Short science posts | Scyphozoa – more advanced nervous system

Scyphozoa (true jellyfish) are much more interesting (in a neurobiological way) than previously described corals. One major difference is that Scyphozoa are pelagic animals, which means they are not fixed to the ground. They also have two diffuse nerve nets (subepidermal and subgastrodermal) that consist of bipolar and multipolar neurons – the impulse conduction has been measured at 0,15 m/s. Both nets coordinate the movements of an animal towards the food. Some scientists, however, differentiate one diffuse and one motor nerve net. The motor net is in charge of the activation of muscle contractions after receiving signals from the so-called pacemaker organs (which are in charge of the swimming rhythm). The diffuse net, in this case, is in charge of marginal tentacle contraction and it is also believed it communicates sensory information to jellyfish musculature. Neurons of the motor nerve net are connected by chemical synapses, while neurons of diffuse nerve net are connected by peptidergic synapses that were noted in Anthozoa as well.

Sycphozoa also have much more developed sensory organs than any of the animals previously mentioned. These sensory structures are called rhopalia and they are located on the edges of the jellyfish bell – there are usually four of them (or a number that’s a multiple of four). Rhopalia contain multiple sensory receptors – statocyst (balance receptor), ocelli (light sensitivity), a mechanoreceptor, a chemoreceptor, and aforementioned pacemaker neurons.

I would also like to note here that some authors (I’m referring here to the article “Do jellyfish have central nervous systems?” by R. A. Satterlie) believe this kind of nerve net explanation is rather simplified and that there exist some evidence suggesting that jellyfish have a centralized nervous system, mainly that rophalia are in fact rudimentary ganglia and could be regarded as integrative centers. However, any communications between rhopalia themselves exist only through the nerve nets.

Literature & more information:
Habdija et al: Protista-Protozoa, Metazoa-Invertebrata, Alfa, 2011, Zagreb
Do jellyfish have central nervous systems?
Jellyfish nervous systems

Short science posts | Anthozoa & nerve cells

Anthozoa (corals & anemones) are interesting animals that live exclusively in seas and oceans. Since they are regarded as sessile organisms, their nervous system is not very advanced. In a previous post, I mentioned that all cnidarians have two diffuse neural nets, and that is true for Anthozoans as well. Multipolar nerve net neurons are connected with synapses, and they also possess sensory cells that are particularly numerous around the mouth and on the tentacles.

One paper investigated traveling of electrical waves in a coral nerve network in coral colonies in genus Palythoa. It was experimentally observed that this electrical wave spreads at the constant speed from the site of simulation. Furthermore, peptidergic neurons (the ones using neuropeptides to communicate) were also noted in Anthozoa.

Did I draw this when I was 5 or 25? – A mystery.

Nematostella vectensis, also known as starlet sea anemone, is a species of Anthozoa that is known as a model organism – its genome and development have been carefully studied, including its nervous system. In this species, oral and pharyngeal nerve rings have been reported, as well as  longitudinal tracts of neurites (neurites are usually axons or dendrites). These findings would suggest that some groupings of neural cells exist in at least some Anthozoan species after all. Sensory neurons, interneurons, motorneurons, and neurosecretory‐like gland cells were also reported to exist in N. vectensis.

Note: in case I didn’t mention this before, cnidocytes are often considered neural cells because they display mechanosensory properties and calcium dependent neural‐like properties as well.

Literature & more information:
Habdija et al: Protista-Protozoa, Metazoa-Invertebrata, Alfa, 2011, Zagreb
The rise of the starlet sea anemone Nematostella vectensis as a model system to investigate development and regeneration
Cnidarians and the evolutionary origin of the nervous system
Model of traveling waves in a coral nerve network

Short science posts | What is a nerve net?

A nerve net is a type of nervous system that consists of many neurons but there is no brain or cephalization. Nerve nets are found in animals with radial symmetry (Cnidaria) and biradial symmetry (Ctenophora). Despite being called a net, there sometimes exist some groupings of neural cells in some Cnidaria classes, which I will write more about during the next couple of weeks.
Cnidaria are specific due to their specialized organelles, cnidocytes, which they utilize to hunt for food or use for securing itself to a surface. Some cnidocytes contain toxins that can paralyze their prey (the burning sensation you may have felt when touching a sea anemone 😉).
As a rule, Cnidaria have two diffuse nerve nets, one in the epidermal layer and a second one in the gastrodermal layer. In between these two layers is the mesoglea, a layer that functions as sort of a skeleton. The epidermal net consists of bipolar and multipolar nerve cells, while the gastrodermal net is made up of only multipolar cells.

