Category Archives: Norwegian Taxonomy Initiative

Some hydroids, four naturalists, and a small island in the North Sea

NorHydro partner (and hydrozoan expert) Joan J. Soto Àngel from the Sars International Centre for Marine Molecular Biology went in a sampling trip to Kinn to collect benthic hydroids. Here is an account of his experience in this trip:

Kinn is a small grassy island on the western Norwegian coast. Today it is a quiet, peaceful place with only a few inhabitants, but in the past it was an important fishing town and the center of the cultural and religious life of the area, as evidenced by its imposing medieval stone church (Kinnakyrkja). The island is also a place of historical relevance for biologists, since it is intimately tied to the life and discoveries of one of the most prominent naturalists of the XIX century, Michael Sars, who worked as a priest in Kinnakyrkja for many years.

Here I am, ready to sample! The island behind is Kinn, easy to recognize thanks to its characteristic cleft silhouette. Picture: Cessa Rauch

The islands in the area face the ocean and are rather exposed, so the vegetation is not particularly tall, but the waters are teeming with life. Picture: Joan J. Soto

The XIX century Norwegian naturalist Michael Sars. Picture from Wikicommons (public domain)

Sars described many species inhabiting the waters around Kinn and also made key observations about their distribution and life cycle. Indeed, he was the first to discover that jellyfish and polyps are in fact different stages of the same animals!

This finding led him to be recognized as an outstanding zoologist of his time. Even now, ca 200 years after, his extensive work is regularly consulted by researchers of many fields. Like me and the other participants of the Artsdatabanken project NorHydro, Sars was fascinated by the group we call Hydrozoa, which is why it was very interesting for our project to join a sampling trip of the University Museum of Bergen in the same waters where he sampled and described many hydroids, hydromedusae and siphonophores.

Because Sars was also interested in other critters of the sea besides hydrozoans, it was only natural to make this sampling trip a joint, collaborative effort. In our case, three marine scientists were involved, each representing a different project: I was in charge of the hydrozoans for NorHydro, while Anne Helene Solberg Tandberg focused on amphipods (NorAmph2) and Cessa Rauch concentrated on sea slugs (Sea Slugs of Southern Norway). But we did not limit ourselves to our favorite animal groups; we also sampled some poychaetes, bryozoans, ascidians and echinoderms for two other projects based at UMB, Hardbunnsfauna and AnDeepNor. In addition, while we sampled extensively the waters around Kinn, we also stopped in the way to the island and back and collected some animals in two other localities in the coast of Sogn og Fjordane. Our efforts paid off and, despite some windy weather, we came home with many specimens to analyze and samples to sort.

Three more contemporary naturalists working for different projects: Joan (left, NorHydro), Cessa (middle, Sea Slugs of Southern Norway), and Anne Helene (right, NorAmph2). Picture: Joan J. Soto

For the hydrozoans, the majority of samples consisted in colonies of hydroids belonging to the families Sertulariidae, Haleciidae and Campanulariidae. This was not surprising as Sertulariidae (sensu lato) is the largest and most diverse family in all Hydrozoa, and their conspicuous colonies are relatively easy to recognize and collect. The haleciids are represented in Norway mainly by species of Halecium, whose colonies are among the largest benthic hydrozoans of the country. As for the campanulariids, particularly those belonging to genera Obelia, Laomedea and Clytia, they are common inhabitants of rocky and mixed bottoms all around the world, and are especially conspicuous when growing on macroalgae such as kelp. To correctly identify some of these specimens, we will look closely at their morphological characteristics and will also employ molecular techniques of DNA analysis. Hopefully this approach will help us understand the diversity of benthic hydroids living around Kinn, and will allow us to determine whether the species that we encountered are the same that Sars studied.

Dynamena pumila was one of the most conspicuous species of hydroid that we collected in this trip. It belongs to the speciose family Sertulariidae.

We were very lucky to have the help of the crew of RV Hans Brattström. This is how the command center of the boat looks like!

You’ll find the results of these and other NorHydro’s analyses here in the blog as we progress, and more updates on the project can be found on the Hydrozoan Science facebook page and in Twitter with the hashtag #NorHydro.

