Honey Buzzard Phenology in Holland


Breeding Season Timing from 2000-2003


Full Sources:


Bijlsma, R G, 2001. Trends and breeding success of raptors in The Netherlands in 2000. De Takkeling 9: 12-52.

Bijlsma, R G, 2002. Trends and breeding success of raptors in The Netherlands in 2001. De Takkeling 10(1): 7-48.

Bijlsma, R G, 2003. Trends and breeding performance of raptors in The Netherlands in 2002. De Takkeling 11(1): 6-54.

Bijlsma, R G, 2004. Trends and breeding performance of raptors in The Netherlands in 2003. De Takkeling 12(1): 7-55.


Web references to summaries of above, used for compilation below in Table 1, are at


2003 report 2002 report 2001 report 2000 report



Year

First egg laid

Average onset of laying

Latest onset of laying

Notes

2000

15th May

22nd May


Only 17% non-layers in one area; several nestlings weighed over 1,200g; 1.8 nestlings/successful pair; very successful year with plentiful food supply

2001

21st May

28th May

9th June


12/35 nests failed in one area; 1.54 nestlings/successful pair

2002

20th May

27th May

9th June


Apparently many novice birds in population; 1.73 nestlings/successful pair

2003

22nd May

31st May

9th June


Poor food supply, many failures

Table 1: Times for Onset of Laying and Comments on Breeding Season in Holland 2000-2003


Table 1 shows that the earliest onset of laying varies from 15th-22nd May over the four years. Incubation is given as 30-35 days and fledging as 40-45 days (Cramp, 1980, p.21-22), giving 70-80 days in total. Adding 70-80 days to earliest egg laying dates would give earliest fledging dates of 24th July - 10th August. Mean fledging dates would be later than this, ranging from 31st July - 19th August. Latest fledging times would vary from 18th August - 28th August.


It is clear that in Holland juvenile Honey Buzzards will start to fledge in the last week of July with peak fledging in the first half of August and stragglers through to the last week of August.



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Nick Rossiter 2005