来源：ScienceDaily Sustainability News
Parasites are crucial indicators of ecosystem health, and their absence can signal trouble. Once pristine, Florida’s Indian River Lagoon (IRL) now faces pollution and algal blooms that have damaged essential habitats like seagrass beds. New research finds parasite levels in the IRL are significantly lower than in comparable ecosystems worldwide — 11% lower overall and 17% lower for larval parasites requiring multiple hosts. This sharp decline suggests a disrupted food web likely caused by pollution and habitat degradation, and a less resilient and more vulnerable ecosystem.