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A2 GEOGRAPHY > Ecosystems > Flashcards

Ecosystems Flashcards

1
Q

Definition of an Ecosystem?

A

A system in which organisms react with eachother and their environment

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2
Q

Definition of ecology?

A

The study of communities of living organisms and their relationship to their living environment

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3
Q

Definition of biomes?

A

Large areas cutting across continents yet each with their own characteristics

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4
Q

What are zones?

A

Units within biomes

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5
Q

What are Habitats?

A

More specific conditions with an adapted community

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6
Q

What is biomass?

A

The total weight of all organisms including dead plant matter

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7
Q

What is the aim of conservation areas?

A

To protect and restore natural ecosystems. By protecting species and their habitats to support the biodiversity.

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8
Q

What are other reasons for developing ecological conservation areas?

A

Improves appearance of an area- e.g. Brownfield sites
Stimulating investment to encourage multiplier effect- e.g. Tourism
Managing flood risk- e.g.- afforestation

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9
Q

How do we afford conservation areas?

A

Limited budget

Rely on volunteers

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10
Q

What is the governmental principal advisor on the natural environment?

A

Natural England

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11
Q

3 examples of conservation areas?

A

SSSI- Natural England
National nature reserves- National trust and RSPB
Local Nature reserve

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12
Q

How is Sheffield blue loop funded?

A

By Natural England and the National lottery

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13
Q

How is the blue loop managed?

A

By a partnership of Groundwork Sheffield and the River Stewardship company

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14
Q

What is the aim of the blue loop?

A

The support and engage local communities along the waterside environment

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15
Q

History of Blue loop Sheffield?

A

The river don was used for industry but was difficult to navigate.
The opening of the Sheffield and Tinsley canal in 1819 provided the infrastructure for mass export of coal and steel.
In 1848 railway was introduced.
Decline of canal and associated industries.

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16
Q

Native species to blue loop?

A

Fish- fish ladders have been built to allow upstream movement
Otters- secluded nesting and breeding habitats provided
Butterflies- nettles along the canal provide perfect habitat

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17
Q

Benefits of the scheme?

A

Encouraged tourism and private investment
Reduced flood risk
Provides recreational activity

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18
Q

Where is the tropical equatorial rainforest located?

A

Within the tropics, between the Tropic of Capricorn and Tropic of Cancer
Lies within 5 degrees of the equator

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19
Q

Figures on tropical biome?

A

Rainforest covers less than 5% of the earths surface. It halved in 200 years. Support 50% of all living organisms

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20
Q

Temperature characteristic of the rainforest?

A

A low diurnal temperature range. Day 28 night 22

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21
Q

Rainfall in the rainforest?

A

Daily conventional storms
2M of rain each year
Violent storms occur in afternoon following intense heat

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22
Q

Other characteristics of the rainforest?

A

A year round growing season- average day 12 hours of sunlight
High humidity- rapid evapotranspiration

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23
Q

Number of species and trees found in the rainforest?

A

50 million species of animal

480 tree species per hectare

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24
Q

What is the stratification of the rainforest?

A 
Emergent layer- 30-40m
Canopy- 20-30m
Understory- 10-20m
Shrub layer 
Forest floor
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25
Q

Describe the soil in a rainforest?

A

Rapid chemical weathering of bedrock
Soils are fragile and depend on leaf fall for nutrients
The rapid decomposition of litter and work of biota results in a thin humus layer

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26
Q

What are the main causes of deforestation in the Amazon?

A

Farming- eg Cattle ranching, Cash crops plantations e.g. palm oil and soya (used to feed chickens in U.K. Fast food chains)
Mining- Amazon is the largest source of iron ore
Logging- timber production

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27
Q

Further causes of Amazon deforestation?

A

Road construction- The Trans- Amazonian Highway extends 6000km into Brazil’s interior
Settlement growth- migration from poorest parts of Brazil

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28
Q

Environmental impacts of Amazonian deforestation?

