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bio > module 4.2 > Flashcards

module 4.2 Flashcards

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Biology 101 flashcards
1
Q

COMMUNITY definition

A

all the living organisms, of a species, living in the same place at the same time (interacting populations)

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2
Q

SPECIES definition

A

a group of organisms with simmilar morphology and physiology. Can interbreed to produce fertile offspring

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3
Q

ECOSYSTEM definition

A
  • a self contained system including all the living organisms and their environment interacting with each other (biotic and abiotic)
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4
Q

HABITAT definition

A
  • a place where an organism lives
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5
Q

POPULATION definition

A
  • a group of organisms of the same species, living in the same place at the same time, and able to interbreed with each other
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6
Q

whats biodiversity

A

biodiversity is a measure of all the different plant, animal, fungal and other microorganism species worldwide, the genes they contain and the ecosystems which they form a part - there are 3 levels of biodiversity.(the variety of living organisms in an area)

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7
Q

what are the 3 levels of biodiversity

A
  • habitat biodiversity
  • species biodiversity
  • genetic biodiversity
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8
Q

what’s habitat biodiversity

A

the number of different habitats found in a region

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9
Q

what’s species biodiversity

A

the number of species in a given habitat/ ecosystem .( rainforest vs grass), there are two subsections…

  • species richness= related to the number of species present
  • species evenness= the relative abundance of individuals of each species
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10
Q

whats genetic biodiversity

A

the number of genetic variation in a species i.e, more alleles= more biodiversity

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11
Q

how do you measure species richness

A
  • count the number of different species
  • can sue the random quadrat technique
  • no need to identify species
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12
Q

how do u measure species evenness

A
  • plants= use random quadrats, count the number of each species or % cover
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13
Q

what is spearman’s rank

A

a statistical test used to determine whether the relationship between 2 variables is statistically significant. rs= spearman’s rank value

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14
Q

what does it mean if there is a negative rs= spearman’s rank value

A

a negative correlation

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15
Q

what does it mean if there is a positive rs= spearman’s rank value

A

a positive correlation

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16
Q

whats P value

A

a statistic that determines if an observation is significant. i.e very unlikely to be due to chance.
P<0.05= observation is significant
<5% chance the results were random

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17
Q

why do we measure biodiversity

A
  • economic reasons ( to understand/ asses the impact of development on the environment.
  • identify trends in extinction
  • pure understanding of our existence.
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18
Q

why do you take random sampling

A

to avoid bias

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19
Q

what are the 3 types of non-random sampling

A

systematic, opportunistic, stratified

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20
Q

what is (non-random) systematic sampling

A

when samples are taken at fixed intervals, often along a line (which is called a transect)

21
Q

what is (non-random) opportunistic sampling

A

when samples are chosen by the investigator. its used because its simple to carry out, but the data will be biased

22
Q

what is (non-random) stratified sampling

A

when different areas in a habitat are identified and sampled separately in proportion to part of their habitat as a whole.

23
Q

what 2 factors does the Simpsons index take into account

A

species evenness and species richness

24
Q

what number is the Simpsons index of diversity always between

A

0 and 1

25
Q

what happens if a population has low genetic biodiversity

A

it might get wiped out as they may not be able to adapt to change

26
Q

give an example where genetic diversity might be low

A

isolated populations such as those bred in captivity

27
Q

what are alleles

A

different versions of a gene

28
Q

where are alleles of the same gene found

A

they are found at the same locus (point)

29
Q

what does polymorphism describe

A

a locus that has two or more alleles

30
Q

how do u calculate genetic diversity

A

proportion of polymorphic gene loci= number of polymorphic gene loci/ total number of loci

31
Q

what are the 3 factors affecting global biodiversity

A

human population growth, increased use of monoculture in agriculture, climate change

32
Q

why does human population growth lead to loss of biodiversity

A

human population growth has led to…

  • habitat loss- due to human development
  • over-exploitation-now a greater demand for resources
  • urbanisation- cities and road developments can isolate species- unable to interbreed
  • pollution- kill species or destroy habitats
33
Q

why does increased use of monoculture in agriculture lead to loss of biodiversity

