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18/05/2018 - Asian tiger mosquito on the move

Frankfurt am Main / Germany, May 18th, 2018. Due to global trade and tourism, mosquitoes - transmitters of dangerous infectious diseases - have spread to almost every part of the world. Moreover, climate change promotes the spread of species that thrive under warmer temperatures even further. Scientists at the Goethe University and the Senckenberg Gesellschaft für Naturforschung have now compared the ecological niches of the Asian tiger mosquito and the yellow fever mosquito on various continents with the following result: “Due to its longer invasion time span of 300 to 400 years, the yellow fever mosquito has almost completely filled its niches in non-native areas, whereas the Asian tiger mosquito, with a shorter invasion time span of 30 to 40 years, has not yet arrived in all regions where they would find a suitable environment,” says Prof. Sven Klimpel.

Distribution Map Asian Tiger Mosquito
Worldwide expansion of the two invasive mosquito species
a) Asian tiger mosquito (Aedes albopictus) and
b) yellow fever mosquito (Aedes aegypti) and studied areas.
Copyright: Sven Klimpel

 “Over the next one to five decades, infectious diseases transmitted through vectors will increase” concludes Sven Klimpel’s team at the Goethe University and the Senckenberg Gesellschaft für Naturforschung. Vectors transmit agents that cause infectious diseases from a host to another organism without contracting the disease themselves. Many known vector species are native to tropical and subtropical regions. If vector species are established in a new area together with a disease agent, the area of risk for the associated disease will expand correspondingly.

Two prominent examples of vectors are the Asian tiger mosquito (Aedes albopictus) and the yellow fever mosquito (Aedes aegypti). The yellow fever mosquito is the main vector of the yellow fever virus, the dengue virus, the Zika virus and several other viral diseases. The tiger mosquito can also transmit the Zika virus and the dengue virus, but transmits other disease agents as well, such as the West Nile virus and the Chikungunya virus. These two medically relevant vectors are the focus of the current study in “Scientific Reports”.

The yellow fever mosquito, originally native to Africa, began to spread throughout the world 300 to 400 years ago – presumably with the expansion of sugar cane plantations and slave trade. The tiger mosquito, which today is considered one of the 100 worst invasive species, originally comes from South and Southeast Asia. Over the past several decades, it has been introduced and spread by trade and tourism, especially by the trade of automobile tires and lucky bamboo (Dracaena spp.). For example, tiger mosquito eggs, larva and pupae were transported great distances by sea, surviving in small water puddles inside used automobile tires, or in water containers for lucky bamboo.

Aedes albopictus
Asian tiger mosquito (Aedes albopictus) caught in Rovinj
(Croatia).Copyright: Dorian D. Dörge, Goethe-University

In their study, the scientists investigated the ecological niches of both species in their native and non-native range, i.e., the totality of environmental conditions in which a species can occur. In their new ranges of distribution, mosquitoes can encounter different environmental conditions than in their native ranges. Invasive mosquito species are said to be especially quick to adapt to new climatic conditions. The scientists, however, found no evidence to support this.

Both species occupy a broad niche and occur in a large number of different environmental conditions in their native ranges. Since similar climatic conditions prevail in the new distribution ranges, worldwide expansion cannot be explained by a niche expansion through adaptation, although local adaptation and genetic changes in species’ traits cannot be ruled out.

The scientists were, however, able to identify a difference between the two species: that time plays an important role in the expansion or invasion of a species. With its longer time span of invasion, the yellow fever mosquito almost completely fills its niche in the new, non-native distribution ranges; i.e. it occurs under many climatic conditions that also exist in its native distribution range.

Aedes albopictus Weibchen
Habitus of a female Asian tiger mosquito (Aedes
albopictus
). Copyright: Dorian D. Dörge, Goethe-University

The Asian tiger mosquito is a different case. In the new distribution ranges, it does not (yet) occur in all habitats that offer suitable climatic conditions. The researchers therefore predict a further expansion potential for this species in the future. Klimpel sumps up: “The Asian tiger mosquito can already be found in nearly all southern European countries, and due to its broad niche, it will inevitably spread and establish itself in northern Europe as well. Further exotic mosquito species such as Aedes japoniucs (East Asian bush mosquito), Aedes koreicus or Aedes atropalpus will follow - or have already arrived - in Central Europe.“

Contact

Prof. Dr. Sven Klimpel
Goethe-University & Senckenberg Biodiversity and Climate Research Centre
Tel. +49 (0)69 798-42237
Klimpel@bio.uni-frankfurt.de

Sabine Wendler
Press officer
Senckenberg Biodiversity and Climate Research Centre
Tel. +49 (0)69- 7542 1818
pressestelle@senckenberg.de

Publication

Cunze, S., Kochmann, J., Koch, L. K and Klimpel,S. (2018): Niche conservatism of Aedes albopictus and Aedes aegypti - two mosquito species with different invasion histories. Scientific Reports. doi: doi:10.1038/s41598-018-26092-2

Press images may be used at no cost for editorial reporting, provided that the original author’s name is published, as well.The images may only be passed on to third parties in the context of current reporting.

To study and understand nature with its limitless diversity of living creatures and to preserve and manage it in a sustainable fashion as the basis of life for future generations – this has been the goal of the Senckenberg Gesellschaft für Naturforschung (Senckenberg Nature Research Society) for 200 years. This integrative “geobiodiversity research” and the dissemination of research and science are among Senckenberg’s main tasks. Three nature museums in Frankfurt, Görlitz and Dresden display the diversity of life and the earth’s development over millions of years. The Senckenberg Nature Research Society is a member of the Leibniz Association. The Senckenberg Nature Museum in Frankfurt am Main is supported by the City of Frankfurt am Main as well as numerous other partners. Additional information can be found at www.senckenberg.de

Goethe University is a research-oriented university in the European financial centre Frankfurt The university was founded in 1914 through private funding, primarily from Jewish sponsors, and has since produced pioneering achievements in the areas of social sciences, sociology and economics, medicine, quantum physics, brain research, and labour law. It gained a unique level of autonomy on 1 January 2008 by returning to its historic roots as a "foundation university". Today, it is among the top ten in external funding and among the top three largest universities in Germany, with three clusters of excellence in medicine, life sciences and the humanities. Together with the Technical University of Darmstadt and the University of Mainz, it acts as a partner of the inter-state strategic Rhine-Main University Alliance. Internet: http://www.uni-frankfurt.de

 

 

 

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Dr. Sören Dürr
Tel.: 069 7542-1580

Judith Jördens
Tel.: 069 7542-1434
Mobil: 0172-5842340

Anna Lena Schnettler
Tel.: 069 7542-1561

Email:

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