1 BIODIVERSITY I. Biodiversity a. Defined b. Measuring biodiversity c. Taxonomy (naming things) d. New species continue to be discovered II. Biodiversity in the US III Gradients in Biodiversity a. Space b. Time: Succession c. Human Impacts on Biodiversity BIODIVERSITY: The variety of organisms considered at all levels: from genetic variants belonging to the same species through arrays of species, to arrays of genera, families and still higher taxonomic levels. E. O. Wilson (1992) We have to consider diversity at different levels. Biomes Ecosystems Communities Population Species (Subspecies, Variation) SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman For the exclusive use of students in GEOG 316 Fall 06 SFSU
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BIODIVERSITYI. Biodiversity
a. Defined b. Measuring biodiversity
c. Taxonomy (naming things)d. New species continue to be discovered
II. Biodiversity in the USIII Gradients in Biodiversity
a. Spaceb. Time: Successionc. Human Impacts on Biodiversity
BIODIVERSITY:The variety of organisms considered at all levels: from genetic variants belonging to the same species through arrays of species, to arrays of genera, families and still higher taxonomic levels. E. O. Wilson (1992)
We have to consider diversity at different levels.
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
2
BiomesBiomes :: broad major groupings of natural broad major groupings of natural ecosystems that include animals as well as ecosystems that include animals as well as plant life. plant life.
Ecosystem: grouping of plants, animals and microbes, etc. interacting with each other and their physical environment "ECO" = "oikos" (greek for home)
Community: all plants and animals inhabiting an area (suggests interactions)
Population: a group of individuals of the same species in an area
Species: a group of organisms where all members do or have the potential to interbreed and produce viable offspring.Subspecies: Anatomically different but still able to interbreed
Morphological Species Concept: each species is morphologically distinguishable from its closest relative.
Biological Species Concept: a group of organisms that is reproductively isolatedfrom another group
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Red wolf (Canis rufus)
Taxonomy
(naming things)
Major Groups :
Prokaryotes,DNA not enclosed in a nucleusDNA not enclosed in a nucleus(includes (includes moneramonera, viruses), viruses)
EukaryotesDNA enclosed in a nucleus DNA enclosed in a nucleus includes fungi, includes fungi, protistaprotista, animals, plants), animals, plants)
Until recently: 5 kingdomsUntil recently: 5 kingdoms
MoneraMonera (Bacteria and Blue green algae)(Bacteria and Blue green algae)
New Species. About 10,000 new species are found every year, and most of these are insects and other inconspicuous animals
For animals: New species are still being discovered, at the rate of about 1-5 birds and 1-5 mammalsper year
Primates: 38 primates, species and subspecies, have been described in the last ten years: 10 from Madagascar, 8 from Africa, 7 from South-east Asia, 10 from the Brazilian Amazon (seven of them marmosets), and 3 from the Brazilian Atlantic forest.
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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BLACKBLACK--FACED LION FACED LION TAMARINTAMARIN
((LeontopithecusLeontopithecus caissaracaissara))
Known locally as:Known locally as:micomico--leãoleão--caracara--pretapreta
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Head of the Megamouthstranded at Mandurah, Western Australia.
Fishermen captured the shark six kilometers from their home in BarangayPuerto. Map is cropped from Encarta World Atlas 1998 Edition.
The Antarctic brainbeardplunderfish (Pogonophrynecerebropogon), a new species recently collected at a depth of 300 m in the Ross Sea. The long chin barbel is used as a lure to attract prey. This species is nearly 15 inches long.
The Antarctic gravelbeardplunderfish (Artedidracoglareobarbatus), collected at a depth of 130 m near Franklin Island in the Ross Sea. This species lives in the vicinity of sponge beds and uses its chin barbel as a lure to attract prey. This species is about 6 inches long.
