturbances. So the description that best matches this is increased vulnerability to disturbances.

Other options either imply no change, suggest the opposite (decreased vulnerability), or describe a related outcome (like more nutrient export) that isn’t the direct way connectivity loss increases risk to disturbances.