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The Hillock at Canet St Nazaire

31/3/2015

2 Comments

 
by Lesley McLaren  

Last Thursday was cold and not very spring-like, thanks to the fierce north westerly tramontane, but when I received an excited message from Isobel, saying she'd just seen an osprey, sixteen black kites and another big, unidentified raptor, all from the dual carriageway between Argelès-sur-mer and Perpignan, I was reminded that the spring migration was well underway; that strong wind was bringing them low. For some reason I usually miss most of the migrants at this time of year, but there was clearly a lot about that day and, after several months of finding little or nothing to report from the natural world, I was suddenly keen to get out there.

Ospreys! Last time I saw one of those was 1997 (in Florida - where they nest on roadsigns over motorways!). So where best to watch all this feathery drama close to home?

Internet research led me to a hillock between the village of Canet St Nazaire and the west side of the lagoon that Robin has blogged about previously. It's here where members of the local ornithology association, the GOR (Groupe Ornithologique du Roussillon) have been counting migrants - from chaffinches and wagtails to kites and cranes - since February. The "season" will last until about mid May, with the arrival of golden orioles and - last of the raptors - honey buzzards. Click here or see links below to websites for the GOR and Migraction (for details of sightings).

So I joined them for a few hours on three consecutive days...
Picture
The hillock is neither remote nor camouflaged. On the north western edge of the protected reserve, it's only about a hundred metres away from houses. There's no cover; migrants can see you as well as you can see them, but for the most part they seem untroubled, focused as they are on the long, exhausting journey north.

Days one and two, the tramontane is blowing so violently it's impossible to hold the binoculars still and most birds are sensibly sitting it out - probably in their hundreds, just the other side the Albères in Spain!

Rightly or wrongly I can't get so excited about the smaller species, although I understand the importance of recording numbers for ecological monitoring purposes. And, as Robin has rightly pointed out to me before, diminishing numbers of small birds will result in diminishing numbers of their predators. We need to know what's going on. What I'm really hoping for, though, are those large raptors. If I had a powerful telescope I could see what's coming from a great distance, but for me to positively identify much through my binoculars (good though they are), everything needs to be reasonably close. To watch raptors really low, these guys tell me, I'll need to be on the hillock for the first hour or so after dawn - while it's still too cold for them to gain much height.

Picture
I don't quite manage that this week but, despite arriving around lunchtime each day, I'm lucky enough to watch dozens of black kites and marsh harriers at close range, and after this "immersion" consequently  feel much more confident about identifying them in the future.

(Sorry, but my camera can't do bird photography, so these are all landscapes!)

In fact I saw my first ever marsh harrier earlier in the week, close to home when walking the dog. I'd just got it in the binoculars - and had decided this beauty wasn't a red kite after all - when a shot rang out close-by. I half expected to see the bird drop from the sky, but, happily, it continued to quarter the field in front of me. Worried that someone might be targeting these magnificent birds of prey, I decided to investigate, and set off in the direction the shot had come from.

After crossing a stream, I entered a field - vines to my right, oak trees and scrub to my left. In the winter I'd seen hunters among these trees before, hoping to bag rabbits or partridge. A hundred or so metres further on, I caught a glimpse of a figure in there. When I came up behind him I read "Police Municipale" on the back of his jacket: a policeman from one of the nearby villages. Was he investigating too? I shouted hello and, surprised, he emerged from the bushes, clutching ... a bunch of wild asparagus. When I asked him about the shot just moments ago, he claimed not to have heard it but told me what I already knew - that la chasse was over.

I digress. Returning to the hillock: marsh harriers are so smart - the males with their grey, brown and black markings, and females with their pale golden heads and shoulder patches. Every few moments one or more glides below us, across the tall straw-like grasses or over the water beyond. Fantastic to watch them from above as well as below. I'm on a high -

- and then a cry goes up: "Busard St Martin!"  Hen harrier - male! - skimming the water left to right. Everyone turns, there's a scramble of feet, tripods and telescopes ... it's heading for the poplars ... "Non, c'est un pâle!"  Not a hen harrier after all, but a true rarity:  the Pallid Harrier. I wouldn't have known the difference (both being grey-backed with black wing tips) but these guys know their stuff, so I'm happy to be guided by them.

