Pre-Lab 12: Community Strdetul 1 Consider the fotowing austic foosd web, and ass

Question

Pre-Lab 12: Community Strdetul 1 Consider the fotowing austic foosd web, and assqe a trophic position (producer or uaternary consumer) to the following organisms A: Phytoplankton: Primar ary erobuce 8: Crab: Primar C: Blue whale: 5e con con sum ?? D: Leopard seal: 2. The North American cougar once was prevalent across North America. Today, however, due to hunting and habitat loss, they are virtually nonexistent in the eastern United States. When cougars were present, ane of their prey species was white-tailed deer, which are herbivorous. What effect do you think the decrease in the cougar population has had on the food chain in their community? 3. Briefly explain the difference between a dominant species and a keystone species. Communities

Explanation / Answer

2. The loss of predator in the (American cougar) , can result in the phenomenon known as “trophic cascade” in which the change , whether (increase or decrease), result in predator population resulted in the balance of food chain . As, predator , in this case , (American cougar), become reduced, the overall number of deer will increase. This will effect on the establishment context of plant species. May be the population of specific plant species get reduced or get extinct on which deer feed.

3. In ecosystem, dominant species is the one that is most abundant and it share the highest percentage of total biomass in an ecosystem whereas keystone species is the one that have maximum effect on other species in an ecosystem. Dominant species number is highest in an ecosystem whereas keystone species does not have maximum number.

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