– Joan


References and related literature about Michael Sars

Tandberg AHS, L Martell (2018) En uimodstaaelig lyst til naturens studium. Yearbook of the University Museum of Bergen: 17 – 26.

Sars M (1835) Beskrivelser og Iagttagelser over nogle mærkelige eller nye i Havet ved den Bergenske Kyst levende Dyr af polypernes, acalephernes, radiaternes, annelidernes, og molluskernes classer. Thorstein Hallagers forlag, Bergen.

Windsor MP (1976) Starfish, jellyfish and the order of life. Issues in Nineteenth-Century Science. Yale University Press, New Haven. 228 pp

NorHydro goes back to school

To the Research School in Biosystematics (ForBio), that is!

Last April, NorHydro participated in two events organized by ForBio (who is actually one of the partners of our project): the 2019 Annual ForBio Meeting and the ForBio and MEDUSA course “Zooplankton Communities – Taxonomy and Methods”. Both events were very productive and fun, here is the story:

The 2019 Annual ForBio Meeting was held in Trondheim. Many high-quality talks were delivered during this meeting and NorHydro received useful feedback from students and consolidated scientists from all the Nordic countries. It was particularly important for NorHydro to be present at the annual meeting, because together with ForBio we are planning a course on hydrozoan diversity and phylogeny in 2020, so the meeting in Trondheim was the perfect vehicle to advertise both the course and the activities and expected outcomes of the project.

I did not see any hydroid in Trondheim during the meeting, but the trees in the city center looked suspiciously like colonies of Obelia dichotoma. Pictures: Luis Martell

In addition to NorHydro, the University Museum of Bergen attended the meeting with interesting talks from some of our PhD students and guests, presenting diverse subjects as the phylogeny of the plant genus Potentilla (by Nannie Persson), morphological data of the polychaete family Lumbrineridae (by Polina Borisova), and the diversity of the marine snail genus Scaphander (by Justine Siegwald).

Snapshots of two of the UMB talks during the annual meeting: Luis presenting NorHydro (left) and Justine explaining the mysteries of Scaphander (right). Pictures: Nannie Persson

Later in the month, Aino, Joan and I participated as teachers in the course “Zooplankton Communities – Taxonomy and Methods”, an event organized by ForBio in collaboration with the DIKU-funded project MEDUSA. The course was packed with motivated students and beautiful specimens of gelatinous zooplankton, and we managed to collect some hydromedusae for NorHydro as well. The bloom of hydrozoans is more evident in the water column than anywhere else, since the reproductive season is in close relation with the increasing abundance of food items in the plankton (which in turn follows the spring bloom of microalgae), and our samples confirmed that spring is the perfect hydrozoan hunting season. Beautiful sunsets, friendly chats, and exciting lectures complemented the activities of the zooplankton course, making for a great month in the partnership of ForBio and NorHydro!

We caught some interesting jellies during the course, like these Leuckartiara octona (left), Tima bairdii (middle), and Halopsis ocellata (right). Pictures: Elena Degtyareva

Happy participants of the zooplankton course. From left to right: Raphaelle Descoteaux, Christina Jönander, Ksenia Kosobokova, Elena Temereva, Kyle Mayers, Luis Martell, Elena Degtyareva, Aino Hosia, Sanna Majaneva, Ksenia Smirnova, Ekaterina Nikitenko, Anna Shapkina. Joan Soto (right picture) explained how to keep ctenophores alive during the visit to the Ctenophore Facility of the Sars Centre. Pictures: Nataliya Budaeva, Luis Martell

– Luis

Travelouge from the Hardbunnsfauna-project: On a quest for samples

Tide pools and kelp forests in Lofoten (Photo: K. Kongshavn)

In late April Endre, Jon, Katrine and Tom set out from Bergen for what would turn out  to be a rather epic road trip (we ended at 4380 km..!) aiming to collect material for our project on Invertebrate fauna of marine rocky shallow-water habitats: species mapping and DNA barcoding (Hardbunnfauna), the other ongoing Artsprojects, and for the museum collections in general. We had little to no shallow water material in the collections from the region we targeted:

Dark dots are where we have museum material from (though it may be treated in such a a way that it is (no longer) suited for genetic work), and the pink stars are where we collected now (map by K. Kongshavn)

Details of our sampling – we used a variety of gear to collect material, and set up lab where we were staying to process the samples. (Graphic: K. Kongshavn)

Sampling in various habitats using different kinds of gear

The samples were processed (sorted and photographed) at our homes away from home; we managed to rig up quite serviceable lab spaces for ourselves in each spot.

