means that existing species do not affect the probability that subsequent species will become established. Why do chance events play a role succession? …
The species present now depend on what disturbances occurred in the past
, and which species happened to arrive.
Why do chance events play a role succession RQ?
means that existing species do not affect the probability that subsequent species will become established. Why do chance events play a role succession? …
The species present now depend on what disturbances occurred in the past
, and which species happened to arrive.
What does it mean to say that one species facilitates another species?
What does it mean to say that one species facilitates another species?
The facilitated species grows better in the presence versus absence of the other species
.
What does it mean to say that a plant community provides ecosystem services please look back at p 1154?
What does it mean to say that a plant community provides ecosystem services? ( please look back at p. 1154)
It improves the ability of the abiotic environment to support life.
What does it mean to say that a plant community provides ecosystem services?
What does it mean to say that a plant community provides ecosystem services?
It improves the ability of the abiotic environment to support life
. Scientists estimate that the total value of ecosystem services provided to humans by other organisms is: More than twice the gross national produce of all nations combined.
What is the key difference between primary productivity and net primary productivity?
Terms in this set (10)
What is the key difference between primary productivity and net primary productivity?
Net primary productivity represents just the energy used to build biomass
. Net primary productivity is a small fraction (often ~10%) of primary productivity. What happens to all of the energy that is “lost?”
Which is likely to be more intense fires that occur in the same location frequently or rarely quizlet?
In biology, how is ‘disturbance' defined? Which is likely to be more intense: fires that occur in the same location frequently, or rarely? Rarely, because so
much more fuel will build up over time
.
Why is species distribution important?
Species distribution models
provide a tool for mapping habitat and can produce credible, defensible, and repeatable information with which to inform decisions
. However, these models are sensitive to data inputs and methodological choices, making it important to assess the reliability and utility of model predictions.
How is species distribution determined?
The variance/mean ratio method
focuses mainly on determining whether a species fits a randomly spaced distribution, but can also be used as evidence for either an even or clumped distribution. To utilize the Variance/Mean ratio method, data is collected from several random samples of a given population.
What does a community with many different species indicate?
Species diversity is a measure of community complexity. It is a function of both the number of different species in the community (
species richness
) and their relative abundances (species evenness). Larger numbers of species and more even abundances of species lead to higher species diversity.
How do invasive species affect diversity?
Invasive species are
capable of causing extinctions of native plants and animals
, reducing biodiversity, competing with native organisms for limited resources, and altering habitats. This can result in huge economic impacts and fundamental disruptions of coastal and Great Lakes ecosystems.
What is the biggest reason for the decline in biodiversity?
Habitat loss
is the primary cause of decline for species and populations because it removes the flora and fauna that each species requires for life. When more and more land use occurs within areas of high species richness, loss of biodiversity is greatly exacerbated and species extinctions increase.
What is the most effective way to preserve species diversity?
What is captive breeding? The most effective way to preserve biodiversity is…
contaminating their drinking water, or absorbed into the plants they eat and killing or weakening the
organism.
What services are provided by natural well functioning ecosystems?
| Service type Examples of goods or services provided | Provisional Fiber; Food; Freshwater; Fuel wood and other essential resources | Regulative Climate regulation; Disease control and suppression of pathogens; Water purification and regulation |
|---|
What is provisioning services in ecosystems?
Provisioning Services
A provisioning service is
any type of benefit to people that can be extracted from nature
. Along with food, other types of provisioning services include drinking water, timber, wood fuel, natural gas, oils, plants that can be made into clothes and other materials, and medicinal benefits.
What are the roles plants play in an ecosystem?
Plants form the critical base of food chains in nearly all ecosystems. Through photosynthesis,
plants harvest the energy of the sun, providing both food and habitat for other organisms
. For example, plants are fed upon by insects, which may be eaten by birds, which are in turn are eaten by birds of prey, and so on.
