|Scientific Name:||Ardea cinerea|
|Species Authority:||Linnaeus, 1758|
|Taxonomic Source(s):||Christidis, L. and Boles, W.E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Collingwood, Australia.|
|Red List Category & Criteria:||Least Concern ver 3.1|
|Reviewer(s):||Butchart, S. & Symes, A.|
|Facilitator/Compiler(s):||Ekstrom, J., Butchart, S., Malpas, L.|
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend is not known, but the population is not believed to be decreasing sufficiently rapidly to approach the thresholds under the population trend criterion (>30% decline over ten years or three generations). The population size is very large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
|Previously published Red List assessments:|
Native:Afghanistan; Albania; Algeria; Angola (Angola); Antigua and Barbuda; Armenia (Armenia); Austria; Azerbaijan; Bahrain; Bangladesh; Barbados; Belarus; Belgium; Benin; Bhutan; Bosnia and Herzegovina; Botswana; Brazil; Brunei Darussalam; Bulgaria; Burkina Faso; Burundi; Cambodia; Cameroon; Cape Verde; Central African Republic; Chad; China; Comoros; Congo; Congo, The Democratic Republic of the; Côte d'Ivoire; Croatia; Cyprus; Czech Republic; Denmark; Djibouti; Dominica; Egypt; Equatorial Guinea; Eritrea; Estonia; Ethiopia; Faroe Islands; Finland; France; Gabon; Gambia; Germany; Ghana; Gibraltar; Greece; Guadeloupe; Guam; Guinea; Guinea-Bissau; Hong Kong; Hungary; Iceland; India; Indonesia; Iran, Islamic Republic of; Iraq; Ireland; Israel; Italy; Japan; Jordan; Kazakhstan; Kenya; Korea, Democratic People's Republic of; Korea, Republic of; Kuwait; Kyrgyzstan; Lao People's Democratic Republic; Latvia; Lebanon; Lesotho; Liberia; Libya; Liechtenstein; Lithuania; Luxembourg; Macao; Macedonia, the former Yugoslav Republic of; Madagascar; Malawi; Malaysia; Maldives; Mali; Malta; Martinique; Mauritania; Mayotte; Micronesia, Federated States of ; Moldova; Mongolia; Montenegro; Montserrat; Morocco; Mozambique; Myanmar; Namibia; Nepal; Netherlands; Niger; Nigeria; Northern Mariana Islands; Norway; Oman; Pakistan; Palestinian Territory, Occupied; Philippines; Poland; Portugal; Qatar; Romania; Russian Federation; Rwanda; Saint Kitts and Nevis; Saint Lucia; Saint Vincent and the Grenadines; Saudi Arabia; Senegal; Serbia (Serbia); Seychelles; Sierra Leone; Singapore; Slovakia; Slovenia; Somalia; South Africa; South Sudan; Spain (Canary Is.); Sri Lanka; Sudan; Swaziland; Sweden; Switzerland; Syrian Arab Republic; Taiwan, Province of China; Tajikistan; Tanzania, United Republic of; Thailand; Togo; Trinidad and Tobago; Tunisia; Turkey; Turkmenistan; Uganda; Ukraine; United Arab Emirates; United Kingdom; Uzbekistan; Viet Nam; Western Sahara; Yemen; Zambia; Zimbabwe
Vagrant:Greenland; Saint Helena, Ascension and Tristan da Cunha; Saint Pierre and Miquelon; Svalbard and Jan Mayen
Present - origin uncertain:Australia; Palau
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||The global population is estimated to number c.790,000-3,700,000 individuals (Wetlands International 2006), while national population estimates include: c.100,000-1 million breeding pairs and >c.10,000 individuals on migration in China; c.100-10,000 breeding pairs and c.1,000-10,000 wintering individuals in Korea; c.100,000-1 million breeding pairs and >c.10,000 wintering individuals in Japan and c.100,000-1 million breeding pairs and >c.10,000 individuals on migration in Russia (Brazil 2009).|
Trend Justification: The overall population trend is uncertain, as some populations are decreasing, while others are stable, increasing or have unknown trends (Wetlands International 2006). In Europe, trends since 1980 show that populations have undergone a moderate increase (p<0.01), based on provisional data for 21 countries from the Pan-European Common Bird Monitoring Scheme (EBCC/RSPB/BirdLife/Statistics Netherlands; P. Vorisek in litt. 2008).
