As basic results of the present retroactive research we have reported the global numbers as at the Fig. 20-21 , for the two ( Central and Northern) flyways and Eastern and Western sites of recording . Trying to "read" at best the real dynamics of the migration's flows , we must consider the details offered by the Peaks/Waves (PW) as every season they happen times) during autumn migration , and probably we can consider PW as a "thermometer" of the seasonal migration: the intensity's volume of the single PW should be indicative of the total force of the migration of a specific year and of the volume of populations at the origin sites (nesting areas). In the other paper ( The Ring Vol.40,2018, ISSN ) (2f) we have discussed the PW item "We have here five or six groups of pigeons passing Italy in different parts of autumn and the time of the passage including a few peak days is quite well stable between years . Yearly peaks in different waves , as well as the waves themself are not regularly at the same relative volumes,but this normal that different groups have own number size and migration dynamics " and also concluding the paper "...we need more data -from more years and more sites in regions -to be able to draw detail picture of the wave and population structure of pigeons migration " . The present research is alligned to this aim . Many PW were extracted from records in 8 sites by 8 Observers : 87 PW in Central Italy and 31 North Italy , but we have considered only selected PW as following 54 PW in Central Italy and all 31 PW in Northern Italy . The flexible selection of PW has been done considering day by day the sizes and concentrated flows in hours/timing , daily number of WP and flocks . We have observed in 7 years 2 or 3 PW for each year as following : - in 5 years 3 PW/ 1 y, in Central Italy -in 2 years 2 PW /1 y , in Central Italy
As basic results of the present retroactive research we have reported the global numbers as at the Fig. 20-21 , for the two ( Central and Northern) flyways and Eastern and Western sites of recording . Trying to "read" at best the real dynamics of the migration's flows , we must consider the details offered by the Peaks/Waves (PW) as every season they happen times) during autumn migration , and probably we can consider PW as a "thermometer" of the seasonal migration: the intensity's volume of the single PW should be indicative of the total force of the migration of a specific year and of the volume of populations at the origin sites (nesting areas). In the other paper ( The Ring Vol.40,2018, ISSN ) (2f) we have discussed the PW item "We have here five or six groups of pigeons passing Italy in different parts of autumn and the time of the passage including a few peak days is quite well stable between years . Yearly peaks in different waves , as well as the waves themself are not regularly at the same relative volumes,but this normal that different groups have own number size and migration dynamics " and also concluding the paper "...we need more data -from more years and more sites in regions -to be able to draw detail picture of the wave and population structure of pigeons migration " . The present research is alligned to this aim . Many PW were extracted from records in 8 sites by 8 Observers : 87 PW in Central Italy and 31 North Italy , but we have considered only selected PW as following 54 PW in Central Italy and all 31 PW in Northern Italy . The flexible selection of PW has been done considering day by day the sizes and concentrated flows in hours/timing , daily number of WP and flocks . We have observed in 7 years 2 or 3 PW for each year as following : - in 5 years 3 PW/ 1 y, in Central Italy -in 2 years 2 PW /1 y , in Central Italy