Cerianthus membranaecus (known as cylinder anemone or coloured tube anemone)

Cnidarian nerve systems are fascinating but also quite unexplored. What is known is that nerve cells consist of two types of neurons, sensory neurons that respond to stimuli and motor neurons which ultimately trigger a response. Chemical synapses exist and provide the communication between the neurons. Hormones have also been reported in some cnidarians (steroids, neuropeptides) but it is still not known how exactly these signalling molecules work.

***

In the next couple of weeks, I will write a post about every cnidarian class and also ctenophores, focusing on their nervous and sensory systems. If you have any questions or would like me to focus on something, please let me know!

Literature & more information:
Habdija et al: Protista-Protozoa, Metazoa-Invertebrata, Alfa, 2011, Zagreb
Endocrine-like Signaling in Cnidarians: Current Understanding and Implications for Ecophysiology
Evolution of sensory structures in basal metazoa

Short science posts | Do sponges have a nervous system?

Sponges (phylum Porifera) are sessile multicellular organisms that live predominantly in seas and oceans. They don’t have tissues or organs, and therefore, they don’t actually have a nervous system. However, they do have bipolar and multipolar cells that resemble nerve cells, which are found in the middle, “jelly-like”, layer.
Sequencing of some sponge species showed the presence of many genes associated with neural cells, such as genes that code enzymes for neurotransmitter synthesis and synaptic transmission. It is important to note that these genes have other functions in the organism. It has also been observed that some sponge larvae can respond to outer stimuli and show various “taxis” behaviour – phototaxis (response to light), geotaxis (response to gravity), rheotaxis (response to water current). Phototaxis has been closely studied in species Amphimedon queenslandica (class Demospongiae), a sponge native to Coral Sea.

Aplysina aerophoba, also of class Demospongiae, which can be found in Adriatic Sea.

Potassium channels have been observed in that same species, as well as glutamate, GABA, and NO systems, which have been investigated in Ephydatia muelleri, another species of class Demospongiae. Electrical signalling has been noted in glass sponges (class Hexactinellida). These sponges have bodies comprised of a syncitial tissue and their skeleton is made of silicon dioxide. The scientists were able to measure the action potential (5s long, with 29s refractory period) and deduce this signal relies on potassium and calcium ions.
Some scientists even suggest that sponges used to have a nervous system, but lost it during evolution – they introduced several hypothetical scenarios for this event, proposing that sponges lost their nervous system in order to focus on filtering.

Literature & more information:
Habdija et al: Protista-Protozoa, Metazoa-Invertebrata, Alfa, 2011, Zagreb
Evidence for Glutamate, GABA and NO in Coordinating Behaviour in the Sponge, Ephydatia Muelleri (Demospongiae, Spongillidae)

The GABAergic-like System in the Marine Demosponge Chondrilla Nucula
Where is my mind? How sponges and placozoans may have lost neural cell types
Elements of a ‘nervous system’ in sponges

Short science posts | Nervous system evolution

For the next couple of weeks, I would like to write a bit about the evolution of the nervous system, from early nerve cells to the human nervous system and brain evolution. Alongside nervous I will also focus, to a lesser extent, on sensory systems. These posts will be published on my Instagram account, but I decided to publish them on the blog as well.

Mostly, these posts will be about various animals and the nerve systems they have – nerve nets, nerve cords, complete systems. The main process behind this is called cephalization, and it starts with the groupings of nerve cells and ganglia at one end of the body. After some (long) time, this process led to us having a head with sensory organs and a brain inside it.

But when did all of it start? It is kind of hard to say, for even single-celled organisms, such as bacteria, have voltage-gated channels and genes that support the theory of possible synaptic transmission. These channels are potassium (the oldest), calcium, and, rarely, sodium channels as well. Action potentials have been detected in some algae and diatoms, although their function is mostly unclear. In Chlamydomonas (unicellular green algae) on the other hand, potentials were detected in flagellums, which clearly suggest they play the part in the movement of the algae. Action potentials were also recorded in the cilia of some protists, such as Parmecium.

