Tuesday, January 22, 2019

Back to the blog

Certainly, the blog has been a bit abandoned for some time. I'll do my best to bring it back to life, or at least a bit more often than what it has been for the last year....

So, to start with again, some things from the last few days.
As I've been doing for the last five winters, the Reed Bunting (Emberiza schoeniclus) roosting project is still alive. Time has given a lot of perspective to the results, that start indicating some things.
Adult (EURING 6) males are starting to look really handsome!

Number of captures by age/sex and date, comparing the winters of 2017/18 and 2018/19.
The bottom chart is intentionally moved to the right, to 'make it fit' at the same timeline.
Note that I don't have data of October for the current winter, and that I stopped going to
the site on 2017/18 because of very few wintering birds!
One interesting thing to look at is the difference in sex-ratio. Just comparing this season with the previous one, this year it has definitely many more males than the previous. Last winter (2017/18) was very poor with wintering individuals in the area, but there were some very good days of migration (mostly females). This season, I have no data from October, but when I started in November the proportion of males was already higher than the previous year, and it has kept like this so far. Note that even some days males were more common than females! The reason? I don't know for sure.
This year has provided 5 foreign recoveries so far: 3 from France, 1 from Sweden and 1 from Switzerland (the latter is currently wintering at one of the sites). 
A first-year (EURING 3) female from Sweden, caught during
December. Sadly not a Falsterbo bird, but still it will be quite
exciting to know where it comes from - Sweden is so large!
Another first-winter (EURING 3/5) female, this one from
Switzerland. The first recovery from this country on this project!

But maybe, the best bird so far has been this first-winter, which is a truly rare case of 3 outer greater coverts unmoulted!

Wednesday, December 20, 2017

Tales from a (too) busy summer

It has been a very busy summer, indeed. So busy that I have ended up writing this blogpost in December...

CES ringing (SYLVIA project) has revealed a quite good breeding season for many species. Early and abundant spring rainfall provided a food for many passerine species and no strong rain episodes occurred during the main incubation period, which is usually a potential cause for breeding failure. By mid-May some of the early species had already chicks in regular numbers, and June is the best time for all the species, with fledgings from the latest breeding species and, usually, second broods of the sedentary fellows.

Juvenile (EURING 3) Melodious Warbler (Hippolais
. They arrive quite late, mostly during May, chicks
are mostly flying by mid-July, and they migrate very fast,
leaving the breeding grounds mostly during August.
Juvenile (EURING 3) Western Bonelli's Warbler (Phylloscopus
. They arrive slightly earlier, mostly during April, and
chicks are flying between late June and early July. They also leave
the breeding grounds between August and September.
Breeding Common Nightingales (Luscinia megarhynchos) start
the postnuptial complete moult shortly after chicks fledge.
The moult is also quite quick, with several primaries
dropped at the same time. They will leave the breeding grounds
also during August and early September and they have to be
 ready for that!
Some especial species caught during the CES ringing sessions were this juvenile Lesser Spotted Woodpecker (Dendrocopos minor) and this adult Turtle Dove (Streptopelia turtur) at La Corbatera, a riparian forest station, and two juvenile Rock Buntings (Emberiza cia) caught at Montserrat, a Mediterranean pine tree succession community.
Juvenile Lesser Spotted Woodpecker (Dendrocpos minor).
I had never seen one with this greenish tinge on the face and
Adult (EURING 4) Turtle Dove (Streptopelia turtur).

Juvenile (EURING 3) Rock Bunting (Emberiza cia).

At my main ringing station, L'Aiguamoll de la Bòbila, it was very nice to recover the breeding of Great Reed Warblers (Acrocephalus arundinaceus). Last year, since the wetland was dry during the whole spring and summer, there was only a brief sighting of a singing male after some little rain in June; but they never bred. This year, interestingly, two breeding pairs succeeded! Thanks to the ringing activities, both males and one of the females were already ringed from 2014 and 2015, which is quite interesting, since only one of these birds came last year, but they have all returned and succeeded this season!
A returning breeding female Great Reed Warbler from 2015!
Some interesting birds were caught in my main ringing station, L'Aiguamoll de la Bòbila, where I have already ringed more than 1000 birds this year.