A

Shifting cultivation not successfully carried out, plots lost fertility and yields decline. Knock on effect to natural cycles and species diversity.
Mononcultures demand high amounts of fertilisers and pecticides. Leaching enters water killing fish

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29
Q

Positive economic impacts of Amazonian deforestation?

A

HEP Project delivers power for mining. Minining employs over 7000 workers

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30
Q

Who came up with the process of nutrient cycling?

A

Gersmehl

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31
Q

How do the nutrient cycling diagrams work?

A

The thicker the arrow the larger the flow.

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32
Q

Difference between nutrient cycle in rainforest and woodland.

A

Soil is larger in woodland
Higher precipitation input in rainforest therefore higher runoff
Larger litter in woodland
Weathering input higher in rainforest

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33
Q

Inputs into nutrient cycling?

A

Precipitation

Weathering

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34
Q

Outputs in nutrient cycling?

A

Run off

Leaching

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35
Q

Processes in nutrient cycling?

A

Leaf fall
Litter decomposition
Plant nutrient uptake

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36
Q

Stores in nutrient cycling?

A

Biomass
Litter
Soil

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37
Q

Trophic levels?

A

Autotrophs
Primary consumers
Secondary consumers
Tertiary consumers

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38
Q

Function of reducer organisms?

A

Return remaining nutrients back to the soil for plant growth

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39
Q

How much energy is lost at each trophic level?

A

90%

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40
Q

How are energy losses illustrated?

A

Energy pyramids

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41
Q

What is urban wasteland?

A

Abandoned land that has been left for nature to take its course

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42
Q

Examples of urban wasteland?

A

Brownfield sites- former factories, route ways and railways

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43
Q

First step in wasteland succession?

A

Pioneer species colonise bare surfaces, death of these adds humus and moisture to the layer

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44
Q

Second step in wasteland succession?

A

Seed plants grow in sheltered cracks with moisture available

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45
Q

Final step of wasteland succession?

A

Tall herbs outcompete smaller species where nutrients are.

Taller grass and bushes thrive in deeper soils

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46
Q

Positive non-native species?

A

Tomato and corn

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47
Q

Figure on Japanese knotweed?

A

Has doubles its coverage in the last 20 years. Mostly present along Londons waterways

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48
Q

How can Japanese knotweed be killed?

A

Strong herbicides and burning roots

49
Q

What is the soil profile of the tropical equatorial rainforest?

A

Iron and aluminium build up gives the soil a dark red colour
Clays produced further down
Some redeposited silica gives a yellowish colour
Weathered bed rock and parent material

50
Q

Why is leaching high in the tropical rainforest?

A

Heavy rainfall

51
Q

Statistic on Japan and need for logging?

A

Japan is solely responsible for using 11 million cubic metres of equatorial hardwood each year

52
Q

Example of mining in the Amazon?

A

Carajus in Amazonia is home to the largest source of iron ore

53
Q

What are other reasons for deforestation?

A

Road construction- Trans Amazonian highway
Hydro-electric power
Settlement growth

54
Q

Statistics about Brazil’s people?

A

Over 25 million landless people

55
Q

Background to deforestation?

A

1950’s- beginning of mechanised logging and development of integrated transport and infrastructure has caused the deforestation rates to soar

56
Q

Environmental impacts of deforestation?

A

Approx 20,000 tropical equatorial rainforest species become extinct each year.
Increased flooding- change in rainfall patterns

57
Q

What roles do tropical equatorial rainforests play in the carbon cyle?

A

A tropical equatorial tree is a carbon sink for 22.5kg of carbon dioxide each year.
Burning the rainforest accounts for 20% of the global atmospheric carbon dioxide each year

58
Q

Economics impact of deforestation?

