Biodiversity: The sum total of
all organisms in an area, taking
into account the diversity of
species, genes, populations, &
communities.
Ecosystem Diversity:
Varieties above species, i.e.
communities, habitats,
landscapes
Adaptive Radiation: the
diversification of a group
of organisms into forms
filling different ecological
niches.
Species Diversity:
number/variety of species
Species richness:
number of species
Species Evenness/Relative
Abundance: the extent to which
numbers of individuals of different
species are equal or skewed.
Genetic Diversity: the variation
in DNA composition among
individuals within a species.
Taxonomists: scientists who
classify species using an
organism's physical appearance
and genetic makeup to determine
it's specues.
Taxonomy Levels: Domain, Kingdom,
Phylum, Class, Order, Family, Genus,
Species (Do Kids Play Cards On Friday
Game Shows?)
Inbreeding Depression: when
genetically similar parents mate and
produce weak/defective offspring.
Biodiversity Distribution
Latitudinal Gradient:
Closer to equator, more
biodiversity, and vice
versa.
Generalists: Species that can
deal with a wide range of
circumstances but that do no
single thing very well
Specialists: Species that need
specific things inside their
niches to survive.
Ecotones: Where habitats intermix
Habitat Heterogeneity: Human
disturbance that causes an increase in
habitat diversity
Primary causes of population decline and species extinction
Habitat Alteration: Human interference on habitats
via farming, grazing, clear cutting forests. Most
affected - Temperate grassland
Invasive Species: The introduction of a
non-native species to new environments,
which can push native species to extinction.
Pollution: Human carelessness with
materials & chemicals has caused
habitat destruction, acidification, and
cultural eutrophocation.
Overharvesting: High
predation/hunting of a species
that leads to extinction. Particular
in K-strategists
Climate Change (global warming):
This is the manipulation of our climate
system via air pollution and ozone
depletion.
Benefits of Biodiversity
Provides food, fuel and fiber
Provides shelter &
building materials
Stabilizes Earth's
Climate
Pollinates plants,
including many crops
Controls pests
& diseases
Biodiversity provides a
variety of drugs and
medicines vital to today's
medical practices.
Tourism
Keystone Species: A
species in an
ecosystem that
holds the system
together
Ecosystem Engineers: an organism that
modifies, creates or destroys habitat and
directly or indirectly modulates the
availability of resources to other species,
causing physical state changes in biotic
or abiotic materials.
Ethical Viewpoints
Biophilia: The connections that human
beings subconsciously seek with the rest
of life
Biocentric vs.
Ecocentric
All organisms have intrinsic
value and an inherent right to
exist
Conservation Biology:
understanding the factors,
forces and processes that
influence the loss, protection,
and restoration of biodiversity.
Metapopulation (a network of
subpopulations) is created
because small pop. is most
vulnerable to extirpation, and
this is to see how species react
across subpopulations.
Endangered Species Act (ESA): Forbids
gov't and private citizens from taking
action that destroys endangered
species or their habitats.
"Shoot, shovel, shut up"
Places more value on the life of
endangered organism than on the
livelihood of a person.
Convention on International
Trade in Endangered Species
of Wild Fauna and Flora
(CITES): Protects endangered
species by banning
international transport of
their parts.
Convention on Biological
Diversity: Conserve biodiversity,
use biodiversity in sustainable
manner, and ensure fair
distribution of biodiversity's
benefits.
Umbrella vs. Flagship Species
Island Biogeography
Equilibrium Theory of Island Biogeography
Distance Effect: Farther
away from continent, less
amount of biodiversity.
Area Effect: Large islands have more
species at equilibrium than small
islands due to immigration rates and
extinction rates.
Species-Area Curves: Number of
species on an island is expected
to double as island size increases
tenfold.
Prioritize regions that are most
important globally for
biodiversity conservation (i.e.
endemic species)
Neocolonialism: Use of economical, political,
cultural, or other pressures to control/influence
other countries.
Debt-for-Nature Swap: Help pay off developing country's debt if
they promise to set aside reserves, fund environmental
education, and better manage protected areas.
Conservation Concession: Nations sell concessions to foreign
multinational corporations, allowing them to extract resources
from nation's land.