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Université de Fribourg

Parasite‐driven replacement of a sexual by a closely related asexual taxon in nature

Lohr, Jennifer N. ; Haag, Christoph R.

In: Ecology, 2020, vol. 101, no. 10, p. -

Asexual species are thought to suffer more from coevolving parasites than related sexuals. Yet a variety of studies do not find the patterns predicted by theory. Here, to shine light on this conundrum, we investigate one such case of an asexual advantage in the presence of parasites. We follow the frequency dynamics of sexual and asexual Daphnia pulex in a natural pond that was initially...

  • LOHR 1,2,3,5 AND CHRISTOPH R....
  • Haag, C....
  • Haag, C....
  • Robinson, Christoph R....
  • Haag, David W....
  • Ebert D, Haag C, Kirkpatrick M, Riek M, Hottinger JW, Pajunen VI. 2002....
  • May 9, 2008: A Sierre mardi, Christoph Blocher était sur les lieux du «crime»....
  • Jan 25, 2008: Voilà deux mois la Suisse s'offrait un psychodrame en ne réélisant pas Christoph Biocher au Conseil fédéral....
  • May 9, 1997: Mùller Orsières marchent Char: «La ronde des festivals» 1882-1997 Willy Haag L'Abeille, Riddes Le Commandant Martin Carron La Liberté, Fully Joyeux Retour Martin Carron L'Helvétienne, Saillon Route Libre Groupe : 125 e anniversaire» 1872-1997 A.J....
  • See the 24 results in the newspaper "Confédéré"
Print Media
140 ans, 41000 éditions
Bibliothèque publique et universitaire

L'Impartial

La Chaux-de-Fonds : L'Impartial, 1880

No spécimen [0] (27.12.1880); no 1 (1.1.1881) -

  • Oct 13, 2016: Marc-André et Christianne Wuillemin-Frossard, leurs enfants Sébastien et Rebecca Wuillemin-Banderet, leurs filles Rose et Cécile Sandrine et Jérémy Haag-Wuillemin leurs enfants Mattys et Nora Les descendants de feu Alphonse et Ida Wuillemin Les descendants de feu Joseph et Elsa Bader ainsi que les familles parentes, alliées et amies La Chaux-de-Fonds, le 7 octobre 2016 La cérémonie d’adieu a eu lieu dans l’intimité de la famille....
  • Oct 12, 2016: Avec Christophe Lambert....
  • Sep 29, 2016: Arbitres: Stricker/Unterfinger, Haag/Wüst....
  • See the 1'800 results in the newspaper "L'Impartial"
  • Oct 13, 2016: Marc-André et Christianne Wuillemin-Frossard, leurs enfants Sébastien et Rebecca Wuillemin-Banderet, leurs filles Rose et Cécile Sandrine et Jérémy Haag-Wuillemin leurs enfants Mattys et Nora Les descendants de feu Alphonse et Ida Wuillemin Les descendants de feu Joseph et Elsa Bader ainsi que les familles parentes, alliées et amies La Chaux-de-Fonds, le 7 octobre 2016 La cérémonie d’adieu a eu lieu dans l’intimité de la famille....
  • Oct 12, 2016: Avec Christophe Lambert....
  • Sep 29, 2016: Arbitres: Stricker/Unterfinger, Haag/Wüst....
  • See the 1'466 results in the newspaper "L'Express"
Université de Fribourg

Genetic estimates of population age in the water flea, Daphnia magna

Robinson, John D. ; Haag, Christoph R. ; Hall, David W. ; Pajunen, V. Ilmari ; Wares, John P.

In: Journal of Heredity, 2012, vol. 103, no. 6, p. 887-897

Genetic datasets can be used to date evolutionary events, even on recent time scales if sufficient data are available. We used statistics calculated from multilocus microsatellite datasets to estimate population ages in data generated through coalescent simulations and in samples from populations of known age in a metapopulation of Daphnia magna in Finland. Our simulation results show that age...

  • Robinson, Christoph R....
  • Haag, David W....
  • Ebert D, Haag C, Kirkpatrick M, Riek M, Hottinger JW, Pajunen VI. 2002....
Université de Fribourg

Nucleotide polymorphism and within-gene recombination in Daphnia magna and D. pulex, two cyclical parthenogens

Haag, Christoph R. ; McTaggart, Seanna J. ; Didier, Anaïs ; Little, Tom J. ; Charlesworth, Deborah

In: Genetics, 2009, vol. 182, p. 313-323

Theory predicts that partially asexual organisms may make the "best of both worlds": for the most part, they avoid the costs of sexual reproduction, while still benefiting from an enhanced efficiency of selection compared to obligately asexual organisms. There is, however, little empirical data on partially asexual organisms to test this prediction. Here we examine patterns of nucleotide...

  • Haag, M....
  • Haag, C....
  • Haag et al....
Université de Fribourg

Genotypic selection in Daphnia populations consisting of inbred sibships

Haag, Christoph ; Hebert, Dieter

In: Journal of Evolutionary Biology, 2007, vol. 20, no. 3, p. 881–891

The genetic basis of fitness reduction associated with inbreeding is still poorly understood. Here we use associations between allozyme genotypes and fitness to investigate the genetic basis of inbreeding depression in experimental outdoor populations of the water flea, Daphnia magna. In Daphnia, a phase of clonal reproduction follows hatching from sexually produced resting eggs,...

  • HAAG* à & D....
  • https://doc.rero.ch Introduction Inbreeding depression is the reduction in fitness as a result of increased homozygosity of offspring from Correspondence: Christoph Haag, University of Edinburgh, Institute of Evolutionary Biology, Ashworth Lab. 2, West Mains Rd, Edinburgh EH9 3JT, UK....
  • Haag, C.R., Riek, M., Hottinger, J.W., Pajunen, V.I. & Ebert, D. 2005....
Université de Fribourg

Parasite-mediated selection in experimental metapopulations of Daphnia magna

Haag, Christoph R. ; Ebert, Dieter

In: Proceedings of the Royal Society of London: Biological Sciences, 2004, vol. 271, p. 2149-2155

In metapopulations, only a fraction of all local host populations may be infected with a given parasite species, and limited dispersal of parasites suggests that colonization of host populations by parasites may involve only a small number of parasite strains. Using hosts and parasites obtained from a natural metapopulation, we studied the evolutionary consequences of invasion by single strains...

  • Haag and D....
  • Haag, C....
  • Haag, C....
Université de Fribourg

A new hypothesis to explain geographic parthenogenesis

Haag, Christoph R. ; Ebert, Dieter

In: Annales Zoologici Fennici, 2004, vol. 41, no. 4, p. 539-544

In many plants and animal species, asexuals are more common in marginal habitats such as high latitudes or altitudes than their closely related sexual counterparts. Here we propose a new hypothesis to explain this pattern called "geographic parthenogenesis". In marginal habitats, populations may often exist as metapopulations with high degrees of subdivision and local extinction and ...

  • In central Scandina- 542 Haag & Ebert • ANN....
  • Haag, C....
  • Haag & Ebert • ANN....