Ny fiskgjuse på väg söderut

Hösten 2008 – våren 2009 följde vi med hjälp av forskarna vid Lunds Universitet och Grimsö forskningsstation en fiskgjuse som sträckte ut över nordvästra Skåne och övervintrade i Senegal.

Läs om fiskgjusen som flyttade 2008/09

… och om årets fiskgjuse här:

Nu är en ny fiskgjuse på väg! Det är en ung hane som fick sin sändare den 6 augusti vid Kvarnnäsviken, Hammarsjön av Roine Strandberg och Patrik Olofsson
Notera att benen är korslagda och metallringen sitter på höger ben…

19 augusti 2009

Den 19 augusti påbörjade han sin första flyttning och flög över både Bjäre- och Kullahalvön.

22 augusti 2009

Efter att ha spenderat natten på Kullahalvön 19-20 aug drog han vidare norrut igen! Idag verkar han födosöka i sjölandskapet väster om Anderstorp i Småland.

Som kuriosa kan nämnas att ett av hans syskon som följdes förra året flög till Norge innan den begav sig söderut.

/ Roine Strandberg

24 augusti 2009

Nu har vår gjuse flyttat längre mot nordost och det verkar ju som den fiskar framgångsrikt eftersom den klarat sig i 5-6 dagar på egen hand.

/ Roine Strandberg

27 augusti 2009

Idag höll den unga gjusen till vid Stora Rängen, 15 km söder om Linköping, nära det inte helt okända området vid Bjärka-Säby.

/ Roine Strandberg

15 september 2009

Den unga gjusen är fortfarande kvar i Östergötland – men snart bär det av söderut…

/ Roine Strandberg

18 oktober 2009

Nu har ungfågeln äntligen rört sig ner på kontinenten! Efter en trevande start genom Sverige gick det undan till nordöstra Frankrike (tyvärr saknar vi positioner från flytten över Östersjön). Nu verkar han ha stannat i Frankrike några dagar och vi får se när det bär av härnäst…

/ Roine Strandberg

24 oktober 2009

Roine har (precis som gjusen…) givit sig ut på resa och istället rapporterar Raymond Klaassen från Ekologiska institutionen i Lund:
The Hammarsjön young that is now in France seems to make a stopover there. It is moving around a lake (see picture). This bird is really very late.
We follow two more juveniles from Ivösjon, they have both reached a potential wintering are south of the Sahara (see picture 2).
Will the Hammarsjön young be the first Osprey that we track that will stay in Europe for the winter? Or will he travel into Africa? In that case, he still has the most dangerous part in front of him: the crossing of the Sahara desert.

/ Raymond Klaassen

30 oktober 2009

I just checked the positions, and we have movement again! In the afternoon of the 30th of October the young bird has left his French lake and is on the move again.

/ Raymond Klaassen

5 november 2009

A lot has happened the last week. The delayed young Osprey from Hammarsjön that stayed for a long time in France has made an enormeous step foreward and has crossed the Mediterranean Sea and most of the Sahara desert!

The Mediterranean Sea crossing was very spectectular! Most adult Ospreys cross the sea near a narrow point such as Gibraltar or via Italy. Young birds normally just cross where they end up, which can result in a very long sea crossing (such as in this case).

This bird started the sea crossing in the morning (we lack early morning positions for this day, and pick the bird up at sea at 11:00). The bird passes Mallorca, but is does not stop there, at all three positions the bird was in flight. This is also obvious from the speed (distance between points), it does not slow down near Mallorca.

The last part of this crossing was made during the night. Ospreys very rarely fly during the night, in fact it only seems to happen in combination with long sea crossings. Flying over the sea costs a lot of energy as there are no thermals over water, the birds can thus not soar but have to flap actively with their wings. This day the Osprey travelled about 650 km, of which the largest part was over water.

The day after the impressive sea crossing the bird did not take a rest, but directly started, early in the morning, with the Sahara crossing.

Here the bird makes very good progress, travelling about 500 km per day.

The only thing that worries me a lot is the pattern in the end. The last 2 days the Osprey changed its course and is now flying due west. In this region strong easterly winds prevail, thus the bird is now ‘flying with the wind’.

We have seen before that birds that get into problems during their travels suddenly change their heading so that they align with the wind. In this way they will gain maximum support from tailwinds, and thus maximize travel speeds. We interpret this behaviour as ‘escape flights’ as they seem to try to escape as quickly as possible from the desert. The last locations from the bird are a true cliffhanger. Here we see the bird flying over the sand dunes (not a good habitat for Opreys).

Has the young Osprey enough energy reserves left to reach the coast, where fresh fish is waiting, or will it die in the desert?

New positions will come after the weekend….

/ Raymond Klaassen

14 november 2009

Our bird has reached the coast! Here he should be able to find some food again.

So we can conclude that the juvenile did not really succeed to cross the desert, he made a clear westwards escape flight (flying with the wind) which brought it outside this hazardous area.

It will be interesting to see what happens now. Our experiences with escape flights are not too good, most of the times the birds died shortly afterward, even though they had reached favourable fishing grounds….

/ Raymond Klaassen

21 november 2009

Our Osprey is still at the coast and is fishing in the sea. He seems to like to sit on some human made structures, possibly poles for an electricity line (note the small triangle structures that are placed at regular intervals along the road.

We hope that the bird will soon move southwards again!

/ Raymond Klaassen

27 november 2009

We did not get any new positions since the 21rst. I fear that the escape flight from the desert has been too much for our bird.

We really hope for new positions during the weekend!

/ Raymond Klaassen

4 december 2009

Raymond & Co trodde att flykten västerut från Sahara blivit för mycket för vår fiskgjuse och fick inga signaler från sändaren på flera dagar.

Men idag kom en ny rapport:

This is a little bit a miracle, it is very rare that we loose the contact with a bird for a short time, and that it then starts sending again. No idea why this has happened in this case, the area should be sunny, so it should not be a problem to charge the batteries with the solar panel.

Anyways, the bird is thus alive and kicking. He is moving between an inland site (with large trees) and the coast (the sea is the only fishing opportunity).

The northwest coast of Africa is probably not a typical wintering area for Ospreys. It will be very interesting to see whether this bird will make another attempt to cross the Sahara desert, or wheter it will stay here.

We previously have had a juvenile Osprey that retreated from the desert and flew back to Spain. In the winter this bird made a second again unsuccesful attempt (after which it died).

We have recently published a paper on the risks associated with the crossing of the Sahara desert. Some extra information on this can be found here: http://www.animalmovement-canmove.blogspot.com/ I’ll keep you updated.

/ Raymond Klaassen

8 januari 2010

A first update in 2010 from the young osprey that continuous to amaze us.

No movement for the time being, but the bird is certainly alive and keeps its territory north of the small city of Boujdour.

I have included the latest positions (we are now in the winter scheme, meaning that we only get 3 positions per day) and two pictures of the area I found on the web. One shows the road the bird is sitting next to, the other one the steep coast. Regards!

/ Raymond Klaassen