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

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Presentation on theme: "TIDAL ZONES HIGHEST SPLASH ZONE Darkened rock Verrucaria: lichen – Fungus store water – Photosynthetic algae Calothrix: blue/green algae – Dark."— Presentation transcript:

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3 TIDAL ZONES

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7 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

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

9 Gastropods Stomach Foot

10 Dominant species: Littorina (periwinkles) Operculum Radula

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

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

13 Competition for space Predation & control on lesser species

14 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)

15 Video of barnacles feeding https://www.youtube.com/watch?v=66p3e NtbypUhttps://www.youtube.com/watch?v=66p3e NtbypU

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

18 Substrate: what it attaches to

19 Substrate Holdfast

20 What are the air bladders for?

21 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)

22 Mytilus Zone Broadcasting fertilization Larvae

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

24 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.

25 What stressors affect the critters?

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

27 Limiting factors is space, NOT food

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