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Geography 2
Post midterm
64
Geography
Undergraduate 2
02/23/2011

Additional Geography Flashcards

 


 

Cards

Term
Define range
Definition
-Area over which a species is found
-Defined by maps: Dot(locations out in space where species are found; GPS), and choropleth(fills in dotted range)
-An abstraction, fills areas not always occupied.
-also determined by a scale.
Term
Range size determination; Large vs. small
Definition
-Smaller more common than large.Suggests perhaps that there are fewer generalists than specialists(Smaller ranges)
-Large range species more common on local leve, small range have low densities on local level.
Term
What are pandemic species?
Definition
Species found over a large range area.
Term
Why are ranges more elliptical or rectangular than circular and square?
Definition
-temperature, water source, geographic features.
Term
Why do predators have larger ranges than herbivores?
Definition
-less energy at higher trophic levels, physically larger.
Term
Why are ranges for species at high elevation larger?
Definition
-less food resources RAPOPORT'S RULE(look up)
Term
What are the different distributions based on latitudes?
Definition
-circumpolar(caribou), boreal(fur), temperate(sugar maple), tropical(spotted dolphin)
Term
What is disjunct dispersal(distribution)
Definition
-Jump dispersal main cause
-not unified
-Climate disjunctions: changes in climate separates populations, i.e. climate cooling and drying during Ice Age(Magnolia found in E. America/S.E China), alligators in America and china,
Gorillas- Rwanda & congo republic, used to be more widespread, pinched off in middle through cooling, reducing rainforests.
Term
allopatric speciation
Definition
-separate populations over time may evolve distinctly different characteristics. If the geographical barriers are later removed, members of the two populations may be unable to successfully mate with each other, at which point, the genetically isolated groups have emerged as different species
Term
What are geological disjunctions?
Definition
-Tectonic activity causing disjunction.
Term
What are Biogeographic Relicts, how do they occur, what are glacial relicts?
Definition
-species that had large range but have shrunk to narrow endemics.
-"Paleoendemics"
-become relicts due to narrowed range from climate change
-Glacial relicts: monterey pines/torrey pines, used to be widely dispersed along CA, likes cool climate/water, global warming (past 10,000yrs) has minimized sites.
-survive due to cool summer fog.
Term
What are evolutionary relicts?
Definition
-survivors of formerly more widespread and diverse evolutionary lineages.
-ginko tree, cycades, magnolia
-SOME Relicts can be both evolutionary & climatic- Ca Coastal Redwood, Dawn Redwood(china)"living fossil"
Term
How many species are identified on earth?
Definition
1.7 million, MANY more unidentified
-majority are insects, then plants, vertabretes are very small(2.7%)
-
Term
what is species richness?
Definition
-Biodiversity but doesn't describe species evenness or rarity.
-Area & species richness correlation- biodiversity increases with areas, biggest at ends(small gains and end gains)
-# of species per area not just total, more about density.
Term
What are Global "Hot Spots", what are some in US?
Definition
-areas of high species richness/diversity
-amazon, andes, tropical rainforest, SE Asia
-Lots of mountains, niches
-In USA: Appalachian: altitudinal diversity, meeting place of southern/northern type trees, HIGHEST PLANT DIVERSITY IN US
California: Highest animal diversity
Term
Name some patterns in geographical patterns of Biodiversity.
Definition
-Global scale pattern: plant biodiversity greatest in tropics/low latitudes due to "Primary productivity"- high sunlight/rain
-Perhaps disturbance @ high latitudes- Ice ages, primary productivity is main theory.
Term
Factors that increase biodiversity
Definition
-Physically diverse habitat with many niches,(rainforest canopies)
-Altitudinal diversity
-Resource rich environments: rich soils, water, etc.
-High diversity at 1 trophic level can stimulate high diversity in another. E.g. grasses that allow for different types of foods, specialization, etc.
-Moderate amount of disturbances- fire ecology
Term
factors that reduce biodiversity
Definition
-extreme environments: polar, cold
-limitation of crucial resource: deserts, lack water
-environmental stress
-habitat fragmentation
-extreme amounts of disturbances
-introduction to exotic species.
Term
what are the effects of habitat fragmentation?
Definition
-edge effect: boundary of 2 habitats, ecotones, can completely consume fragmented habitats that are small enough
Term
Why conserve biodiversity?
Definition
Multiple perspectives of nature; different views and reasons
Term
What are direct utilitarian values of CONSERVING biodiversity?
Definition
