2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009

20 December 2012

Die neue Weltordnung der Tiere: Wallace-Karte nach fast 150 Jahren aktualisiert...

18 December 2012

(Fleder)Mäuse als Krankheitsüberträger - Untersuchungen zu Vektoren in Hessens Wäldern...

03 December 2012

Rapid test to save lives of snakebite victims . New diagnostic test awarded 1st prize at the Göttingen Innovation Competition...

22 November 2012

Online-Portal zum Klimawissen wächst...

20 November 2012

Midges in a heat-based test of endurance – evolutionary history determines adaptability to high temperatures...

11 October 2012

„Feed the World 2050“ – Veranstaltung zum Welternährungstag 2012: Wie ernährt man neun Milliarden Menschen nachhaltig? Ernährungssicherung der Zukunft...

21 September 2012

Schutz für die Heimat der Drachenblutbäume: BiK-F, Senckenberg, GIZ und jemenitische Umweltagentur vereinbaren Zusammenarbeit im UNESCO-Weltnaturerbe Sokotra...

17 September 2012

Veranstaltungdreiklang: Vorträge und Diskussionen zur Nachhaltigkeit ...

14 September 2012

Teamwork in the tropics – pollinators and frugivores are less choosy at the equator...

04 September 2012

Pinguine in der Patsche: Neue Zahlen zu Pinguin-Rückgang auf sich erwärmender Antarktischer Halbinsel...

30 August 2012

Klimaentwicklung ist keine Einbahnstraße - Tiefsee-Bohrungen zeigen langfristige Entwicklung des CO2-Kreislaufs...

01 August 2012

Tropical climate in the Antarctic: Palm trees once thrived on today’s icy coasts 52 million years ago...

06 July 2012

Outstanding for the past 15 million years – the Swiss Alps have influenced Europe’s climate since the Miocene ...

05 July 2012

Pilze für die Zukunft: Neuer LOEWE-Schwerpunkt „Integrative Pilzforschung (IPF)“...

28 June 2012

Tree trumps grass to rule the savannas...

26 June 2012

Auf Mückenfang im Auftrag der Wissenschaft - Frankfurter Wissenschaftler unterstützen „Jugend forscht!“ Projekt in Bad Vilbel...

25 June 2012

Vortrag: Tropenkrankheiten – jetzt auch in Europa?...

11 June 2012

Vortrag im Senckenberg: Toxische Lebensretter - Einsatz von Tiergiften in der modernen Arzneiforschung ...

04 June 2012

Unscheinbar und doch gewaltig: Flechten, Algen und Moose sind Großspeicher für Stickstoff und Kohlendioxid...

31 May 2012

Biodiversität und Klima Forschungszentrum vereinbart Kooperation mit Nationalpark Kellerwald-Edersee...

25 May 2012

Allergie durch Klimawandel? - Vortrag aus der Reihe „Natur wirkt!?“...

14 May 2012

Vortrag: Gesundes Stadtgrün – wie Park und Co. unsere Lebensqualität steigern...

10 May 2012

Globaler Online-Atlas der Arten – Großprojekt „Map of Life“ geht an den Start...

07 May 2012

Der BIOTA West Atlas – 10 Jahre Biodiversitätsforschung in einem Buch ...

26 April 2012

Gefährliche Gäste – Parasiten: Vortrag aus der Reihe „Natur wirkt!?“...

24 April 2012

Ein genetischer Personalausweis für Pilze...

20 April 2012

Polar bears are evolutionarily older and genetically more distinct than previously known: ancestry traced back to 600,000 years ago...

17 April 2012

Evolution: Vangas beat Darwin’s finches in diversity ...

10 April 2012

Vortrag: Medizin am seidenen Faden – neue Anwendungsgebiete für Spinnen...

22 March 2012

Viren aus dem Regenwald - Vortrag aus der Reihe „Natur wirkt!?“...

12 March 2012

Neue Senckenberg-Vortragsreihe „Natur wirkt?!“...

29 February 2012

Standing still in running water - Lotic dragon- and damselfly species are less able to track climate change...

24 February 2012

Blick aufs große Ganze – Jahrestagung des Arbeitskreises Makroökologie der Gesellschaft für Ökologie ...

06 February 2012

Klimawandel: Warum aus Wissen so wenig Handeln wird – Podiumsdiskussion mit Harald Welzer und Hans-Werner Sinn...

24 January 2012

Where there’s a worm there’s a whale – First distribution model of marine parasites provides revealing insights...

