Factors affecting Rocky Intertidal Zonation Patterns. Intertidal Zones Immersion in seawater Emmersion in Air Tidal Patterns Biobands of intertidal algae and Animals Diversity determined in part by the presence of a keystone predator
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Rockweed or Fucus (FUC)
Soft Brown Kelps (SBR)
Green Algae (ULV)
Red Algae (RED)
Nearshore Patterns - Biobands
Biobands are species assemblages with a characteristic color and across-shore elevation.
5. Predation and competition
Figures 6.16, 6.17
therefore, distribution is not due to larval settlement patterns but post-settlement mortality
Transplant experiments suggest that Balanus cannot withstand physical stress in the upper intertidal
transplanted barnacles die due to temperature or desiccation stress
If Chthamalus transplanted down and Balanus is not removed, Balanus overgrows and kills Chthamalus
Chthamalus experiences a refuge from Balanus above Balanus’ distributional range
Balanus is the superior competitor for space and competition sets the lower distributional limit for Chthamalus
Disturbance is greatest in the lower intertidal
waves sweep away or logs crush sessile animals
the frequency of disturbance events may dictate species composition
disturbance increases diversity
No cage, control
No cage, control
Quiz 10: Are barnacles controlled by predation,
competition or physical factors?