Hybridizing Daphnia communities from ten neighbouring lakes: spatio-temporal dynamics, local processes, gene flow and invasiveness.
Hybridizing Daphnia communities from ten neighbouring lakes: spatio-temporal dynamics, local processes, gene flow and invasiveness.
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十个邻近湖泊的水蚤群落杂交：时空动态、局部过程、基因流和入侵
DOI：
10.1186/1471-2148-14-80
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发表时间：
2014-04-12
影响因子：
3.4
通讯作者：
Wolinska J
中科院分区：
文献类型：
--
作者：
Yin M;Gießler S;Griebel J;Wolinska J
在周期性孤雌生殖的自然群落中，通过在两种繁殖模式之间切换，能够对环境变化做出快速反应。虽然长时间的无性繁殖使一些克隆体能够战胜其他克隆体，并可能导致“克隆侵蚀”，但有性繁殖可以恢复这些系统中的遗传变异。此外，有性繁殖可能导致种间杂交的形成。这些杂交种可以通过无性繁殖达到高丰度。在本研究中，我们探讨了水蚤属水蚤的遗传变异。重点研究了水蚤杂交复合体中几个克隆组合的短期动态以及小空间尺度上基因流动的影响。15个微卫星标记表明，水蚤个体分别属于亲本种D. galeata和D. longispina，或者属于不同的杂交纲。亲本种的分布和基因型结构与湖区地理位置吻合较好，而杂交种的分布和基因型结构与湖区地理位置不一致。在亲本种内，galeata居群间的遗传距离小于longispina居群间的遗传距离。此外，galeata的优势与较高的磷负荷有关。最后，没有克隆侵蚀的证据。我们的研究结果表明，来自邻近10个湖泊的杂交水蚤群落的当代结构受到邻近栖息地殖民化事件以及环境因素的影响。然而，与亲本物种不同的是，几乎没有证据表明杂交物种的成功传播，它们似乎是在当地产生的。最后，与临时水蚤种群相比，在单个生长季节有时可以检测到克隆多样性的减少，这里观察到的高克隆多样性和克隆侵蚀的缺乏可能是由于有性繁殖的后代反复孵化的结果。总的来说，我们的研究提供了对一个新建立的湖泊系统中杂交水蚤物种复合体的时空动态的见解，并将种群的遗传相似性与环境因素增强的二次入侵情景联系起来。
In natural communities of cyclical parthenogens, rapid response to environmental change is enabled by switching between two reproduction modes. While long periods of asexual reproduction allow some clones to outcompete others, and may result in “clonal erosion”, sexual reproduction restores genetic variation in such systems. Moreover, sexual reproduction may result in the formation of interspecific hybrids. These hybrids can then reach high abundances, through asexual clonal reproduction. In the present study, we explored genetic variation in water fleas of the genus Daphnia. The focus was on the short-term dynamics within several clonal assemblages from the hybridizing Daphnia longispina complex and the impact of gene flow at small spatial scales. Daphnia individuals belonged either to the parental species D. galeata and D. longispina, or to different hybrid classes, as identified by 15 microsatellite markers. The distribution and genotypic structure of parental species, but not hybrids, corresponded well with the geographical positions of the lakes. Within parental species, the genetic distance among populations of D. galeata was lower than among populations of D. longispina. Moreover, D. galeata dominance was associated with higher phosphorous load. Finally, there was no evidence for clonal erosion. Our results suggest that the contemporary structure of hybridizing Daphnia communities from ten nearby lakes is influenced by colonization events from neighbouring habitats as well as by environmental factors. Unlike the parental species, however, there was little evidence for successful dispersal of hybrids, which seem to be produced locally. Finally, in contrast to temporary Daphnia populations, in which a decrease in clonal diversity was sometimes detectable over a single growing season, the high clonal diversity and lack of clonal erosion observed here might result from repeated hatching of sexually produced offspring. Overall, our study provides insights into spatio-temporal dynamics in a hybridizing Daphnia species complex in a recently established lake system, and relates genetic similarities of populations to a scenario of secondary invasion enhanced by environmental factors.
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影响因子：
4.8
作者：
Mergeay, Joachim;De Meester, Luc;Verschuren, Dirk
通讯作者：
Verschuren, Dirk
影响因子：
8.8
作者：
Chao, A;Chazdon, RL;Shen, TJ
通讯作者：
Shen, TJ
DOI：
10.1111/j.1471-8286.2005.01218.x
发表时间：
2006-06-01
期刊：
MOLECULAR ECOLOGY NOTES
影响因子：
--
作者：
Brede, N;Thielsch, A;Schwenk, K
通讯作者：
Schwenk, K
影响因子：
2.6
作者：
Excoffier, Laurent;Laval, Guillaume;Schneider, Stefan
通讯作者：
Schneider, Stefan
DOI：
10.1073/pnas.0807187106
发表时间：
2009-03-24
影响因子：
11.1
作者：
Brede, Nora;Sandrock, Christoph;Schwenk, Klaus
通讯作者：
Schwenk, Klaus