One of the things we were after was kelp stems – or rather, the animals living associated with them

A part of our catch!

A closer look at some of what we found: Hydrozoa and Bryozoa, various crustaceans (pictured are two Mysida, an Isopod and an Amphipod), Nudibranchs and other Gastropods, Polyplacophorana, Ascidians, a Platyheminth and various Cnidaria. 

It was a highly successful – and very lovely! – field trip, and the samples collected will benefit a multitude of ongoing and future research.

Follow us on social media for frequent updates, we are at Instagram and Twitter,  as @hardbunnsfauna

-Endre, Jon, Tom & Katrine

 

Spring time is hydrozoan time

Spring means warmer temperatures, increasing daylight, flowers blooming everywhere… and a lot of outdoor and outreach activities for our projects at the Invertebrate Collections of the museum! In particular, project NorHydro started last month with a kick-off workshop (read more about it here) and we have not stopped collecting specimens, attending conferences, teaching courses and joining sampling trips since then. But why is it that spring is such an important time for hydrozoans and NorHydro?

Well, for starters, spring is the reproductive season for many species of hydrozoans in Norwegian waters. Most Norwegian hydrozoans are seasonal animals and for many of them the increasing temperatures and daylight of March and April trigger a shift in the life cycle towards the production of reproductive stages.

Tiny hydromedusae were already being produced in many of the hydroids we collected, like these colonies of Sarsia tubulosa (left) and Obelia dichotoma (right). Pictures: Luis Martell

Colonies of Eudendrium vaginatum (left), Kirchenpaueria pinnata (middle), and Halecium halecinum (right). Photos: Luis Martell and Joan J. Soto Àngel

The reproductive stages are often necessary to correctly identify a hydroid colony to species level, so we took advantage of the season to collect the very first samples of the project during the kick-off workshop. More than 50 samples of hydrozoans were collected thanks to the efforts of all the participants, and special thanks are due to NorHydro’s team of hydrozoan experts for identifying the specimens and making for a great start of the project.

The hydrozoan team: Aino (left), Peter (in both pictures), and Joan (right), hanging around in the lab of the Marine Biological Station during the kick-off workshop. Pictures: Luis Martell

Peter Schuchert from the Natural History Museum of Geneva was a very special participant in this meeting, where he kindly shared his extensive expertise with us. Peter’s knowledge of hydrozoans is impressive, and it was a real pleasure to learn from him on everything from collecting methods to preservation techniques and species identities. Completing our team of experts were our very own Aino Hosia from the University Museum, who stopped by to share some of her experiences on hydrozoan diversity in the region, and Joan J. Soto Àngel from the Sars International Centre for Marine Molecular Biology, who collected many specimens and participated in several interesting discussions about the expected outcomes and potential subprojects of NorHydro.

Our samples were full of hydroids, most of which were documented and preserved for future DNA work. Pictures: Luis Martell and Joan J. Soto Àngel

Of course one of the great advantages for NorHydro during the workshop was the possibility to learn from the activities and results of our sister projects Sea Slugs of Southern Norway and Hardbunnfauna, and to share experiences with them and with the members of the university’s student dive club (SUB-BSI). With such amazing partners and professional collaborators, it was impossible for the kick-off workshop not to be a big success, so thank you all for giving NorHydro the best possible start!

We had all types of weather during the workshop, going from almost-summer to snowy-winter in the same day! Pictures: Luis Martell

Keep up with NorHydro here on the blog, as well as in the Facebook page of Hydrozoan Science  and in Twitter with the hashtag #NorHydro.

Luis

Workshop week at Espegrend field station

The final week of March was teeming with activity, as no less than three Norwegian Taxonomy Projects (Artsprosjekt) from the Invertebrate Collections arranged a workshop and fieldwork in the University of Bergen’s Marine biological field station in Espegrend.

