Designing an Ecosystem (Help Request)

[Solauren]

Hello Everyone.

Does anyone know where I can get the following types of information

Required food consumption, by species. i.e an adult lion requires 50 pounds of food a week and weights 600 pounds.

For all food-consumption groups (i.e Carnivore, Omnivore, Herbivore)

Also, does anyone know where I can get a rough idea on avialable food by a given geographical region type?

i.e - Desert; 15 pounds of consumable food per 100 square miles, 30 days to regrow.

I'm trying to make up a reasonable, and close to realistic, ecology for a world.

(If you must know specifics, I'm trying to make realistic encounter tables for D&D. I know that's more fantasy, but I want to base is on real world data)

[Shortie]

Wiki I'd guess, or just google:

e.g.
Lions:
Weight: 260 to 500 pounds
Adult females require an average of 11 pounds of meat per day and adult males, 15.4 lbs

Available food per area is a lot tricker however; it's highly dependent on season, and 'available' is pretty complicated, one wildebeast is more likely to feed a lion pride than a herd of twenty. Plus you've got a bunch of different predators, most of whom will scavange in addition to killing fresh.

That said, here are a few rough figures for distribution of lions:
Pride territories range from 40 to 400 square miles.
There can be as many as 30 to 40 members in one pride.
The average size of a pride's territory is 40-50 square miles.
Prides consist of 2 to 18 females and their offspring and 1 to 7 males.