2-8 Rocky Subtidal

2-8 Rocky Subtidal - ROCKYSUBTIDAL Topic13...

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ROCKY SUBTIDAL Topic 13 Chapter 5, pages 214-233 Kelp forests and beds Subtidal rocky reefs Artificial reefs
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ROCKY SUBTIDAL From the intertidal/subtidal boundary to about 200  m Hard bottoms, including bedrock, boulder fields,  cobble, and rock walls May be vertical, horizontal or overhanging Common but not omnipresent habitat not found in the GOM
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Epifauna and epiflora Attached plants and animals Many are clonal or vegetative reproducers  Others reproduce sexually
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Slope dictates community in shallow water: Horizontal or gentle slope (with light) leafy macroalgae (kelp) dominant, although inverts  present  sea urchins graze kelp Vertical or steep slope sessile inverts (suspension-feeding bryozoans,  ascidians, branchiopods, sponges, soft corals and  predaceous anemones) dominant with little leafy  macroalgae
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Figure 5.17
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Qualifiers: Differences between walls and floor are less  pronounced at depths > 30 m, where light begins to  limit algae Tropics have few kelps so not as great a difference  between walls and floor
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Cold-water corals More common than previously  thought in deep water Threat from trawling
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2-8 Rocky Subtidal - ROCKYSUBTIDAL Topic13...

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