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Why do biomes vary in their productivity? |
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Definition
temperature and precipitation (they change with elevation and latitude) are very imporstant determinants Landforms such as mountains, and winds also influence biomes |
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a term applied to vegetation zones defined by altitude |
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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 |
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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 |
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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 |
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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 |
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tropical seasonal forests |
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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 |
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tropical savannas and grasslands |
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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 |
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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 |
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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 |
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dry environments that support drought-adapted shrubs and trees, as well as grass can be rich biologically and variable |
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temperate forests deciduous and coniferous |
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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. |
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the wettest coastal forests which are cool and rainy, often with a lot of fog. condensations helps |
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many conifers in these northern forests slow growing |
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treeless landscape at high lat.s or on mountaintops with a very short growing season not badly threatened |
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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 |
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benthic and pelagic communities |
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Definition
b: at the bottom p: at the top |
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best known marine system extraordinary biological productivity and diversity they are colonies of minute animals that live symbiotically with algae endangered community |
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the whitening of reefs due to stress leads to coral death |
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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 |
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bays where rivers empty into the sea, mixiing fresh water and salt water |
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shallow wetlands flooded regularly with seawater biologically diverse |
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depressions in a rocky shoreline that are flooded at high tide. lots of wave action prevents most plant growth |
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warmer upper layer below is a colder deeper layer thermocliine is the sharp temperature boundary between these two |
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conditions that affect the characteristics of an aquatic community |
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Definition
nutrient availabilit, suspended matter, depth, temperature, currents, bottom characteristics, currents, connections to other systems |
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wetlands and different types |
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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 |
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streams form when precipitation exceeds evaporation and water drains from the land as streams collect water and merge they form rivers |
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the variety of living things genetic diversity: differences, genetically among species species diversity: # of kinds organisms ecological diversity: the complexity of a biological community |
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number of species that may be alive today |
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areas with high biodiversity |
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land by the equator and areas isolated by water, deserts, or mountains |
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-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 |
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change to biosphere # 1 (extinction) definition mass extinction premature extinction |
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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 |
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the human threats to biodiversity habitat destruction, invasive species, pollution, population, and overharvesting |
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habitat destruction (loss or degredation) |
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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 |
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problems with hab. islands |
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Definition
some species can't survive if island is too small, can't support large pop., need more gen. diversity, not as many species |
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minimum viable population |
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Definition
the number of individuals needed for long-term survival of rare and endangered species |
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factors that affect the success and biodiversity of habitat islands |
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Definition
distance from colonization source, island size, extinction |
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introducing exotic species to habitats if new organisms achieve "ecological release" they have nothing to control their population this causes decrease in global biodiversity |
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change # 2 we can increse numbers w/in species |
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"minion biota": increasing things we like syanthropes: we don't try to increase, but something does well in a certain environment |
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nature has instrumental value: benefits humans (food, drugs, economy, cultural value "biophilia" means people have love of life) nature has intrinsic value: ethical justification |
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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 |
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major effects on ecologincal functions and whose elimination would affect many others |
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convention of international trade in endangered species |
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Definition
no international trade w endangered or threatened animals |
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