Enviro ch 4&5
Non-native species can spread rapidly if they find a new location with favorable conditions, often because they do not face the same _______ that they face in their native niches.
Predators
Species can, over a long period of time, develop adaptations that allow them to reduce or avoid competition by sharing resources. This is called _______?
Resource partitioning
What is succession that begins in an area where an ecosystem has been disturbed, removed or destroyed and that contains soil or bottom sediment?
Secondary succession
If multiple species find themselves competing for the same resource, the competition can be reduced by which of the following?
resource partitioning
The role a species plays in its ecosystem is its ____.
Ecological niche
What describes an organism that is too old to reproduce?
Elderly
In some habitats, the extinction of certain amphibian species could lead to the ________ of certain species of other amphibians, aquatic insects, reptiles, birds, fish and mammals.
Extinction
A species with a broad niche is considered a(n)...
Generalist species
Today, the _____ is among the most threatened species in the world, with only 1,600 to 3,000 individuals in the world.
Giant Panda
A measure of the relative abundance, or the numbers of individuals of each species present, is called _____.
Species evenness
The capacity to withstand external stress and disturbance is called _______.
Stability
Which of the following is true?
The higher the species richness, the more the sustainability
Which of the following does not describe an element of an ecological niche?
The place where a species lives
Which of the following is true of specialist species?
They can tolerate a narrow range of climatic conditions
If the resilience of a damaged ecosystem is low enough, the damaged area may not be restored by secondary succession. When this happens, the damaged ecosystem has reached ______.
Tipping point
What are amphibians?
Vertebrates that live part of their lives in water and part on land
Fossils tell us about the long history of life on the earth nd so far, our fossil record probably represents _____ of all species that have ever lived.
1%
What is a populations distribution of individuals among various age groups called?
Age structure
The primary reason why southern sea otter recovery is important because they _______.
Are a keystone species
Bats pry on certain species of moths by using high frequency echolocation to locate their prey. Certain moths have evolved ears that can hear these frequencies allowing them to escape. This is an example of ______.
Coevolution
What occurs when an interaction benefits one species but has little if any effect on the other?
Commensalism
Emigration is the ____.
Departure movement of individuals from a population to another area
Before conversation efforts facilitated their comeback, the American alligator population was nearly completely wiped out because of _____.
Hunters
Species that provide early warnings of damage to a community or an ecosystem are called _______.
Indicator species
The ability of a living system to survive moderate disturbances is called ______.
Inertia
What occurs when members of two or more species interact to gain access to the same limited resources?
Interspecific competition
Which of the following is another name for a non-native species?
Invasive
The loss of a(n) ______ can lead to population crashes and extinctions of other species in a community that depends on them for certain ecosystems services.
Keystone species
Too much or too little of any physical or chemical factor can prevent the growth of a population even if all other factors are at or near the optimum conditions. What is this ecological principle?
Limiting factor
Exponential growth followed by a steady decrease in population growth until the population size stabilizes is typical of _____.
Logistic growth
According to some scientists, the more diverse an ecosystem is, the ______ it will be.
More productive
Geographic isolation may result from _____.
Mountain ranges
The relationship between bacteria that live in the digestive system of animals such as humans is called ______.
Mutualism
When two species behave in ways that benefit both by providing each with food, shelter, or some other resource, it is called _______.
Mutualism
One contributing factor of the declines in many frog species is that frog eggs have...
No shells to protect the embryos from water pollutants
Which of the following would not be considered a generalist species?
Pabdas
What us said to occur when one organism feeds on another organism by living in or on the other organism?
Parasitism
A group of interbreeding individuals the same species in the same geographic region is called a(n) _____.
Population
Kelp forests help reduce _____ by blunting the force of incoming waves and trapping some of the outgoing sand.
Shore erosion
Compounds found in the ____ of certain amphibians have been isolated and used in pharmaceutical products.
Skin secretions
