Chapter 56: Conservation Biology and Global Change Flashcards Preview

Biology 170 > Chapter 56: Conservation Biology and Global Change > Flashcards

Flashcards in Chapter 56: Conservation Biology and Global Change Deck (17)
Loading flashcards...
1

Conservation biology

Branch of biology specifically focused on conserving biological diversity

2

What do conservation biologists do?

Attempt to understand the factors that affect maintenance, loss, and restoration of diversity

3

Why might conservation biologists need to have experience in other fields?

- Lots of sub-disciplines that are essential to aspects of conservation biology

4

Three levels of biodiversity

- Genetic diversity
- Species diversity
- Ecosystem diversity

5

Importance of genetic diversity

- Genetic variation within population facilitates natural selection

6

Species diversity

Number and evenness of species in small plot, ecosystem, biosphere

7

Importance of biodiversity

- Important for natural selection, different roles of each species in communities and ecosystems, interconnections among species and abiotic factors
- Medications contain substance originally found in plants

8

Importance of ecosystem diversity

- Loss of certain habitats and groups of species results from loss of ecosystem

9

Why are conservational biologists worried about species loss?

- Current rate of extinction matches that of mass extinctions in past--this time w're causing it

10

Ecosystem services

- Services provided by ecosystems that help sustain human life
- Often taken for granted (purification of air, pollination, recycling of nutrients...)
-$1 billion to preserve Catskills vs. estimated $8 billion for water treatment plant

11

Threats to biodiversity

1) Habitat loss and degradation (greatest threat)
2) Introduced species
3) Overexploitation
4) Global change (climate, atmospheric chemistry...)

12

Fragmentation and diversity

- Type of habitat loss; diversity decreases

13

Introduced species

- Non-native species introduced and wipes it outtttt
- Predation upon native prey/lack of competition

14

Overexploitation

- Harvesting wild organisms at rates exceeding ability of those populations to rebound

15

Current CO2 concentration in atmosphere

- 400 ppm

16

How elevated CO2 levels affect populations and whatnot?

Forests have increased productivity; now limited by nutrients

17

How to conserve biodiversity?

- Require conserving landscape and seascape
- Make informed decisions through ecological understanding
- Make conservation of biodiversity part of land-use planning