The projects – Sea Slugs of Southern Norway(SSoSN), Norwegian Hydrozoa (NorHydro) and Invertebrate fauna of marine rocky shallow-water habitats: species mapping and DNA barcoding (Hardbunnfauna) fortunately overlap quite a bit in where and how we find our animals (as in, Cessa’s seaslugs are eating the organisms the rest of us are studying..!), and so it made sense that we collaborated closely during this event.

That meant more hands available to do the work, more knowledge to be shared – and definitely more fun! All projects had invited guests, mostly specialists in certain groups, but also citizen scientists, and our students participating. We stayed at the field station, which has excellent facilities for both lodging and lab work.

Participants on our Artsprojects workshop in March. Left from back: Peter Schuchert, Manuel Malaquias, Bjørn Gulliksen, Jon Kongsrud, Tom Alvestad, Gonzalo Giribet. Middle row from left: Heine Jensen, Luis Martell, Endre Willassen, Eivind Oug, Front row from left: Katrine Kongshavn, Cessa Rauch and Jenny Neuhaus (Photo: Heine Jensen)

The fieldwork was carried out in the Bergen region, and was done in various ways. We had the R/V “Hans Brattstrøm” available for two days, where we were able to use triangular dredges, plankton net, and grab to sample.

Other days we used a small boat from the station to go to the islands close to Espegrend to examine the tide pools and tidal belt. We also went to local marinas and scraped off what was living on the piers, and a brave soul donned her wet suit and went snorkeling, which enabled us to sample very specific points of interest (“take that green thing over there!”).

We are fortunate here in Bergen in that we have a very active local student dive club, SUB-BSI, whose divers kindly kept an eye out for – and even collected – some of our target animals, as well as sharing their photos of the animals in their natural habitat, all of which is amazing for our projects!
We gave short presentations of each of the projects at SUB in the beginning of the week, and invited the divers out to the lab to on the following Thursday to show some of the things we are working on. It was a very nice evening, with a lot of interested people coming out to look at our critters in the lab. We also decimated no less than 14 homemade pizzas during that evening – learning new stuff is hard work!

Guests in the lab (photos K. Kongshavn)

All together, this made it possible for us to get material from an impressive number of sites; 20 stations were sampled, and we are now working on processing the samples.

The locations where we samples during the week (map: K. Kongshavn)

We are  very grateful to all our participants and helpers for making this a productive and fun week, and we’ll make more blog posts detailing what each project found – keep an eye out for those!

You can also keep up with us on the following media:

 NorHydro: Hydrozoan Science on Facebook, and Twitter #NorHydro

@Hardbunnsfauna on Instagram and Twitter

SeaSlugs: on Instagram and in the Facebookgroup

 Cessa, Luis & Katrine

Sea slug hunt in Egersund!

I’m always scared to look at the current date, time flies! It was already two months ago that we went on a blitz fieldwork trip to Egersund with a very special group of people. But nevertheless, good times become good memories (and especially good museum specimens) and it definitely does not get too old for a small blog about it.

From January 17 to January 21 a small group of sea slug enthusiasts consisting of a student, citizen scientists, a collaborator and museum members rented a van and drove 7 hours down to our Southern neighbor town Egersund.

Egersund was not randomly picked as it is the home town to one of Norway’s most productive and dedicated ‘citizen scientist’; Erling Svensen. Author of a number of books and the most well-known and worldwide used ‘Dyreliv I havet – nordeuropeisk marin fauna’ (English Marine fish and invertebrates of Northern Europe), which amateurs and professionals alike use as an extensive research source.

Erling Svensen’s famous book Dyreliv I Havet

With his almost 5000 dives and counting, Erling knows the critters of the North Sea, big and small, on the back of his hand. Already since the beginning of the sea slug project, Erling was helping providing valuable sea slug species, so it was about time to pay him a visit and bring our team over to make Egersund “biologically unsafe” – enough so to end up in the local news!

