Ecology

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200 Terms

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an external signal that causes a response in an organism

stimulus

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A growth response of a plant toward (positive) or away from (negative) a stimulus

Tropism

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Type of tropism displayed when plants grow towards sunlight

positive phototropism

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Type of tropism displayed when plant roots grow down

Gravitropism

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Animal movement toward or away from a stimulus

taxis

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Nondirectional animal movement influenced by stimuli (ex: changes in speed)

kinesis

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5 kinds of signals by which animals communicate

visual, tactile, audible, electrical, chemical

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Natural Selection favors innate and learned behaviors that increase the chances of ? and ?

Survival, reproduction

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Behaviors that are genetically controlled and happen without prior knowledge or experience

Innate behavior

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Examples of innate behaviors

instincts, reflexes

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Behaviors that are developed as a result of experience

learned behaviors

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Behaviors are essential to animal ? and ? and subject to ?

survival, reproduction, natural selection

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The study of the ecological and evolutionary basis for animal behavior

Behavioral Ecology

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how a behavior occurs or is modified (focuses on the immediate physiological mechanisms)

proximate causation

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Environmental changes lead to hormonal changes, causing birds to migrate south. This is an example of

proximate causation

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why a behavior occurs in the context of natural selection

ultimate causation

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The fact that birds are more likely to survive in warm environments and migrate as a result is an example of

ultimate causation

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a sequence of unlearned acts directly linked to a simple stimulus

fixed action pattern

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Male stickleback fish, which have red bellies, act aggressively towards anything that is red as they automatically assume it is another male trying to take over their territory. This is an example of a

fixed action pattern

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external cue that triggers a behavior

sign stimulus

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a regular, long-distance change in location, typically occurring as a result of environmental stimuli

migration

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Examples of behavioral rhythms

circadian, circannual

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sleep-wake cycle, typically dependent on light availability

circadian rhythm

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behavioral rhythms linked to the seasonal cycle; also influenced by light availability

circannual rhythm

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stimulus transmitted from one organism to another

signal

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the transmission and reception of signals between animals

communication

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the response to one stimulus is the stimulus for the next behavior

stimulus-response chain

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chemical substances with distinct odors or tastes that certain animals emit

pheromones

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Type of study where the young of one species are placed in the care of adults from another species in the same/similar environment

cross-fostering study

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Cross-fostering studies are used to evaluate the effects of

nature vs nurture

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the modification of behavior as a result of experience

Learning

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the establishment of a long-lasting behavioral response to a particular individual or object

imprinting

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Imprinting occurs commonly in young animals and can only occur during which period of development?

sensitive period of development

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the establishment of a memory that reflects the environment's spatial structure

Spatial learning

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a representation in an animal's nervous system of spatial relationships between objects in its surroundings

Cognitive map

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the ability to associate one environmental feature with another

Associative learning

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Examples of associative learning

classical and operant conditioning

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the process of knowing that involves awareness, reasoning, recollection, and judgment

Cognition

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the cognitive activity of devising a method to proceed from one state to another in the face of real or apparent obstacles

Problem Solving

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learning through observing others

social learning

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A system of information transfer through social learning or teaching that influences the behavior of individuals in a population

culture

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food-obtaining behaviors

foraging

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natural selection should favor a foraging behavior that minimizes the costs and maximizes the benefits

optimal foraging model

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3 types of mating systems

promiscuous, monogamous, polygamous

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no strong pair bonds between mates

promiscuous

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one male mating with one female

monogamous

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an individual of one sex mating with several members of the other sex

Polygamous (polygyny - 1 male, polyandry - 1 female)

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the degree of physical difference between male and female members of a species

sexual dimorphism

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Monogamous species have (low/high) sexual dimorphism, while the polygamous species have (low/high) sexual dimorphism

low, high

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3 types of sexual selection of mates

intersexual, intrasexual, mate-choice copying

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members of one sex choose mates based on characteristics

intersexual selection

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members of one sex compete for the chance to mate

intrasexual selection

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individuals in a population copy the mate choice of others, regardless of the mate's survival advantage over others

mate-choice copying

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If a female guppy sees another female guppy with a male, she is likely to also try to mate with that male regardless of its survival advantage over other viable males. This is an example of ? which is a form of ?

