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Hebridean Imaging

Hebridean Imaging

RAS

Spuggy RAS Review for 2012

As a new year begins, it is a time to correlate the past year’s data from our Retrapping of Adults for Survival (RAS) project and to summarise the results. Since the project began in November 2010, a total of 445 House Sparrows have been colour-ringed within our study area here in Askernish, South Uist.  213 birds were ringed in 2012, of which 183 were juveniles and a total of 5995 field observations  were recorded.

When the RAS season ended, we had managed to amass a total of 3783 field observations taken during the 5 month period, April  to August. Breaking this data down to its simplest form, this years flock consisted of 57 adults who have remained within the study area, an increase of 3 on last year. They were joined by an additional 19 adults, the vast majority of these being caught during bad weather in a period when they were probably feeding chicks in the nest. These birds could therefore be having to venture a little further afield from nearby areas, attracted here by the food we provide. This is borne out by the fact that these birds are very rarely, if ever, seen again.

As for juveniles, the number of individuals caught and colour-ringed increased from 81 last year to 183 this. This is in part explained by some additional effort by us, but mainly due to an exceptional breeding season, with many pairs double brooding.

Numbers peaked in July when a total of 160 individuals were recorded here in Askernish. This fell away sharply in August, probably due to dispersal and also the presence of one, sometimes two Sparrowhawks in the immediate area. The majority of the juveniles have now dispersed and most will find pastures new.

September and October is a time when we experience an influx of new birds into our study area as juveniles from elsewhere disperse and integrate with local populations. It is also the time when we hope to hear about sightings of our birds from elsewhere. Sightings away from our study area during 2012 far exceeded those of the previous year and involved some 29 birds.

As can be seen from the map, they were reported from 7 locations, ranging from Balranald in the north to South Glendale in the south. With so many birds being seen in the latter location, how long will it be before one is reported from Barra or beyond?


View House Sparrow Sightings 2012 in a larger map

There were 3 sightings on North Uist, these being at Balranald (47 km), Clachan na Luib (41 km) and Bay Head (43 km) and involved a single bird at each location. The ring numbers of the birds seen at Balranald and Clachan na Luib could not be read so we cannot identify the individuals. A37 seen at Bay Head is a long staying bird originally seen in June 2011, and is now considered to be resident in that area. All three sightings involve a distance travelled of over 40 km, which, for a House Sparrow is considered to be a long distance movement.

There were reports of sightings from 4 locations on South Uist, of which 3 involved more than one bird.  A single bird, C20 was seen in Daliburgh (3 km) on 11th November, only to be joined by another 3 (C80, F83, G04) late in December.  4 birds (B43, C48, C58, C74) were all reported from Carnan  (24 Km) on various dates in October, two of which (B43 & C74) have remained. B43 is of interest as it is the only adult bird (second year bird – ringed as a juvenile in 2011) that has been recorded as changing locations, although it’s whereabouts in between leaving Askernish in July 2011 and arriving in Carnan remains a mystery. The single bird F70 was seen in North Smerclete (11 km) on 10th December.

For whatever reason, South Glendale (11 km) would appear to hold a special attraction for the House Sparrows of Askernish with 22 individuals being reported throughout the year. B25 and B37 arrived in 2011, both being juveniles from that year. B37 was not seen after February 2012 but B25 remains there to this date. As for the other 20 birds, 19 were this year’s juveniles, all arriving during October apart from one which was first seen in November. G05 which was ringed in November in adult plumage is presumed to be a first year bird due to its change of locations. Of all the birds seen at South Glendale, apart from B25, only 2 other birds remained until the end of the year.

Of the birds sighted in South Glendale, 3 were of special interest as they were seen in multiple locations.  C20 was seen in South Glendale on 11-12th October and then in Daliburgh on 11th November. C48 and C58 were seen in both South Glendale and Carnan and initially assumed to have travelled together, where in fact they travelled in opposite directions. C48 was first seen in Carnan on 15th October and arrived in Glendale on 26th, while C58 was in Glendale on 7-8th October and arrived in Carnan 12th. The only other bird known to have commuted between two sites was a first year bird that went between Askernish and South Glendale in 2011, and therefore these additional sightings may well be an indication of the random nature of post juvenile dispersal.

2012 has been a good year for our House Sparrows and our project, which we hope will continue into 2013. Once again, I appeal to anyone who sees one of our colour ringed birds to report the sighting by emailing us at  askernish.sparrows@gmail.com. These birds are sporting colour rings that are white with black lettering which consist of A00-99, B00-99, C00-99, F00-99 and G00-99. I would hope one would eventually turn up in your garden.

Once again, our thanks go to Bill for the time and effort he expends helping us with this project. His records are always concise and accurate and the project would be all the poorer without him. I also thank all those who took the time and trouble to report their sightings to us. I can assure you that it is very much appreciated.