Latouchella

About Natural History

Riddle riddle…

I was introduced to this yesterday, and I cannot stop thinking about it… I haven’t found the answer to the first clue – at least not yet, so I hope anyone who reads this will. Be careful with the instructions though.

 

http://www.Twelve-Clues.com

International Conference on Bear Research and Management

International Conference on Bear Research and Management

What a wonderful surprise! Instead of coming across a fossil while surfing at the office, this morning I found this conference that will be held in Thessaloniki this fall. It regards the interactions of humans and bears, and the conservation of species in today’s industries and economies. It also comprises a field trip to one of the most beautiful villages in Greece, Nymfaio, where ex-captive bears live (in the forest nearby).

Nymfaio village

Nymfaio village

For more information: http://www.iba-greece-2014.com/

Why ferns are awesome

There are several reasons why one might like ferns. They are moslty known for beeing very green, bearing nice leaves, and thus serve decorative purposes. Some other times they are use as a basis for medicine. Unfortunately, they are not plants that are as much admired by the world as they would deserve.

For the biologists’ eye, the first fascinating thing about ferns is that their stems grow below the surface, and their roots are not parallel to this structure like they are for trees (in general) but perpendicular to the totality of the stem as shown in figure 1 below.

Fern

Figure 1: Schematic anatomy of ferns.

Another notable difference is the structure of the cells that are involved in the sexual reproduction: they are not part of the main plant (like the case of flower-bearing plants, Angiosperms), but they form another, separate, plant -the gametophyte- that consists of cells with one representative of each pair of chromosomes (haploid state) (figure 2).

fernlifecycle

Figure 2: Life cycle of ferns.

These are things that we learn during the first year of biological studies. For me though, the most amazing thing that characterizes ferns in general, is the fact that unlike pines and flower-bearing plants (Conifers and Angiosperms), their vascular system is in the center of the leaves, the rhizome and the roots. This characteristic feature isn’t found in many other type of plants today (considering that bryophytes do not have a completed vascular system), but could be found in numerous other plants that have disapeared mainly after the end of the Permian era. Also, the structure of the vascular system varies between different taxa. This is something that attests to the exploration of these plants in order to find different solutions for the transportation of water and nutrients from one part of the plant to another. And we are able to see the traces of this exploration that took place very early in the evolution of ferns, not by time travelling but by observing today’s plants. A wonderful group of organisms!

This is Charles Lyell

Why should we talk about Charls Lyell? Well he was one of the most important scientists that drew attention to his discipline as well as a great thinker of his time. Unfortunately, most of the time we are told that he influenced Charles Darwin, A. R. Wallace, T. H. Huxley and R. I. Murchison, but how and why?

charles-lyell-5

One thing Lyell (1797 – 1875) is known for is that he wrote the book that really founded modern Geology: “Principles of Geology“. But how did he get to be interested in Geology in the first place?
He studied in Oxford, graduated around 1820 and started working as lawyer. During this time he travelled around England, thus being able to observe geological formations. He was so fascinated by geology that even during his honeymoon in Switzerland and Italy, he and his wife (daughter of a member of the Geological Society of London) did a geological tour of the area.

His best known work is the book “Principles of Geology” which is itself known not only because it is important, but also for inspiring Darwin in his work.

lyellprinciplesgeology.1

First Edition of the “Principles of Geology”

He had the vision and the ability to think a bit beyond a simple landscape, and, having in mind the works of James Hutton, was able to find an explanation for the deposition of geological layers. The central argument of the Principles is that of uniformitarism, and in his own words he made “an attempt to explain the former changes of the Earth’s surface by reference to causes now in operation”. And this is what makes his works and way of thinking absolutely modern.
Another important part of his work was in Stratigraphy – I believe this is his most important contribution to Geology. He travelled through Europe, studied and described many formations and he kept updating his Principles with the latest works until the 12th edition of 1875.

His interest and work on Evolution is also something we should remember: he endorsed both Darwin and Wallace in their works, as he was already a well respected scientist in the United Kingdom.

He died two years after his wife, in 1875, and was buried in Westminster Abbey.

Mount Olympus

So many mountains where you can go hike in Greece!  Here is a video of some friends on Mt Olympus in August!

Shells and Bones?

Could anyone imagine that a world in which no skeletal parts would exist could replace the world as we know it?
Well it already has existed, in fact this was the world during the whole of the Precambrian.

Do we not take all the skeletal parts for granted? Most of the time, the animals that surround us, that we notice the most, are composed of one sort of skeleton or another. Cats, dogs, snails, chickens… all have a kind of skeleton. But how often to we think about why do we even have hard mineralized bones? How are bones and shells made? Why do not all animals have it?

