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NREM 120 EXAM 4 | Questions And Answers Latest {} A+ Graded | 100% Verified
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NREM 120 EXAM 4 | Questions And Answers Latest {} A+ Graded | 100% Verified
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NREM 120 EXAM 4 | Questions And Answers Latest {2024- 2025} A+ Graded | 100%Verified
Solutions to preserve species (3) - 1. Species approach, 2. Zoo-botanical garden approach, 3. Ecosystem
approach
Species Approach - reintroducing an animal/plant into the wild, protecting their habitat
Zoo/Botanical Garden Approach - goal is to re-release into the wild, captive breeding to get numbers
back up, THIS IS LAST RESORT OPTION
Ecosystem Approach - instead of singling out a specific species, focusing on preserving the whole system
Removal of what species shakes up the entire food web? - Keystone species
keystone species - A species that influences the survival of many other species in an ecosystem (Gopher
Tortoise)
Causes of extinction - -loss of habitat
-hunting
-toxic chemicals
-vulnerable traits
-invasive species
Invasive species are the ____ biggest contributor of species decline in the US - second (after habitat loss)
Nonindigenous - an organism that has been introduced to an area to which it is not native; exotic or
non-native.
invasive species - exotic species that pose a threat to the integrity of native ecosystems
, endemic - native to a specific place and found nowhere else
Hessian fly from Christopher Columbus - brought over in 1400s and was a huge crop pest of wheat
How did invasive species arrive in North America? - By accident and on purpose
House sparrows - introduced to North America in 1850s to control linden month, they ended up
disastrous because they out-competed native species and ate everything
Starlings - introduced into NY park (about 70 birds) and over 50 years they multiplied to over 200 million
Accidental introduction - "hitch hikers" with commercial transport, pests brought in with foreign
products, disease organisms
Zebra mussels - accidentally introduced to Great Lakes; clogs water-intake pipes and irrigation pipes
Why are invasives a problem? - -economic costs to agriculture
-crowd out native species
-disrupt ecosystem functions
more than 4,500 species have been introduced to the US, how many have ESTABLISHED? - about 450,
with 59 expected to cause economic or environmental damage
Pest control costs are nearing - $100 billion
What type of land mass is the most vulnerable? - islands
Brown tree snake in Guam - -shortly after WWII
-slowly spread
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