Biodiversity Flashcards
1
Q
what do rainforests provide?
A
- medicine
- food and products
- their own rainfall
2
Q
what is biodiversity?
A
the variety of living organisms present in an area
3
Q
what is habitat biodiversity?
A
the number of different habitats found within an area
4
Q
what is species richness?
A
the number of different species living in a particular area
5
Q
what is species evenness?
A
a comparison of the numbers of individuals of each species living in a community
6
Q
what is genetic biodiversity?
A
the variety of genes within a species- many of these will be the same so it becomes the variety of alleles in a population
7
Q
why do we measure biodiversity?
A
- important role in conservation
- informs scientists of the species that are present
- provides a baseline for the level of biodiversity in an area
- allows the effects, if any, to the environment to be measured
8
Q
when is an environmental impact assessment taken?
A
before a major project
9
Q
what does the EIA attempt to predict?
A
the positive and negative effects of a project on the biodiversity of an area
10
Q
what does the EIA look for?
A
- gains/loses in variety of species
- gains/loses in space available for ecosystems and habitats
- gains/loses in physical connectiveness between ecosystems and habitats
- environmental changes within ecosystems and habitats
11
Q
Suggest why the habitat biodiversity would be greater in the Amazon rainforest than the Sahara desert?
A
There is more food and shelter in the rainforest and has a less harsh environment than the desert
12
Q
Explain why intensive farming has reduced the habitat diversity of the UK countryside?
A
- cutting down bushes to increase size of farms
- insects and birds home gone - pesticides and insecticides
13
Q
What is sampling?
A
Taking measurements of a limited number of individual organisms present in a particular area
14
Q
What is sampling used for?
A
To measure biodiversity of a habitat
15
Q
What is random sampling?
A
Selecting individuals by chance
16
Q
How can you make your sampling random?
A
Use a grid and generate random numbers
17
Q
When is random sampling used?
A
Used if the area looks uniform or the distribution is patchy
18
Q
Why is random sampling used?
A
- It removes bias
- ensures sample is representative
19
Q
What is non random sampling?
A
An alternative sampling method where the sample is not chosen at random
20
Q
What are the three ways non random sampling can be carried out?
A
- opportunistic
- stratified
- systematic
21
Q
What is opportunistic sampling?
A
- weakest form of sampling as it may not be representative of the population
- uses organisms that are conveniently available
22
Q
What is stratified sampling?
A
- some populations can be divided into strata (sub groups) based on a particular characteristic
- a random sample is then taken from each of these strata proportional to its size
23
Q
What is systematic sampling?
A
- different areas within a habitat are identified and sampled
24
Q
What are the types of transects
A
Line of belt
25
What are the types of belt transects?
Continuous or interrupted
26
Why may a sample not be representative of organisms present in a habitat?
- sampling bias
- selection process may be biased
- reduced by random sampling
- chance
- organisms selected may not be representative
- minimised by using a larger sample
27
Describe how a pooter can be used to collect small insects
The tube sucks small bugs into the jar
28
When would a sweep net be useful?
To catch flying insects that live in long grass
29
Explain how a pitfall trap works
There is a small pit in the ground that small bugs fall in to. They have a lid to prevent flooding
30
Explain how tree beating can be used to collect invertebrates
Beating a tree releases bugs from it which fall into the net underneath
31
Explain how kick sampling can be used to study organisms living in a river
Kicking river bed releases organisms which get caught in the net further down
32
What is the definition of niche?
The role of an organism within an ecosystem, the effects it has on other components of the ecosystem and the effects they have on it
33
What is the definition of habitat?
The part of an ecosystem where a particular organisms lives
34
What is an ecosystem?
The interactions between all organisms and their environment in a particular area
35
What is the definition of abiotic factors?
The non living physical and chemical factors in an ecosystem that affect a populations distribution and abundance
36
What is population?
A group of organisms of the same species living in the same place at the same time who can interbreed
37
What is the definition of biotic factors?
An environmental factor caused by other living organisms that effect a populations distribution and abundance
38
What is biodiversity?
The variety of habitats, communities and species in an area and the genetic diversity within populations. It included diversity within a species, between species and of ecosystems
39
What is a community?
The sum total of all living organisms of all species living in the same place at the same time
40
What is a species?
A group of organisms that are able to breed together to make fertile offspring and have the same morphology, anatomy, physiology and behaviour
41
What is species richness?
The number of species present in a habitat
42
What is species evenness?
The comparison of the numbers of individuals of each species living in a community
43
What is the equation for measuring diversity index and what do the symbols mean?
1- (n/N) 2^ n= number of individuals for each species living
N = total number of all individuals
44
What is the scale of diverse habitats and what do the numbers mean?