Picture
Later, Anthony - one of the official recorders for the GOR - tells me an osprey is approaching from the Albères hills. He points to a fluffy white cloud in the far distance. The bird is high - I can just make out a silhouette through my binoculars - but it'll be here soon, he says. And he's right. Gradually, down it comes, and I get great views for several minutes as it checks out the lagoon before continuing its marathon. Wondering how much further it has to go and where it will end up, I wish it a safe journey.

In stark contrast to some of my fellow ornithologists using telephoto lens cameras to shoot birds on the wing, occasional gun shots can be heard in the distance. The targets are wood pigeons, someone tells me, with a despairing shake of the head. That solves the mystery earlier. Other birds, especially raptors, are protected, and all shooting - even of those pigeons - ends on 1st April. Hurrah!

Picture
On day three, moody clouds form around Canigou. The wind at hillock-level is less fierce, there are many more birds about, and more watchers too - eight or so in total.

I'm the only foreigner but they're a very friendly, welcoming, informative bunch, and I'm gradually brushing up on French names of birds. Between noting alpine swifts (easily mistaken for a falcon at first glance), chiffchaffs, a distant spoonbill and short-eared owl, a hen harrier or maybe another pallid ... they tell me that for every female marsh harrier we see, there will be several males - relatively few females and immatures migrate; they invite me to look through their telescopes (unused to this, I can't focus on anything!) and there is general banter. But we all fall silent when a flock of fifty or so white storks reaches the hillock and flies low overhead. And as these elegant birds continue to wheel around us in a beautiful aerial ballet, I feel a stillness inside - a moment of intense peace.

Nature can be fierce, cruel, shocking. It can be wondrous and soothing. It's all around us, all the time, doing its thing - even during those winter months when there seems to be nothing going on.

I can't wait for the honey buzzards in May, having only ever seen one I could be certain of, a couple of years ago. But I shouldn't wish time away. Early April, I'm told, is the best time for booted eagles. There might not be that many flying along the coast (far more further into the Pyrenees, of course) but it's another raptor I'd really like to familiarise myself with. So, if weather conditions are right, I shall be returning to this interesting local hillock very soon - around dawn.

Links:
Groupe Onithologique du Roussillon: gorperpignan.pagesperso-orange.fr
www.migraction.net



2 Comments

Dragonfly Differences

10/3/2015

1 Comment

 
Large vs Small Pincertails (Onychogomphus uncatus vs. forcipatus)

My first interest in dragonflies came from their often vivid colours, and the sheer difficulty of photographing them in their swiftly-moving, jerking flight patterns. They are one of the very few animals that can fly up, down, backwards, forwards and sideways.

I have become fascinated by the sheer difficulty of distinguishing one species of dragonfly from another. Despite helpful pictures in many books, it can often be hard to make a good and accurate ID.

In an earlier blog "Oh! So Similar" I talked about the way that many dragonflies at first seem to look so alike. Now I am going to look at two species of dragonfly that are very like each other and show what I feel are good ways of telling them apart. The species is Pincertails (Onychogomphus in Latin).

This commentary covers only Pincertails found in the Mediterranean area of S. France that lies at the foot of Les Albères in the Pyrenees, near the river Tech.

There are two species of Pincertail (Onychogomphus) in this area - Large and Small Pincertails. They are called Pincertails because of the eye-wateringly substantial male appendages; these are used during copulation by the male to grasp the female. Telling the difference between Large and Small can be tricky as the overall sizes of the two are not all that different.

Picture
Large Pincertail male (Onychogomphus uncatus)
Picture
Small Pincertail male (Onychogomphus forcipatus)
Picture
The male "Pincer Tail" - Small Pincertail (Onychogomphus forcipatus)
I have found the Large Pincertail to be the less common of the two, having only seen 2 examples. It appears they are less plentiful in the lower reaches of rivers, existing at heights of up to 800 metres, and as a species is rarer than the Small Pincertail.

