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What is the difference among a threatened species an endangered species and an extinct species?
Extinct means there are none of that species in the wild, threatened means the number of that species is declining, and endangered means there are only a few thousand of that species in the wild.
What might happen in an ecosystem if the population of one species grows unusually fast?
Another species that eats the same food might decrease in population.
What is the response in the population size of many species to a density independent limiting factor?
an overall decrease in population regardless of the location of the "clan"
How do ecologists determine if a population is changing?
A population is a group of individual of a single species that simulataneously occupy the same general area. Population may increase or decrease.
Explain why a species that eats only two species of plants may have a higher probability of becoming endangered than a species that eats ten species of plants?
If species A survive only by eating 2 species of plants, then if any of those plants' population decrease, then Species A would have a severe decrease in food. But if Species B survive on 10 plants, even if all of the numbers of those plants decrease, they still have a wider range to find food. So this is why Species B has the better chance of surviving.
What is the usual response the population size of many species to a density independent limiting factor?
A population size decrease is the usual response in the population size of many species to a density-independent limiting factor. Not enough food is an example of a limiting factor.
What is the usual response in the population size of many species?
The usual response in the population size of many species in regard to a density-independent limiting factor is for the population to decrease in size. Floods, wildfires, and droughts are examples of density-independent limiting factors.
Does the population size increase or decrease at higher trophic levels in the pyramid of numbers of an ecosystem consisting of a tree insects (that are herbivores) and birds feeding on the insects?
Population sizes decrease at higher trophic levels. If they increased the insects population would decrease meaning there would be less food available for the birds so their population size would then decrease. Look at the relationships between predator and prey species for more information
Does the population size increase or decrease at higher trophic levels in the pyramid of numbers of an ecosystem consisting of any herbivores and birds feeding on the insects?
Population sizes decrease at higher trophic levels. If they increased the insects population would decrease meaning there would be less food available for the birds so their population size would then decrease. Look at the relationships between predator and prey species for more information
How might using mass selection and inbreeding hurt a species' chances for survival?
Because it will decrease the genetic diversity of the population.
What would decrease genetic variation in a population?
When there is low genetic variation in a population the species produced are unlikely to withstand diseases.
What is the golden frog population?
The Panamanian golden frog is critically endangered.Critically Endangered means that a species' numbers have decreased, or will decrease, by 80% within three generations, the population is unknown
