Ecosystems - (P1-SEC B) Flashcards
DEFINITION
ECOSYSTEMS
- system in which organisms inetrcat with eachother/with their environment
define
abiotic
- non living things
- e.g air, water, heat
define
Biotic and 2 types ?
living things
e.g animals , plants
FLORA : plant life occuring in a partiuclar region/time
FAUNA: animal life of any particular region/time
3 features of a food chain?
Producers: convert energy from environ into sugars
Consumers: GET ENERGY FROM SUGARS from producers
Decomposers: Breaks down plant/animal material and return nutrients into soil
difference between food chain and food web?
Food chain- SHOW DIRECT LINKS BETWEEN PRODUCERS/CONSUMERS IN A SIMPLE LINE
Food web : SHOW ALL CONNECTIONS BETWEEN PRODUCERS/CONSUMERS IN A COMPLEX WAY
What is nutrient cycling?
decomposers help recycle nutrients making them availabe again for growth of plants/animals
1. producers take up nutrients from soil for growth
2. consumers eat producers using nutrients fro growth
3. decomposers break down organic matter (when consumer dies) and return nutrients to soil
changes of ecosystems due to HUMANS?
- EUTROPHICATION from fertilisers (fish die due to lack of 02)
- ponds are DRAINED for farming (less habitats)
- WOODS cut
- Hedgerows removed to increase field size (less habitats)
cause of variations in vegetation?
- ocean currents
- wind
- distrubution of land/sea
location, characteristics
Desert
Location : 30 N/S equator
characteristics : high temp (day), low temp (night), high pressure, low rainfall
location, characteristics
Polar
location: Arctic/antarctic
characteristics: cold air sinks at Poles
- very low temps / DRY
location, characteristics
Deciduous/confierous forest
location: 50-60 North of equator
characteristics: Deciduous shed leaves in winter to retain moisture
- conferous retain leaves in summer
location, characteristics
Temperate grassland
location: 30-40 N/S equator
characteristics: - warm, dry summer
- cold winter
location, characteristics
Mediteranean
location: 40-45 North Equator
characteristics : hot, dry summer
-mild winter
location, characteristics
Tropical Grassland
location: 15-30 N/S equator
characteristics: Dry season , hot (fires)
- thunderstorms in wet season
location, characteristics
Tundra
location: from arctic cirle to 60-70 north
characteristics : low growing plants retain heat
- cold windy dry