Food web activity. See attach fileFood web activityEcology 373Except for the grasses, the mature leaves and

stems of most of these plants are not verygood food for herbivores.  Most of the herbivores eating woody species (that is, all the plantsexcept the forbs and grasses) eat buds, newly grown twigs before they become very woody,and/or the cambium layer under the bark.Remember that the young of some animal species are born very helpless, and all younganimals are smaller than the adults of the species.  Young animals can sometimes be preyed uponeven though the adults are too large or well-defended to be preyed upon by a particular consumerspecies.

Part 1: Diagram the Texas food web, neatly, on an 8.5 X 11″ sheet of paper.  You may dothis by hand; you need not use the computer to draw this diagram.  

Here are the species that must be included and what they consume:  consumer species  EATS   resource species or species group

fox squirrelforbs, oak treefield mousegrasses, forbsrabbitforbs, grasses, oak treegrasshoppergrasses, forbsgrackle (bird)grasshoppers, forbswhite tailed deerforbs, oak treevulturefox squirrel, field mousebobcatfoxsquirrel, field mouse, rabbit, white tailed deercoyotefoxsquirrel, field mouse, rabbit, white tailed deer

Part 2: Using the artic food web provided (after Krebs et al. 2001; Krebs 2001), answer thefollowing questions. Your answers must be typed and stapled to your food web.

2a. The trophic level of a species is its position in a food chain.  The first trophic level is greenplants (or detritus).  The next trophic level is herbivores (or detritivores).  Trophic level 3 iscomposed of species that eat level 2 species.  Trophic level 4 is composed of species that eatlevel 3 species, and so on.  Determine the trophic level(s) of each species, and list each speciesunder a trophic level.  Don’t forget to include the plant species and fungi.  You will rapidly

discover, I hope, that just like humans, some animal species occupy more than one trophic level.2b. One property of food webs is the average length of the food chains in them.  We will definethe length of a food chain as the number of links in it from its top predator to its basal species.  A

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