We made Egersund unsafe enough to have a small news item about it in the ‘Dalane Tidende’, a local newspaper

The group consisted of Manuel, Cessa, citizen scientist Anders Schouw, collaborator from Havard University Juan Moles and master student Jenny Neuhaus

From left to right Erling Svensen, Anders Schouw, Jenny Neuhaus, Cessa Rauch, Juan Moles and Manuel Malaquias. Photo by Erling Svensen

Jenny just started her Masters in Marine Biology at the University of Bergen in the fall of 2018, she will be writing her thesis on the diversity of sea slugs from the Hordaland county and on the systematics of the genus Jorunna (Nudibranchia) in Europe. The results of this work will definitely become a blog entry of its own.

Jorunna tomentosa, Jennies new pet! Photo by Nils Aukan.

Two of the five days of our fieldwork were basically spendt driving up and down from Bergen to Egersund, it left us only with a good 3 days to get an overview of Erling’s backyard sea slug species. Little time as you can imagine. But time was used efficiently, as Anders and Erling are both extremely good sea slug spotters and with help of sea slug specialist Juan and the eager helping hand of Jenny, Manuel and I were able to identify and add 36 species to our museum sea slug database.

Overview of collected specimens in Egersund

In comparison, we registered 41 one species in Drøbak last year by spending almost a week at the field station! No one thought this would be the outcome (not even Erling himself, as he mentioned that he didn’t find that many sea slug species this time of year on earlier surveys). But we were all very happily surprised, and maybe it was not just luck but also the combination of people we had attending this short field trip. With so many good specialists, either professional or amateur, senior or junior, we were able to work extremely efficient and with a clear communal goal. There was little time spend in reinventing the wheel and explaining the work flow, it was a good valuable exercise that will definitely help us with future brief fieldwork trips and how to make the most from short and tight time schedules. Besides it was a very valuable experience for our student Jenny, as she got first-hand experience with what it’s like to see her study specimens alive, how to handle these fragile individuals, how to sort them from other species and how to document them, which is a good thing to know for her thesis and future career

Jenny learning a lot from the master himself. Photo by Erling Svensen

So yes, all in all our Egersund fieldtrip was short but very sweet!

Furthermore
You want to see more beautiful pictures of sea slugs of Norway! Check out the Sea slugs of Southern Norway Instagram account; and don’t forget to follow us. Become a member of the sea slugs of southern Norway Facebook group, stay updated and join the discussion.

Explore the world, read the invertebrate blogs!

-Cessa & Jenny

Project NorHydro: a quest for hydroids in Norwegian waters

One of this year’s new projects at the Invertebrate collections is NorHydro – Norwegian Marine Benthic Hydrozoa.

Both stages in the typical life cycle of a hydroid (polyp and jellyfish) are represented in the logo of the project

Funded by the Norwegian Biodiversity Information Centre (Artsdatabanken), NorHydro will be dedicated to the study of the ubiquitous (but commonly overlooked) marine hydrozoans of Norway.

Some of the most conspicuous Norwegian hydroids are large colonies somewhat resembling branching trees. Many other animals and algae may grow on these colonies making them their home

Hydrozoans are an ecologically and economically important group of animals. With approximately 3800 described species –and probably many more to be discovered– they are the most diverse group of medusozoan cnidarians in terms of number of species and life cycle strategies. Some hydrozoans live all their lives as jellyfish in the water column (thus they are holoplanktonic), but the vast majority of the species either take the form of polyps permanently connected to the sea-floor (benthic) or are meroplanktonic (i.e. possessing both a benthic polyp and pelagic jellyfish stage). Most of the time, the benthic marine hydrozoans (also called hydroids) go unnoticed by the public, but at times they can grow massively on submerged structures, causing problems for aquaculture, fisheries, and navigation, or producing huge numbers of jellyfish that in turn have a great impact on the local marine environment.

Hydroids come in different sizes and shapes. Colonies living on the same substrate (like these members of Cuspidella, Sertularella, and Grammaria) do not necessarily resemble each other.

To get a better overview of which hydroid species are present in Norwegian waters, NorHydro will sample, record, chart, and DNA-barcode specimens occurring all along the Norwegian coasts. The project will rely on specimens deposited in museum collections as well as on constantly obtaining new live animals that will be identified and documented with photos before they are fixed in ethanol for DNA barcoding of CO1 and 16S sequences. Producing information on the morphology (how does it look) and the DNA sequences (the information within) of Norwegian hydroids is very important, because together these data will allow NorHydro to generate useful tools for the future identification of hydroids from all around the world.

