Shared Flashcard Set

Details

Env. Geo. final exam
ch. 5
43
Environmental Studies
Undergraduate 1
11/03/2008

Additional Environmental Studies Flashcards

 


 

Cards

Term
Why do biomes vary in their productivity?
Definition

temperature and precipitation (they change with elevation and latitude) are very imporstant determinants

 

Landforms such as mountains, and winds also influence biomes

Term
vertical zonation
Definition
a term applied to vegetation zones defined by altitude
Term
biomes
Definition

brad types of biological communites with similar climate conditions, growth patterns, and vegetation types

 

biological productivity varies and human use of biomes depends on that factor

Term

humid tropical regions

Definition
they support one of the most complex and biologically rich biome types. All kinds of tropical forests have a lot of rainfall and uniform temperatures
Term
tropical rainforests
Definition

occur where rainfall is abundant and temps are warm to hot yr round

 

soil is thin, acidic, and nutrient-poor, but many species types

 

nutrients mostly contained in living org.s

Term
cloud forests
Definition

found in tropical forests, high in the mountains where fog and mist keep vegetation wet all the time

 

soil is thin, acidic, and nutrient-poor but many species

 

nutrients mainly found in living org.s

Term
tropical seasonal forests
Definition

These tropical regions have distinct wet and dry seasons, but temps remain hot all yr.

 

they are drought-tolerant forests

 

soils have higher nutrient levels

 

highly endangered b/c they are commonly degradaded by human habitation

Term
tropical savannas and grasslands
Definition

grasslands: too little rainfall to suppprt forests

savannas: grasslands with sparse tree cover

subject to fires b/c of lack of rain

plants have adaptations to survive drought, heat, and fire

Term
deserts
Definition

sparse vegetation (can be damaged by vehicles), but diverse

occur where pric. in uncommon

warm, dry, gigh-pressure climate conditions

plants/animals highly adapted to survive droughts, heat, and cold

Term
temperate grasslands
Definition

Occur where there is enough rain to support grass but not enough for forests

complex, diverse mix of grass and flowering plants

organic-rich soils are made from roots and dead leaves

Term
temperate shrublands
Definition

dry environments that support drought-adapted shrubs and trees, as well as grass

can be rich biologically and variable

 

Term

temperate forests

 

deciduous and coniferous

Definition

d: trees and shrubs shed their leaves at the end of their growing season

moist, moderate climates but human impacts are extensive, making most native species somewhat threatened

c: needle bearing trees, grow in a wide range of temperature and moisture conditions.

Term
temperate rainforest
Definition
the wettest coastal forests which are cool and rainy, often with a lot of fog. condensations helps
Term
boreal forests
Definition

many conifers in these northern forests

slow growing

Term
tundra
Definition

treeless landscape at high lat.s or on mountaintops with a very short growing season

not badly threatened

Term
marine ecosystems
Definition

oceans cover 3/4 of earth's surface and contribute to other ecosystems

most marine communities depend on photosynthetic plants (phytoplankton) that support the food web

Term
benthic and pelagic communities
Definition

b: at the bottom

p: at the top

Term
coral reefs
Definition

best known marine system

extraordinary biological productivity and diversity

 

they are colonies of minute animals that live symbiotically with algae

endangered community

Term
coral bleaching
Definition
the whitening of reefs due to stress leads to coral death
Term

Mangroves

Definition

salt tolerant trees that grow along warm coasts around the world.

help stabalize shorelines, provide shelter

humans have been cutting many down and they have also been destroyed/degraded

Term
estuaries
Definition
bays where rivers empty into the sea, mixiing fresh water and salt water
Term
salt marshes
Definition

shallow wetlands flooded regularly with seawater

 

biologically diverse

Term
tide pools
Definition

depressions in a rocky shoreline that are flooded at high tide. lots of wave action

prevents most plant growth

Term
lakes (freshwater)
Definition

warmer upper layer

below is a colder deeper layer

thermocliine is the sharp temperature boundary between these two

Term
conditions that affect the characteristics of an aquatic community
Definition

nutrient availabilit, suspended matter, depth, temperature, currents, bottom characteristics, currents, connections to other systems

Term
wetlands and different types
Definition

shallow ecosystems that land surface is saturated or submerged at least part of the yr

swamps are wl's with trees

marshes are wl's w/o trees

Term
streams and rivers
Definition

streams form when precipitation exceeds evaporation and water drains from the land

as streams collect water and merge they form rivers

Term
biodiversity
Definition

the variety of living things

genetic diversity: differences, genetically among species

species diversity: # of kinds organisms

ecological diversity: the complexity of a biological community

 

Term
number of species that may be alive today
Definition
3-50 million
Term
areas with high biodiversity
Definition
land by the equator and areas isolated by water, deserts, or mountains
Term
benefits of biodiversity
Definition

-many species make important contributions to human food supplies

-rare species can provide medicines

-supports stability in the ecoysystem

-nature-based ativities

-part of people's culture

Term

change to biosphere # 1 (extinction)

definition

mass extinction

premature extinction

Definition

the elimination of a species (natural process always happening)

mass extinction is abrupt rise over natural rate, there have been 5 in the past, followed by radiations

premature extinction is happening today, the only difference is that it is b/c of human action

Term

 

HIPPO

Definition

the human threats to biodiversity

habitat destruction, invasive species, pollution, population, and overharvesting

Term

habitat destruction

(loss or degredation)

Definition

biggest cause of extinction

loss: amt of habitats, forests, plowing grasslands

degredation: fragmentation which is reducing habitats into small isolated patches

creating hab. islands, surrounded by some other hab. type

Term
problems with hab. islands
Definition
some species can't survive if island is too small, can't support large pop., need more gen. diversity, not as many species
Term
minimum viable population
Definition
the number of individuals needed for long-term survival of rare and endangered species
Term
factors that affect the success and biodiversity of habitat islands
Definition
distance from colonization source, island size, extinction
Term
(bioinvasion) change # 3
Definition

introducing exotic species to habitats

if new organisms achieve "ecological release" they have nothing to control their population

this causes decrease in global biodiversity

Term

change # 2

we can increse numbers w/in species

Definition

"minion biota": increasing things we like

syanthropes: we don't try to increase, but something does well in a certain environment

Term
why save biodiversity?
Definition

nature has instrumental value: benefits humans (food, drugs, economy, cultural value "biophilia" means people have love of life)

 

nature has intrinsic value: ethical justification

Term
Endangered species act
Definition

seek to identify all endangered species and pops and to save as much biodiversity as possible

endangered: imminent dnager of ext.

threatened: likely to become endangered

vulnerable: rare or have been depeleted

Term
keystone species
Definition
major effects on ecologincal functions and whose elimination would affect many others
Term
convention of international trade in endangered species
Definition
no international trade w endangered or threatened animals
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