Thursday, February 25, 2016

Long-tailed Tit subspecies in the Iberian Peninsula

There are two Long-tailed Tit (Aegithalos caudatus) subspecies in the Iberian Peninsula: A.c.taiti and A.c.irbii. The first occurs in central, North and Western Spain and Southern France, while the latter ocurs in Central and Eastern Spain (including most of Portugal). Iberian subspecies distribution is not fully studied, at least as long as I have been able to find in the literature, and some hybridization areas may occur.

Pinkish colours are restricted to undertail coverts and belly,
with rather uniform grey on upperparts. Andalusia, South Spain,
December. A.c.irbii.
A.c.irbii to the left, A.c.taiti to the right.
Check how darker is irbii on cheeks, and how the black stripe
almost reaches bill base.
Apart from the local, sedentary subspecies, there's no information of any foreig retrap in Catalunya (source: www.sioc.cat), neither in the whole Spanish ringing scheme (source: www.anillamientoseo.org). There's only the recovery of a Long-tailed Tit ringed in Spain and recovered in France, but no detailed information. The most likely scenario is that it will be a bird ringed close to the French border and recovered on the other side (?). No other references of foreign birds/subspecies in Spain have been found; and actually, apart from the striking White-headed Long-tailed Tit subspecies (A.c.caudatus), subspecies identification can be very tricky outside of the known distribution range.

 On January I trapped a very striking Long-tailed Tit that attracted my attention since I saw it for first time. I have trapped quite a lot of local birds around Catalunya, and I had never seen any individual similar: very clean white underparts and cheeks and extensive white patch in crown and forehead. In the same net I was lucky enough to catch a local individual, retrap, that was very useful to compare.

The "whitish" bird above, the local individual below.
And that is what happened when I put them together...
  A.c.caudatus can be quickly ruled out on plumage features, but what about europaeus?
Checking pictures during the breeding season taken in the breeding range of europaeus, all individuals fit with the features shown by the bird I trapped: extensive white crown, wide white forehead, whitish ("clean") cheeks and underparts...

The presumed europaeus (left) had appearently a stronger bill
than a normal taiti; although I couldn't take proper measurements,
it's so small anyway!
A.c.europaeus, picture by Emil Lundahl taken in Falsterbo
peninsula, Sweden. Note the very clean white underparts,
as the extensive white on crown and forehead and clean cheeks.
A.c.europaeus, picture by Emil Lundahl taken in Falsterbo
peninsula, Sweden. Note the clean underparts and very clean,
'open-faced'.

Looking to local breeders in other places in Catalunya, especially breeding birds in the Pyrenees, there're no obvious differences with breeding individuals in other places.

Local individual trapped in central Catalonia, age EURING 6
(because it was a retrap from 2013). A.c.taiti.
Wear was for sure not the cause of the whitish plumage, as worn
birds turn to be greyer overall. Breeding individual in central
Catalonia, June. A.c.taiti.
Local breeder in Pyrenees, ringed in July and recaught in
winter. Plumage features fit will all other breeders I have
seen in Catalunya. A.c.taiti.
Despite all of this, only DNA analyses could confirm for sure the subspecies identification... but in the meanwhile, keep looking at the Long-tailed Tits!

Saturday, February 20, 2016

Gallocanta

I think February is quite a good time for this short trip to Gallocanta and surroundings. Cranes (Grus grus) invade Gallocanta lagoon every winter in flocks of thousands; they eat on the field around the area and they come, at dusk, to sleep on the laggon. That is an scenario that I truly recommend to everybody.
Around the lagoon there's an extense area of low reedbeds, grasslands and drylands. Hen Harriers (Circus cyaneus) are also very common, flying around trying to catch some Calandra Larks (Melanocorypha calandra), Skylarks (Alauda arvensis) or Corn Buntings (Emberiza calandra), three of the commonest passerine species in the area.

I was preety enthusiastic about the few Iberian hares (Lepus granatensis) we saw, I had only seen europaeus so far and they actually look very different!
If you are lucky you can also get to see a flock of Black-bellied Sandgrouses (Pterocles orientalis), a rather endangered species in Catalunya, especially for habitat loss, but still with good areas in Aragón.

Back to the Cranes, the moult strategy is something that has kept me always interested about. It is well known that many non-passerines species have very different moult strategies rather than the usual passerine strategies. In the Eurasian Crane (Grus grus), the postjuvenile moult is partial, and involves some head, neck and body feathers. Thus, ageing first-winter individuals in the field is quite easy: they still have many juvenile feathers.

Two first-winters. Still amny juvenile feathers; head, neck and tertials are striking.
'Advanced' first-winter, the second starting from the right. Still easy to age
from the distance.
Rufous head is particularly useful in flight!
Cramp et al. (1979) also says first-winters have a winter moult, between December and May, which is partial, and also involves head and neck and some body feathers, tertials and upper wing coverts. Then, after their first summer and to the second winter, individuals can still be aged on the juvenile primaries (not moulted yet) and, as they moult slowly, they tend to have more retained feathers in head, neck and body than adults. It is estimated that flight feathers are moulted for first time on the 3rd summer, although some birds started it in the 4rth. After that moult, adults replace flight feathers every 2 to 4 years, depending on different factors like breeding success. The flight feather's moult is simultaneous, like Wildfowl, and it takes a period of a few weeks being flightless. Some strategies for the flightless period are suggested, from moulting at the same time as breeding (already with running chicks) to Cranes reported moulting while hidden in a reedbed.

