TIDAL ZONES HIGHEST SPLASH ZONE Darkened rock Verrucaria: lichen – Fungus store water – Photosynthetic algae Calothrix: blue/green algae – Dark.

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Presentation transcript:

TIDAL ZONES

HIGHEST SPLASH ZONE Darkened rock Verrucaria: lichen – Fungus store water – Photosynthetic algae Calothrix: blue/green algae – Dark green mat – Jelly like layer – Nitrogen fixation for nitrates

UPPER INTERTIDAL/LITTORAL ZONE What factors? Euryhaline: wide range of salinities

Gastropods Stomach Foot

Dominant species: Littorina (periwinkles) Operculum Radula

TIDE POOLS Microcommunities Large fluctuations Enteromorpha: green tubular, fronds, high rate of photosynthesis

MIDDLE INTERTIDAL Dominant upper: barnacles Dominant mid: Fucus Dominant lower: Mytilis

Competition for space Predation & control on lesser species

Barnacles (Balanus) Avoids lower zones due to predators (seastar, dog whelk) and competes with seaweeds Cementum Live close together Closed by plates (what is the purpose?) What is the purpose of the shape? Suspension feeders: plankton & detritus Cirri (6 pairs)

Video of barnacles feeding NtbypUhttps:// NtbypU

Brown Seaweed (Fucus) Thick/dense to retain moisture Symbiotic with crabs, sea slugs, snails, isopods, seastars Softens waves for others

Substrate: what it attaches to

Substrate Holdfast

What are the air bladders for?

Mytilus Zone Byssal threads (beard): secreted from gland, regenerate Streamlined to decrease friction Close tight to prevent dessication/predation Predators: seastars, crabs, predatory snails, birds (lowest zones only)

Mytilus Zone Broadcasting fertilization Larvae

Slipper Snails (Crepidula) Gastropod Filter feeders Muscular foot Change sexes

Competition for space Limiting factors is space, NOT food Most are sessile If your 1 st to a new area: effective dispersal by larvae Colonize on top of others or loosen others –Suseptible to waves, smothering or lack of light.

What stressors affect the critters?

Competition Most are sessile Colonize on top of others or loosen others Light

Limiting factors is space, NOT food