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Beachcombing. Maia McGuire, PhD Sea Grant Extension Agent. Beach zones. Dune Berm/backshore Wrack line/strand line Foreshore Swash zone Nearshore/breaker zone Offshore. High tide I I Low tide Subtidal. Backshore. Ghost crabs. Wrack line.

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beachcombing

Beachcombing

Maia McGuire, PhD

Sea Grant Extension Agent

beach zones
Beach zones
  • Dune
  • Berm/backshore
    • Wrack line/strand line
  • Foreshore
    • Swash zone
  • Nearshore/breaker zone
  • Offshore

High tide

I

I

Low tide

Subtidal

backshore
Backshore
  • Ghost crabs
wrack line
Wrack line
  • Often created during storm events
  • Seaweed, debris
  • Amphipods (beach hoppers)
  • Sea beans, seashells
  • Other “treasures”
sea beans
Sea beans
  • www.seabean.com
  • Any of a number of seeds that are adapted to germinate even after spending a period of time floating in water
  • Mostly from tropical plants, many from vines
seashells
Seashells
  • Phylum Mollusca
  • Class Gastropoda
  • Classes Monoplacophora, Polyplacophora (primitive)
  • Class Bivalvia
  • Class Scaphopoda (tusk shells)
  • Class Cephalopoda
mollusks
Mollusks
  • Generally have muscular foot, calcareous shell secreted by the mantle, feeding organ called radula
  • Larvae are often planktonic veligers

www.pbs.org

www.seaslugforum.net

gastropods
Gastropods
  • “Snails”
  • Head with eyes on tentacles
  • Usually relatively active/mobile
  • Usually coiled shell into which animal can retreat
  • Includes sea slugs
  • Grazers or predators
slide9

Egg collar

Moon snail (“shark’s eye”)

Operculum (“trap door”)

bivalves
Bivalves
  • Shell has 2 (hinged) valves
  • Adapted to burrow in soft sediments
  • Most are filter-feeders
  • May be attached (cement, byssal threads), burrowers/borers or free swimming
cephalopods
Cephalopods
  • Octopus, Squid, Cuttlefish, Nautilus, Spirula

www.manandmollusc.net

crab shells
Crab shells
  • Moult or dead? (i.e. will it stink when I get it home?)
  • Male or female?
sea stars

Margined Sea Star

Astropectenarticulatus

Sea Stars

Common Sea Star

Asterias forbesi?

jellyfish
Jellyfish

www.enature.com

  • Portuguese man-o-war
    • Don’t touch!
    • Associated companions—”By-the-wind sailor”, “blue buttons”, purple sea snail, man-o-war slug, man-o-war fish

www.amonline.net.au

cannonball jellyfish
Cannonball jellyfish

www.jaxshells.org

moon jellyfish
Moon jellyfish

www.jaxshells.org

live critters
Live critters
  • Coquinas
  • Augers
  • Mole crabs

www.jaxshells.com

marine debris
Marine Debris
  • PLASTICS!!!
slide32
Sand

To see a world in a grain of sandand a heaven in a wildflower,hold infinity in the palm of your handand eternity in an hour.William Blake

where does sand come from
Where does sand come from?
  • Erosion of rocks (on land)
    • NE Florida sand is silica-based; comes mostly from mountains of NC
  • Formed by marine plants/animals
    • Shells, sea urchins, etc.
    • Corals
    • Calcareous algae (macro- and microscopic)
sand colors
Sand colors

http://www.paccd.cc.ca.us/instadmn/physcidv/geol_dp/dndougla/SAND/SANDHP.htm