Table 1 Breeding parameters of the Maghreb Magpie (Pica mauritanica) recorded during 2017 and 2018 breeding seasons in Tunisia (Sbikha)
From: Breeding biology of a relictual Maghreb Magpie (Pica mauritanica) population in Tunisia
Breeding parameter | 2017 | 2018 | Years combined | Test for difference between years |
|---|---|---|---|---|
Active nests | 13 | 20 | 33 | – |
Replacement clutches | 1 | 0 | 1 | – |
Range of clutch size | 4–7 | 3–6 | 3–7 | – |
Modal clutch | 6 | 4 | 6 | – |
Total number of eggs laid in the colony | 75 | 90 | 165 | – |
Mean clutch size ± SE | 5.77 ± 0.69 | 4.50 ± 0.18 | 5.00 ± 0.19 | Z = 3.56, P = 0.000 |
Egg hatching rate (%) | 55% | 57% | 56% | χ21 = 0.066, P = 0.796 |
Hatching success ± SE | 3.15 ± 0.54 | 2.55 ± 0.44 | 2.78 ± 0.34 | Z = 0.99, P = 0.321 |
Fledging success ± SE | 2.07 ± 0.48 | 1.45 ± 0.38 | 1.69 ± 0.30 | Z = 0.89, P = 0.369 |
Nestling survival rate (%) | 66% | 57% | 61% | χ21 = 0.771, P = 0.379 |
Breeding success (%) | 36% | 32% | 34% | χ21 = 0.260, P = 0.609 |
Nest survival (%) | 85% | 75% | 79% | χ21 = 0.435, P = 0.509 |
Fledging survival (%) | 82% | 73% | 77% | χ21 = 0.257, P = 0.611 |
Rate of successful nest (%) | 69% | 55% | 61% | χ21 = 0.668, P = 0.413 |