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Location Spain, Castilla y León
Central coordinates 5o 15.00' West  41o 30.00' North
IBA criteria C6
Area 19,500 ha
Altitude 625 - 750m
Year of IBA assessment 2000


Site description The River Duero between Pollos and Zamora. The site includes alluvial woodland dominated by Salix, Populus and Ulmus and an area of marshland. The main human activity is arable cultivation.

Key Biodiversity This is an important site for breeding herons (Ardeidae) and Ciconia ciconia. Species of global conservation concern that do not meet IBA criteria: Falco naumanni (4-6 breeding pairs).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
White Stork Ciconia ciconia breeding  1996  110-125 breeding pairs  good  C6  Least Concern 
Black-crowned Night-heron Nycticorax nycticorax breeding  1996  61 breeding pairs  good  C6  Least Concern 
Purple Heron Ardea purpurea breeding  1996  3 breeding pairs  good  C6  Least Concern 
Egretta garzetta breeding  1996  22 breeding pairs  good  C6  Not Recognised 
Western Marsh-harrier Circus aeruginosus resident  1996  7-11 breeding pairs  good  C6  Least Concern 
Milvus migrans breeding  1995  50-75 breeding pairs  medium  C6  Not Recognised 


IUCN habitat Habitat detail Extent (% of site)
Forest Alluvial and very wet forest; Broadleaved evergreen woodland  50%
Wetlands (inland) Rivers and streams; Water fringe vegetation  15%
Artificial - terrestrial Arable land; Forestry plantations  60%

Land use

Land-use Extent (% of site)
agriculture 50%
forestry 5%
hunting 60%
urban/industrial/transport 10%
water management 10%

Protection status National None International Partial4,671 ha of IBA covered by Special Protection Area (Riberas de Castronuño, 4,671 ha).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Castronuño-Zamora. Downloaded from on 20/10/2016

To provide new information to update this factsheet or to correct any errors, please email BirdLife