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Ecosystems
- What is an ecosystem
- Natural system in a geographical area where plants, animals, landscape and climate all interrelate
- Biotic: living things . Abiotic:
Non living things EG. climate
- small scale ecosystem examples:
freshwater pond, hedgerow, rockery
- Natural system in a geographical area where plants, animals, landscape and climate all interrelate
- freshwater pond
- Producers,consumers,decomposers,food chain (link
between producers and consumers as a line diagram,food
web (more complex link between producers and consumers
- nutrients cycling:
sources are
rainwater,
weathered rock
and decomposers
- pond margin: plenty of oxygen and light, shelter for plants and
insects small mammal's food source. reeds and bull rushes
- Pond surface: plenty of oxygen and light, habitat
for insects such as water boatmen and larger
mammals such a duck and geese
- Mid water: animal breathe though
gills or skin. Habitat for underwater
plants. Fish are the main predators
- Pond bottom: Little oxygen and light. Plenty of
shelter. decomposers and scavengers live here.
- Pond bottom: Little oxygen and light. Plenty of
shelter. decomposers and scavengers live here.
- Mid water: animal breathe though
gills or skin. Habitat for underwater
plants. Fish are the main predators
- Pond surface: plenty of oxygen and light, habitat
for insects such as water boatmen and larger
mammals such a duck and geese
- Producers,consumers,decomposers,food chain (link
between producers and consumers as a line diagram,food
web (more complex link between producers and consumers
- case study: Avington park lake, Winchester
- Country estate. Lack of
maintenance = accumulation of
silt and plants. Positive result =
excellent habitat. Negative:
imbalanced ecosystem
- 2014 restoration: Desilting the lake to provide
better waterside habitat (for nesting birds) and
improved the oxygenation of the water
(encouraged diversity of plants and animals)
- Country estate. Lack of
maintenance = accumulation of
silt and plants. Positive result =
excellent habitat. Negative:
imbalanced ecosystem
- How does change effect ecosystems
- Global change: hotter climates, extreme weather (drought etc.)
- human activity: use of fertilisers, change of
pH in water, adding of different species.
draining of ponds for agriculture use.
cutting down plants or trees at pond margin
- Global change: hotter climates, extreme weather (drought etc.)
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