Of course, the exact evolutionary processes are unknown, and there is a possibility that these organisms acquired the mentioned features later than scientists now assume. It is also possible that some more evolved organisms, such as sponges, subsequently lost some of the features discussed here (more about this in the next week’s post).

Literature & more information:
Habdija et al: Protista-Protozoa, Metazoa-Invertebrata, Alfa, 2011, Zagreb
Bacterial voltage-gated sodium channels (BacNaVs) from the soil, sea, and salt lakes enlighten molecular mechanisms of electrical signaling and pharmacology in the brain and heart
Early evolution of neurons
Deep evolutionary origins of neurobiology
From damage response to action potentials: early evolution of neural and contractile modules in stem eukaryotes

Biology in popular culture – FORTITUDE (season 1)

Couple of weeks ago, as I was driving to classes, I saw a big billboard that showed couple of people and a word “FORTITUDE”. At first, I thought it was some kind of fantasy drama, but after looking it up, it turned out to be crime related TV show starring actors I like. And as a true crime buff who enjoys all crime related content, I decided to watch it. After all, if it stars Christopher Eccleston (the best Doctor Who) and Stanley Tucci, it must be great, right?

Well, not quite –  there are parts of the series that I loved, especially ones regarding biology, despite some of them being naively incorrect. Other parts were not so well executed, but today I want to focus mainly on biology (obviously). Fortitude, the name of the show, is also a name of the imaginary town on an island in polar circle. As it is in small towns, they have a doctor, police force, one hotel, some houses, and many secrets. Oh, and research centre, of course!

Spoilers below!

(skip to the last paragraph for pure Biology)

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Photo by Om Malik on Unsplash


In the first episode, we see a scene where hungry polar bear eats a person. Also, we are introduced to an ambitious post-doc whose research focuses on apex predators; he has a theory that due to environmental changes, predators change their behaviour and develop cannibalistic urges (yes, there was some talk about bear eating another bear). Also, they make a point of making fun of him because he researched that in Britain, where badgers are only the predators. I don’t know why was that supposed to be funny, because I’d rather encounter a wolf than a badger, but I decided to let that one slide. Another story-line follows two children, a boy and a girl, who find a mammoth tooth; this boy later develops mumps-like symptoms and frostbite on his feet (he wandered off); there is also a murder of The Ninth Doctor, and we are led to believe that the murderer was father of the girl who found the mammoth tooth. Why, you may ask? Because he didn’t want to surrender the thawed carcass but sell it to The Ninth. And due to global warming, the carcass has already started to thaw.

Now, that immediately rang a bell; old preserved animal, suspicious disease… Despite some lazy writing, I continued to watch the series, despite not being really satisfied with the direction of it; some of the characters were very well characterized, especially Richard Dormer’s Sheriff, but I generally dislike series where everyone is cheating on everyone with anyone – it feels as if writers think that’s the only way to induce tension and drama. Also, Sheriff’s obsession with one female character was a bit too much – this amount of stalking and re-reading her files is not normal and has no place in adult behaviour. And he’s kind off supposed to be a good guy in the end. I digress, because this post is about biology.

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Hello human, are you tasty?

Photo by Bao Menglong on Unsplash


The aforementioned boy ends up first in the hospital, and then in the research centre where they are developing a method to treat frostbite. Not a lot has been said about this, so I can’t actually comment on it, apart from the fact that he’s being held sedated, in a tank, where it’s not exactly clear how they feed him (I haven’t noticed any openings for infusion pipes). Also, who’s caring for him in the research centre? Someone has to wash him and change him every day, but they made it a point that he’s not supposed to be woken up, due to frostbite pain. So, not exactly biology,  but big mistake anyway.

