Every Breath You Take

I thought that as we walk down the next part of the gully we’d have a look at air – there’s some, look, right in front of your nose. You can’t see, smell, taste or touch it so what exactly is it? Mainly it’s a mixture of two elements (not a compound – they don’t combine together). The two elements are Nitrogen (78%) and Oxygen (21%). The other 1% contains other elements, primarily Argon.

Rosularia serrata

Every breath you take (don’t worry – I’m not going to start singing again) is for the most part Nitrogen, a vital element for us but the problem is; we can’t use it directly. We need plants to do a bit of work for us like this Rosularia serrata here. It can’t use Nitrogen from the air either, it needs help from special bacteria in the soil that use enzymes to convert the nitrogen into organic compounds that it takes up through its roots. We, and other animals, can then take the nitrogen that we need to produce things like essential amino acids from the plants that we eat. When it, and we, die we pass the nitrogen back into the soil for reprocessing by bacteria. 

Ferns and Mosses

Air hasn’t always been air as we know it today and if we go grubbing about down there in the dark and damp bits we should find a couple of the major players in the events that led to the breathable stuff that we enjoy today. About four hundred million years ago, when these ferns and later these mosses, were the pioneering land plants oxygen was only running at about 15% but plants, as we know, give off oxygen as a by-product of photosynthesis and over the next hundred million years levels built up to about 35%, an abundance that gave rise to giant dragonflies and things. The rise of oxygen breathing animal life brought the levels back down to a range which we’ve evolved to function in which is about 19-24%. 

Darkling and Rosemary Beetles

We seem to have come out into the open air as it were and it looks as if we’re at the head of the oleander highway (see Into The Woods) so we should be able to find some nice insect life in there. We have beetles in abundance. This beefy, black job is the brother of the one we found a couple of weeks back up the valley. That one was Raiboscelis coelestinus with the blue sheen and this one is Raiboscelis corvinus. The other two are Rosemary Beetles, Chrysolina Americana, and they seem to be thinking about expending a bit of energy to make more Rosemary beetles. Which brings me back to oxygen. The reason why it so important to us and all other animals is that we need it to convert glucose into energy in a complex process called catabolism^[1]. Simply put, we couldn’t move a muscle without it.

Ant nursery

Apart from the composition of air there are two other aspects of it that are important and those are its temperature and humidity, a delightful illustration of which you can see by looking under this rock that I’ve just turned over. The little white cocoons that the ants are fussing over are the larvae.  These, along with the eggs, they constantly move from one place to another within and just outside of the nest to regulate their conditions as the temperature and humidity fluctuate throughout the day and night. They really are the most dedicated of nursemaids. But now it seems we have reached a defile through which we cannot pass, not without ropes and crampons anyway. I suggest that we walk back over the hill, down through the village of Agios Ioannis and pick up our route again a couple of hundred feet lower down.

Cumulus and Cirrus clouds

Just look at that wonderful cloudscape above us. The large, fluffy one is a cumulus cloud (from Latin, meaning heap) while the streaky ones above are cirrus (from Latin, meaning a ringlet of hair). There are sixteen major cloud types in total, all of which contain water vapour in varying amounts evaporated from the Earth’s surface. You may be wondering; if air is 78% nitrogen and 21% oxygen how come your hygrometer says that its 60% water? Firstly it’s because those percentages are for perfectly dry air and secondly that your hygrometer is measuring relative humidity; the partial pressure of water in the air compared to what it could be if it was fully saturated, and not the actual amount of water in the air. Which is a good indicator of whether it is likely to rain or not and thus of far more practical use as a measurement.

So that’s air, in a nutshell. Meanwhile I think I can see the village below us so we’ll explore that next week.

The Extra Bit

Last week’s marmalade recipe seems to have gone down well so I may well do another in the New Year. Meanwhile if you want to know more about how we convert the sugars in the marmalade into energy then you can read all about it here: ^[1] https://en.wikipedia.org/wiki/Catabolism

I've just started a magazine called The Nature of Crete on Flipboard. Eventually it will not only contain links to the latest blog but other articles and blog posts about the flora and fauna of the island. If you'd like to read it and maybe even contribute a link then this is the web address: The Nature of Crete 

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LINKS:

Naturalists (the facebook page that accompanies this blog)

See detailed pictures at http://www.inaturalist.org/login  (search - people-stevedaniels-observations)

Cretan Flora

The Nature of Crete  (Flipboard Magazine)

Flowers of Crete;

BIRDS OF CRETE

Crete Birding

Greek Butterflies and Moths

Aquaworld Aquarium

Visit Greece (National Government Tourist Office)

In The Arms of Giants

Did anyone think to bring a bullwhip? A pity because after last week’s leisurely stroll Along The Ardefsi I have a feeling that today’s excursion is going to be a bit more Indiana Jones. Our objective, ladies and gentlemen, is to examine the area around and on top of that grasping claw-like edifice down there. There’s a second one in the distance, beyond the ardefsi. It’s not hard to imagine one of the Giants of Greek mythology, Pallas or Porphyrion say, taking a breather during their battle with The Gods and resting here with his hands upon his knees, gazing out to sea wondering how and when the battle would end. From such landscapes were the Greek myths concocted. The Giants lost by the way, after a bit of chicanery from Zeus prevented Ge from finding a magic herb. Anyhow let’s get down there and see what magic herbs and other wonders of nature we can locate today.

