1. Community Interactions

2. Community interactions, such as competition, predation, and various forms of symbiosis, can powerfully affect an ecosystem.

3. Competition – when organisms attempt to use a resource at the same place and the same time. Predation – when one organism captures and feeds on another organism.

4. Symbiosis In a symbiotic relationship at least one of the organisms directly benefits from its close association with the other organism. There are three types of symbiosis.

5. Symbiotic Relationships A symbiotic relationship where both organisms benefit EX: Cowbirds eat the bugs off of a cow’s back A symbiotic relationship where 1 organism benefits and the other is unaffected Ex: When cows walk through a field it stirs up bugs and birds eat the bugs A symbiotic relationship where 1 organism benefits and the other is harmed. Ex: A tick feeds on the blood of a dog

6. Commensalism One species benefits and the other gets no real benefit or harm.

7. Commensalism Bromiliad and tree – the higher the bromiliad on the branches, the more sun

8. Commensalism Shark and Remora – remora eats food scraps from sharks meals.

9. Commensalism Barnacles and Whale – Barnacles are moved to feeding grounds by riding on the whales.

10. Mutualism Both species benefit from the relationship

11. Mutualism Clownfish gets – protection and home Anemone gets – cleaned and brought food

12. Mutualism Eel gets cleaned by removal of parasites Shrimp gets food

13. Mutualism Same as before

14. Parasitism One species (the parasite) benefits, but in doing so, harms the other (the host).

15. Parasitism Mosquito – takes blood for food Humans – loss of blood and possible infection

16. Parasitism Tick – blood for food Mammal – loss of blood and possible infection

17. Parasitism Mistletoe – takes nutrients from the tree. Tree – loss of nutrients and loss of leaves, possible disease.