A
  • habitats are lost due to clearing of land
  • local and naturally occurring animals/plants are seen as pests and weeds so destroyed reducing species diversity
  • traditional crops are lost because they don’t make enough money
34
Q

why does climate change lead to loss of biodiversity

A
  • most species need a particular climate to survive.
  • change= area becomes uninhabitable
  • could increase or decrease range of species
  • species distribution may change due to migration
  • if something cant migrate fast enough, biodiversity is reduced
35
Q

what are the 3 reasons why maintaining biodiversity is important

A
  • ecological reasons
  • economic reasons
  • aesthetic reasons
36
Q

why is maintaining biodiversity is important for ecological reasons

A

1) to protect species including keystone species (many other species depend on this species)

  • organisms are interdependent
  • the loss of just one species can lead to… disruption of food chain, disruption of nutrient cycles

2) to maintain genetic resources

-genetic resources are any material from plants, animals or microorganisms containing genes which we find valuable
-genetic resources provide us with everyday products like;
food and drink, clothing, drugs, fuels, industrial materials

37
Q

why is maintaining biodiversity is important for economic reasons

A

1) to reduce soil depletion

  • monoculture is growing a single variety of a single crop
  • continuous monoculture= planting the same crop in the same field without interruption
  • continuous monoculture causes soil depletion
  • the economic costs of soil depletion includes increased spending on fertilizers and decreased yields
38
Q

why is maintaining biodiversity is important for aesthetic reasons

A

1) areas rich in biodiversity provide pleasant attractive landscapes
2) the more biodiversity, the more likely it is to attract visitors- has economic advantages

39
Q

what does in situ conservation do

A

keeps species in their natural habitats

40
Q

what does ex situ conservation do

A

removes species from their natural habitats (off site conservation)- normally the last resort

41
Q

why is conservation important

A

to ensure the survival of endangered species

42
Q

outline the methods of in situ conservation

A

1- establishing national parks or wildlife reserves- restricts urban development, farming or industrial development, also controlled fishing zones
2-controlling or preventing the introduction of species that threaten local biodiversity
3-protecting habitats so organisms can continue to thrive
4- promoting particular species e.g. protecting food sources
5- giving legal protection to endangered species, e.g. making it illegal to kill them

43
Q

advantages and disadvantages of in situ conservation

A

+ both species and their habitat are conserved
+ larger populations can be protected and its less disruptive than removing organisms
+ changes of the population recovering are greater
- can be difficult to control factors that are threatening species

44
Q

outline the methods of ex situ conservation

A

1) relocating an organism to a safer area
2) breeding organisms in captivity then reintroducing them into the wild when they are strong enough
3) botanic gardens= controlled environments which grow a variety of rare plants for purposes of conservation, research, display and education

45
Q

advantages and disadvantages of ex situ conservation

A

+ used to protect individual animals in a controlled environment
+can be used to reintroduce a species that left an area
- only a small number of individuals can be cared for
- can be difficult and expensive to sustain and create the right environment
- may catch a disease from humans
-less successful than in situ
-many species cant breed successfully in captivity
-don’t adapt to their new environment when moved to a new location

46
Q

what are the 2 international corporations that are important in species conservation

A
  • Rio Convention on Biological Diversity (CBD)

- CITES Agreement

47
Q

outline the aim of the international cooperation:

Rio Convention on Biological Diversity (CBD)

A

1) aims to develop international strategies on the conservation of biodiversity and how to use animal and plant resources in a sustainable way
2) the convention made it part of international law that conserving biodiversity is everyone’s responsibility
3) it also provides guidance to govs on how to conserve biodiversity

48
Q

outline the aim of the international cooperation:

CITES Agreement

A

1) CITES (Convention of International Trade in Endangered Species) is an agreement designed to increase international cooperation in regulating trade in wild animal and plant specimens
2) The member countries all agreed to make it illegal to kill endangered species
3) helps conserve species by limiting trade through licencing, and by making it illegal to trade in products made from endangered animals
4) designed to raise awareness of threats to biodiversity through education

bio (29 decks)

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