Given below is a list of autotrophs and heterotrophs. With your knowledge about food chain, establish various linkages between the organisms on the principle of ’eating and being eaten’. What is this inter-linkage established known as? 
Algae, hydrilla, grasshopper, rat, squirrel, crow, maize plant, deer, rabbit, lizard, wolf, snake, peacock, phytoplankton, crustaceans, whale, tiger, lion, sparrow, duck, crane, cockroach, spider, toad, fish, leopard, elephant, goat, Nymphaea, Spirogyra. 

Explanation

To establish the linkages between the given organisms based on the principle of "eating and being eaten," we can categorize them into autotrophs (producers) and heterotrophs (consumers).

### Step-by-Step Solution:

1. **Identify Autotrophs**:
- Autotrophs are organisms that produce their own food through photosynthesis or chemosynthesis. From the list, the autotrophs include:
- Algae
- Hydrilla
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