During the last couple of decades research on the topic of bio-mineralizations, or how do organisms create hard parts, has taken off. The major axes of interest are the mechanics and the genetic signal and control of the elaboration of skeletal parts in animals, the functional history of these genes etc.

Before the Cambrian, many animals existed as attests the famous Ediacara fauna, and it is believed that many more must have existed but we have no fossils to trace. The main reason for this is that these creatures did not possess skeletal elements, therefore making the fossilisation process extremely unlikely. The other consequence is that it is very difficult to assess the biodiversity of the Precambrian. And one very interesting problem arises: the Cambrian explosion cannot be seen as a real explosion of life, a moment of rapid diversification of life.
Indeed, for a long period of time – and today still, the Cambrian era was considered as the time when biodiversity increased considerably in a very short time lapse, simultaneously with the first appearance of skeletal parts. For this, it is only logical to believe that the genes must have existed previously to the “explosion” itself. Questions rise as to the true nature of the beginning of the Cambrian; it seems to be more of an extinction crisis: the organisms that weren’t able to keep up with the new technological advancement of the skeletal parts, and the first known predation advancements that also occurred during the Cambrian.

© SWEDISH MUSEUM OF NATURAL HISTORY. PHOTOS: STEFAN BENGTSON.

Early tube-dwelling Cambrian animals. © SWEDISH MUSEUM OF NATURAL HISTORY. PHOTOS: STEFAN BENGTSON.

Many things we do take for granted but do not stop to think about why and how they exist, and yet so many questions and mysteries lie in their study.

Counting life

What do most people know about the field of Systematics? When I tell someone in Greece that Systematics is an important and very interesting field of biology, they mostly ask me “the systematic study of what?”. How does it help and what does it do? I am only going to focus on the basis of this science and on how it is linked with museum collections.

We are used to hearing biodiversity questions and how species preservation is crucial in the current ecological disasters. But what is biodiversity and how can it be counted? How is it possible to know if it is increasing or decreasing? How does one know if the changes observed in a small-scale are significant or if similar changes have occurred in the past?
Systematics is the science that defines species and inevitably counts them. The criteria are brought by some rules (Nomenclature), recommendations and the art of defining species (Taxonomy).

While talking to a friend of mine who is a collection manager in the Natural History Museum of Paris, I thought of this: say that it’s not possible to travel the world collecting specimens and seeing specimens in museums – rather realistic in the current economy context. It then becomes crucial to be able to use museum collections that others have put together so carefully. It is all the more important in order to be able to understand the history of each species that we study, its range of morphology, its name attribution etc.

Furthermore, in order to count today’s biodiversity, species need to be defined and this is the first reason why museum collections are important: previous studies or their absence help but also prevent one from making a mistake (naming a species that already exists).

Is it not a shame that most people are not aware of what collections are and what purpose they serve? It is not just for the glory of having the largest collections, they are valuable for many scientists. Sometimes it also happens that new species are discovered while searching old collections as it happened for Xenoceratops foremostensis.

So let’s pay more credit to all precious collections worldwide, unfortunately a lot of them are in poor shape because of the lack of financial support as far as their maintenance is concerned.

On teachings

carl_sagan

A Safe Haven for Wild Birds

A Safe Haven for Wild Birds

People will go crazy during the “hunting periods”, wether they’re legal or not. Some of them even think that hunting can be qualified as a part of natural selection since they claim that it is the fittest who survive – it’s more of a struggle for life really. Several locations in Greece are very well known for being visited by birds during the spring, that come from the Saharan desert to rest before they reach parts of Northern Europe to reproduce.

I found this campaign this morning, that should do a major job for limiting and reducing illegal hunting in the Ionian Islands. Please take a minute to look at it and share (click on the title of this post).

Did you know that every spring wild birds make a courageous thousands of kilometers journey in order to migrate with almost no stops to sleep, rest, feed or drink?

Did you know that a significant percentage of them never make it to their destination due to exhaustion and starvation?

Did you know that, every spring, the birds that survive to land in the most beautiful stop over sites in Greece, the Ionian islands, get shot and never reach Northern Europe in order to reproduce?

Did you know that hunting during spring has been banned since 1985, but it is still not properly enforced in Greece?

Well… If you help us raise sufficient funds for our “A Safe Ηaven for Wild Birds” campaign you and thousands of others will find out and put this illegal and catastrophic activity where is belongs: in the past!

Greek bears

A few months ago a couple of little orphan brown bears were released in the forest and are still beeing monitored to see if they are making it!

http://www.youtube.com/watch?v=h7kMBHrUBuk

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