|Current Population Trend:||Unknown|
|Habitat and Ecology:||Behaviour Most Palearctic populations of this species are fully migratory, dispersing widely in September-October after the breeding season and returning to breeding grounds in February (Kushlan and Hancock 2005). Further south, populations tend to be sedentary or only partially migratory. Most migratory movements occur nocturnally, with birds moving in small parties or larger flocks of 200-250 (Brown et al. 1982). The species breeds January-May in the Palearctic Region, and in spring and summer in temperate areas, but mainly during the rains in Africa and the tropics(although here it may also breed in any month of the year) (Kushlan and Hancock 2005). It breeds in mixed colonies of hundreds or thousands of pairs (the largest colony in Europe is 800-1,300 pairs), although it may also nest solitarily or in small groups of 2-10 nests (Kushlan and Hancock 2005). The species is typically a solitary feeder but at abundant temporary food sources, or where available feeding areas are restricted, large congregations may occur (Snow and Perrins 1998, Kushlan and Hancock 2005). It feeds at any time day or night, but is most active at dawn or dusk, typically roosting communally or solitarily (Brown et al. 1982) during the middle of the day and at night (Kushlan and Hancock 2005) in trees and on cliffs, low rocks, islets or along shores (Brown et al. 1982). Habitat This species is a generalist in its habitat use, although shallow water, relatively large prey, and four or five months of ice-free breeding season are among the essential characteristics of its habitat (Kushlan and Hancock 2005). It occurs from sea-level up to 500 or even 1,000 m, occasionally breeding much higher (Snow and Perrins 1998) (2,000 m in Armenia, 3,500-4,000 m in Ladakh, north-west India), inhabits any kind of shallow water, either fresh, brackish or saline, both standing or flowing, and shows a preference for areas with trees as it is commonly an arboreal rooster and nester. Some degree of isolation and protection are also typical of places chosen for roosting and nesting (Kushlan and Hancock 2005). The species is found inland on broad rivers, narrow streams, lake shores, ornamental ponds, fish-ponds, marshes, flood-plains, reeds swamps, rice-fields and other irrigated areas (Brown et al. 1982, Snow and Perrins 1998, Kushlan and Hancock 2005), river oxbows, reservoirs, ditches, canals, sewage farms, inland deltas, and on islets and emerging rocks (Snow and Perrins 1998). On the coast the species also frequents deltas, salt-marshes, mangroves (Brown et al. 1982, Kushlan and Hancock 2005), estuaries, tidal mudflats, muddy and sandy shores, and sand-spits (Snow and Perrins 1998). Diet Its diet consists predominantly of fish and eels 10-25 cm long, as well as amphibians, crabs, molluscs, crustaceans, aquatic insects, snakes, small rodents, small birds (Brown et al. 1982, Snow and Perrins 1998, Kushlan and Hancock 2005) and plant matter (although this may be incidental,or only to aid in pellet formation) (Brown et al. 1982, Snow and Perrins 1998, Kushlan and Hancock 2005). Breeding site The nest is a stick platform that is often re-used over successive years (Kushlan and Hancock 2005), usually positioned high in a tall tree up to 50 m, but also on the ground or on cliff edges, in reedbeds or in bushes. In reed-beds nests may be built of reeds, and ground nests may be reduced to a slight scrape, ringed with small stones and debris (Snow and Perrins 1998). The species commonly nests in colonies, and nesting sites are typically situated 2-38 km (convenient flying distance) from preferred feeding areas (Kushlan and Hancock 2005).|
|Systems:||Terrestrial; Freshwater; Marine|
|Continuing decline in area, extent and/or quality of habitat:||Unknown|
|Generation Length (years):||10.3|
|Movement patterns:||Full Migrant|
|Congregatory:||Congregatory (and dispersive)|
In Europe the species was heavily persecuted in the nineteenth century due to its consumption of fish, which resulted in competition with fishermen and fish farmers (Kushlan and Hancock 2005). Although killing at aquaculture farms has not reduced the global population so far (possibly because it is young birds that are mostly killed) (Kushlan and Hancock 2005), 800 herons are estimated to have died per year at Scottish fish-farms between 1984 and 1987 (Carss 1994, Kushlan and Hancock 2005) by being shot, drowned or poisoned by fish farmers (Carss 1994). Renewed hunting poses a threat to Bavarian populations by decreasing numbers to levels that inhibit recovery following severe winters (severe winters increase mortality rates for juveniles) (Kushlan and Hancock 2005). The species is vulnerable in Madagascar owing to its restricted range, exceedingly high levels of habitat alteration (from siltation and the need for agricultural land for rice and grazing) (Kushlan and Hafner 2000, Hafner and Kushlan 2002), hunting, and predation at nesting colonies (Kushlan and Hafner 2000, Kushlan and Hancock 2005). Timber harvesting is a threat throughout much of the species range by removing trees used by nesting colonies and/or disturbing nearby colonies (Kushlan and Hancock 2005). The species is also susceptible to avian influenza (Melville and Shortridge 2006) and avian botulism (van Heerden 1974), so may be threatened by future outbreaks of these diseases.
Utilisation The species is hunted and traded at traditional medicine markets in Nigeria (Nikolaus 2001).
|Citation:||BirdLife International. 2012. Ardea cinerea. The IUCN Red List of Threatened Species 2012: e.T22696993A40287322.Downloaded on 21 October 2016.|
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