These lecture notes are the sixth in a series from the module biodiversity: exploiters and exploited. This lecture covers everything about barnacles and biofouling from their lifecycle to their impacts. A great way to start your understanding in this module (or help you get out of the lecture).
Sessile (fixed and immobile), instars (moulting stages), antennules (small first pair of antennae),
biramous limb (limb that branches into two from one), carapace (hard shell of a
crustacean/tortoise), bivalve carapace (2 shell pieces bound by a muscular hinge), quorum sensing
(gene expression reg by fluctuations in cell-pop density)
Barnacles
o Sessile & speciose (less so than insects)
o 60% live on rocks and 33% parasitic
o Subphylum = Crustacea
o Class = Cirripedia (900 species)
o Grow on structures (biofouling)
o Limpet camouflage (snails with wide cone-like shells)
Staled barnacles
o Lepas sps
o Found on sailing ships bc cannot handle higher speeds
Life cycle
o Pelagic stage
Nauplius stage
One eye (swims w/antennae)
Brings food towards mouth (mandible)
Antennules
6 instars (1mm after 6th moult)
Biramous limb
Carapace (keratinous)
Cyprid stage
Doesn’t feed
Binds to object
o Initially by sticking pair of antennules to surface
o Releases oxidative fluid – clean surface
o Then sticks by glue ducts/cement glands (resistant to
chemical breakdown)
Used in dentistry to repair BVs/nerves
o Factors
Water currents, surface texture, current and
chemical composition
Bivalve carapace
6 pairs of thoracic limbs
3-4 weeks to settle or cannot
metamorphose
o Metamorphasis
Flexation occurs
Primordial plate appears
o Adult barnacle
Loves 2-6 years
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