i.e. food, protecting wild grain species, or awaiting for new grain specie to survive.
-Utilitarian: food, protecting grain varieties
-Religion/Spiritual values
-Medicine and other compounds: Aspirin, taxol from canadian yew tree.
-Medical research: animals-tested, armadillo leprosy research.
-Aesthetic Values: enhance quality of life through beauty, like eco-tourism.
-Many indigenous peoples rely on local biodiversity for food, medicine, etc.
Term
What are indirect utilitarian values
Definition
-Ecological service values: i.e. pollinators
-Ethical values(Bio-centrism): other species have moral right to exist independent of our need for them; we are global stewards.
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-Evolutionary processes: more biodiversity more genetic material, healthier “raw material” for evolution.
Term
Whats wrong with public policy on biodiversity?
Definition
Over focus on aesthetic landscapes instead of biodiversity landscape.
-dramatic landscapes of W. USA get preserved BUT East/South are much more biologically diverse.
-ACCEPTIONS: Everglades;( saved for high biodiversity), Charismatic Mega-fauna get attention/funding(What about the bacteria!?)
Term
What is species-Based conservation? 2 kinds!
Definition
Directed toward one species; endangered species act!
-In situ conservation: focus on natural habitat of species, i.e. Northern Spotted owl sensitive to habitat
-Ex situ conservation: out of it's environment, lab/cage/zoo maintain #s
Term
What is Habitat-based conservation?
Definition
-hard to preserve one species alone so protect habitats instead, letting natural processes work.
-Nature conservancy buys up a lot of land for this.
Term
What is environmental restoration?
Definition
-Go back and undo damage from humans, recreate habitats.
-LA river is in terrible condition, trying to revise
Term
What is the traditional theory of island biogeography?
-species richness?
-Species turnover?(Another card)
Definition
-Author: MacArthur & Wilson
-Species richness coorelated w/ island size. Bigger island-->Bigger species richness; Also applied to lakes, mtns.
-Island proximity to mainland affects species richness. Closer=richer.
-assumption: species richness tend towards equilibrium AND rate of immigration - extinction.
-Rate of extinction determined by size of island: large=low, small=high.
-Rate of immigration determined by proximity to mainland: far= low, near=high.
Term
What is species turnover?
Definition
Change in species composition not richness.
-Large island/far(low extinction few migrants)= low turnover, small/near=high
Term
Examples that support traditional theory of island biogeography
Definition
-Krakatau island: formed in 1883 by volcano, in 1935 tropical forest established
Term
Explain Alfred Wenegers theory
Definition
-Plate tectonics: Original theory is based off:
-fossil evidence
-shape of continents
-continents made of granite/ocean made of basalt.
-sub-tropic areas with signs of glaciation
-greenland moving west
Term
What did Pangea split in 2?
Definition
-Laurasia: N. America, Europe, Asia
Gondwanaland: S. Asia, S. America, India, Australia, Antarctica
Term
What is the newly discovered evidence of plate tectonics?
Definition
-More fossil evidence
-explains modern distribution of plants/animals.
-sonar/mapping sea floor found Mid-Oceanic Ridge.
-Age of Oceanic Crust(youg near ridge)
-Orientation of rock crystals(when cool, orient to magnetic fields)
Term
When was the last ice age?
Definition
Pleistocene era
-3 ice sheets: laurentide, Greenland, Scandonavian
-Climate changes lead to sea level changes
Term
Why do ice ages occur?
Definition
-Changes in orbit of earth relative to sun
-Milakovitch orbital theory of glaciations: There are warming/cooling periods, orbit around sun not constant.
-ECCENTRICITY: Orbits from cicular to oval.
-APHELION: Earth farthest from sun
-Obliquity: Axial tilt change, more tilt=more seasonality.
-Human induced climate change.
Term
What is Orbital "eccentricity", "Aphelion", and "Obliquity"?
Definition
-Eccentricity: orbit goes from circular to oval determining timing of Aphelion- moment earth is farthest from sun
-obliquity: Axial tilt change: more tilt=more seasonality.
Term
Animals most likely to go extinct first
Definition
-Complex: less likely to survive condition changes
-Large: more resources
-small population: local changes can wipe out entire population.
-Top of food chain: depend on prey
-specialists w/ narrow niche- can't handle environmental change.
-slow rebirth
-Small range
-Low dispersal: cant shift to new location after environmental change.
Term
What degines a biogeographic region/line?
Definition
-Region w/ genetic similarity of life
-Biogeographic lines: boundaries between regions, blurry, transition zones?
-Higher the taxonomic order= higher the biogeographic similarities(cosmopolitan= found in more than one place)
Term
Simpson indec
Definition
