Polina, a master student jointly supervised by Dr. Nataliya Budaeva (UiB) and Dr. Alexander Tzetlin (Moscow State University) has spent a month in the invertebrate collections studying the bristle worms from the family Lumberineridae from the Western African Waters.
Lumbrinerid genera can be distinguished by the morphology of the jaw apparatus consisting of ventral fused mandibles and two rows of dorsal maxillary plates. Polina learned how to dissect the jaws and identified at least 11 genera of Lumbrinerids from the studied material. She is also planning to used microCT back at the Moscow University to study the morphology of the jaws in 3D. During her stay, Polina has studied the composition and morphology of chaetae, another character used in generic and species identification in Lumbrinerids, using SEM.
Scanning Electron Microscope (SEM) images of Lumbrinerids: A – Ninoe sp. anterior part of body, ventral view; B – the same, close view of parapodia and chaetae; C – Gallardoneris sp., compound hooks; D – Scoletoma sp., anterior part of body.
All the stations from which we have submitted specimens for barcoding
By clicking around on the map you can see how many specimens we have submitted from each station, as well as photos of the animals and wether or not the sequencing was successful and resulted in a genetic barcode.
By clicking on a station, you get the information about which animals have been sequenced – here two brittle stars that were both successfully barcoded
The samples we have submitted (so far – there are still plans to do more!) include several animal main taxa; Crustaceans, Echinoderms, Molluscs and Polychaetes. These animals have been sorted out and identified by employees at the invertebrate collections, and by visiting guest researchers who have come here to work in the material – so it is very much a combined effort behind this.
# of submitted specimens (animals) from each phylum
Not all our material is suited for genetic analyses; fixation in formaldehyde gives well preserved specimens that are well suited for morphological examinations – which is the backbone of taxonomy – but it distorts the DNA so that the samples are not eligible for molecular work.
Provided that the material has been fixated in a DNA-friendly way (i.e. in ethanol), there is a lot of work to be done before we are left with identified specimens. We wrote a bit about the sorting of samples her: “biodiversity in a dish”.
We are still working actively with this material and with the results we are getting – some of it has already been published – se our list of publications here – and more is on the way.
The first weeks of July have been dedicated to the collections of Hydrozoa. Although the species that is presently known as Sarsia tubulosa has been almost a totem animal to marine biologists in Bergen since Michael Sars’ pioneering studies of cnidarians and other invertebrates on the Bergen coast, this taxonomically complex group has received relatively limited attention from local students.
We are very pleased therefore that Professor Francesco Ramil Blanco and his PhD-student Marta Gil from the University of Vigo are taking the time to examine some of our material of benthic hydrozoans. Benthic hydrozoans are sitting on various forms of substrate like sand, stones or dead shells. But many are also epibionts, which means that they are attached to other organisms such as algae, crustaceans or even other hydrozoans.
Front end of a Hyas crab carrying Hydrozoa and other organisms.
The alternation of generations between polyp and medusa stages, one of M.Sars’ discoveries, is just one of the reasons why these small cnidarians, the more inclusive group that the hydrozoans belong to, have been taxonomically challenging. There are many examples of such different life history stages having been described over time as different species. But there are also other reasons as to why hydrozoans should be studied more thoroughly. Access to new material, better microscopes and molecular techniques are giving researchers new possibilities to assess the diversity of these strange animals.
Specimens of Hydrozoa are mounted in resinous medium for microscopy.
Slides for microscopy
Streptocaulus dollfusi – microscopy picture of part of a colony from West Africa identified by Ramil and Gil.
Ongoing studies of the polychaete worms collected by « R/V Dr Fridtjof Nansen» cruises are revealing a great diversity of species including many that are also completely new to science. This observation is demonstrated in a recently completed master thesis presented by Mr Martin M. Hektoen for the Faculty of Mathematics and Natural Sciences at University of Bergen.
Mr. Hektoen decided to to respond to our announcement in 2013 of a master project and studied the genus Diopatra in the GCLME and CCLME regions supervised by Dr. Nataliya Budaeva.
Nataliya Budaeva and Martin M. Hektoen
He presented his work in public before the examination commission on June 26th. The thesis is begun with an opening quote from H. Hemsworth Day (1960) reading: “ … the question as to whether there is one species of Diopatra or several species is a matter of controversy.”
Hektoen’s resolution to what may now seem more as a deceased controversy is a paper recognizing nine new species of Diopatra from the East Atlantic. The studies are based on detailed morphological studies, – microscopy and Scanning Electron Microscopy, and supplemented by DNA-sequencing of mitochondrial genes. Laborious descriptions, identification keys, and a phylogenetic analysis are some of the important elements of the thesis contents.
Adjudication of the work was performed by polychaete specialist Dr Eivind Oug from the Norwegian Institute of Water Research, Grimstad, and Prof. Anders Hobæk from the Department of Biology at UiB. We extend our congratulations to Martin for his comprehensive work and fine work, and are looking forward to see the results in a peer reviewed publication in the near future. Cheers, Martin!
Home institution: University Museum of Bergen, Norway (blog here)
What do you work with at home?
Samples, big and small
I have recently been working on preparing material for the workshop by sorting benthic samples from the West-African coast, paying particular attention to the Bivalvia (clams, oysters, cockles etc.) and the Ophistobranchs (a group of gastropods/snails), as these are some of the focus groups for the workshop. I defined the specimens to morphospecies and/or genus, to ease the work for the experts who will be working on identifying them to species. I am also preparing papers on Cephalaspidea and Philinidae (snails) from my master thesis work, and preparing to start my Ph.D.
Jar upon jar upon jar of molluscs
What are you working on here?
On the workshop I have been nominated as the “gastropod team”. The previous workshop got a lot of nice results on the gastropods, and it was decided to continue the work this year. My task is to organize the species by family, and pick suitable specimens from target families that we wish to do DNA barcoding on, prepare the barcoding samples, and keep the database up to date.