How do populations grow when there is no resource limitation? How do populations
ID: 85313 • Letter: H
Question
How do populations grow when there is no resource limitation? How do populations grow when there is resource limitation? What arc density-dependent vs. density-independent factors that affect populations? What is the relationship between species niches and competition? That is an r-selected and K-selected species? What types of environments are they more likely to be found in? What do their respective survivorship curves look like? How does disturbance affect species diversity? Why? What are the causes of amphibian declines through in disturbed and protected areas? Describe the impact of prey on predators and predators on prey. Draw a graph showing density-independent growth rate of a population as a function of population size. Now draw the population size through time. Draw a graph showing a population with density-dependent growth rate through time and as a function of population size.Explanation / Answer
8.
Niche is the functional role of an organism/species in an ecosystem. It is like profession of an individual in a company.
For example, the niche of a rose shrub is to synthesize food by photosynthesis and release oxygen. It also provides habitat to small insects.
Competition occurs when niche overlap happens between two different species due to limited resources.
Competition actually shows negative effect on both species but it is essential for natural selection.
9.
r-selection: High reproductive rate, rapid use of resources over a short span and high rates of intrinsic growth.
They show short life span and are opportunistic species. Ex: Parasites\
k-selection: Slow growing and are limited by the carrying capacity of the ecosystem.
High parental care, less reproduction rate and long life span.
Ex: Humans
r-selected species are found in less crowded ecological niches where as k-selected species can survive high competition.
r-selected species show J-shaped population curve where as k-selected species show S-shaped curve.
12.
Predator is the organism that eats another organism.
Prey is the organism that is eaten by predator.\
Examples:
Grain is the prey for sparrow: Grainvore
Grass is the prey for rabbit: Herbivore
Deer is the prey for Lion: Carnivore
Predator and prey maintain a close relationship between them. Predator is careful enough not to consume the entire prey. This would lead to the extinction of both prey as well as predator species.
Similarly predator keeps prey species population in check.
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