Also, at one point, their only doctor is almost murdered (by her own daughter who developed symptoms similar to the boy and then died due to heart failure) and they have to preform a lumbar puncture on the boy. Again, why you may ask? Well, during the autopsy of  murderous daughter, the post-doc and his veterinary boss discovered some molecules;  some anti-bodies and IgE. And immediately they developed the theory that this was some different kind of disease that turns people into murderers. Which wouldn’t been such problems, apart that IgE’s are the common antibodies that could indicated allergy of some sort? And in their research lab, they don’t have electronic microscopes, which are used to see viruses? A mess. That’s the only word I can use to describe this plot jumps, a big headache-inducing mess. However, let’s go back to the lumbar puncture. Doctor, I presume general practitioner, is incapable of helping, since she’s basically on her death-bed. So a post-doc and his boss decide to do the lumbar puncture, because why not? (Hint: NO.) They do it perfectly, but before it, they ask the boy’s mother for permission, because lumbar puncture is painful. (Hint: It’s not! Headache that comes after is painful, but the puncture itself doesn’t actually hurt. Source: been there, done that.) Anyway, boy’s spinal fluid doesn’t show presence of whatever thing they were looking for, which de facto labels him a murderer of The Ninth Doctor (excuse me?), despite having positive anti-bodies in his blood, which indicated that he might have had that mysterious disease. My only comment is, no, it doesn’t work like that, and please everyone stop thinking that you understand immunology, especially when we have specialized doctors who spend their lives learning about our immune system.

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Photo by Joyce McCown on Unsplash


Anyway, back to the mammoth carcass, and the rest of mammoths that are thawing on this island. I would just like to say that there are also some Russians involved in the whole story (they work in a mine), the Governor wants to make an ice hotel on a glacier (I’m not kidding – on. a. glacier.), and literally everyone has a secret and/or secret agenda.
Well, before mammoths, let’s talk about one thing they got right, and that’s IgE – it gives us immunity to various parasites. And as it turns out, the mammoths were infected, just not with a virus, but parasitic wasp. Basically, larvae survived in mammoths, and were now making humans their hosts – since they were as old as mammoths, the humans didn’t actually have some real defenses against them. This is also definitely confirmed after post-doc finds some live wasps in the doctor (he then sets the whole room on fire, in order not to get infected or allow the wasps to find new hosts – yes, he survives).

Ichneumonidae, also known as Darwin wasps, are indeed parasitic wasps with 25 000 described species. Honestly, I think they were a very good choice for the main bad guys in the series, and were quite well described. Basically, these wasps reproduce in a bit gruesome way – they lay their eggs into a living host, which is then eaten by newly-formed larvae. Apart from this family, there also exists another similar wasp, called Emerald cockroach wasp (Ampulex compressa). This wasp, of the family Ampulicidae, injects cockroaches with it’s eggs; the peculiarity is that the wasp also injects the cockroach with the toxin directly in thoracic and cerebral ganglia, which prevents cockroach to move, effectively turning it into a zombie. It was explained that this is what happened in the Fortitude as well, the wasp larvae have taken control of human bodies, and they turned on people closest to them, when they felt threatened.

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Excuse me Sir, do you have time to help me search for cockroaches? (this is NOT an emerald wasp)

Photo by Wolfgang Hasselmann on Unsplash


All in all, I wouldn’t call Fortitude’s first season exceptionally bad, but I wouldn’t exactly call it good. They had some excellent moments, and the mammoth-wasp story-line was, in my opinion, on point, but was often overshadowed by multiple story-lines that don’t necessary bring anything to the overall plot. If you want to watch something that doesn’t require a lot of thinking, and can overlook some of the obvious biological mistakes, I would recommend it. However, I think it’s time that filmmakers educate themselves, or ask for help, when tackling topics they don’t quite understand.
(I read on Wikipedia that the writer did consult a parasitologist, which is probably why that part of the story functioned well; I don’t know why they didn’t do it for the other aspects of biology in the show.)

So, what do you think? Should we focus more on biology being correctly represented in popular media? Did you watch Fortitude – if yes, what did you think about it? Let me know in the comments below! 🙂

Biology in popular culture – neuroscience & movies

Hello everyone, and welcome to my new post! Yes, I’ve decided to try and write more often, and this time I will do a bit of self-promotion. As you may, or may not, know, I love watching movies – I think they are great past-time and I find them relaxing. Lately, I have had some troubles concentrating for more than an hour, but for now I would like to think that’s because I wasn’t choosing good movies to begin with. What does that have anything to do with neuroscience?

