It is always important for the purposes of study to carefully observe and monitor the avifauna that in spring move on the Italian territory to go and nest in the Nordic territories after the wintering period that occurs during the winter season in much warmer countries. So every year we witness the pre-nuptial migration, with the various species ready to fly away conditioned by the meteorology which, depending on the years, may or may not give opportunities for good observations depending on the atmospheric agents that characterize the season. A season that, between 2013 and 2014, was characterized by a humid but mild winter, an infinite and very long autumn. The data of the CNR and of Arpa Lombardia argue that the first three months of the year (for meteorologists the coldest season of the year is from 1 December to 28 February) were really strange, almost tropical: for northern Italy the second warmer and third wettest from 1800 to today. And if only a few flakes of snow have been seen in the Lombard plain, in the mountains, especially on the Orobie, the accumulations of fresh snow have formed walls of more than seven meters. These are mood swings in the weather that we should get used to more and more. In recent years, each winter has been different from the previous one. Due to human action and normal climatic fluctuations in this historical period, weather anomalies are increasingly frequent. And so this year the temperatures were particularly mild, with an average above 2 ° compared to that of the years from 1971 to 2000.
In the second decade of February, the anticyclone's dominance continued, with few clouds over continental Europe and temperatures over 25 ° which provided an early spring. In particular, the appearance of the fog in some areas of northern Italy, unusual for the period, which prevented the sun from peeping at the low coastal altitudes of Liguria and the Venetian plains as far as the Polesine. This has conditioned the phenological evolution of some species that have made themselves desired with their almost total absence during the winter in our latitudes, since the temperature in the reproductive shores has remained above the norm. Peppola, Siskin and La Cesena were examples of this. These species, combined with an anomalous and disappointing passage of many others in the last autumn season, have ensured that the lands, usually frequented, gave an almost desolate impression due to the small number of subjects present.
But the spring season immediately began to get interesting. A significant meteorological change occurred in the last weekend of March with cold air of polar origin descending towards the Mediterranean and with snowfalls below 1.000 m. of share. Again the weather changed and the month of April was represented by days of good weather, especially that of the 25th, with temperatures above the norm, once again underlining the climatic trend of these last temporal phases. All this has positively influenced the arrival on the peninsula of the trans-Saharanians who enrich the territories of our beautiful peninsula with ornithological biodiversity, so much so that in the first fortnight of April this migration could already be considered positive in many respects. In addition to some species that were noticed a little in advance, there were those with their offspring already in tow thanks to a reproduction favored by the weather conditions.
At the FEIN Ornithological Observatory of Arosio it was thus noted the good presence of bottacci thrushes and black whales ringed in greater numbers than in past springs and with a much more constant and prolonged presence. The presence of the various Luì, the Blackcaps and the unusual ringing of a Bigiarella which usually at the Arosiana station is a typically summer-autumn species should also be emphasized.
The presence of the Blackbird, the Pettirosso del Colombaccio and the Codirosso are excellent. Among the catches it is interesting to point out that of a Blackbird on 13 April ringed on 6 June 2007, of a Green Woodpecker ringed on 14 August 2010 and recaptured on 20 April 2014 and that of a Great Tit ringed on 17 October 2011 and recaptured on 9 April 2014. The last ringing period, which runs from January to the end of April, recorded 170 subjects analyzed belonging to 23 species.
In 2013 there were 268 belonging to 29 species, in 2012 there were 192 subjects belonging to 21 species, in 2011 255 subjects belonging to 26 species were ringed, in 2010 180 subjects belonging to 25 species were ringed, in 2009 219 subjects belonging to 19 were ringed species and in 2008 there were 425 ringed subjects belonging to 29 species. In conclusion, 4 subjects have been ringed at the FEIN Ornithological Observatory from 1977 August 188.551 to date. A number destined to increase as the study activity continues with the breeding project, starting from 10 May 2014, assuming that in September 2014 the milestone of 190.000 ringed individuals will be reached.
8 May 2014
ANUU Migrators
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