Darkling Beetle, Lower Chafer and Long-horned Beetle

Now somehow we’ve got to find a way up there but before we do it seems we are in the middle of a beetle drive. Firstly, when we left the road we had a little Darkling Beetle mooching about on that parasitic Dodder plant that we came across a couple of weeks ago (rather worryingly it has now spread to a second clump of Cretan Ebony thirty paces further down the hill). Then, here on this Cistus we have a Flower Chafer, a name it derives from the Old English word ceafor meaning beetle. And finally, our friend from last week, the Long-horned Beetle tucking into another Asphodel. Three beetles from three different families, that’s a good start to the day.

Honey Bees on Sage

Well, that wasn’t too bad was it? Now we’re up on top of the Giant’s hand the views are stupendous and the air is full of the scent of wild herbs and the soft drone of pollinating insects. It seems as if we have entered a honey factory. It’s this purple flowering Sage that seems to be attracting the Honey Bees. Not all bees make honey of course; of the twenty thousand or so known species of bee there are only seven species that make the honey for our table.  The sage that they’re working on is a wonderful plant. Apart from being a delicious accompaniment to pork dishes it has been recommended for virtually every ailment known to man at various times. Even its scientific name, Salvia, comes from the Latin salvere meaning to save. Modern research has proved it to have many useful properties from anti-sweating agents to blood fat reduction through to the management of mild to moderate Alzheimer’s disease. Perhaps this was the magic herb that Ge was looking for before Zeus thwarted her plans.

Great Tit in the Pines

Let’s leave the honey bees to their industry and go and rest awhile in the shade of the fir trees. Isn’t it amazing how they seem to grow out of solid rock? Lying here is like listening to nature’s orchestra with the bees providing the bass drone, the crickets and grasshoppers on percussion and the birds providing the melodies. The greenfinches and the chaffinches counterpointing one another and the loud pitchoo of the great tit providing the main theme.  It’s strange; although the Great Tit is quite common in these parts I’ve never seen a Blue Tit down here. I’ve seen them in Rethymno and on the Omalos Plateau but never here in Lassithi.  I wonder if there is a line across the island beyond which they will not venture.

 [A quick survey for those of you who live on the island – let me know where you do see (and where you don’t see) Blue Tits on Crete and I’ll try to build up a map.]

Mediterranean Slant-faced Grasshopper Nymph

If we stroll along the Giant’s forearm towards its elbow, as it were, I fancy we’ll find a somewhat less arduous way of getting back to our start point. Quite a few more orchids among the stones here and a little Restharrow I haven’t seen before… and who’s this lurking at my feet? A young Mediterranean Slant-faced Grasshopper. Do you remember the cheeky adult which perched on my pack up at The Hidden Plateau? This is a youngster of a closely related species. Between egg and adult insects have two different ways of growing up. Some, like the beetles and butterflies hatch into larvae and eat like mad for a bit before going into a sort of suspended animation called a pupa where they change their body shape completely. This is known as complete metamorphosis. Others such as grasshoppers and crickets don’t entertain all that palaver but hatch as miniature adults, gradually changing their appearance in a series of moults as they grow bigger. This is known as incomplete metamorphosis. The various stages are called instars and, particularly the late instars when they are almost fully grown but look quite different to the mature adult, can fool you into thinking that you have found a completely new species. So we’ll photograph this little chap and add him to our species record for future reference. So, a pleasant perambulation back through this garden of The Gods and then a little lunch somewhere I think.

Until next week – happy hunting.

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With special thanks this week to Michael Geiser,  Cosmin Manci and Apostolos Trichas of the  Coleoptera Group for providing me with detailed information on the various subfamilies of the Tenebrionidae Darkling beetles and also to Axel Hochkirch at The Orthopterists' Society for recognising the Mediterranean Slant-faced Grasshopper nymph and suggesting the species.

LINKS:

Naturalists (the facebook page that accompanies this blog)

Flowers of Crete;

BIRDS OF CRETE

Crete Birding

Greek Butterflies and Moths

Aquaworld Aquarium

Visit Greece (National Government Tourist Office)