 

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Well, apart from writing this blog, I also write and edit for Gyrus Journal. Gyrus is student journal of neuroscience, where we write review articles about different topics: basic neuroscience, neurology, neurosurgery, and psychiatry. I have written some articles, and if you stumble across them, don’t judge me too hard – they are meant to teach us how to search databases, cite, and write in English, since our mother-tongue is Croatian. I feel very fortunate to be a part of this journal, since it helped me a lot in understanding of many scientific terms in English language, primary language of science; it also helped me to learn how to communicate with my authors, as well as how to dissect a topic I’m supposed to write/edit about. Of course, we also have reviewers, wonderful professors and scientists from University of Zagreb, who do the last editing before publication. (I would just like to say that we didn’t have reviewers from the very beginning, hence why some of the earlier articles perhaps lack in quality.) Lately, we have been struggling a bit with latest editions, but started to publish articles online – you can access them all on the link above. You can also follow us on Facebook page as well as Twitter!

A cover photo of the Gyrus Journal; light pink stylized brain surrounded by Gyrus logo and topics
A cover photo of Gyrus Journal


In Gyrus Journal, you will also find shorter articles and movie&book reviews, where title of this post finally comes in play! So far, I have written five movie reviews, with three still waiting to be published. For my first one, I picked the obvious choice: Memento (2000) by Christopher Nolan. Apart from being one of my favourite movies in general, I think it truthfully portrays anterograde amnesia.

In addition to portraying Leonard’s fragile mental state that makes us question not only his current objectives, but also whether his recollections of past are reliable, or simply figments of his imagination and almost fatalistic wishes, Memento is different in comparison with other films of similar genre, simply because it truthfully portrays the slow agony of losing the principal neurobiological process – a human memory.

You can access the full text here: Gyrus11-Memento

The second review I did was about movie that might not seem so obvious, but was quite intriguing: Side Effects (2013) starring Rooney Mara and Catherine Zeta-Jones. This movie also has a crime aspects but it deals with the psychiatric illness, for which we don’t know, until the very end, if it’s real or faked.

You can access the full text here: Gyrus12-Side-effects

Although dealing with semi-real thesis, the question still remains how the movie influenced real world cases. Did it help with recognizing the ones feigning the illness, or just put extra strain on the patients dealing with the illness that is already under deep historical stigma? Regardless of being the rather entertaining thriller, we are left wondering whether the movie deepened the negative view of the various psychiatric illnesses in the general public.

Three, still unpublished, reviews are:

  • 100 Minutes of Glory (in Croatian) – a biopic about famous Croatian painter Slava Raškaj, who was born deaf, suffered from depression, and lived her last days in Psychiatric hospital “Vrapče”. In Croatian, title of the movie is also a wordplay on Croatian word “slava”, her name; it’s literal translation to English is “glory”
  • A Different Brain – famed documentary by Loius Theroux; it follows four patients who suffered through some sort of traumatic brain injury and consequences it brings
  • Still Alice – movie that earned Julianne Moore an Academy Award for Best Actress, Still Alice is a touching but often times difficult story about a woman with early onset Alzheimer’s Disease

What about you? Do you like watching movies – which ones are your favourite? If you watched any of these, please tell me what you think! I would love to discuss movies with you & I’m really interested what you watch in your free time 🙂

RTŠB 2019 – biospeleology field trip – PART 2

I hope you liked part 1 of my biospeleology field trip in Slovenia, because here is part 2! Here I write about other days & share the rest of my experiences.

Day 5

The day started with making some spreadsheets and entering coordinates for various water springs. After that, we visited the Rivčja jama again, but unfortunately we found no Proteus (or anything else for that matter) in our traps. However, we found a very narrow entrance to the other part of the cave, aaaaand I got stuck. Like properly can’t-move-in-any-direction stuck. Most of you who never visited a cave probably wonder what kind of feeling that was. I don’t have a straight answer for that, since it’s more a range of emotions being experienced all at once; I wouldn’t describe it neither as panic nor fear, although parts of that were present. It was more a desperation that I’m not strong enough to wiggle out, mixed with frustration and adrenaline rush. I didn’t feel claustrophobia, but that feeling might sometimes be present as well. In the end, I managed to drag myself up that hole, and enter another part of the cave. Tjaša went even further, to my amazement, but I stayed back with Ester & Eva and collected as many pieces of another fox skeleton I could. This was was almost hole, but I only took few limb bones, skull, jaw bones, and vertebrate. *expect a video about it soon
After this ordeal, we went back to swimming in beautiful Krka and went back to school for quasi picnic (a barbecue on the school meadow).

