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12 terms

oceanography 23

land margin ecosystems
STUDY
PLAY
general features of land margin ecosystem
land meets water
sharp gradients
give rise to zonation
5 examples of LME
Estuaries, seagrass beds, salt marsh and mangroves, Rocky shores, Sandy shores
Estuary
semi-enclosed coastal body of water has free connection with the open sea and within which sea water is measurably dilued with freshwater derived from land drainage
birth and death of esutary
birth- sea levels rise and drowns low lying valleys near the sea
Death- filled with sediment and without sea-level rise
Estuarine circulation
salt wedge
partially mixed
well-mixed
seagrass
macrophytes (big plants) and submerged aquatic vegetation
not true plants and not kelp
Salt marsh
salt marshes are beds of intertidal rotted vegetation which are alternately inundated and drained by the tides
requirements for salt marsh and mangroves
protected shores with fine sediment
salt water
tides
temperature - marshes temperate
- mangroves tropical
Mangrove
ecological equivalent of salt marshes in tropical areas.
contains trees adapted to saline water
Rocky shore
supports a diverse and conspicuous assemblage of invertebrates and luxuriant macroalgal growth that produce more organic material than almost any other intertidal habitat
Rocky shore zones
splash zone
high
mid
low
3 main types of barriers
pebbles
sandy
sandy/mud