Osprey navigation paths

Intro>>

The Rutland  (England) Osprey Project has been running for 18 years when Ospreys began to breed again on Rutland Water in the UK after 150 years.

These birds are cared for by the Rutland Osprey Project who have fitted GPS trackers to some of these birds which give very accurate and detailed data of exactly the track the birds take on their migrations.

They tracked their Ospreys to their wintering grounds on the Coast of Senegal (Africa).  They migrate southwards in Autumn and return to the UK to breed in the Spring.

Recently bird “30” flew from Rutland to Senegal, a distance of 2912 miles (4686 kms), in 267 hours.

There is very detailed information about the Ospreys and their migration on their website: www.ospreys.org.uk

See

  • Satellite Tracking map
  • Osprey team latest – there is lots of hard data at the bottom of this post

It is fascinating as the birds fly on very similar paths each time they migrate.  You can see in detail exactly where they went.

Do they follow Osprey “flyways”  which they can sense?

Richard Nissen
Autumn 2014

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Migration of Banded Stilts from Australia

There was a recent article in the media, including the New Scientist and the Times about the migration of the Banded Stilt, which seems to migrate very fast at short notice.

The recent interest has been triggered by work done at Deakin University in Victoria Australia by Reece Pedler. Banded Stilts normally live on the coast but when the rains come inland they cause huge salt lakes to occur. The Banded Stilts respond to this very fast in order to feed on the brine shrimps that hatch in these lakes. This triggers the breeding season for these birds.

Here is a link to an Australian media report: http://www.abc.net.au/news/2014-02-21/banded-stilts-migrate-to-kalgoolie-after-heavy-rain/5275542

Please see the link below that covers Pedler’s work and explains his methodology etc: http://rsbl.royalsocietypublishing.org/content/10/10/20140547

Please note that other commentators have queried whether the Stilts could actually fly 2200 kms in 2.5 days.

Pedler admits that it is a mystery as to how the birds know when to set out.

Richard Nissen
Editor

 

 

 

 

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Avian navigation

Intro
This piece has been forwarded to me by one of our editors: Simon Raggett. He gives us the quantum twist. You will also find much written here on the subject of avian navigation based around gravity from our editor Antonio Nafarrate, who has been in communication with the authors of this piece. Please follow the link below.

Richard Nissen
Editor

>>>>>>>

A curious finding is reported in the 15 November New Scientist. Trained homing pigeons became disorientated when flying over a crater where the force of gravity was lower than normal.

Gravity is the weakest force and the intermediating particles are undiscovered, the force usually being understood in terms of the curvature of spacetime. Our normal understanding of brains does not allow for detection of presumably very minor fluctuations in the gravitational field, but it can be speculated that the radical pair entanglement in avian brains might somehow be up to this. It might also be worth considering that water courses, mineral deposits etc might create fluctuations in the gravitational field.

The reference is Journal of Experimental Biology, DOI: 10.1242/jeb.108670

https://www.google.co.uk/?gws_rd=ssl#q=Journal+of+Experimental+Biology%2C+DOI:+10.1242%2Fjeb.108670

Simon Raggett

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Traditional Shepherding and Transumance in the Cevennes

Transumance  is the seasonal movement of animals from the lowlands to high pastures for the summer months.

This article and images come from witnessing Transumance in the Cevennes each year and talking to Annie Lashermes whose flock it is. The tradition of Transumance goes back millennia.

Richard Nissen
Editor
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Transumance routes

Transumance

A shepherd with his typical umbrella just starting off on his journey with the flock up to the high pastures in June

photo

The leading ewes, who are seen by the shepherd as the most responsible and have made the Transumance journeys before, are marked with pom-poms and are the leaders of the flock on journeyphoto

Transumance4I often visit a community in the Cevennes, which is in the South of the Massif Central in France. This is a little village called Saumane near St Jean du Gard,

The Cevennes is a very mountainous in that it has steep hills that are covered in snow in the winter but these are not rocky or barren and wherever possible the people have terraced the ground or hacked out small fields as they can.

Annie Lashermes inherited a large flock of sheep from her father and has over 200 sheep now.

She is a traditional shepherdess and tends her flocks by deciding on where they should eat each day and then goes off with her flock to that location. She or a friend is always with the flock. There are no stock proof enclosed fields in this region.

The flock sticks together, Annie stands with her stick besides the flock overseeing the sheep with her dogs beside her

She told me that she decides where the sheep are to go and they seem to know where she has chosen. She does not use her dogs as the British do: to chivvy and corral the sheep.

Annie looks over her flock and if a few ewes ere from their patch, which Annie has somehow willed out, she whistles and the erring sheep know exactly that they have overstepped the boundary and scuttle back to the main body of the flock.

Once, I was talking to her and she said we are just going to move to the next pasture on the other side of the road, nearby, and as she said that the first sheep moved over the road into exactly the place she had intended.

Sometimes Annie finds some sheep seem to have ignored the flock and she sends the dog off to “sort it out”. She talks so quietly I am certain that dog cannot hear her but her dog picks up a telepathic message and sets off. When I have seen her work her dog often the dog just approaches the errant sheep and glares at them. They immediately take fright and run back to join the others.

It is uncanny as Annie’s grazing areas are not bounded by anything more than her will. She grazes areas that are a portion of an open field sometimes half of which she does not have permission to use, yet this is not a problem.

As the weather changes she participates in what is called the Transhumance. This is the journey up from her village Saumane (300 metre altitude) where she and her flock live to the high pastures around Mont Aigoual (1567 metres altitude). Her flock join with thousands of other sheep of other flocks to take advantage of the pasturage at these higher elevations.

In order to do this journey they follow ancient Neolithic trails (the Draille). The Draille like all the ancient Palaeolithic tracks goes dead straight up and down the mountains just below the ridge line (so as not to be seen) on the lee side to the prevailing wind (for shelter). There are traditional stopping points on way.

The sheep that Annie thinks of as leaders, are decorated with coloured wool Pom Poms on their backs. The sheep go up at the end of May and come back down in September.

Annie tells me that the sheep know these ancient routes and follow them. She says that they somehow “feel” the track and keep on it. Another demonstration of this sort of behaviour are what is know as hefted sheep in the Uk. These flocks know their areas and live in them. The especially prevalent in the Lake District in the UK.

There is a bond between Annie and her sheep and the sheep know the ancient route of the transumance too.

See en.wikipedia.org/wiki/Transhumance

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Navigation Networks in the Brain

Professor Kate Jeffery of University College London gave the annual address to the Royal Institute of Navigation (RIN) this year (2014). This article published in RIN’s Navigation News is, for me, a seminal step forward in describing the parameters of animal navigation and building a structure to delve deeper into how navigation might work.
Her idea that you need to know where North is in order to orientate your “map” makes sense of a whole lot of otherwise incomprehensible research. Knowing where North is without a map does not get you home.
Richard Nissen
Editor September 2014

Brain Feature

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The amazing navigation of Shearwaters

http://www.delanceyplace.com/view_sresults.php?2591

 

Shearwaters

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The hippocampus of rats

Prof Kate Jeffery has done some very interesting work on how the hippocampus of rats processes navigational information. Scientists are clear that the hippocampus is critical for navigation but believe that it is only one part of a larger system that has many functions including recognising landmarks, computing distances and directions etc. and forming memories. For instance, the homing pigeon needs a direction to fly from its unknown (to it) release site until it reaches its own neighbourhood where its loft is, where it needs familiar remembered landmarks to help it home in on its own loft. The navigation system is thus closely linked to memory. Please see this link to see her work: http://www.ucl.ac.uk/jefferylab/research

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