The Small Pincertail has three subspecies, of which only one is found in this area  (Onychogomphus forcipatus ssp. unguiculatus). All O. forcipatus pictures in this blog are of the subspecies.

In telling the difference between Large and Small there are three (fairly) visible markings which are usually straightforward to identify and are diagnostic.

Starting at the front with the first of these diagnostic markings -

In the Small Pincertail (O. forcipatus) the vertex - the black area between the eyes - has got a small yellow mark.

Picture
Small Pincertail (O. forcipatus) yellow vertex mark
The Large Pincertail (O. uncatus) has an all-black vertex.
Picture
Moving back a little for the second diagnostic marking -

Both species have a yellow collar at the front of the thorax (not always easy to see). In the Large Pincertail this is broken by a black bar. 

Picture
Large Pincertail (O. uncatus) Yellow collar broken by black line
The Small Pincertail lacks this black break.
Picture
Small Pincertail (O. forcipatus) No break in collar
Finally the third diagnostic marking -

In the back wing, both species have got a triangular area close to the body at the rear of the wing called the anal triangle.

In the case of the Large Pincertail male this triangle contains four cells...
Picture
Large Pincertail (O. uncatus) Four cells in anal triangle
....whereas the Small Pincertail male's anal triangle contains only three cells
Picture
Small Pincertail (O.forcipatus) Three cells in anal triangle
There are other markings that can be used or ID, but in the pincertails I have seen these are either quite variable and therefore not really diagnostic (see below) or require the dragonfly to be caught for detailed observation (for instance tiny differences in the tail pincers).

In the case of the Small Pincertail below there are two curving black lines running front to back on each side of the top of the thorax; these should be joined about half way along by another curving black line. On one side the line clearly joins but on the other not very clearly.

Picture
Small Pincertail (O. forcipatus) Do the lines join?
A comment on nomenclature.
In the case of many dragonflies there tend to be different English names for each species. These vernacular names need to be as user-friendly as possible. The names proposed in a classic reference work by Klass-Douwe Dijkstra (K-DD) - "Field Guide to the Dragonflies of Britain and Europe"- are becoming widely preferred, mainly because they are more descriptive. The British Dragonfly Society (BDS) names can have a more regional focus.

For example the Small Pincertail (K-DD) is also called Green-eyed Hooktail (BDS); in our area these have blue eyes (a Mediterranean trait, see photo above), and the name Hooktail is less descriptive than Pincertail.

Elsewhere in the world (e.g. USA) names can yet again be different. There is a need to standardise international names for European species, and currently we are seeing polarisation rather than consensus.

The definitive name is always the Latin one. Even so, this is not always clear as there is discussion on which species a dragonfly belongs to (especially in the case of sub-species - is it a variant of an existing species, or an evolving/evolved new species).

Dijkstra                        BDS                           French                               Latin

Pincertails                    Hooktails                     Gomphidé                           Onychogomphus    
Large Pincertail             Blue-eyed Hooktail       Le Gomphe à Crochets        Onychogomphus uncatus
Small Pincertail             Green-eyed Hooktail     Le Gomphe à Pinces           Onychogomphus forcipatus


Challenging photography....
It is quite clear that making a good ID requires detailed observation. Many of the details are not possible to see without first catching the insect, either because what you want to see is very small or just hidden away from view. I never catch dragonflies; my wish is to leave them as undisturbed as possible. This means that I rely on photographs.

The trick is knowing which anatomical parts of which species require  detailed photos - and then getting into a position where one can get the shot. Even the most approachable of insects will tolerate only a limited amount of photographic time, and there are many which are either very shy or on the wing most of the time. Bearing in mind that the feature one is trying to photo may be only a fraction of a millimetre in size, awkward to view and obscured by foliage, and one can understand how challenging it is!

To come....
The next blog in this series will be looking in detail at a small and dainty damselfly - the Featherleg (Platycnemis). There are three species of Featherleg in our area, but two of them are really difficult to sort out - especially the females.

A further blog will look at the habitats these delightful creatures live in, how difficult it can be to get the "right" photos and ways to tackle the problem.

1 Comment

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    Isobel Mackintosh
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