Desert Ecosystem Crossword

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Across
  1. 4. _____ consumers are the top level of the trophic structure
  2. 7. _____ abundance is the proportional representation of a species in a community
  3. 9. _____ succession is when ecological succession begins in a virtually lifeless area with no soil
  4. 10. dead material produced by organisms on all trophic levels
  5. 14. _____ species is a species whose impact is larger on its community relative to its abundance
  6. 16. _____ species is a non-native species that spreads beyond the point of introduction and causes environmental/ecological damage
  7. 18. _____ consumers include mostly small mammals
  8. 19. biological _____ is the intentional release of a natural enemy to attack a pest population
  9. 21. _____ factor is a living organism that shapes its environment
Down
  1. 1. species _____ is the number of different species in a community
  2. 2. _____ consumers get their energy from secondary consumers
  3. 3. _____ succession occurs where a disturbance has cleared away en existing community but leaves soil
  4. 5. feast on detritus
  5. 6. the diet of these organisms s made up of decaying organic material
  6. 8. organisms that produce their own sources of energy
  7. 11. secrete enzymes that digest molecules in organic forms into inorganic forms
  8. 12. organisms that rely on other organisms as a source of energy
  9. 13. _____ consumers include mostly herbivores
  10. 15. a network of interconnecting food chains that shows what animals eat in an ecosystem
  11. 17. _____ succession occurs when disturbed areas are colonized by a variety of species which are gradually replaced by a succession of other species
  12. 20. linear network that connects organisms based on what they eat