04 Coastal Habitats

04 Coastal Habitats - COASTAL HABITATS Many species or...

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COASTAL HABITATS ± Many species or life-history stages are distributed in or move between several of the following habitat types (that are defined by biologists, not fishes) ± Habitat type depends in part on exposure to wave energy, currents, and tides ± Coastal habitats range across an expanse from intertidal pools to the edge of the continental shelf Coastal Habitat Types Rocky Intertidal Exposed Beaches Mudflats Salt Marshes Mangrove Swamps Seagrass Flats Kelp Beds Near-shore Rocky Bottoms Near-shore Soft Bottoms Variation in Tidal Ranges and Types Rocky Intertidal ± Harsh environments with diverse fish faunas. ± A gradient of severity from higher intertidal to lower intertidal. ± True residents highly specialized, many lack swimbladder and scales. Have sucking discs and flattened bodies. ± Partial residents are juveniles of larger spp found in deeper water. Rocky Intertidal. .. ± Tidal visitors move in and out with tide to feed. ± Seasonal visitors , a few are spawners, most are transients. ± Tolerance of abiotic conditions is more important in the upper intertidal. ± Species interactions are more important in the lower intertidal. Rocky Intertidal. .. ± Preferences and tolerances lead to a succession of species, but not the strong zonation sometimes apparent for invertebrates. ± Fish communities are fairly deterministic in structure. ± Persistent through time, but in contrast to inverts and plankton which are more stochastic . ± Experiments (as in Tropical Reefs).
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Rocky Intertidal. .. ± Scales of space, time, and magnitude may influence results of natural and experimental perturbations ± Many intertidal fishes have pelagic larvae with strong substrate preferences that quickly set up and defend territories once they settle--they also have a strong homing ability if displaced. Rocky Shore and adjacent Sandy Beach
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04 Coastal Habitats - COASTAL HABITATS Many species or...

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