Across
- 3. a mitigation method for assisting eels to go over impoundments
- 8. ecology that looks at the interaction of populations of the species living within a particular area
- 11. the boundary between water at two different temperatures
- 14. zone of shore that is permanently submerged
Down
- 1. least toxic part of total ammonia
- 2. native crayfish found in UK rivers
- 4. non-living factors
- 5. young eels
- 6. a mitigation method for preventing eels from migrating
- 7. how an organism fits into its environment
- 9. bivalve found in uk rivers
- 10. aggressive, non-native mammalian predator
- 12. living factors
- 13. scientific study of the interactions between organisms and the environment