Male Bee-eater (Merops apiaster).
Juvenile (EURING 3) Hoopoe (Upupa epops).
Juvenile (EURING 3) Wryneck (Jynx torquilla). Interestingly,
this species is not breeding in the area, so this juvenile in mostly
juvenile plumage caught in mid-July was clearly on juvenile
dispersion. As you can see, it's in the middle of the typical
woodpecker postjuvenile moult involving primaries.
To compare with the previous one, this breeding individual
from the SYLVIA station in La Corbatera was also on primary
moult in mid-July. It was aged as a 2cy (EURING 5) on the
pattern of the unmoulted primary coverts in the previous moult.
Talking about woodpeckers, this year we also had a breeding
pair of Green Woodpeckers (Picus viridis) at La Bòbila,
and this was the female. Aged as an adult (EURING 6) due to
the all moulted wing except some central primary coverts,
which seemingly happens regularly in adults of this species.
Working on the mountains with alpine species is always a delight, especially during the hot summer, when it's always very refreshing to be up there. One more year, we worked with breeding Northern Wheatears (Oenanthe oenanthe) in the same two areas we have been surveying in the past. Finally, we have started using colour rings with this birds, which will allow us to keep a better track of the returning individuals - which so far have been very few! Seemingly they do not return to the exact same breeding spots every season, so it's quite hard to detect them again when the habitat is so extensive.

Surprises are always welcome, as this cracking male Rock Thrush (Monticola saxatilis)!

It was also about wheatears when we went to some areas in the central part of Catalunya to target Black-eared Wheatears (Oenanthe hispanica), in collaboration with Reto Burri and José Luis Copete. The wheatears themselves are very nice birds!

Black-eared Wheatear in its typical open habitat.
Adult (EURING 6) male, black-throated morph.
Adult (EURING 6) male, white-throated morph.
But it was also a good opportunity to get experience with other typical species on this open habitats.
Tawny Pipit (Anthus campestris).
Woodchat Shrike (Lanius senator).
Western Orphean Warbler (Sylvia hortensis).
Ortolan Bunting (Emberiza hortulana).
An intense summer, with a lot of ringing, a lot of interesting data gathered and picture documentation... but too few time to put everything in order!!

Sunday, October 15, 2017

Wings over Falsterbo!

Millions, literally, of migratory birds fly over the Falsterbo peninsula every autumn. Its geographic position fits in what could be defined as a migration 'bottleneck', that Scandinavian birds use to shorten the sea-crossing from the southernmost parts of Sweden to Denmark or Poland, crossing the Baltic Sea. For anyone with a little passion for birds, a good day at Falsterbo is a truly astonishing experience.

The video above is representative of some minutes on a rather 'normal' September day at Falsterbo. It was recorded this last 16th of September, and you may recognize several passerines calling while actively migrating.

At the very start of the season, by late July, Acrocephalus species are already on the move, especially Sedge Warblers (A.schoenobaenus) but also the first migrant Reed Warblers (Acrocephalus scirpaceus). As soon as August starts more and more species finishes their moults (if they have any) and start their journeys south. As shown above, passerines migration reaches amazing numbers though August and September, when they are mainly Tree Pipits (Anthus trivialis), Yellow Wagtails (Motacilla flava), White Wagtails (Motacilla alba), Barn Swallows (Hirundo rustica), Sand Martins (Riparia riparia) and many other species. During September, Meadow Pipits (Anthus pratensis) will start dominating and finches will take over too, Song Thrushes (Turdus philomelos), Dunnocks (Prunella modularis), Goldcrests (Regulus regulus), Blue Tits (Cyanistes caeruleus) and with hundreds and hundreds of Chaffinches (Fringilla coelebs), Bramblings (Fringilla montifringilla), Siskins (Carduelis spinus) and other species like Reed Buntings (Emberiza schoeniclus) move on on daytime.

