Host-parasite 'Red Queen' dynamics archived in pond sediment

被引:475
作者
Decaestecker, Ellen
Gaba, Sabrina
Raeymaekers, Joost A. M.
Stoks, Robby
Van Kerckhoven, Liesbeth
Ebert, Dieter
De Meester, Luc
机构
[1] Katholieke Univ Leuven, Lab Aquat Ecol & Evolut Biol, B-3000 Louvain, Belgium
[2] Katholieke Univ Leuven, Lab Anim Biodivers & Systemat, B-3000 Louvain, Belgium
[3] Katholieke Univ Leuven, Interdisciplinary Res Ctr, B-8500 Kortrijk, Belgium
[4] Univ Basel, Inst Zool, CH-4053 Basel, Switzerland
[5] INRA, UR1282, F-37380 Nouzilly, France
关键词
D O I
10.1038/nature06291
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Antagonistic interactions between hosts and parasites are a key structuring force in natural populations, driving coevolution(1,2). However, direct empirical evidence of long-term host-parasite coevolution, in particular `Red Queen' dynamics-in which antagonistic biotic interactions such as host-parasite interactions can lead to reciprocal evolutionary dynamics-is rare(3-5), and current data, although consistent with theories of antagonistic coevolution, do not reveal the temporal dynamics of the process(6). Dormant stages of both the water flea Daphnia and its microparasites are conserved in lake sediments, providing an archive of past gene pools. Here we use this fact to reconstruct rapid coevolutionary dynamics in a natural setting and show that the parasite rapidly adapts to its host over a period of only a few years. A coevolutionary model based on negative frequency-dependent selection, and designed to mimic essential aspects of our host parasite system, corroborated these experimental results. In line with the idea of continuing host-parasite coevolution, temporal variation in parasite infectivity changed little over time. In contrast, from the moment the parasite was first found in the sediments, we observed a steady increase in virulence over time, associated with higher fitness of the parasite.
引用
收藏
页码:870 / U16
页数:5
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