cave
Inside of the cave


Day 6

Day six was day off; Bruno, Paula, and me went to Ljubljana and visited huge mall complex. Why? Because they have Whoop!, a trampoline park. In our defense, we were not the only adults there. After an hour, we went on our merry way to Burger King, and then a bit of shopping around. The most important thing I bought were hiking shoes. Paula helped me choose a pair (she specializes in orientation running, so knows a great deal about it), and they are pretty neat. But why Emina, why didn’t you already have ones? Well… That’s a long story, but I never had to walk this much before, and didn’t have to constantly change from my boots to rubber ones. So yes, before buying this pair, made for walking around in the forest, I wore my black combat shoes, with metal caps. One boot weighs almost 1 kg, so you can imagine how easy I suddenly walked everywhere. Just a note, specialized shoes exist for a reason.

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Wasp spider, Argiope bruennichi, in the grass


Day 7

On this particular day, I was on duty. I already wrote what that means, and it was exactly like that – preparing breakfast and making lunch&dinner. Nothing interesting happened, after my group returned we talked a little bit where they went, some determination of specimens happened, and we also had another lecture, about climate strike.


Day 8

This day was special because we were joined by Teo. I think he was Ester’s mentor for her Master’s thesis, but I’m not sure. In any case, Teo is an achieved biospeleologist and obviously knows a lot. First cave we visited, Jama pod Gradom, was nice, but I honestly don’t remember much, apart from the fact that we were walking around for kilometer or two, before realizing we parked in front of it. The second one, Blatna jama v Šici, was, to me, quite a difficult one. We spent more than 2 hours inside, climbed up, and down, and up and down, we crawled, and had to use the before-installed rope in order to pass some sections (not with equipment, just good old hold-the-rope and walk really closely to the rock). Well, the fact these were old lead to the unfortunate fact that Bruno fell in the water, after part of the rope tore. I wish I caught it on the video, but, by then, my camera was already completely out. We did caught quite a lot of Proteus, and I honestly didn’t realize how big they can sometimes be. *I have to check, but if the footage is salvageable, you can expect some kind of video
In the evening, I did some more determination with Anja & Tjaša.

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Did you know spiders can also live in the caves?


Day 9

First cave (Vodna jama pod Zijalom) was flooded, so we were hanging out in the front, trying to catch some more Niphargus (them) or taking videos (me). Then, we went back to Velika jama pod Trebnjem, the first one we visited and where we laid traps for infamous Leptodirus. Unfortunately, we found nothing, every trap was empty. Of course, we went back, and then some of us went looking for bats with bat group. This catch-mark-release activity has taken place a bit further from the school, near the small pond. The pond which also connected to a cave system, but had no entrance big enough for us to go in. So, two wild-life cameras were put up, as the word from the village was that at night, Proteus came out to play, um feed? Swim? Enjoy the moonlight? I’m still not sure, but next day I was told that they were captured on video. All-together, 23 bats were caught, with 10 different species being noted, which is a lot. Like huge, because when we first started, the bat group was optimistic with the estimate of “maybe 10 bats, and maybe 3 species”. I didn’t handle any bat, because 1. I don’t know how and 2. I have a perfectly rational fear of rabies.

 


Day 10

No caves today! I switched, and spent the day with amphibian group. And since it was the last day, we mostly chilled. We did try to visit one pond, but it turned out it doesn’t exist. The second one was actually really close to the cave I visited previously (Pekel pri Kopanju), and there we found quite a lot of frogs (all stages) and salamanders. Honestly, they looked really cute too! Afterwards, we went to Krka for quite a long time (*and quite a nice footage!). For dinner we actually had a whole dinner&party, but I had to miss that one due to migraine.


Last day was un-adventurous, we packed, ate a lot at McDonalds, and finally arrived home. And I’m looking forward to going again.
I would like to say a big thank you to Ester, Tjaša, Anja, Eva, Teo, and Živa, as well as our organizers.

RTŠB 2019 – biospeleology field trip – PART 1

Finally, I write about this astonishing field trip which has taken part from 17th to 27th July this year in Ivančna Gorica, a small town south of Ljubljana, Slovenia. Me and Bruno were part of biospeleology group, and my friend Paula, who was the only other participant from Croatia, was a part of reptile group. Paula has a nice Instagram page about biology as well.
This camp, organized by student’s biology group from Ljubljana is very popular with students from the ex-YU countries, and this year there were also colleagues from France. Also, being a biology student is not a must, we had humanities student as well.

