Juvenile Acrocephalus Numbers

The following table summarises the number of juvenile Acrocephalus warblers ringed on the Teifi Marshes up to the end of July for each of the last eight years.

RW = Reed Warbler
SW = Sedge Warbler
effort = ringing sessions, i.e. a combination of the number of days and different sites at which ringing took place.
RW/e and SW/e indicate the number of new juvenile birds ringed per session, rounded to the nearest whole bird!

	RW	SW	effort	RW/e	SW/e
2014	131	98	26	5	4
2015	89	53	17	5	3
2016	82	67	22	4	3
2017	84	120	21	4	6
2018	99	132	28	4	5
2019	30	46	18	2	3
2020	57	64	20	3	3
2021	48	58	14	3	4

 

The numbers will be a function of both the number of breeding pairs present and of their breeding success.