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exam 2

Exponential growth involves continuous change

dn/dt=rn

Doubling times and the rule of 70

a rule that can be used to determine how long it will take for a given population to double given its growth rate.

Exponential growth leads to crashes

A population can grow at an exponential rate very fast only if nothing limits its growth,

Logistic growth slows with population increase

growth rates slow down as the population approaches carrying capacity due to resources becoming scarce

How to predict sustainable yield

the carrying capacity divided by 2

Species respond to limits differently

r-selected species rely upon a high reproductive rate to overcome the high mortality of offspring with little or no parental care.
K-selected species have few offspring, slower growth as they near carrying capacity and exercise more parental care.

Survivorship curves show life histories

a graph of the number of individuals surviving at each age interval versus time

Intrinsic and extrinsic factors affect births and deaths

Intrinsic factors - operate within or between individual organisms in the same species.
Extrinsic factors - imposed from outside the population.

Interspecific interactions are between species

Organisms of two species use the same limited resource and have a negative impact on each other.

Stress and crowding can affect reproduction

their fertility rates decrease

Density-depend on effects can be dramatic

can influence a population including: disease, physiological stress and predation.

Genetic diversity may help a population survive

species to adapt to future environmental changes and avoid inbreedin

Evolution occurs through reproduction, variation, and natural selection

Evolution occurs through reproduction, variation, and natural selection

All species live within limits

All species live within limits

Resource partitioning can reduce competition

Resource partitioning can reduce competition

Community dynamics involves diversity, abundance, and distribution of species.

Community dynamics involves diversity, abundance, and distribution of species.

Biological communities vary in productivity

Biological communities vary in productivity

Biological communities may be adapted to disturbance

Biological communities may be adapted to disturbance

Community dynamics involves

diversity, abundance, and distribution of species

Ecological indicators

Complexity and connectedness.

Biological communities vary in productivity

Biological communities vary in productivity

Can development be sustainable?

economic growth, social inclusion and environmental protection.

Recourses, renewable or nonrenewable.

Recourses, renewable or nonrenewable.

Tropical moist forest

Humid regions in the tropics

Tropical seasonal forest

wet and dry seasons with hot temperatures year round

Tropical savannas and grasslands

Grasslands are lands with plants
Savannas are grasslands with scattered trees

Deserts

low moisture levels

Temperate grasslands

Communities of grasses and seasonal herbaceous flowering plants.

Temperate Shrubland

by warm, dry summers and cool, moist winters

Temperate Deciduous Forests . Coniferous Forest

Deciduous trees lose their leaves in winter as an adaptation to freezing temperatures.

Boreal forest

a conifer or conifer-hardwood forest type occurring on moist to dry sites characterized

Tundra

treeless landscape that occurs at high latitudes or on mountaintops.

What is biodiversity?

the variety and variability of life on Earth

Species are defined in different ways

Reproductive isolation, Phylogenetic species concept, Evolutionary species concept

Molecular techniques in taxonomy

•Genome - total D N A sequence that characterizes a species.
•Species classification or even identification of an individual can be done from samples such as blood, fur, or feces.

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