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A detail from one of the caves

How does the camp work?

First, you have to apply; you can choose between three groups (my choices: biospeleology, reptiles, botany) and with the application you pay the 93€ fee that includes breakfast and dinner every day and driving around during the camp. When there, we sleep in our sleeping bag in the gym of the nearby school. Breakfast is every day 7-8.30am, and dinner was usually 4pm+. There was also one rest day (during which us three went to Ljubljana) and one day when couple of us were on duty – we were cleaning and cooking for that day.
One group usually consisted of 5 members, and every day we went out to field, trying to find caves or catch some cave dwelling insect.

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Our place in the school gym

We travelled, you guessed it, by train. I have already mentioned 9€ one-way-ticket from Zagreb to Ljubljana, and then we went to Ivančna Gorica, that ticket was around 3€. The way back was almost the same, with the difference we went by bus to Ljubljana, since there were no trains at that part of the day.

How was my experience?

Honestly, I would really like to go again next year, but honestly I don’t know how I made it. I was not in a shape I should have been, I had migraines, I got stuck, I had very suspicious bruises and I strongly disliked walking around under sun.

How many caves I visited?

Number of caves: 9
Total number of cave visits: 11
Number of water springs visited: 4
I also spent one evening with bat group & one day with amphibians group.

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Me, before first cave visit, unaware what was waiting for me

A short summary of my days in Slovenia

Day 1

We  met other members of the group: Ester, group leader, Tjaša and Eva. Anja was also part of our group, but she joined us couple of days later. Apart from going to the field, every evening we were supposed to try and determine our specimens we collected in caves, label them, and fill out special documents about our visit (who, when, why, where, what was collected and how).
We also prepared live traps for small insects. The traps we made consisted of putting tuna fish with gorgonzola in small tubes and closing them off with cotton pads.  The insect we were trying to catch was Leptodirus hochenwartii, member of Coleoptera, the only beetle that lives in the caves. This species is endemic to Slovenian, Croatian, and Italian caves. For other creatures we had prepared small tubes filled with 70% ethanol which we held in the pockets of our overalls, together with pincers.

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One live trap, buried in the ground – it also needs to be covered with a big rock.

Day 2

Frist cave we visited was Velka jama nad Trebnjem. The way up to the cave was steep and exhausting; it was very hot & moist in the forest. However, I took my camera with me, and took many pictures. I was surprised how many invertebrates live there, since Croatian caves I visited were almost completely empty. However, these animals are not usually found in the caves, here they are living kind of opportunistically, since the cave was also filled with garbage. We set up the traps for Leptodirus, and went back. We had a small lunch next to our car, and then went to the cave number two, called Rojska jama 2. We had GPS coordinates, but Ester was sure they are wrong (they were), so we asked a local villager for help. He kindly led us to the cave entrance, where we suited up, and in we went. The cave was quite interesting, we spent an hour or so inside. After we returned, mr. villager welcomed us back with home-baked strudels and soda. It was honestly, very nice. We also visited two water springs, and went back to the school. After dinner, Ester taught us how to fill out the papers I mentioned, and we tried to the best of our ability, determine all the specimens. The most important we had to discern were small freshwater crabs called Niphargus and Gammarus. The main difference is that Gammarus have eyes, and we really wanted to collect the other one.

skakavac
Caves were usually full of these grasshoppers, and they were scary huge!

Day 3

During day three, we visited one cave, Pekel pri Kopanju. We did find some cool animals, like Colembolas, but our trip was short, since main channel was full of tree branches and garbage. We tried visited the cave number two, but soon realized that we would need a 40m rope to climb down, so we gave up on that. We also visited two water springs, and headed back earlier, since one of the mentors had a lecture about global warming. After that, back to determination. We found some Niphargus (yay!), Gammarus (fine), and rat-tailed maggots. What are those, you wonder? Those are the larvae of certain species of hoverflies. What are hoverflies, you wonder? Those are flies that pretend to be wasps.