A

Workers exploited by corrupt government or TNC powerhouses. The economic benefit rarely trickles down.
The world bank has supported plans to expand timber production in Congo and Indonesia

59
Q

Social impacts of deforestation?

A

The Quichua Indians of Tina, in Ecuador. Native people who inhabit rainforest. Deforestation destroys their social cohesion, language, culture and tradition.

60
Q

Government corruption in Brazil?

A

Brazilian government offers rainforest land to those better off financially- sidelining smaller settlers
By offering subsidies to large commercial operations.

61
Q

What export is Brazil a world leader in?

A

TNC’s frequently from USA have made Brazil a world leader in beef and soya exports

62
Q

Social tensions in the Amazon?

A

Miners try to illegally steal land from native Indians.
The traditional Yanomami and Yekuana tribes oppose mining.
New settlers bring diseases- Panara Indians have all but been wiped out

63
Q

What is an example of an agribusiness?

A

Cargill

A large US transnational food, agricultural, financial and industrial agribusiness

64
Q

Background figures on Cargill?

A

Employs 138,000 people in 67 countries

In 2009 recorded net profit of over $3.3 billion.

65
Q

Cargills commitments?

A

We will develop ways of reducing environmental impacts and help conserve natural resources
We will invest in communities where we work

66
Q

How is Cargill environmentally unsustainable?

A

Arrived in Brazil in 1965

Between 2002 and 2004 annual deforestation rates have jumped from 15,000 to 28,000 hectares where Cargill operates

67
Q

Area where Cargill operates?

A

Santarém

68
Q

What is the predominant use for soya?

A

97% for animal feed

69
Q

Fact in Brazil and U.K.?

A

78% of UK soya beans are from Brazil

70
Q

Example of unsustainable tourism?

A

In 1992- The Bwindi Impenetrable Forest was upgraded to a national park. The indigenous Batwa Pygmies were removed.

71
Q

When are non-native species bad?

A

When they compete with native plants, have no predators

72
Q

Niches along routways?

A

Restricted access- railways
Air pollution
Halophytes from salt spreading
Afforestation

73
Q

Examples of adapted plant communities?

A

Xerophytes

Hydrophytes

74
Q

What is vegetation succession?

A

How plant communities evolve and develop over time

75
Q

What is each stage in succession called?

A

A sere

76
Q

What occurs if succession occurs without being disturbed?

A

Vegetarian climax

Vegetation is in equilibrium with the environment

77
Q

Definition of Climatic climax?

A

The final stage of natural succession where vegetation is in equilibrium with the climatic and environmental conditions.

78
Q

What are the 2 types of succession?

A

Primary and secondary

79
Q

Describe primary succession?

A

On surfaces which haven’t had previous vegetation growing their. E.g.- bare rock after a volcanic eruption

80
Q

Describe secondary succession?

A

On surfaces which have been colonised by vegetation previously, but have since been changed or destroyed.
E.g.- deforestation

81
Q

How do the pioneer species induce growth of the next sere?

A

Hardier plants die and decompose by bacteria

Weathering breaks down rock and adds to humus

82
Q

What does each seral stage have?

A

Increase in height of plants and no. Of species

83
Q

Hydrosere step 1.

A

Spores of algae and mosses blow onto water surface creating a pioneer community of floating vegetation

84
Q

Hydrosere step 2.

A

Floating and submerged water weeds (lillies) can then develop

85
Q

Hydrosere step 3

A

These weeds trap sediment at the waters edge to allow marsh plants such as reeds and rushes to establish

86
Q

Hydrosere step 4

A

Continuing sedimentation of silt and plant debris slowly builds which will eventually rise above water

87
Q

What is a Carr?

A

A low lying area of land emerging from a fresh water pond or lake

88
Q

Hydrosere step 5

A

This will produce a Carr of small shrubs and trees such as willow and alder

89
Q

Hydrosere step 6

A

Finally the climatic climax of oak and ash trees can emerge. Dominating the whole site once the pond silts up entirely

90
Q

Features of the temperate deciduous woodland biome?