mate-choice copying, social learning

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a behavior that reduces an animal's individual fitness but increases the fitness of others in the population

altruism

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Though worker bees themselves are infertile, they are specially suited to serve the queen be. This is an example of

altruism

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the total effect an individual has on proliferating its genes by producing its own offspring and by aiding relatives in order to enable them to reproduce

inclusive fitness

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Hamilton's Rule (for inclusive fitness)

rB > C (B - avg. number of extra offspring due to altruism, C - how many fewer offspring produced by the altruist, r - coefficient of relatedness)

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natural selection that favors altruism by enhancing the reproductive success of relatives

kin selection

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when an individual offers aid to a non-related individual if the recipient returns the favor in the future; rare in non-humans

reciprocal altriusm

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not returning a favor intended to be reciprocally altruistic, which can result in negative consequences

cheating

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behavior that seems purposeless

play

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playing with an object

object play

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playing by moving around (running, skipping, etc)

locomotor play

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interacting with others of the same species

social play

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believing that certain behavioral characteristics exist because they are expressions of genes that have been perpetuated by natural selection

sociobiology

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maintain homeostasis by using thermal energy from metabolic processes

endothermic (warm-blooded) organisms

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Endothermic organisms have a (direct/inverse) relationship between the size of an organism and metabolic rate

inverse (smaller organisms = higher metabolism = harder to keep warm)

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do not have the ability to regulate their body temperature

ectothermic (cold-blooded) organisms

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Cold-blooded organisms mist do what to change their body temperature?

alter their behavior

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Ectotherms are typically (larger/smaller) than endotherms

smaller

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Organisms that produce many offspring due to a constantly changing environment with scarce resources

R-selected species

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Organisms that produce fewer offspring because they are more energy-efficient and live in more stable environments

K-selected species

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links in the trophic structure

Trophic levels

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A series of steps in which organisms transfer energy by eating and being eaten

food chain

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Only 10% of the energy is transferred up trophic levels, reaching low numbers at the top predators. The rest is lost as heat

Energetic hypothesis

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Make their own organic compounds for energy through photosynthesis or chemosynthesis

Autotrophs

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Consume other organisms for their energy

Heterotrophs

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2+ food chains linked together

Food webs

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the scientific study of the interactions between organisms and the environment

Ecology

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the long-term prevailing weather conditions in a given area

climate

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fine, localized patterns of climate conditions

Microclimate

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nonliving factors that influence environment

Abiotic factors

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living factors that influence environment

Biotic factors

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a directional change to the global climate that lasts 3+ decades

Climate Change

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major life zones characterized by vegetation type or the physical environment

Biomes

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Two types of biomes

terrestrial (land) or aquatic (water)

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area of overlap between nearby biomes

Ecotone

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Top two zones of aquatic biomes

Pelagic (photic = top, aphotic = second, abyssal = bottom of aphotic)

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Lowest zone in aquatic biomes

Benthic

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Organisms that live in the benthic layer are known as ? and eat dead organic matter called ?

benthos, detritus

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layer of abrupt temperature chain that separates the upper and lower layers of most oceans and lakes

Thermocline

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semiannual mixing of waters of different temperatures in some lakes

Turnover

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the movement of individuals or gametes away from their area of origin or from areas of high population density

Dispersal

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when organisms reach an area they did not previously inhabit

Range Expansion

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the addition of a species to a new habitat

Transplant

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a group of populations of different species living in close enough proximity to interact with each other

Community

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interactions between members of different species

Interspecific interactions

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Example of interspecific interactions

Competition, predation, herbivory, parasitism, mutualism, commensalism

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a general term for any +/- interaction in which one species feeds on another

Exploitation