APES Unit 3: Animals Flashcards
Density Independent (DI)
affects a population regardless of it’s density
density independent factors
human activity, natural disasters, temperature, sunlight, physical charcatersitics
Density Dependent (DD)
only affects a population once it reaches a certain size
density Dependent factors
stress, behavior, predation, parasitism, competition
primary productivity
rate that solar energy is converted into organic compounds via photosynthesis over a unit of time
NPP Equation
NPP=GPP-RL
Net Primary Productivity (NPP)
amount of energy (biomass) leftover for consumers after plants have used some for respiration
Respiration Loss (RL)
plants use some of the energy they generate via photosynthesis by doing cell respiration
Gross Primary Productivity (GPP)
the total amount of sun energy (light) that plants capture and convert to energy (glucose) through photosynthesis
Ecological Efficiency
the portion of incoming solar energy that is captured by plants and converted into biomass (NPP or food available for consumers)
First Law of Thermodynamics
Energy can’t be created or destroyed, it just changes form
Second law of Thermodynamics
Energy transfers from useful to less useful forms. It cannot be recycled or reused. As energy transfers, heat is lost. Energy is becoming less useful over time.
producers
plants produce - convert sun’s light energy into chemical energy (glucose)
primary consumers
animals that eat plants (herbivores)
secondary consumers
animals that eat primary consumers or herbivores (aka - carnivores and omnivores)
tertiary consumers
animals that eat secondary consumers or carnivores and omnivores (aka - top/apex predators)
Trophic Cascade
removal or addition of a top predator has a ripple effect down through lower trophic levels
Genetic Drift
change allele frequency in a population that are random unlike natural selection, and won by chance
Bottleneck Effect
natural disaster results in some surviving organisms - not better adapted - now they don’t represent the original population
founder effect
organisms that arrive to start a new population on an island - don’t necessarily represent the original population
Bottleneck Event
an environmental disturbance that drastically reduces population size and kills organisms regardless of their genome
Natural selection
driving force of evolutionary adaptations (mechanism)
Adaptations
physical or behavioral traits that make an organism better suited to its environment (characteristic)
specialist
species with a narrow ecological niche - can only survive in a specific environment
generalist
species with a broad ecological niche - able to live and eat in multiple environments
Ecological range of tolerance
range of conditions such as temperature, salinity, pH, or sunlight that an organism can endure before injury or death results
example of range of tolerance
salmon have a basic range of tolerance for temperature from 6 to 22 degrees, some individual salmon have adaptations that give them a range of tolerance that is outside the basic range for the species
optimal range
range where organisms survive, grow, and reproduce
zone of physiological stress
range where organisms survive, but experience some stress such as infertility, lack of growth, decreased activity
Zone of intolerance
range where the organism will die
example of zone of intolerance
thermal shock, suffocation, lack of food/water/oxygen
Counteracting behaviors
bats use echolocation/listen for returning signal
Defensive coloration
warning coloration - stinging insects