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Table 2 Reproductive parameters of the European Roller population of Lazio region during the study period 2010–2016

From: Nest box selection and reproduction of European Rollers in Central Italy: a 7-year study

Year Occupied nests No. of successful breeding pairs Values No. of eggs laid No. of eggs hatched No. of eggs not hatched No. of fledglings Hatching success Fledging success Breeding success
2010 15 6 Mean 5.28 4.50 1.62 4.37 0.84 1.00 0.84
SD 0.48 1.37 1.84 1.18 0.25 0.00 0.25
Total 32 27 5 27    
2011 19 11 Mean 5.38 4.18 1.36 4.18 0.75 0.81 0.75
SD 0.76 2.13 2.11 2.13 0.38 0.40 0.38
Total 61 46 15 46    
2012 16 11 Mean 5.00 4.64 0.27 4.42 0.95 0.92 0.86
SD 0.91 1.08 0.90 1.60 1.15 0.26 0.32
Total 56 53 3 50    
2013 14* NA Mean
SD
Total 32* 23*
2014 11* NA Mean
SD
Total 46*
2015 32 32 Mean 4.75 3.66 1.09 3.50 0.77 0.83 0.74
SD 1.08 1.77 1.63 1.90 0.35 0.37 0.37
Total 152 117 35 112    
2016 33 29 Mean 4.74 2.54 1.66 2.22 0.53 0.80 0.47
SD 1.29 2.21 1.89 2.2 0.43 0.35 0.42
Total 136 78 48 69    
Study-period 20.00 17.80 Mean 5.03 3.90 1.20 3.74 0.77 0.87 0.73
8.8 11.82 SD 0.48 0.78 0.54 0.76 0.13 0.07 0.23
  1. Parameters are calculated on the number of breeding pairs for which data were complete for the entire season (pairs with NA data were discarded from the analyses). The * represents data that may not be exhaustive for the year under consideration. Values are reported as mean ± SD. The total number for each parameter is also reported. Complete data for breeding pairs were not available for 2013 and 2014