Biodiversity Flashcards

1
Q

what do rainforests provide?

A
  • medicine
  • food and products
  • their own rainfall
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2
Q

what is biodiversity?

A

the variety of living organisms present in an area

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3
Q

what is habitat biodiversity?

A

the number of different habitats found within an area

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4
Q

what is species richness?

A

the number of different species living in a particular area

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5
Q

what is species evenness?

A

a comparison of the numbers of individuals of each species living in a community

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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

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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
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8
Q

when is an environmental impact assessment taken?

A

before a major project

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9
Q

what does the EIA attempt to predict?

A

the positive and negative effects of a project on the biodiversity of an area

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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
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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

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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
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13
Q

What is sampling?

A

Taking measurements of a limited number of individual organisms present in a particular area

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14
Q

What is sampling used for?

A

To measure biodiversity of a habitat

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15
Q

What is random sampling?

A

Selecting individuals by chance

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16
Q

How can you make your sampling random?

A

Use a grid and generate random numbers

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17
Q

When is random sampling used?

A

Used if the area looks uniform or the distribution is patchy

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18
Q

Why is random sampling used?

A
  • It removes bias
  • ensures sample is representative
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19
Q

What is non random sampling?

A

An alternative sampling method where the sample is not chosen at random

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20
Q

What are the three ways non random sampling can be carried out?

A
  • opportunistic
  • stratified
  • systematic
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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
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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
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23
Q

What is systematic sampling?

A
  • different areas within a habitat are identified and sampled
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24
Q

What are the types of transects

A

Line of belt

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25
Q

What are the types of belt transects?

A

Continuous or interrupted

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26
Q

Why may a sample not be representative of organisms present in a habitat?

A
  • sampling bias
    - selection process may be biased
    - reduced by random sampling
  • chance
    - organisms selected may not be representative
    - minimised by using a larger sample
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27
Q

Describe how a pooter can be used to collect small insects

A

The tube sucks small bugs into the jar

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28
Q

When would a sweep net be useful?

A

To catch flying insects that live in long grass

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29
Q

Explain how a pitfall trap works

A

There is a small pit in the ground that small bugs fall in to. They have a lid to prevent flooding

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30
Q

Explain how tree beating can be used to collect invertebrates

A

Beating a tree releases bugs from it which fall into the net underneath

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31
Q

Explain how kick sampling can be used to study organisms living in a river

A

Kicking river bed releases organisms which get caught in the net further down

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32
Q

What is the definition of niche?

A

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

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33
Q

What is the definition of habitat?

A

The part of an ecosystem where a particular organisms lives

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34
Q

What is an ecosystem?

A

The interactions between all organisms and their environment in a particular area

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35
Q

What is the definition of abiotic factors?

A

The non living physical and chemical factors in an ecosystem that affect a populations distribution and abundance

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36
Q

What is population?

A

A group of organisms of the same species living in the same place at the same time who can interbreed

37
Q

What is the definition of biotic factors?

A

An environmental factor caused by other living organisms that effect a populations distribution and abundance

38
Q

What is biodiversity?

A

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
Q

What is a community?

A

The sum total of all living organisms of all species living in the same place at the same time

40
Q

What is a species?

A

A group of organisms that are able to breed together to make fertile offspring and have the same morphology, anatomy, physiology and behaviour

41
Q

What is species richness?

A

The number of species present in a habitat

42
Q

What is species evenness?

A

The comparison of the numbers of individuals of each species living in a community

43
Q

What is the equation for measuring diversity index and what do the symbols mean?

A

1- (n/N) 2^ n= number of individuals for each species living
N = total number of all individuals

44
Q

What is the scale of diverse habitats and what do the numbers mean?

A

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
Q

What are genetic bottlenecks?

A

When a population initially has lots of alleles but an event occurs that reduces the number of individuals in the population

46
Q

What can genetic bottlenecks result in?

A

A reduction in the gene pool as only some alleles available to be passed on

47
Q

What are some effects of low genetic diversity?

A
  • means populations cannot adapt well to environmental changes and have trouble recovering from disease
  • may result in extinction
48
Q

What is the founder effect?

