| Presentation Detail
Species Interactions and Coevolution Vergara, Daniela [1], Lively, Curt [2], King, Kayla Christina [3], Jokela, Jukka [4]. The geographic mosaic of sex and infection at multiple spatial scales. Understanding how sexual and asexual forms of the same species coexistis a challenge for evolutionary biology. The Red Queen hypothesis predicts thatsex is favored by parasite-mediated selection against common asexual genotypes,leading to the coexistence of sexual and asexual hosts. In a geographic mosaic,where the risk of infection varies in space, the theory also predicts thatsexual reproduction would be positively correlated with disease prevalence. Wetested this hypothesis in lake populations of a New Zealand freshwater snail, Potamopyrgus antipodarum, by comparingpairwise difference matrices for infection frequency and male frequency usingpartial Mantel tests. We conducted the test at three spatial scales: amonglakes on the South Island, among depths within an intensively sampled lake(Lake Alexandrina), and within depths at Lake Alexandrina. We found that thedifference in infection risk and the difference in the proportion of sexualsnails were significantly and positively correlated at all spatial scales. Ourresults thus suggest that parasite-mediated selection contributes to thelong-term coexistence of sexual and asexual individuals in coevolutionaryhotspots, and that the “warmth” of hotspots can vary on small spatial scales.
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1 - Indiana University Bloomington, Biology, 1001 east third st, Biology, Jordan Hall, Lab 117, Bloomington, Indiana, 47405, United States
2 - Indiana University, Biology, 1001 E. Third Street, Bloomington, IN, 47405, USA
3 - University of Liverpool, Institute of Integrative Biology, Crown Street , Liverpool, L69 7ZB, UK
4 - EAWAG, ETH, Institute of Integrative Biology, Überlandstrasse 133, Dübendorf, Uster, 8600 , Switzerland
Keywords:
Potamopyrgus antipodarum
Coevolution
host-parasite
Red Queen Hypothesis.
Presentation Type: Regular Oral Presentation
Session: 99
Location: Cotton B/Snowbird Center
Date: Monday, June 24th, 2013
Time: 8:45 AM
Number: 99002
Abstract ID:517
Candidate for Awards:W.D. Hamilton Award for Outstanding Student Presentation |
