Posts Tagged ‘food web’

I need to calculate the bio magnification for a food web that shows me only the bioamplification of PCB at each step. Their are 5 species. It starts with the phytoplankton which has 0.025ppm of PCB, then the zooplankton with 0.123ppm, then the smelt with 1.04 ppm, then the eggs of the herring gull with 124ppm.

I need to show my work and calculations so if anybody could please explain to me how I can calculate the biomagnification of the PCB at each level using the data givien while showing my work.

thanx so much

Matching:
(words:decomposers, community, food web, food chain, sun, producers, pyramid of energy)
18. energy source
19.water lilies to snails to ducks
20.represedted by a drawing of the lake and its inhabitants
21. food chains with many interconnecting link
22.carnivore populations possess less energy that producer population
23. return matter to the community
24. traps energy from the sun

What is the original source of energy for an ecosystem? Describe how that energy is transferred to different organisms in that ecosystem.

List:
frog, human, hawk, flies, grass, snake, bacteria, mice, grasshopper, flea, rotton fruit, fish

a)name all the producers in the list
b)name all the hervivores in the list
c)name the carnivores in the list
d)name the parasite in the list
e)name the decomposer in the list

Using those words in the list how could i draw a food web using eight of the organisms

Whats the difference btw. food web and food chain

question#1- in a food web,if the number of food chain connections is decreasing,you ‘ll find more
1-species
2-herbivores
3-unrelated spescies
4-carnivores.

question # 2-
which of the following will cause a predator-prey relation to be thrown off balance?
1-food levels remain steady.
2-faster reproducton in prey than in predators.
3- equal reproductiov rates in both species.
4-a third neutral species is introducted into the environment.
please give sure answer.
thanks in advance.

Fill in the blank with ecology vocab words such as omnivores, community, producers, pupulation, haitat trophic level, food chain, food web, herbavore, deccomposer, carnivore, environment, niche,etc

1. ____ eat both producers and consumers.
2.____is a group of populations that live togeather and depend upon each other for food.
3. in a community, the green plants are the_____
4. A group of organisms of the same species in a ______
5. A ____is the place where an organism lives.
6. the total amout of biological matter in a goup of organisms is its_____
7. a ____ represents the transfer of energy and nutrients from one organism to another.
8 the role of anorganism in its environmet(how it goes about obtaining energy) is its____.
9.____feed only on green plants.
10._____recycle dead organisms.
11.____eat herbavores.
12.The _____is the living and nonliving things that surrounds an organism.

I’m working on a project for Biology and my topic for a poster is Ecology-> interconnectedness-> food web not food chain and modle simplification