Adults
Notice the difference in wear in the two adults below. The bird on the left shows no retained head, neck, body feathers, neither wing coverts (except for primary coverts), which suggest it is an adult that has been carrying the same flight feathers for some seasons!

  
Later on, I was surprised when I saw this adult in apparent secondary moult, but I guessed it was hurt or something. But when it flew, and as you can see below, it was actually moulting secondaries!! At least the gaps in both wings seems of the same size (involving the same feathers). Primaries look new (compare with the bird flying behind, which is the same commented above), and grown secondaries also look pretty new. An adult that started flight feathers moult and that suspended after finishing primary moult, and continued in the wintering grounds?? Maybe a moulting bird in the area that is not flightless anymore, but still hasn't finished the moult?


A trip to Aragón in winter deserves a visit to Gallocanta, but also to Belchite steppes. We had the chance to hear, and rather close, up to 5 Dupont's Larks (Chersophilus duponti) singing at dusk. For those interested in going there, remember to be respectful: Dupont's Lark is a really endangered species, especially because it is very sensitive to disturbance and habitat loss.


But as I was saying, and especially if you haven't gone yet, Gallocanta is a must-see for next winter!

Sunday, January 31, 2016

Where's the rain?

The next question will be already... 'What does rain mean?'
Maybe I am exaggerating a bit, but seriously, I haven't seen rain for the last half year. Indeed, last time I saw actual rain I was still in Sweden...

My local patch, almost completely dry..!
The combination of no rain plus higher temperatures than usual are making this winter very strange. I would had never imagined I would miss those celcius below zero, freezing my hands while putting up nets or whatever, and creating those frozen landscapes...

Anyway I have got an entire month full of things, so here's a review of the entire January!

I started the year in my particular piece of paradise, Cuberes, where I trapped some Goldcrests (Regulus regulus) - quite cute species to start this year's ringing!

First sunset in 2016...
The following days, back home, I realised I had already ringed most of the wintering individuals of most of the species. This winter it's strange...
A minimum of 6 Penduline Tits (Remiz pendulinus) are one of the most interesting wintering species so far this year. One of them, on the picture below, was already ringed the previous winter.

As most of birds were ringed already, I started putting my efforts on other stuff. I have been using the clap nets quite usually, focusing of wintering Black Redstarts (Phoenicurus ochruros) and Stonechats (Saxicola rubicola). They are common wintering visitors to the fields, and especially related to human and agricultural areas.

No "paradoxus" so far, but quite nice adults...

I have also got time to focuse in not such easy species to catch. With the very determinant collaboration of my mouse, I got 3 Kestrels (Falco tinnunculus).
Using cages, the first Water Rail (Rallus aquaticus) ever ringed in my place was caught, being the species number 90 ringed at the station!

A few days ago I had trapped this Common Snipe (Gallinago gallinago), ringed in 2014 at the same spot; and the day after the Water Rail and at the same wader place, we got this unexpected Jack Snipe (Lymnocryptes minimus)!

Gallinago gallinago
Lymnocryptes minimus
 The day after, and following a quite nice sequence of good days, we got this very nice Black Wheatear (Oenanthe leucura) on a day off from my usual area. They are seemingly very easy to catch with clap nets..., I think it took us about 10 minutes to spot it, set three traps and get it.

Second-year (EURING 5), male
I was surprised for the not extensive postjuvenile moult, involving only 3 inner GCs in our bird.

Nice set of species to start the year, will see what follows...! For the moment, I'll keep waiting for a bit of rain and cold (just to imagine the possibility of some nice winter species showing up...). Will see...!

Thursday, December 31, 2015

TOP 5: 2015

Yeah!, I like the top 5 ranking. And especially when there's that many things to choose that makes almost an impossible decision to pick just 5!
Without more preable, here they go!

5- Falcons
If in the Top 5 2014 I placed "Eagles" in the number 5, this year is the turn to Falcons. With the invasion of Red-footed Falcons (Falco vespertinus) during May in Catalunya, and the "Falcon story" that you may have already heard about, this year I have actually trapped and ringed Red-footed, Peregrine, Hobby and Merlin. A very nice combo!


4- Illa de l'Aire
During May I spent some days in Illa de l'Aire, an small island south of Menorca, in the Balearic Islands. As always, I had very nice days with an incredible company. Thanks, one more time, to all Menorcan friends and see you in 2016!!


3- Morocco
In February I went to Morocco, for some days ringing in Yasmina lake and some days birding around the country. It was my second time there, but I enjoyed everything again as it was the first time. As Bald Ibis was selected in the 2013's top 5, this the picture will be about a Temminck's Lark (Eremophila bilopha), that was really tame close to Boumalne Dades.


2- 3900 ringed birds!
I just checked the total number of birds I have ringed in Catalunya this year: more than 3900. That's an actual lot, considering the places where I usually go and the fact that I am usually alone!
Anyway, big thanks to all friends that have come in one or another session for their help!! I kind of think 4000 birds will be hard to reach, but let's see...
Some birds from this year (click to enlarge!):


1- Falsterbo
Falsterbo is still on the first position, for the third year already. A part from the Falcon story, many other things happened, and with very nice friends around. I could tell that many things, that I'll just leave it remembering this Yellow-browed Warbler (Phylloscopus inornatus). A big hug to all my friends and... Vi ses!!!



All the best for 2016, another very nice year is just ready to start...
Molt bon any nou!