Dredges, grabs, sledges, diving and simply taking them by hand are all valid sampling methods when it comes to marine benthic hydroids. The specimens are then sorted, identified, documented with images, processed for DNA barcoding, and finally incorporated to the museum’s collection for future reference.

Understanding hydroid diversity in Norway is not an easy task, but fortunately NorHydro is not alone in this quest: several partners in Norway and abroad will team up with our project, including NorBOL (the Norwegian Barcode of Life), NTNU University Museum, Norwegian Institute of Marine Research, ForBio Research School in Biosystematics, Natural History Museum of Geneva, University of the Balearic Islands, and the Institute of Oceanology of the Polish Academy of Sciences. NorHydro will also benefit from collaborations with the other four currently ongoing NBIC projects at the Invertebrate Collections of the museum (see an overiview of each of these projects here, in Norwegian), which we are sure will result in a lot of exciting discoveries in the near future.

One important goal of NorHydro is to present marine hydroids to all those not familiar with these amazing creatures. In order to do that, we will regularly write entries here on the blog, as well as posting updates in Facebook and in Twitter with the hashtag #NorHydro. The official info webpage for the project is available here in English, and here in Norwegian, so don’t forget to check it out!

-Luis

New year, new field work!

2019 will bring a lot of field work for us at the invertebrate collections – not only do we have our usual activity, but we will also have *FIVE* Norwegian Taxonomy Initiative projects (Artsprosjekt) running!

On a rather windy Tuesday in January, four of us – representing four of these projects – set out with R/V “Hans Brattstrøm”.

Four projects on the hunt for samples! Photo: A.H.S. Tandberg

Our main target for the day was actually not connected to any of the NTI-projects – we were hunting for the helmet jellyfish, Periphylla periphylla. We need fresh specimens that can be preserved in a nice way, so that they can be included in the upcoming new exhibits we are making for our freshly renovated museum. We were also collecting other “charismatic megafauna” that would be suitable for the new exhibits.

We have been getting Periphylla in most of our plankton samples since last summer, so when we decided this was a species we would like to show in our exhibits about the Norwegian Seas, we did not think it would be a big problem to get more.

This is a species that eats other plankton, so normally when we get it, we try to get rid of it as fast as possible; we want to keep the rest of the sample! But we should have known. Don’t ever say out loud you want a specific species – even something very common. Last November, we planned to look specifically for Periphylla, and we brought several extra people along just because of that. But not a single specimen came up in the samples – even when we tried where we “always” get them…

Lurefjorden is famous for being a hotspot for Periphylla – so the odds were in our favor! Map: K. Kongshavn

Wise from Novembers overconfident cruise, this time we planned to call to the lab IF we got anything to preserve. The Plankton-sample did not look too good for Periphylla: we only got a juvenile and some very small babies. So we cast the bottom-trawl out (the smallest and cutest trawl any of us have ever used!), and this sample brought us the jackpot! Several adult Periphylla, and a set of medium-sized ones as well! Back in out preparation-lab an entire size-range of the jelly is getting ready for our museum – be sure to look for it when you come visit us!

We of course wanted to maximize the output of our boat time– so in addition to Periphylla-hunting, we sampled for plankton (also to be used for the upcoming ForBio-course in zooplankton), tested the traps that NorAmph2 will be using to collect amphipods from the superfamily Lysianassoidea, checked the trawl catch carefully for nudibranchs (Sea Slugs of Southern Norway, SSSN) and benthic Hydrozoa (NorHydro), and used a triangular dredge to collect samples from shallow hard-bottom substrate that can be part of either SSSN or the upcoming projects NorHydro (“Norwegian marine benthic Hydrozoa”) or “Invertebrate fauna of marine rocky shallow-water habitats; species mapping and DNA barcoding” (Hardbunnsfauna).

The Hardbunnsfauna project was especially looking for Tunicates that we didn’t already have preserved in ethanol, as we want to start barcoding these once the project begins in earnest (last week of March). We also collected bryozoans, some small calcareous sponges, and (surprise, surprise!) polychaetes.

