Anopheles plumbeus - Factsheet for experts
SPECIES NAME/CLASSIFICATION:Anopheles plumbeus Stephens 1828
COMMON NAMES/SYNONYMS: Anopheles corsicanus Edwards, 1928; Anopheles intermedius Shingarev, 1928; Anopheles nigripes Staeger, 1839
Hazards associated with species
Continued growth of this species in urban habitats could potentially increase contact with humans .
This species is a known persistent biter of humans. It is suspected of having contributed to malaria transmission in the past and has been shown to be a competent vector of both tropical and Eurasian strains of malaria.
Anopheles plumbeus is distributed throughout Europe, the Caucasus, the Middle East, Iran and Iraq and in North Africa . This mosquito has been found in nearly all European countries, including Scandinavia and Italy, and also in the western Himalayas .
Anopheles plumbeus distribution: Albania, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, France (including Corsica), Germany, Greece, Hungary, Ireland, Italy (including Sardinia and Sicily), Liechtenstein, Lithuania, Luxembourg, Macedonia, Moldova, Montenegro, Netherlands, Poland, Portugal, Romania, Russia, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey, Ukraine and United Kingdom .
This mosquito species has begun to utilise artificial breeding sites which have helped it to expand into more suburban and urban areas in Europe.
- SPECIES NAME/CLASSIFICATION:Anopheles plumbeus Stephens 1828
- COMMON NAMES/SYNONYMS: Anopheles corsicanus Edwards, 1928; Anopheles intermedius Shingarev, 1928; Anopheles nigripes Staeger, 1839
Morphological characteristics/similar species
Adult females of Anopheles plumbeus can be distinguished from Anopheles claviger by their smaller size, darker colouration, long-haired antennae and more densely scaled wings [2,4].
Larvae of Anopheles plumbeus are easily distinguishable from other species in Europe by examining the frontal setae which are single and reduced in size .
Life history: diapausing tendencies, seasonal abundance, flight range and voltinism
Eggs are not laid on the water surface but on the sides of potential breeding habitats, just above the waterline, so the number of generations produced each year often depends upon hydrological conditions. Overwintering takes place in the egg or larval stages, which can survive long periods of water-freezing. Adults of Anopheles plumbeus in Europe are found from late spring until the end of September .
This species has a longevity of up to two months .
This species is known to be a particularly aggressive biter, feeding at any time of the day on different mammalian hosts, including humans and on birds and reptiles .
Larvae of Anopheles plumbeus can be found in water-filled tree-holes with a high salt concentration and deficiency of oxygen . Larvae have been found in water at rot-holes on beech, birch, horse chestnut, elm, oak, sycamore, hornbeam and silver fir trees, from 0.5 to 6.0 metres above the ground . Larvae can also be found in artificial containers, such as tyres, rainwater casks and cemetery vases . In Spain, Anopheles plumbeus is well distributed, having been found for the first time in the country in 1909 in Madrid . It has been found breeding in tree holes (e.g. white and black poplar trees) and artificial containers . A recent survey revealed the presence of this species in water in a plastic bag near several tree-hole breeding sites .
More recently, the species has adapted its breeding habits to utilise artificial breeding sites such as catch basins or septic tanks . In north-eastern France, large numbers of larvae have been found in pits collecting rainwater and liquid manure . Larvae have also recently (2010) been collected from artificial containers in urban areas in Albania (E. Velo, personal communication). This species has also been associated with abandoned manure tanks and un-cleaned stables with broken roofing where water has collected .
Adults are generally associated with rural habitats such as forests (due to the species being a tree-hole breeder), but it is becoming increasingly common in urban areas including urban parks . The adaptation of Anopheles plumbeus to human-created habitats, particularly abandoned and un-cleaned pig housing where mosquitoes breed in manure pools, has contributed significantly to increases in serious nuisance biting in Belgium . Research in Switzerland and Liechtenstein showed that most specimens were collected in urban/suburban areas . In Belgium, Anopheles plumbeus is present in urban, rural, natural and importation-risk habitats; harbours, airports, and importation company premises .
Adult female Anopheles plumbeus are persistent biters, being most active during the crepuscular period but also reported as massive biting nuisance during the day . Some populations have shown a strong anthropophilic preference .
In some settings in central Europe, this species has become a major nuisance biter in areas where unused septic tanks support mass breeding . Pits collecting liquid manure or rainwater in urban areas are also known to support large numbers of larvae and have been associated with persistent nuisance biting .
Larvae can survive long periods when the water surface is frozen but some mortality is seen if the entire water column becomes frozen .
It remains unknown whether the change in breeding habits implies ecotypic differentiation from natural populations across Europe .
Epidemiology & transmission of pathogens
Known vector status
Anopheles plumbeus has been implicated in malaria transmission in forests at Caucasian resorts , was suspected of being responsible for two locally acquired cases in London , two cases reported in Germany  and also for cases among forest workers in the Slavonian mountains of north-east Croatia (E, Merdić, personal communication).
Anopheles plumbeus is considered to be an efficient carrier of malaria (Eurasian strains of Plasmodium vivax and tropical strains of Plasmodium falciparum ) but is thought to be of minor importance in transmission due to its ecology . In Spain it has never been found involved in malaria transmission  or arbovirus transmission .
A recent study demonstrated laboratory infection of Anopheles plumbeus females (from Switzerland) with a tropical strain of Plasmodium falciparum, showing an overall infectivity of 94% (45 out of 48 individuals) in one experiment , suggesting that this species could play a significant role in local transmission of imported malaria. Experimental data have shown that British Anopheles plumbeus are susceptible to infection with Plasmodium falciparum, at least to the oocyst stage, but malaria outbreaks in Britain are thought to be very unlikely .
The laboratory transmission of West Nile Virus by Anopheles plumbeus has been reported . Because of its ornithophagic and anthropophagic behaviour, Anopheles plumbeus is considered to be a potential bridge vector for the transmission of West Nile Virus from birds to humans . Based on the mosquito’s habitat range, it is not predicted to be associated with West Nile Virus transmission in Italy .
Public health (surveillance/ control)
Activities in Europe
Various countries have set up nationwide surveillance schemes to establish baseline species distribution and detect changes in distribution/introductions of new species. Such schemes have included targeted surveillance for this species (e.g. Italy, Spain). The information is currently shared with VBORNET partners and collaborators via the network.
CO2-baited mosquito magnet traps are thought to be the most effective method of collecting adult mosquitoes . Larval dipping is common for the collection of immature stages from aquatic breeding habitats .
Species-specific control methods
Control measures have been used to reduce biting nuisance in urban areas where the species has been associated with breeding in large pits. Such measures include: removing the liquid from the pits or applying a biological larvicide based on Bacillus sphaericus .
The German mosquito control agency (KABS) monitors this species and applies tablets of Bacillus thuringiensis israelensis to treat cesspools and water containers. Several million tablets are used annually, greatly reducing mosquito numbers in urban areas .
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