A

When a few individuals from a population move to a new location

49
Q

What is genetic drift?

A

Random as to which alleles are passed down therefore frequency of allele occurrence varies

50
Q

What can genetic drift lead to?

A

Allele disappearing from a population

51
Q

What is used to measure genetic biodiversity?

A

Polymorphism

52
Q

What does it mean for a population when there is a greater proportion of polymorphic gene loci?

A

There is a greater biodiversity of the population

53
Q

What is the equation for the proportion of polymorphic gene loci?

A

Number of polymorphic gene loci/ total number of loci

54
Q

What is polymorphism?

A

genes that have more than one allele

56
Q

What happens during gel electrophoresis?

A
  • dna is fragmented with restriction enzymes
  • it is run through a gel
  • smaller segments move faster and further than large segments
57
Q

What creates genetic biodiversity within a species?

A

Differences in alleles among individuals of a species

58
Q

Why is it beneficial for a species to be more genetically diverse?

A

They are more likely to be able to adapt to changes in their environment and so are less likely to become extinct

59
Q

What needs to occur for genetic biodiversity to increase?

A

The number of possible alleles in a population must increase

60
Q

What is the definition of mutation?

A

Changes to the base sequence in the DNA

61
Q

What is gene flow?

A

When a individual migrates from one population and breeds with a member of another population, alleles are transferred between the two populations

62
Q

What is an allele?

A

Different versions of the same gene

63
Q

What needs to occur for genetic biodiversity to decrease?

A

The number of possible alleles in a population must also decrease

64
Q

How does artificial cloning redux genetic biodiversity?

A

They are clones so there is no genetic biodiversity

65
Q

How does natural selection reduce genetic biodiversity?

A

Only selecting advantageous alleles

66
Q

How does natural selection reduce genetic biodiversity?

A

It only selects advantageous advantageous alleles

67
Q

Why do conservation agreements exist?

A
  • 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
Q

What is the environmental stewardship scheme?

A

Conservation scheme at local level that offers governmental payments to farms to enhance and converse landscapes

69
Q

What are the environmental stewardship schemes aims?

A

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
Q

what does the IUCN stand for?

A

International Union for the Conservation of Nature

71
Q

what do the IUCN do?

A
  • 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
Q

what are some examples of what the IUCN have done?

A
  • compiled a red list
  • provide info to guide actions
  • helped reduce over fishing and over hunting
73
Q

what does CITES stand for?

A

Convention of International Trade in Endangered Species of Wild Fauna and Flora

74
Q

what do CITES do?

A
  • 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
Q

what is an example of how CITES have helped species?

A

almost 40000 species have been protected

76
Q

what are some problems with CITES?

A
  • very limited in its potential effectiveness- fails to address habitat loss to create mechanisms to the supply of wildlife products
77
Q

what does the Rio Convention stand for?

A
  • CBD- Convention on biological diversity
  • UNCCD- united nations convention to combat desertification
  • UNFCCC- united nations framework convention on climate change
78
Q

what are the aims of the Rio convention?

A
  • 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
Q

what is in situ conservation?

A

conservation within the habitat

80
Q

what is ex situ conservation?

A

conservation out of the natural habitat

81
Q

what is sustainable development?

A

economic development that meets the needs of people today, without limiting the ability of the future generations to meet their needs

82
Q

what is a seed bank?

A

a store of genetic material from plants in the form of seeds

83
Q

what are key stone species?

A

species which are essential for maintaining biodiversity- they have a disproportionately large effect on the environment relative to their abundance

84
Q

what is captive breeding?

A

producing offspring of species in a human-controlled environment

85
Q

what is conservation?

A

the preservation and careful management of the environment and natural resources

86
Q

what does extinct mean?

A

no organisms of the species exist anywhere in the world

87
Q

what does endangered mean?

A

a species that is in danger of extinction

88
Q

what does it mean when an animal is vulnerable?

A

a species that is considered likely to become endangered in the near future

89
Q

what does it mean if a species is extinct in the wild?

A

organisms of the species exit only in captivity