When it comes to hydrozoans, we were lucky to find several colonies of thecate hydroids from families Campanulariidae and Bougainvilliidae that represent some of the first records for NorHydro. Hydroid colonies growing on red and brown algae were particularly common and will provide a nice baseline against which diversity in other localities will be contrasted.

Different hydroid colonies growing on algae and rocks at the bottom of Lurefjorden. Photo: L. Martell

There were not a lot of sea slugs to be found on this day, but we did get a nice little Cuthona and a Onchidoris.

But what about the Amphipod-traps? Scavengers like Lysianassoidea need some time to realize that there is food around, and then they need to get to it. Our traps have one small opening in one end, but the nice smell of decomposing fish also comes out in the other end of the trap. We therefore normally leave traps out at least 24 hours (or even 48), and at this trip we only had the time to leave them for 7 hours. The collected result was therefore minimal – we even got most of the bait back up. However, knowing that we have a design we can deploy and retrieve from the vessel is very good, and we got to test how the technical details work. It was quite dark when we came to retrieve the traps, so we were very happy to see them! All in all not so bad!

We had a good day at sea, and it will be exciting to see some of our animals displayed in the new exhibits!


If you want to know more about our projects, we are all planning on blogging here as we progress. Additionally you can find more on the

-Anne Helene, Cessa, Luis & Katrine 

Door #18: The hypnotic adventure of the Norwegian jellyfish

The end of the year is always a crazy time full with work deadlines and holiday planning, but if one can find a few minutes in between last-minute shopping and gift-wrapping, the last days of December can also offer the opportunity to reflect on past and current experiences and what we have learned from them. It is also a special time for closure, so it feels natural that it coincides this year with the end of HYPNO, one of the projects of the Invertebrate collections funded by the Norwegian Taxonomy Initiative.

For the last three years, project HYPNO (Hydrozoan pelagic diversity in Norway) has been documenting and DNA-barcoding the diversity of hydromedusae and siphonophores in Norwegian waters. We have learned a lot about the distribution of these animals in the process, especially since we have come face to face (or rather face to tentacle) with more than 1100 specimens from all parts of the country.

Representative species of the groups within Hydrozoa that were the object of study of HYPNO (from left to right and top to bottom): Amphinema rugosum (Anthoathecata), Mitrocomella polydiademata (Leptothecata), Lensia conoidea (Siphonophorae Calycophorae), Agalma elegans (Siphonophorae Physonectae), Botrynema ellinorae (Trachymedusae), Bathykorus bouilloni (Narcomedusae). Pictures: Luis Martell and Aino Hosia.

Telling all these organisms apart was not always an easy task, but thanks to a combination of traditional taxonomy and genetic methods we have been able to identify more than 120 species, including several new records for Norway and a couple of species that had gone unnoticed to the world until today. The project was very successful in getting useful DNA sequences for the majority of these species, which will facilitate the identification of hydrozoans in the future, and that will be available for everybody to use through the online platform of the Barcoding of Life initiative. All the records gathered during the project will also be available to the public (through the interactive maps of Artskart) and a collection of specimens will be stored at the University Museum of Bergen as a reference for anyone interested.

A nice overview of some of the results of HYPNO as displayed in the webpage of BOLD systems.

Additionally, keep an eye open for HYPNO’s most striking results that can be found in several scientific articles (published and in various stages of preparation), and for the project’s last updates in social media.

Without a doubt, HYPNO owes much of its success to the combined efforts of all the individuals and institutions that have collaborated in the project in one stage or another. NorBOL, GooseAlien, NorAmph, and Arts- og naturtypekartlegging av Sognefjorden are only some of the projects with which HYPNO has shared samples, experiences, and field trips. Collecting the animals and curating the specimens and data would not have been possible without the help of the crew working in the research vessels that hosted us and the technical staff at the DNA lab and the invertebrate collections of the museum.

HYPNO included samples from all over Norway, but we particularly enjoyed our regular sampling trips in the amazing Western Norwegian coast. Pictures: Luis Martell, Joan J. Soto Àngel.

Many records for the project came from friends and colleagues working in other institutions and universities in Norway and abroad, all of whom were eager to share their knowledge and time with us in this hypnotic adventure of Norwegian jellyfish.

