Between the Tides

Schedule

• January 11 Introduction, Sponges, Jellies and Anemones

• January 18 Inter-tidal Pools – Harling Point / Trafalgar Park

• 0.3 M tide at 20:30• January 25 Flat Worms and Worms

with Legs

Schedule

• February 1 Chitons, Limpets and Snails

• February 8 Clams and Octopus• February 15 Inter-tidal Pools –

Smugglers Cove. 0.5 M tide at 19:30

• February 22 Animals that are moss like, clam like, worm like but are not

Schedule

• March 1 Crabs of all kinds• March 8 Sea Stars, Sea Urchins

and Sea Cucumbers• March 15 Inter-tidal Pools – Clover

Point. 0.8 M tide at 19:00

What to Bring Inter-tidalling

• Rubber Boots• Wear warm clothes and bring an extra pair of socks just

in case• Rain jacket and rain pants (if you have them). Some ski

pants work well also• Hat and gloves• Flash light and head lamp (if you have one)• Bucket or pail with a lid (e.g. ice cream buckets with a

handle)• Camera (but remember there is a good chance it may

get wet)

The SpongesPhylum Porifera

The Sponges: Phylum Porifera

e.g. Haliclona sp

• Multicellular• No tissues• Sessile • Filter feeders

The Sponges: Phylum Porifera

• Characterized by their spicules– Calcium– Spongin– silica

The Sponges: Phylum Porifera Filter Feeders

Filtering Barrel and Chimney Sponges.flv

The Sponges: Phylum Porifera

Sessile?

Not Always

Thanks to their symbiotic friend the Hermit crab

The Sponges: Phylum PoriferaSponges: defense

• many sponges produce toxins and have bright warning colouration

• some sponge toxins work against other sponges competing for space

The Sponges: Phylum Porifera

The Sponges: Phylum Porifera

• Glass Sponge Reefs

The Sponges: Phylum Porifera Our Reefs

Sea Anemone and JelliesPhylum Cnidaria

Sea Anemone and JelliesPhylum Cnidaria

Sea Anemone and Jellies - Phylum CnidariaClass Scyphozoa

Sea Anemone and Jellies - Phylum CnidariaClass Scyphozoa

Sea Anemone and Jellies - Phylum CnidariaClass Scyphozoa

Alternations of Generations

Sea Anemone and Jellies - Phylum Cnidaria Class Hydrozoa

Sea Anemone and Jellies - Phylum Cnidaria Class Hydrozoa

Sea Anemone and Jellies - Phylum Cnidaria

Sea Anemone and Jellies - Phylum Cnidaria Class Anthozoa

• Jellies not present during their lifecycle

• Have stinging cells called nematocysts

• Carnivores• Can move on their

pedal foot and some can swim.

• Corals also found within this class

Anemone Reproduction

Sea Anemone and Jellies - Phylum Cnidaria

Class AnthozoaSplitting Anemone

Sea Anemone and Jellies - Phylum Cnidaria

Class AnthozoaSwimming Anemone