fly
The great pretender

Day 4

This day was tough for me, we walked 5-6km on the trails and through the woods, but we also visited three caves! First two (Dolnja vodena jama & Antokov skedenj) were close one to another and extremely spacious inside. I roamed around with my action cam (results were so-so, not enough light) and Bruno and me found a bunch of Niphargus in one puddle. I also saw some fox bones, and Ester was kind enough to fetch them for me! The third cave (Rivčja jama) was the one we visited three times all together and was really interesting. The walk towards it is around 1km on the forest trail, next to beautiful river Krka. The entrance to the cave is enormous – I would use the phrase “you need to be blind not to see it”, but that’s incorrect – even from the trail you can feel temperature drop and the specific smell of cave air.And this cave had bats. Bunch of bats (Myotis myotis), and they were loud, much louder than people would expect. We climbed up, on mountains of their poop, in order to take pictures, and the temperature soared at least 10 degrees there. Afterwards, we went through a narrow passage (here I took neat footage) and tried to catch some Proteus anguinus, the olm (I wrote about them here!). These traps were different, since they live in the water. We also tried to lure them with pet cookies (can’t remember if it was cat or dog food, sorry!).
After all this, we went swimming in Krka, water was around 15 degrees, but it was so nice and relaxing. The river is truly beautiful, and I would like for everyone to experience this kind of nature at least once in their life.

ich
The only not-blurry photo of me in the cave

End of part 1

I hope you liked this not-so-short overview of my time in this summer camp, part two will be up soon. Please tell me what you liked the most and about what would you like me to write more! I would like to thank all of you who read this, thank you for time and attention!

us
All of us; photo by Ester Premate

Another Vienna adventure!

Hi everyone, if you follow me on Twitter and/or Instagram, you have probably already seen my pictures from Vienna this last weekend. However, I would like to share a bit more, and write about it too!

At Saturday at 3.30 in the morning, my sister & me boarded the bus in Varaždin, and started our one-day adventure. Our destination? Vienna, capital of Austria! With the trip we booked through Galileo Travel came scenic sightseeing of the city, and a visit to Schönnbrun castle, but we skipped that and with U4 headed directly to city centre, Schwedenplatz more correctly. After short breakfast in McDonald’s (I know, I know), we headed to Natural History Museum. On the way there, we took some typical tourist pictures, in front of Stephan’s Cathedral, at Hofburg… And then we finally reached NHM.


I’ve visited the museum two times before, but my enthusiasm was still through the roof. Firstly, the museum is huge. Permanent exhibition spans two floors and numerous specimens. Roughly divided, first floor is mineralogy and second floor is dedicated to zoology. I took some pictures, which I will share with you, but I didn’t take my camera; everything is taken with my Huawei mobile phone.

Student’s entrance fee is only 7€ (~8$), and taking photographs is allowed. The whole museum is, honestly, overwhelming. I have never before seen so many specimens at once place. My sister, who visited it for the first time, often commented that a building itself could be a museum, due to it’s rich, ornate walls. First floor is, like I already mentioned, full of minerals. I don’t have much interest for them, but I made me think about how old our planet is, and what makes it. Also, one of the rooms is completely dedicated to jewellery, both modern and historic.

The floor dedicated to zoology was full of models and real specimens of animals around us, as well as evolutionary artifacts. As is common, first rooms were dedicated to invertebrates, building it’s way up to vertebrate groups. I was particulary amazed by the size of dinosaur bones – no matter how many times I see it on the TV, or visit this museum, I stand in awe in front of them.


Unfortunately, due to morning sun, I wasn’t able to capture nice photographs of invertebrate collections, but trust me when I say those are so beautiful. Everything is o neat and organized that, since then, I’ve been toying with idea of collecting my own specimens. There are also rooms dedicated to fish, amphibians, reptiles, birds… Those are usually held in special containers or stuffed. There are also many skeletons on display on the walls. With dinosaurs, there were also animatronic models, which both excited and frightened children in the museum.

Latimeria
Latimeria chalumnae, a living fossil!


There is also a separate room dedicated to evolution of human. I already posted that interesting picture where an app transformed me into an early human, but in this part of the museum, you can see many different skulls belonging to Homo sapiens, Homo neanderthalensis, Homo habilis… I consider this part of the exhibition very important, especially in today’s time, when so much misinformation is present on the Internet.
Another important historic specimen is Venus of Willendorf figurine, which is dated to 30 000 years BC.

Venus
Venus of Willendorf

 

What would you like to see, if you could go to Natural History Museum in Vienna? Would you like me to write about something in more details?
Please let me know in the comments 🙂