estimates of similarities between different regions.
Term
Highlights of nearctic & paleartic region
Definition
-many animals/plants shared
-HIGH DIVERSITY OF FLOWERING PLANTS
-Pleistocene extinction
Term
Highlights of neotropic region
Definition
-3 marsupials
-MOST DIVERSE FLOWERING PLANTS! 137, 50 families.
-many shared w/ Africa/Australia
Term
African Region
Definition
-MOST DIVERSE MAMMAL POPULATION
-Share lots of mammals w/ palearctic/oriental
-Share lots of plants with neotropic/australian but not animals
Term
Oriental region
Definition
-endemic mammals: orangutans
-share plants w/ australia no animals.
Term
Australian region
Definition
-most diverse, dominated by marsupials
-similar flowering plants to africa/neotropic
Term
5 cases for plate tectonics/dispersal
Definition
-Angiosperm
-Marsupials/placentals
-Holarctic Region
-Panama Isthmus & Great America Exchnage
-Wallace's Line
Term
Angiosperm case for biogeographic regions
Definition
-Appear late jurssaic age, former laurasia/gondwanaland continents share similar species.
Term
Marsupial & Placental case for bio-geographic regions
Definition
-meteor killed dinosaurs, allowed for new species to rise
-Marsupials evolved first in N. America, then disperse.
-Mammals evolve and out compete but never make it to Australia before ecut off.
Term
Holarctice region case for biographic regions
Definition
-Holarctic= Neoarctic & Palearctic
-Very similar regions
-Land bridge(beringia) connected during ice age.
-similar latitudes-easier to migrate.
Term
Panama Isthmus/Great American Exchange cae for bio geographical regions.
Definition
-climate changed opened passage but made it tropical
-"filtered" tropics made it hard to pass, create n.america/s.america difference.
-Always harder traveling N/S
Term
Where did zacheys bro do his research? What was his job? What are fish weirs?
Definition
-Where:Tulilip Washington
-Job: protect treaty resources for future generations
-Fish weirs: enormous salmon suns allowed indians to be stationary
Term
What did the Tulilip treaty decide?
Definition
-Tribes have right to 1/2 fish
-Tribes have say in environmental management
-Tribes have right to 1/2 shellfish
Term
What caused salmon #s to decline
Definition
-overfishing
-dams:block upstream migration/caught in turbines coming downstream, the fish ladders allow for seals to predate.
-loss of habitat: ubranization/agriculutre/channelization runoffs
-hatcheries: release juvenile, genetic changes, disease
Term
How to recover salmon?
Definition
-set goals: what were they before, how do we get there.
-Harvest:better fishing management, more hatcheries.
-Dams: fish ladders, removal, mitigation
-habitat: recovery/research
-PROBLEM: Population growth/develoment, politics, encforcement, pollution.
Term
Why conserve biodiversity?
Definition
-Utilizing for people
-spiritual beliefs
-Ecological services
-Moral right
-Preserve genetic material, seeds, for more evolution into future.
Term
Who came up with theory of biogeography and what are the main points?
Definition
-Macarthur & Wilson
-Size of island, proximity to mainland important for diversity
-not just for islands also mountains, forest fragments, pools, reserves.
Term
What is species turnover? What is best setting?
Definition
-change in species composition not richness, best in middle away islands.
Term
Rescue effect
Definition
close islands= less turnover rae because members of same species can migrat to save a struggling population.
Term
LARGE RESERVE BETTER THAN SMALL BECAUSE...
Definition
-higher species richness
-less edge effect
-lower extinction
-target effect
Term
-Several small bad because
Definition
-increase edge effect
-increase extinction
-isolation populations from one another, decrease rescue effect. unless they are in close proximity.
Term
corridors between reserves good
Definition
-facilitate rescue effect
-connect populations.
Term
wallaces line
Definition
-Biogeographic line separates indonesia from australia, sea level never declined far enough for species to cross over to australia.
Term
-2 types of relict species
Definition
-Climatic: change of climate killed off most but a few left over, torrey/ monterey pine
-Evolutionary: geinko tree all thats left, smell like dog poo.
Term
argument for several small nature reserves
Definition
-climate can change, natural disasters occur, need to divy up odds so they arent all wiped out at once.
-Species/area relationship non-linear , rises immediately with area then steadies out.
-habitat diversity, more different unique regions.
Term
What regions are similar?
Definition
-S.America/Australia share angiosperm from when they were part of gondwanaland.
Term
Small island effect.
Definition
-little difference in species richness among small islands.
minimum viable population size [MVPS]: # of individuals required for high probability of survival -> small islands at disadvantage
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