Seed Dispersal and Soil Terms
Terms in this set (24)
Seeds dispersed by gravity
plant carries out its own seed dispersal
seeds are dispersed by some type of vector
Seeds dispersed through ballistics, ie pod explosions
Seeds dispersed by wind
Seeds dispersed by water
Seeds dispersed by animals
Seeds dispersed by ants specifically
Seeds dispersed by birds specifically
Seeds dispersed by humans
An animal adapted to eating grains and seeds; examples include squirrels, voles, and many bird species.
the part of the plant that gets dispersed, usually contains the seed(s)
Shiny, oil-containing, ant-attracting tissue on the seed coats of many plants.
functions of seeds
1. Reproduction, an increase in numbers
2. Dispersal, colonization & new populations
3. Feed embryo
4. Protect embryo
5. Dormancy, avoid bad seasons, persistence
6. Genetic diversity introduced
•Diaspores are decorative, but also have important ecological functions.
•Seeds advance site sustainability, through bad and changing times.
•Seeds on site can enrich other areas through dispersal.
distance a seed can fall from its source
Soil is where we grow our crops.
Soil supports primary production in terrestrial
Soils are used as engineering media.
Soils regulate movement of water.
Soil is where we dump our waste.
Soils are a fragile resource that may take centuries to recover from damage.
The outermost layer of the Earth that is composed of soil.
a measure of how well the soil supports plant growth
biotic components of soil
• Bacteria • Actinomycetes • Fungi • Algae • Protozoa • Nematodes • Enchytraeids • Earthworms • Arthropods
live in or near the surface, eat mostly litter, by doing this stimulate the activity of microorganisms.
live in upper soil layers, eat mostly soil, burrows allow for plant roots to grow and increase infiltration.
problems with urban soil
• Variable • Compaction • Hydrophobic crust • Elevated pH • Restricted aeration and water drainage • Nutrient cycling and soil organisms • Chemical pollution • Higher soil temperature
A mutualistic association of plant roots and fungus
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