A

Dominant oak trees- ave 20m
Leaves have large crowns
Thick leaf litter
Brown earth soil

91
Q

Stratification in deciduous woodland?

A

Oak, ash and chestnut trees
Rowan, holly and hazel- shrub layer
Brambles, bracken and flowering plants e.g.- bluebells - field layer
Mosses and lichens- ground layer

92
Q

Describe brown earth soil?

A

Deep, well drained, fertile, and support and large amount of fauna

93
Q

Example of deciduous woodland?

A

Hayley wood in Cambridgeshire

94
Q

Why is brown earth soil ideal for growth?

A

Decomposes break down leaf litter to rich, dark brown humus
Slightly acidic
Earthworms and rodents mix the layers to aerate the soil- prevent leaching and water logging

95
Q

What is a plagioclimax

A

When succession is disturbed by human intervention, preventing climatic climax

96
Q

Where are the heather moorlands?

A

North Yorkshire

97
Q

History of Heather Moorlands?

A

Three thousand years ago was the climatic climax.
Woodland cleared for farming and soils deteriorated.
The efficient nutrient cycle was distorted and ground was exposed to heavy rainfall.

98
Q

What happened after woodland was cleared?

A

Soils were left eroded and leached of its nutrients.

Resulting in thin, less fertile, peaty podsols

99
Q

What was the result of podsolization?

A

Hardy plants colonised upland areas- grass, bracken and heather (mixed moorland vegetation)

100
Q

Describe heather?

A

A valuable, evergreen forage plant. Major food douse for hill sheep. Staple diet of red grouse.

101
Q

What are the 4 heather phases?

A

Pioneer phase
Building phase - most productive
Mature phase
Degenerate phase

102
Q

How and why is the heather burnt?

A

In a 10-15 year rotation in areas of 1 hectare at a time.

Controlled burning is to keep heather in its building phase

103
Q

What would happen if the burning stopped?

A

Secondary succession l

Scrub and birch followed by climax community

104
Q

How much sunlight gets to the forest floor in the rainforest?

A

As little as 1%

105
Q

Adaptations of plants on the forest floor?

A

Large flat leaves

106
Q

Adaptation of Mimoca Pudisa

A

Folds its leaves inwards or droops when leaves surface is contacted

107
Q

How are the canopy leaves adapted?

A

Approx 80% have Drip tip leaves- sheds water quickly

108
Q

Example of symbiotic relationship?

A

Epiphylls growing in puddles on leaves surface, steeling sunlight

109
Q

Example of sustainable tourism?

A

Loss of 80% orang-Utan habitat in 20 years.

Sepilok Rehabilitation centre- 1964

110
Q

Background to oil spill?

A

2010 Deepwater Horizon Oil rig disaster in the Gulf of Mexico
Worlds largest accidental oil spill

111
Q

Environmental consequences of oil spill?

Economic?

A

48km plume of oil
Impact on food webs
Marshland ecosystems covered in black poisonous sludge

80% of jobs in fishing and tourism threatened

112
Q

Oil clean up?

A

Pom-poms- collected oil around rocky areas
Containment booms- trapped oil by sticking to booms
Natural processes- weathering and tidal action
3/4 of spill removed

113
Q

Which species did the oil threaten?

A 
Coral reefs 
Marshlands and coastal grassland 
Black mangroves
Turtle species- 500 dead 
Blue fin tuna
114
Q

The Antarctic Treaty?

A

1959

Twelve nations signed

115
Q

Figure on tourism to Antarctica?

A

Tripled in last 20 years

116
Q

Endangered fish?

A

Patagonian toothfish

117
Q

Which cities are at threat from rising sea levels?

A

New York and Venice

118
Q

Waste differences between developed and developing countries?

A

Developed produce 30 times more waste

A2 GEOGRAPHY (3 decks)

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