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The site was identified as internationally important for bird conservation in 2002 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

Populations meeting IBA criteria ('trigger species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Black-crowned Night Heron Nycticorax nycticorax	LC	breeding (1999–2000)	740–1,565 pairs	A4i, B1i, B2, C2, C6
Little Egret Egretta garzetta	LC	breeding (1999–2000)	1,827–2,533 pairs	A4i, B1i, C2, C6

Year	Protected Area	Designation (management category)	% coverage of IBA
1978	Parco naturale delle Lame del Sesia	Parco naturale regionale/provinciale (IV)	73
1978	Riserva naturale speciale dell' Isolone di Oldenico	Riserva naturale regionale/provinciale (IV)	5
1978	Riserva naturale speciale della Garzaia di Villarboit	Riserva naturale regionale/provinciale (IV)	1
1978	Lame del Sesia	Regional Nature Park (-)	100
1990	Riserva naturale speciale della Garzaia di Carisio	Riserva naturale regionale/provinciale (IV)	8
1990	Garzaia di Carisio	Regional Nature Reserve (-)	8

Habitat	% of IBA	Habitat detail
Forest	70	Broadleaved deciduous woodland; Alluvial and very wet forest
Artificial/Terrestrial	15	Arable land
Wetlands (inland)	10	Standing freshwater; Rivers and streams; Water fringe vegetation
Shrubland	5	Scrub

Land use	% of IBA
nature conservation and research	100
agriculture	15
tourism/recreation	10

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: River Sesia heronries (Italy). Downloaded from https://datazone.birdlife.org/site/factsheet/river-sesia-heronries-iba-italy on 27/12/2024.