Husky's have a naturally thick coat while other dogs just adapt to colder weather.
-The adaptation of sled dogs best describes adaptation at the _____ level while the dog exposed to seasonal colder tempratures has ______.
Regional; Natural selection at the individual level
Evolution occurs as a result of
better survival or reproduction rates by individuals with a particular characteristic
A physiological modification used to adapt to environmental conditions
Leaves Becoming thick and leathery on a plant growing in a dry hot climate
Natural selection will ultimately make a species
better adapted to its environment
Regular lawn mowing selects for short-headed rather than tall-headed dandelions because
short flowers have less competition when the lawn is mowed often.
Tolerence limits are_____that limit a species' survival.
any environmental conditions
A species can withstand a high range of pH as an adult but the juveniles can only withstand a narrow range of pH. The abiotic factor, pH would best be described as a
Which fish species would be the best indicator of clean, well-oxygenated water? Carp, Largemouth Bass, Catfish, Rainbow Trout, or Sunfish?
the place or set of environmental conditions in which a particular organism lives
total way of life or role of a species in an ecosystem. It includes all physical, chemical, and biological conditions that a species needs to live and reproduce in an ecosystem.
Populations are most critically limited by
Available Food, Suitable shelter from the elements, available water, and suitable shelter from preditors depending on the system.
Indicator species, such as lichens, generally have a ______ tolerence range for a _______.
native to or confined to a certain region
A species can withstand a narrow range of temperatures. Above 100 degrees F there are no species present. In the range from 97 to 100 and 90 to 94 there are a few species present. Below 90 Degrees F there are no species present.
What would you lable the range of temperature from 90 to 94 Degrees F for this particular species?
Zone of physiological stress
What would you label the range of temperature from 95-96 degrees F for this particular species in the scenario?
A generalist is a species that
Occupies a variety of ecological niches
Certain night active moths and day active birds are specialized nector feeders. How do these species coexist if they are using the same food resource?
They do not compete for the nectar because they feed at differ times of day.
Humans can best be described as?
Resources partitioning leads species to
-Feed at different times
-Utilize slightly different prey
-Develop different physiological adaptations
-Live in slightly different regions
*All of these would be a result of resouce partitioning
Resource Partitioning tends to lead to high degree of _____ in a species.
Intraspecific competition is competiton among _____ for resources.
Members of a single species
Not common strategy for successful interspecific competition are
-Eating prey before they are "ready" (ripe) for other species
-spreading seeds or offspring far and fast
-Producing substances that are toxic to competitors
-The life cycle of dragonflies (the larva live in the water)
*These are all not common stratgies of for successful interspecific competition.
An especially effective strategy for reducing intraspecific competition is
Different ecological niches for juveniles and adults
A relationship in which both species benefit
In the partnership of a lichen, the fungus provides _______ and the relationship is best described as ____.
Structure and moisture-holding ability; mutualism
A keystone species is a species whose prescence
Influences the population size of many other species in its community.
In a commensal relationship
One species benefits while the other neither suffers nor benefits.
A biological community's productivity is a measure of
The amount of biomass produced in the community
"Abundance" describes the total number of _____ while "diversity" describes the number of _____.
Organisims in a community; species in a community
in a biological community where diversity is great, such as a tropical rainforest, the abundance of any one species is likely to be
As a rule, near the Earth's north and south poles
Abundance is high and diversity is low
Complexity in an ecological community has to do with the number of
Species at eac trophic level
A community with hundreds of different types of primary producers, a few herbivores and only one carnivore, has
A community that changes very little over time is said to have great
In the coastal forest of Oregon an area was clear-cut for logging. Trees at the edge of the clearing and 200 meters into the forest died within a few months after the logging began. What is the best explanation for the death of the trees?
Abiotic edge effects, such as increased herbivory, negatively affected the trees.
A "closed community" has a
A climax community is on that
Is relatively stable and long lasting
Primary sucession occurs when a community develops _____ while secondary succession occurs when one _____.
On unoccupied ground; biological community replaces another
As ecological developments proceeds, a bilogical community
becomes more diverse
The most common reason that introduced species cause trouble is because they
Disrupt pre-existing niches
Migrations is likely to cause the extinction of a native species when?
The introduction of a predator onto an island originally free from predators
A biome is described by
Broadly similar environmental conditions
Location of specific biomes can be predicted based on
Percipitation & Temperature
Cloud forests are found in _____ areas in tropical regions.
a biome absent from north America is the
Examples of specializations that plants in the desert may have are
-Storing water in their stems and roots
-reducing water loss with thick epidermal layers
Tropical seasonal forests are specially adapted to tolerate
annual cycles of severe drought and heavy rain