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the relational position of a species or population in its ecosystem to each other; e.g. a dolphin could potentially be in another ecological niche from one that travels in a different pod if the members of these pods utilize significantly different food resources and foraging methods.
A shorthand definition of niche is how an organism makes a living.
The ecological niche describes how an organism or population responds to the distribution of resources and competitors (e.g., by growing when resources are abundant, and when predators, parasites and pathogens are scarce) and how it in turn alters those same factors (e.g., limiting access to resources by other organisms, acting as a food source for predators and a consumer of prey).

I have a project about ecology due in 2 days. I picked the Walrus as my topic. I need to know what role does it play in the ecosystem and the relationships and interactions it has in its community!!!

ACROSS:
use energy for homeostasis
living things in their environment
heterotrophs
sequential re-growth of species
eats both meat &plants
CO2 & carbohydraytes are in this cycle
ticks, fleas, lice, lampreys…
manufacture their own food
deceptive or warning camouflage
your narrow niche makes you this
density (?) factors reduce popn due to its size
cycle that includes ammonification & fixation
tapeworm, roundworm, hookworm…
where Earth + atmosphere = life support
consumed by predator after the hunt
in commensalisms, only 1 species does this
S-curve, or growth where births = deaths
community very resistant to change
DOWN:
ecosystems waste recycler
total organic material in an ecosystem
dependent on tolerable environmental conditions
birth ___; death ___; mortality ___
species lifestyle &habitat determine this
nonliving
species (?) suggests ecosystems health
popn size the area can support (2words)
type of exclusion that drives 1 species out
large ecosystem w/distinct characteristics
earths insulation
close interactions among species
stable end point community
density-independent (?) hurt popn regardless of size
decomposers break this down

i forgot my biology book at school and i need help with these questions. any answer helps, i prefer complete sentence if you are willing, but if not, thanks anyway. so here are the questions.
1 What is ecology?
2 define: species; population; community; ecosystem; biome; biosphere;
Tell how these are related.
3 How is a habitat different from a niche;
4 What are biotic and abiotic factors?
5 What is the Competitive Exclusion Principle?
6 How is the movement of matter AND energy through an ecosystem different?
7 What are autotrophs? Give examples. What are heterotrophs? Give examples.
8 Name two ways autotrophic organisms can make their own food. How are these different?
9 What is a resource? A food chain? A food web? How are these related?
10 What is an herbivore, carnivore, omnivore, detritivore, decomposer,scavenger?
11 How do they get their energy? Be able to give examples of each of these.
12 What is a trophic level? What percentage of energy is passed on from one trophic level to the next?
13 What is a biogeochemical cycle?.
14 How do (water, carbon, nitrogen, phosphorus) atoms enter and leave the atmosphere, land, water, and cycle through the ecosystem?
15 In which cycle does the atmosphere NOT play a role?
16 Which biomolecules are important to living things and which cycles provide the atoms to build these?
17 What is transpiration? Nitrogen fixation? Denitrification? Evaporation? Condensation? Precipitation?
18 Which organisms play a role in these processes?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~…
19 NAME the 6 levels or organization that ecologists use
20 What are the ways organisms interact in an ecosystem? Define:(Competition, Predation, Symbiosis)
21 Name the 3 kinds of symbiosis? Identify examples of each?
21 What are some things organisms must compete for?
22 What is a limiting factor? How does it affect a population?
23 What is primary productivity? An algal bloom?
24 What happens when an over abundance of a limiting factor becomes available?
25 How do organisms cooperate? What is predation? What is a predator? Prey?
26 What are the 3 kinds of symbiosis? Be able to identify examples of each?
27. Name the two things that can affect the size of a population
28. What is exponential growth? Under what conditions does it occur in a population?
29. What is logistic growth?
30. Give two examples of density-dependent limiting factors? What does this type of limiting factor
rely on?
31. What is the difference between primary and secondary succession?
32. What kind of growth is represented by a S curve (as opposed to a J curve)
33. Explain the difference between a resource that is renewable and nonrenewable.
you do not have to answer all of them (you’d be AWSOME if you did though(: ) but try to answer one that hasnt been answered yet. THANK YOU!(:

Science Packet Questions:
Which is a biotic factor that affects the size of a population in a specific ecosystem?
a. average temperature of the ecosystem b. type of soil in the ecosystem
c. number and kinds of predators in the ecosystem d. concentration of oxygen in the ecosystem
During a long period when there is no rainfall, a mountain lion may temporarily leave its usual hunting territory to drink from a farm pond. This behavior is probably due to
a. its need to find different food to eat
b. the change in an abiotic factor in its environment
c. its need to find a new habitat
d. the change in a biotic factor in its environment
An organism’s niche is
a. the range of physical and biological conditions in which an organism lives and the way in which it uses those conditions
b. all the physical and biological factors in the organism’s environment
c. the range of temperature that the organism needs to survive
d. a full description of the place an organism lives
Several species of warblers can live in the same spruce tree ONLY because they
a. have different habitats within the tree
b. eat different foods within the tree
c. occupy different niches within the tree
d. can find different temperatures within the tree
An interaction in which one organism captures and feeds on another organism is called
a. competition b. sybiosis c. mutualism d. predation