Chaffinch (Fringilla coelebs) and Woodlark (Lululla arborea)
Irruptive species are every year, the biggest change. This year it was a very good season for Crossbills (Loxia curvirostra), also some Two-barred (Loxia leucoptera) on the beggining of the season and very good numbers of Parrot (Loxia pytyopsittacus) during October!
Migrating Common Crossbills (Loxia curvirostra).
Raptors are also a big attraction to Falsterbo. Big numbers of Honey Buzzards (Pernis apivorus) can be seen during August, and then they are replaced by thousands of Common Buzzards (Buteo buteo) during September and October. Red Kites (Milvus milvus) are common migrants too, such as Marsh Harriers (Circus aeruginosus), but Hen (Circus cyaneus), Montagu's (Circus pygargus) and Pallid Harriers (Circus macrourus) also occur regularly through the season. Also worth mentioning the Black Kites (Milvus migrans), which are also uncommon but regular migrants over the peninsula. Eagles are always special, and usually, if any Eagle is wandering around southern Sweden it will eventually show up over the Falsterbo peninsula. Lesser Spotted Eagles (Aquila pomarina) are probably the more regular species, but Greater Spotted Eagles (Aquila clanga) also appear, and also eventual Steppe Eagles (Aquila nipalensis). Not to mention the regular White-tailed Eagles (Haliaeetus albicilla) or the Ospreys (Pandion haliaetus), which both occur regularly, especially the latter.
Top left to bottom right: adult Red Kite, juvenile Black Kite, adult female Marsh Harrier, adult female Montagu's Harrier, juvenile White-tailed Eagle, subadult Lesser Spotted Eagle, adult Osprey and  juvenile Rough-legged Buzzard.
Packed with Common Buzzards...
and also Red Kites!
LSE in the distance, between Buzzards.
Variability within Honey Buzzards. Bottom right is a first-year, the
rest are all adults, sexes mixed.
The variation among Common Buzzards is also great!
'Scandinavian'/'white' Buzzards are regularly seen. They are
so beautiful!
In terms of numbers, it's really shocking the large amount of Sparrowhawks (Accipiter nisus), that easily reach hundreds of individuals per day, and totals usually taking over 20.000 individuals each season. Falcons are less abundant, but also regular in good numbers, such as Hobbies (Falco subbuteo), Peregrines (Falco peregrinus), Common Kestrels (Falco tinnunculus) and Merlins (Falco columbarius).
Sparrowhawks are very common...
First-year Hobby (Falco subbuteo)
So common that they can pass even between your tripod legs!
Looking at the beaches, sandbars and pools close to the shore, good numbers of ducks and waders stop to feed and rest. At the beginning of the season, by late July and early August, hundreds of Terns (mainly Sandwich Sterna sandvicensis, Common Sterna hirundo, Arctic Sterna paradisaea) and waders, such as Red Knots (Calidris canutus), Bar-tailed Godwits (Limosa lapponica) and Oystercatchers (Haematopus ostralegus) are seen in rather big numbers. Dunlins (Calidris alpina) are also very common, peaking during August, and several more species appear in big numbers.

Revlarna packed with birds: waders, gulls, terns and ducks.
First-year Sanderlings (Calidris alba).
Wildfowl is also very abundant, with hundreds of Northern Pintails (Anas acuta), Northern Shovelers (Anas clypeata), Common Teals (Anas crecca), Mallards (Anas platyrhynchos) and thousands of Eurasian Wigeons (Anas penelope) gathering during September and October. Swans also gather in big numbers, especially Mute Swans (Cygnus olor), but Whooper (Cygnus cygnus) and Bewick's (C.columbianus) also occur. Geese are also very very common, and leaving apart the big flocks of Greylag (Anser anser) and local Canada Goose (Branta canadensis), there is a lot of migration of Barnacle (Branta leucopsis), Brent (Branta bernicla), Greater White-fronted (Anser albifrons) and Bean Geese (Anser fabalis). Common Cranes (Grus grus) are also seen in hundreds on migration between the end of September and beginning of October. Seawatching provides also big numbers of Common and Velvet Scoter (Melanitta nigra & Melanitta fusca), thousands of Common Eider (Somateria mollisima), numerous Black-throated (Gavia arctica) and Red-throated Divers (Gavia stellata), and much more...
Mute Swans (Cygnus olor) and Barnacle Geese (Branta leucopsis) resting
at Knösen.
Migrating Barnacles over the Flommen reedbeds. The species has increased
drastically in the last decades in Southern Sweden!
Migrating Greater White-fronted Geese (Anser albifrons).
Migrating Cranes (Grus grus).

... and several unexpected stuff, as these Short-eared Owls (Asio flammeus)!

As you can imagine, this has been just a little glimpse of how amazing can be just to go to Falsterbo, sit down and enjoy bird migration. You can see pretty much anything migrating there... except maybe for actual seabirds, which sadly have decreased a lot around the area since the building of the bridge that connects Copenhague and Malmö. Nonetheless, in a nice, very strong westerly winds, it is worth going to some coastal places in the northern parts of Scania, where you might be lucky and enjoy big numbers of several seabird species, including sometimes very good views.

On my very last day this season we went seawatching around Torekov headland, and we saw this amazing Black-browed Albatross (Thalassarche melanophrys) from Rammsjö!!!
Picture by Tim Micallef. Grazzi!