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
Cataloging the biodiversity on Cataloging the biodiversity on Earth is a huge team effort.Earth is a huge team effort.The Tree of LifeThe Tree of LifeAllAll--species Foundationspecies FoundationAllAll--species Inventoryspecies Inventory
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Biodiversity in the United StatesBiodiversity in the United States
200,000 native200,000 nativespecies currentlyspecies currentlyknown in the USknown in the US
DevilDevil’’s hole pupfishs hole pupfish
Coast Redwood
US BiodiversityUS BiodiversityFour out of every 10Four out of every 10salamanders are found in USsalamanders are found in US
Freshwater speciesFreshwater species1/3 of world1/3 of world’’s freshwater musselss freshwater mussels61% of worlds freshwater crayfish61% of worlds freshwater crayfish22% of freshwater turtles22% of freshwater turtles17% of freshwater snails17% of freshwater snails
US biodiversityUS biodiversitySixth greatest diversity Sixth greatest diversity
of mammalsof mammals
Second in number Second in number of gymnospermsof gymnosperms
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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CaliforniaCalifornia
California is most California is most biologically biologically diverse state in diverse state in the unionthe union40,000+ species 40,000+ species Most federally Most federally listed specieslisted species
Biodiversity Biodiversity through through spacespace
Biodiversity through Biodiversity through spacespace
As you go away from the tropics As you go away from the tropics species numbers decreasespecies numbers decrease
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Profile of a tropical rainforest . Different heights allows different niches. TRF can accommodate more species
Relationship between the number of birds species and the number of canopy layers.
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Number of breeding birds in different parts of Central and North America
Number of mammal species in Central and North America
Number of tree species found in parts of North America
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Diversity Diversity through timethrough time
Diversity through timeDiversity through time
Succession:Succession:Change in Change in species species composition composition over time over time ((thought to be thought to be directional and directional and predictable)predictable)
Primary Primary SuccessionSuccession: : succession of plant succession of plant communities of communities of new land/soilnew land/soil
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Secondary successionSecondary succession: previously : previously vegetated land that has been recently vegetated land that has been recently disturbed (disturbed (seed source in soilseed source in soil) ) agricultural agricultural field, clear cutfield, clear cut
Disturbance successionDisturbance succession: where : where disturbance creates/initiates the disturbance creates/initiates the successional process: successional process: fire, floodfire, flood
SeresSeres:: series series of communities of communities that follow one that follow one another:another:early seral stageearly seral stagemid seral stagemid seral stagelate seral stagelate seral stage
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Early seral stageEarly seral stagePioneer species: (Pioneer species: (plants plants adapted to adverse adapted to adverse conditions) conditions) weedy, weedy, germinate/grow quickgerminate/grow quicklots of seedslots of seeds
Late seral stage (Mature Late seral stage (Mature stage)stage)stress stress tolerators,longtolerators,long livedlived–– Climax CommunityClimax Community: : community in community in
““equilibrium stateequilibrium state”” stable but not staticstable but not static
regenerates/ individuals replaced by regenerates/ individuals replaced by same speciessame species
FacilitationFacilitation: Species create : Species create favorable environment for new favorable environment for new speciesspecies
IndividualisticIndividualistic: Random : Random occurrence of species , they occurrence of species , they happen to be able to survivehappen to be able to survive
Successional Theories
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Time
Small herbsand shrubs
Heath mat
Jack pine,black spruce,and aspen
Balsam fir,paper birch, andwhite spruceclimax community
Exposedrocks
Lichensand mosses
Time
Annualweeds
Perennialweeds and grasses
ShrubsYoung pine forest
Mature oak-hickory forest
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Seedling cover increased significantly the second year
The largest seedling observed in 1997 was 1.4 m
By year 2000 saplings are well-established averaging 2.5-3m
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
22
Density 1996 1997 2001
Area Total Seedlings Avg/m2 Total Seedlings Avg/m2 Total Saplings Avg/m2 p
Characteristics of early and late Successional Stages
EARLY LATE Net Biomass (annual) high low Mineral Cycling open closed Nutrient Exchange Rate rapid slow Number of Species low -highest- high Food Chains linear web like
(simple) (complex)
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
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Mature: Old Growth
Human effects on Human effects on SuccessionSuccession
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU
25
Wrap upI. Biodiversity
a. Defined at all taxonomic levels b. Measuring biodiversity
From Biomes to individualsSpatial and relational differences
c. Taxonomy (naming things)A way to organize life on the planet3 domains, 5 kingdoms, KPCOFGS
d. New species continue to be discovered (recorded)Primates as well as invertebrates and beyond
II. Biodiversity in the USIII Gradients in Biodiversity
a. As you go up in latitude you go down in biodiversiyb. Time: Successionc. Human Impacts on Biodiversity
SFSU Geography 316-Fall 2006 Dr. Barbara A. Holzman
For the exclusive use of students in GEOG 316 Fall 06 SFSU