Scale of 0-1
High value = more diverse habitats, more stable and can withstand a lot of change therefore high species evenness and richness
45
What are genetic bottlenecks?
When a population initially has lots of alleles but an event occurs that reduces the number of individuals in the population
46
What can genetic bottlenecks result in?
A reduction in the gene pool as only some alleles available to be passed on
47
What are some effects of low genetic diversity?
- means populations cannot adapt well to environmental changes and have trouble recovering from disease
- may result in extinction
48
What is the founder effect?
When a few individuals from a population move to a new location
49
What is genetic drift?
Random as to which alleles are passed down therefore frequency of allele occurrence varies
50
What can genetic drift lead to?
Allele disappearing from a population
51
What is used to measure genetic biodiversity?
Polymorphism
52
What does it mean for a population when there is a greater proportion of polymorphic gene loci?
There is a greater biodiversity of the population
53
What is the equation for the proportion of polymorphic gene loci?
Number of polymorphic gene loci/ total number of loci
54
What is polymorphism?
genes that have more than one allele
56
What happens during gel electrophoresis?
- dna is fragmented with restriction enzymes
- it is run through a gel
- smaller segments move faster and further than large segments
57
What creates genetic biodiversity within a species?
Differences in alleles among individuals of a species
58
Why is it beneficial for a species to be more genetically diverse?
They are more likely to be able to adapt to changes in their environment and so are less likely to become extinct
59
What needs to occur for genetic biodiversity to increase?
The number of possible alleles in a population must increase
60
What is the definition of mutation?
Changes to the base sequence in the DNA
61
What is gene flow?
When a individual migrates from one population and breeds with a member of another population, alleles are transferred between the two populations
62
What is an allele?
Different versions of the same gene
63
What needs to occur for genetic biodiversity to decrease?
The number of possible alleles in a population must also decrease
64
How does artificial cloning redux genetic biodiversity?
They are clones so there is no genetic biodiversity
65
How does natural selection reduce genetic biodiversity?
Only selecting advantageous alleles
66
How does natural selection reduce genetic biodiversity?
It only selects advantageous advantageous alleles
67
Why do conservation agreements exist?
- preventing species extinction
- animals migrate freely so international agreements must be put in place to protect species across boarders
- ensures all endangered species are preserved and protected
- human activities contribute to biodiversity loss
68
What is the environmental stewardship scheme?
Conservation scheme at local level that offers governmental payments to farms to enhance and converse landscapes
69
What are the environmental stewardship schemes aims?
1) make conservation a normal farming practice
2) sustaining diversity of a landscape
3) improving wild life habitats
4) restoring neglected land
5) conserving archaeological features
6)improving opportunities for countryside enjoyment
70
what does the IUCN stand for?
International Union for the Conservation of Nature
71
what do the IUCN do?
- influence, encourage and assist society's throughout the world to conserve nature and ensure that any use of natural resources is equitable and ecologically stable
72
what are some examples of what the IUCN have done?
- compiled a red list
- provide info to guide actions
- helped reduce over fishing and over hunting
73
what does CITES stand for?
Convention of International Trade in Endangered Species of Wild Fauna and Flora
74
what do CITES do?
- ensure that international trade in specimens of wild animals and plants does not threaten the survival of the species
- all imports, exports, re-exports and introductions are covered by the convention
75
what is an example of how CITES have helped species?
almost 40000 species have been protected
76
what are some problems with CITES?
- very limited in its potential effectiveness- fails to address habitat loss to create mechanisms to the supply of wildlife products
77
what does the Rio Convention stand for?
- CBD- Convention on biological diversity
- UNCCD- united nations convention to combat desertification
- UNFCCC- united nations framework convention on climate change
78
what are the aims of the Rio convention?
- CBD- conserving an sustaining the use of natural resources
- UNCCD- address land degradation to prevent desertification
- UNFCCC- nations required to stabilise greenhouse gas concentrations
79
what is in situ conservation?
conservation within the habitat
80
what is ex situ conservation?
conservation out of the natural habitat
81
what is sustainable development?
economic development that meets the needs of people today, without limiting the ability of the future generations to meet their needs
82
what is a seed bank?
a store of genetic material from plants in the form of seeds
83
what are key stone species?
species which are essential for maintaining biodiversity- they have a disproportionately large effect on the environment relative to their abundance
84
what is captive breeding?
producing offspring of species in a human-controlled environment
85
what is conservation?
the preservation and careful management of the environment and natural resources
86
what does extinct mean?
no organisms of the species exist anywhere in the world
87
what does endangered mean?
a species that is in danger of extinction
88
what does it mean when an animal is vulnerable?
a species that is considered likely to become endangered in the near future
89
what does it mean if a species is extinct in the wild?
organisms of the species exit only in captivity
