Tag Archives: ForBio

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Good-bye Greenland!

The last days before leaving the Arctic Station were busy: last boat trip, last samples, last possibility for filming work with the underwater-camera. Personal projects to finish, lab to clean, things to pack, and on top of all that: a football match against the Qeqertarsuaq “Old Boys”!

Photo: A Mucharin   Photo: A AltenburgerLast days in the lab: full house!                         The underwater film team: Mette and Jenny

Photo: I Meyer-Wachsmuth

Bathing between icebergs – who can resist?

Photo: A Mucharin

Football match against the Qeqertarsuaq “Old boys”, who turned out to be not that old… and pretty fit!

We left the Arctic station on a beautiful sunny day and headed towards Ilulissat, where we spent two days in wait for our flights back to first Kangerlussuaq and then Copenhagen. And beautiful days that was: Ilulissat is known for its icebergs and some of us took an icefjord tour on a handsome, oldish, boat with red paint and wooden deck. And – to our surprise – it turned to be out the old Porsild – the Arctic Station’s former research vessel!

Photo: D de Abreu

On the way to the ice fjord in Ilulissat – on board of the boat that turned out to be the Arctic Station’s former research vessel (the “old” Porsild!).

Now we are back to our respective homes – wrapping up coursework and getting on with our lives, PhD projects, master theses, scientific work and teaching. But we all agree: this was a very special course bringing us close to Arctic nature and providing us with outstanding possibilities to collect and study Arctic marine organisms.  We could both widen our taxonomic knowledge and – in different degrees – even get data that are of direct use for our ongoing research projects.

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At the end of this blog, we want to thank all those who helped us during this trip: Ole Stecher and Akaaraq Mølgaard at the Arctic Station, the crew of RV Porsild: skipper Frederik Grønvold and boatmen Søren and Johannes. Also, we are thankful to Reinhard Møberg Kristensen (Univ. Copenhagen) for suggestions concerning sampling sites and use of equipment!

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The Research School in Biosystematics (ForBio) is funded by the Research Council of Norway and by the Norwegian Taxonomy Initiative – thanks for making a course like this possible!

And thanks to all of you who have been following us via this blog!

Written by: Christiane Todt (coordinator ForBio, University Museum of Bergen);                   Featured image: (Jenny) under the rainbow. Photo: Anne-Helene Tandberg

 

Photo: MHEilertsen & H Flørenes

Calcareous sponges of Disko Bay

Fifteen species of calcareous sponges (phylym Porifera, class Calcarea) are known from the Disko Bay area, and nine of these have their type locality here, which means that this was the area they were fist described from. During this fieldtrip we wanted to collect calcareous sponges from Disko to get material that can be used for genetic studies to investigate the relationships between the populations in Disko Bay and populations of what is believed to be the same species in other localities.

Photo: MHEilertsen & H Flørenes

Photo: MHEilertsen & H Flørenes

Spicules from Brattegardia nanseni.

Photo: MHEilertsen & H Flørenes

Largest calcareous sponge found during this fieldtrip.

Identifying calcareous sponges is not a straightforward business; first of all they are very small (most < 1 cm), and secondly they do not have any obvious external characters like bright colours, legs or even a head. In stead they have spicules. Spicules are small needle-like structures that function as the skeleton of the sponges, and in calcareous sponges they are made out of calcium carbonate. The shape of the spicules is an important character to identify sponges, in addition to the morphology of the sponge body and the arrangement of different types of cells. To look at the spicules of the sponges we need to clean the spicules from tissue and mount them on microscope slides. We cut out a piece of the sponge and add household bleach, which is left to work for 30 minutes, followed by three rounds of cleaning with distilled water, each taking 30 minutes. To make a permanent slide that we can look at again and again we use an imbedding medium that takes about 24 hours to dry sufficiently, so the time between we find a sponge specimen until we can identify it can be quite long.

Photo: MHEilertsen & H Flørenes

Collection of sponges fixated on ethanol.

We have had quite good sampling success so far, with over 50 specimens of calcareous sponges, and a few sponges of other classes. Most of the specimens were found sitting inside globular aggregations of Lithothamnion, a red algae (described in an earlier blogpost). Getting the sponges out from the Lithothamnion was tricky, both because they are very small and hard to spot, and because they were sitting quite far inside the globules, probably to get shelter. We also got many specimens from a triangular dredge sample that was sieved through a 1mm sieve. This is also where we found our largest specimen so far on this course! A beautiful Leucandra penicillata with a length of a whopping 5 cm! The calcareous sponges we have identified belong to at least eight different species, but the material has to be examined by experts to be certain of the identification.

Not all the samples we collect are equally interesting, but ones in a blue moon something special comes along. Yesterday, while sorting through the material from the dredge, we realized that we had just found the remnants of our good friend Spongebob Squarepants! It was a sad day indeed as we sieved out our global mascot from the murky waters. A memorial was thrown in his honour with the Greenlandic flag on half a pole. But life goes on and so does the search for new exciting sponges in different parts of the world!

Photo: Daniela de Abreu

Oh no – Sponge Bob is dead!!

By Henning and Mari (University of Bergen).

Featured image: Variety of calcareous sponges from Disko