We had always a great time jelly-hunting in the sea! Pictures: Luis Martell, Joan J. Soto Àngel, Anne-Helene S. Tandberg.

HYPNO may now be coming to an end, but this doesn’t mean that our work on Norwegian hydrozoans is finished. On the contrary, the Invertebrate Collections have been granted a new project starting next year and focusing again on these fascinating animals. We hope that the new project NORHYDRO will be as rewarding as HYPNO, and we know it will be at least as fun: time flies by so quickly when jellyfish and good friends are involved!

-Luis Martell and Aino Hosia

 

Some suggested reading related to the project
Schuchert P, Hosia A, and Leclere L. 2017. Identification of the polyp stage of three leptomedusa species using DNA barcoding.

Martell L, Tandberg AHS, and Hosia A. 2018. The illusion of rarity in an epibenthic jellyfish: facts and artefacts in the distribution of Tesserogastria musculosa (Hydrozoa, Ptychogastriidae). Helgoland Marine Research 72(1):12.

Door #17: Sea bunnies of Norway?

Some years ago, in 2015, the internet was taken a storm by the sudden rise of the so-called sea bunnies. It all started with a video taken the year before by a SCUBA diver in Japan who filmed the little creatures crawling around the seabed:

The species seen in the video is called Jorunna parva, and are since then worldwide unofficially known by the adorable pet name ‘sea bunny’ as it has a ‘fur’ like exterior with tiny upright ‘ears’ and a fluffy tail like bunnies do. The ‘fur’ is actually created by bunches of tiny rods, called the caryophyllidia. The caryophyllidia are arranged around little knots that are often dark coloured, which create the illusion of black dots on the animals. The seemingly ears are the animals rhinophores, that function as chemical receptors that make the animal able to detect its environment in search of food and other sea bunnies. Its tail on the back are actually its gills to extract oxygen molecules from the surrounding water, the ‘fluffier’ it is, the bigger the surface area, the easier it is to diffuse oxygen from the water. This sea bunny is small, often less than 2.5 cm, and can be found throughout the Indo-Pacific; from South Africa to Central Pacific. They have, like many sea slugs do, a high degree of colour polymorphism in the species, with colours varying from white with black dots, to yellow and even bright orange:

Different colours of Jorunna parva, aka the sea bunny (photo credits on image)

Unfortunately, our sea bunny J. parva is only short-lived and just lives from a few months up to a year, but at least during its short life it doesn’t need to worry about predators. They are very toxic, because of the food they eat, which are sponges. All dorid nudibranchs (the group of slugs J. parva belongs to) are toxic because of their diet, and these toxins are often used in cancer treatments for people. Who would have thought that sea bunnies would be lifesavers, besides  being cute? But is the word sea bunny only referring to this particular species called J. parva? A quick search on the internet definitely tells us otherwise, it seems people refer to sea bunnies when they talk about any other dorid nudibranch with a fluffy and round appearance.

So, the question remains, do we have any sea bunnies in Norway? And the answer is yes, we do!

Sea bunnies of Norway (click to enlarge!)

And they are absolutely great and adorable to encounter underwater. Let us make a list of the sea bunnies of Norway, so we know what species we are talking about. Sea bunnies of Norway are; Doris pseudoargusGeitodoris planataJorunna tomentosaRostanga rubraCadlina laevis, Aldisa zetlandicaAdalaria loveniAdalaria proximaOnchidoris muricataOnchidoris bilamata,
Onchidoris pussilaOnchidoris depressaAcanthodoris pilosaDiaphorodoris luteocincta and I personally would draw the line at Goniodoris nodosa, as the other Goniodoridae don’t resemble that much the typical sea bunny characteristics. What do you think? Which species do you think are missing in this list, or which species should be left out?

I think it is time to take over the internet with our sea bunnies of Norway!

 

Furthermore
You want to see more beautiful pictures of sea slugs of Norway!

Check out the Sea slugs of Southern Norway Instagram account; and don’t forget to follow us.
Become a member of the sea slugs of southern Norway Facebook group, stay updated and join the discussion.

Explore the world, read the invertebrate blogs!

-Cessa