BIO 469 Lecture Notes - Lecture 17: Transect, Invertebrate, Desiccation
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13 Jun 2018
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Rocky Shores
● What is the Littoral Zone?
○ The zone between high- and low-tide that is present on any shoreline
○ Intertidal - extreme low tide to extreme high tide ( the SPRING tides)
○ A full gradient of environments between fully terrestrial and fully marine
○ Waves and spray
● Rocky Coasts (S and N shore)
○ Very exposed to waves, mostly attached organisms like barnacles, limpets and
snails
● Mudflats (St. David’s, Spanish Point)
○ Low energy environment
○ Burrowing animals, such as clams, worms
○ Wading birds
● Mangroves (Hungry Bay, Riddell's Bay, Foot of the Lane)
○ Low energy environment
○ Burrowing animals, ghost crabs, hermit crabs, sponges and algae attached to the
mangrove roots
In all these habitats, at high tide, fish move in to feed and then they retreat when the tide falls
● Environmental variation on the intertidal shore
○ Vary from low to high tide levels ( within a vertical transect - spatial)
○ Vary from location to location (between transects, horizontal - spatial)
○ Vary seasonally (temporal)
○ Vary over the tide cycle (temporal)
● Variable conditions on the shore
○ Wet to dry
○ Submersion/emersion
○ Cool to hot
○ Hypersaline to freshwater
○ Wave energy
○ Predation and competition
● Zonation
○ Occurrence of dominant species in distinct, horizontal bands (patterns that we
see)
■ Physical
■ Physiological
■ Biological interactions
● What causes zonal distributions?
○ Physical factors
■ Wave action - high energy wave impacts
■ Temperature & dryness
○ Physiological factors
■ Desiccation
■ Oxygen uptake
■ Feeding behavior
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Document Summary
The zone between high- and low-tide that is present on any shoreline. Intertidal - extreme low tide to extreme high tide ( the spring tides) A full gradient of environments between fully terrestrial and fully marine. Very exposed to waves, mostly attached organisms like barnacles, limpets and snails. Mangroves (hungry bay, riddell"s bay, foot of the lane) Burrowing animals, ghost crabs, hermit crabs, sponges and algae attached to the mangrove roots. In all these habitats, at high tide, fish move in to feed and then they retreat when the tide falls. Vary from low to high tide levels ( within a vertical transect - spatial) Vary from location to location (between transects, horizontal - spatial) Occurrence of dominant species in distinct, horizontal bands (patterns that we. Wave action - high energy wave impacts. Remaining within the zone of survival - resisting drag. Structural tactics - thread, other secretions, spines, suckers and adhesive feet, home sites (scars)
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