23 January 2012

Rahmstorf kommt...

10 January 2012

Rettet uns Geo-Engineering vor dem Klimawandel? ...

05 January 2012

Inselhopping zahlt sich aus - Studie unterstreicht Bedeutung des Verbreitungsgebiets bei der Artbildung ...

Press Releases

Midges in a heat-based test of endurance – evolutionary history determines adaptability to high temperatures

Frankfurt am Main, 20 November 2012. Whether midges can reproduce successfully at high temperatures depends closely on their evolutionary history. Accordingly, the manner in which they deal with heat stress depends not only on whether a representative of this midge species comes from northern or southern Europe and is therefore more accustomed to higher temperatures. This was reported recently by scientists from the Biodiversity and Climate Research Centre (BiK-F) at the Goethe University and the Senckenberg Research Institute in the specialist journal “Oecologia”. In order to judge the effect of global climate change, it is therefore necessary to observe both climatic and genetic data.

The team led by Prof. Markus Pfenninger, Goethe University and Biodiversity and Climate Research Centre (BiK-F) and Dr. Carsten Nowak, Senckenberg Research Institute and BiKF, collected midge larvae of the widespread species Chironomus riparius in southern, central and northern Europe and reared them at three different constant temperatures in the laboratory. The 20, 24 or 28 °C chosen for the experiment represent approximately the average temperatures faced by the midge larvae at their place of origin during the main breeding period in summer. The result: the number of larvae that ultimately grow into midges at the same temperature depends firstly on the origin of the population. Secondly, the warmer it is, the poorer the chances of breeding success for the population in general, but to different degrees.

“The relative breeding success within species therefore depends on how high the average summer temperatures are in the places of origin,” explains Pfenninger. Midge populations from Portugal and southern France, which are exposed to higher average temperatures in summer, were therefore more successful breeders at higher temperatures in the experiment. This indicates local adjustment to local climate conditions.

The additional examination of the genotype of the midge also shows that the breeding success is not only explained by the temperature in the place of origin, but also by the population history and the extent of existing genetic variability. In addition to natural selection, chance also plays a role here, because in a new population established by only a few individuals, not all genetic variants are represented. Due to population size fluctuations caused by environmental conditions, in separate populations some genetic variants disappear, others are newly generated by mutations. Caused by this genetic variability, populations of one species often exhibit different characteristics. Moreover, the extent of existing genetic variability is of importance: the higher it is, the better the population is able to resist to stress and to adapt to changing conditions.

The team sees the findings as an important step towards a better understanding of climate adaptation. “The study shows that both the population history and the climate of their previous habitat must be observed in order to be able to predict how a species will react to climate warming,” summarises co-author Dr Carsten Nowak. Midges are particularly interesting research objects, as they have settled a large habitat, which – if we compare, for example, southern and northern Europe – encompasses a difference in temperature of up to 10 degrees Celsius. At the same time their bodily temperature is controlled solely by the external temperature. The next step will be to examine the genotype of midges for adaption in metabolism, so that the differences between the populations can also be explained functionally.

Press images:

 Chironomus riparius
Living at freshwaters all over Europe – the midge Chironomus riparius. ©B. ValentineZum Download in 300 dpi Available in 300 dpi at
http://www.bik-f.de/images/aktuelles/photos_pressemeldungen/50440412_f1e0c70458_o_300dpi.jpg


 Rearing midges
Rearing midges at the laboratory: The larvae live in the sandy sediment in a small aquarium. © M. Pfenninger Available in 300 dpi at
http://www.bik-f.de/images/aktuelles/photos_pressemeldungen/imgp3708_300.jpg

Terms of use:  Images may be used for editorial purposes only. Please state the copyright information as given in the image caption. Use of images for commercial purposes prohibited.

For further information please contact:
Prof. Dr. Markus Pfenninger
LOEWE Biodiversity and Climate Research Center
Phone +49 (0)69 798 24714
Pfenninger@bio.uni‐frankfurt.de

or

Dr. Julia Krohmer
LOEWE Biodiversity and Climate Research Center (BiK‐F), Transfer office
Phone +49 (0)69 7542 1837
julia.krohmer@senckenberg.de

Paper:
Nemec, Sabrina; Patel, Simit; Nowak, Carsten & Pfenninger Markus. Evolutionary determinants of population differences in populations growth rate x habitat temperature interactions in Chironomus riparius (2012): Oecologia, doi: 10.1007/s00442-012-2517-3

download PDF, 152 KB