An exciting diversion from the plant kingdom came our way recently thanks to ANGAIR member Rebecca Hosking who had found a colony of Buoy Barnacles, Dosima fascicularis, washed up on Fairhaven Beach earlier in the year. 

Buoy BarnacleBuoy Barnacle

After an initial examination of this fascinating aggregation of crustaceans, we placed dissected sections of the float under the microscope and were not surprised to see a structure resembling expanded polystyrene foam. This is the only barnacle species which produces its own gas-filled float (thought to be carbon dioxide), one float sometimes forming aggregations of many individuals, as we observed.

Buoy Barnacle floatBuoy Barnacle float

 

It is interesting to note that the Buoy Barnacles are not reliant on producing their own float, they can also attach themselves to both non-living and living matter found in the ocean, for example plastic, driftwood or seaweed, as well as turtles and sea snakes.

Ref. https://en.wikipedia.org>wiki>Dosima.

Gail Slykhuis

Events Calendar

Oct
16

Tue 10:00am - 3:00pm

Oct
20

Sat 10:00am - 2:30pm

Oct
22

Mon 9:30am - 11:00am

Oct
22

Mon 11:00am - 1:00pm

Weed of the month

Freesia

Freesia

Freesia refracta and Freesia alba X F. leichtlinii are declared weeds in the Surf Coast Shire because they spread easily and threaten to invade bushland. Freesias are perennial herbs that die back in summer and produce new foliage in winter. The highly fragrant trumpet-shaped flowers appearing in spring are white to cream and pink with yellow markings, shaded purple on outer surface. Each plant has at least two corms, one below the other, thus requiring deep digging to remove them.

More details about how to control this weed can be found in the archive of Weeds of the Month.

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