layer covering Âľ of earth; moderates temperature to keep it suitable for life
3
New cards
Herbivore
eats only plants
4
New cards
Omnivores
eat plant and animal foods
5
New cards
Detrivores
feed on detritus
6
New cards
Autotroph
producer; makes its own food; energy flow in an ecosystem begins with them
7
New cards
Energy flow
moves in one direction because it is no longer useful when converted to heat
8
New cards
Net primary productivity
amount of stored energy left in plant material and available to consumers after the plant used energy it needs for life processes
9
New cards
Trophic levels
about 10% of energy in one level is available to organisms in the next level as one moves up a food pyramid
10
New cards
Food chains
only about 5% - 20% efficient at each step which limits how many organisms can be in the chain; top carnivores will get limited energy so the higher you go, the less energy is available
11
New cards
Water cycle
involves the processes of precipitation, evaporation, transpiration, runoff, and wind
12
New cards
Greenhouse effect
sunlight enters our atmosphere, is absorbed, and reradiated back as longer wavelength heat waves which can be trapped by gases in the atmosphere
13
New cards
Ozone
O3 molecule; holes form in the ozone layer due to chlorofluorocarbons (CFCs)
14
New cards
Eutrophic
aquatic environment rich in nutrients that tends to have large populations of algae (algal blooms)
15
New cards
El Nino
leads to unusual warming in surface waters; when it fails, there is stagnation, poor fishing, and global climate pattern changes
16
New cards
Upwelling
ocean currents bring rich nutrients to the surface
17
New cards
Climate
includes temperature, topography, precipitation, and variations in solar radiation distribution
18
New cards
Flagship species
revered by humans due to their appearance
19
New cards
Conservation
supports the following ethical principles: biodiversity is desirable for the biosphere and humans; biodiversity has value in and of itself regardless of any practical human benefits; complex interactions of ecosystems support biodiversity and are desirable; extinctions due to human actions are undesirable
20
New cards
Biological diversity
how many different species exist in the biosphere; many species that are in danger of extinction have not been studied, and some may contain potentially useful characteristics for domestication and use; 10% to 20% of all species now living may become extinct in the next twenty to fifty years; examples: a 4-square-mile area of rain forest holds more tree species than are found across the continental United States; migratory birds often depend on the diverse habitats on several continents
21
New cards
Biodiversity hotspot
contains a high concentration of unique species
22
New cards
Biodiversity frontier
contains many more species that previously thought
23
New cards
Extinction
the last remaining individual of a species dies out; there are a variety of causes to extinctions and an animal or plant may go extinct due to different combinations of factors
24
New cards
Exotic species
introduced species which can become invasive; occurs when new settlers arrive in an area; it can be accidentally or intentionally introduced and can occur through agricultural and horticultural activities
25
New cards
Acid rain
occurs when exhaust from cars and factories combines with water in the atmosphere to produce a weak acid
26
New cards
Global warming
having a serious impact on coral reefs since a small temperature increase can cause them to expel algae and turn white (coral bleaching) which means they stop growing and reproducing
27
New cards
Overfishing
many areas have been overexploited leading to drastic decreases in fish populations
28
New cards
Metapopulation
formed when habitats are fragmented; populations are subdivided into several small and isolated groups to form the metapopulation
29
New cards
Keystone species
critical species for an ecosystem; if they are removed the ecosystem can collapse
30
New cards
Source population
a species lives in favorable conditions where its birthrate exceeds its death rate so it can provide input to other fragmented populations
31
New cards
Sink population
a species survives in unfavorable conditions where its death rate exceeds its birthrate so it must have input from other fragmented populations
32
New cards
Edge effect
patches get smaller and organisms live well deep inside large patches and are exposed to less favorable conditions
33
New cards
Population viability analysis
calculates the minimum number of individuals needed to keep a population thriving
34
New cards
Habitat restoration plan
researchers identify the factors causing habitat decline and develop a procedure to fix them
35
New cards
Human overpopulation
a primary challenge of conservation because we use too many resources, produce too much waste, and damage the environment