Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
30 Cards in this Set
- Front
- Back
|
What is the most common cause for the extinction of most species?
|
*human actions
|
|
|
What does the term biodiversity or biological diversity refer to?
|
*usually refers to the number of different species in a given area.
|
|
|
About how many species have been identified and named?
|
*1.7 million, which most are insects.
|
|
|
What determines whether a species is known or unknown?
|
*New species are considered "known" when they are collected and described scientifically.
*"unknown" species exist in remote wildernessess, deep in the ocean and in cities. |
|
|
List the 3 level of biodiversity.
|
1. Species diversity
2. Ecosystem diversity 3. Genetic diversity |
|
|
Species diversity
|
*refers to the number of different species in an area.
|
|
|
Ecosystem diversity
|
*refers to the variety of habitats, communications and ecological processes with and between ecosystems.
|
|
|
Genetic diversity
|
*refers to all the different genes contained within all members of a population.
|
|
|
Describe different way that species are connected to the ecosystem?
|
*we depend on healthy ecosystems to ensure a health biospere that has balanced cycles of energy and nutrients.
*every speciesis probably either dependent or depended upon at least one other species in ways that are not obvious. |
|
|
Keystone species
|
*some species are so clearly critical to the functioning of an ecosystem.
example: is a sea otter population led to the loss of the kep beds along the U.S. Pacific coast and how the recovery of otter populations led to the recovery of the kelp populations. |
|
|
Why are small and isolated populations at risk for survival?
|
*when a population is small it is less likely to survive changes. The genetic diversity decreases.
|
|
|
What percentage of pharmaceutical drugs used in the US is derived from plants?
|
*aproximately 1/4
|
|
|
Where do most of the active chemical ingredients found in antibiotics come from?
|
*almost all antibiotics are derived from chemicals found in fungi.
|
|
|
How do humans benefit from biodiversity every time they eat?
|
*most new crop varieties are hybrid crop populations.
|
|
|
What is ecotourism and how does it affect people?
|
*a form of tourism that supports the conservation and sustainable development of ecologically unique areas.
|
|
|
Endangered Species
|
*a species that is likely to become extinct if protective measures are not taken immediately.
|
|
|
Threatened Species
|
*a species that has a declining population and that is likely to become endangered if it is not protected.
|
|
|
How do Humans cause Extinctions?
|
*the major cause today is the destruction of habitats, the introduction of nonnative species, pollution, and the overharvesting of species.
|
|
|
Exotic Species
|
*a species that is not native to a particular region.
|
|
|
Poaching
|
*illegal crime of hunting, fishing, harvesting and trading of wildlife.
|
|
|
Endemic species
|
*species that are native to and found only within a limited area.
|
|
|
Biodiversity Hotspots
|
*the most threatened areas of high species diversity on earth have been labeled biodiversity hotspots.
|
|
|
Cative-Breeding Programs
|
*wildlife experts may attempt to restore the population of a species through cative breeding programs.
*The hope is to then reintroduce the population to their natural habitat. |
|
|
Germ Plasm
|
*method to save a species by preserving its genetic material that contains the reproductive, germ, cells of a plant or animal.
|
|
|
Germ Plasm banks
|
*store germ plasm for future use in research or species recovery efforts.
|
|
|
Zoos, Aquarium, Parks, and Gardens
|
*the original idea of zoos was to put exotic animals on display.
*in some cases this is the last effort for survival. |
|
|
Preserving Havitats and Ecosystems
|
*most effective way to save species is to protect their habitats.
|
|
|
Endangered Species Act
|
*1973 U. S. Congress passed this law to protect plant and animal species in danger of extinction.
|
|
|
Habitat Conservation Plan
|
*attempts to protect one ormore species across large areas of land through trade-offs or cooperactive agreements.
|
|
|
International Cooperation
|
*
|
