Density, parasitism, and sexual reproduction are strongly correlated in lake Daphnia populations.
Density, parasitism, and sexual reproduction are strongly correlated in lake Daphnia populations.
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DOI：
10.1002/ece3.7847
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发表时间：
2021-08
影响因子：
2.6
通讯作者：
Duffy MA
中科院分区：
文献类型：
--
作者：
Gowler CD;Rogalski MA;Shaw CL;Hunsberger KK;Duffy MA
许多生物既可以无性繁殖，也可以有性繁殖。对于周期性孤雌生殖，无性生殖的时期被有性生殖的发作打断，从无性生殖到有性生殖的转变对适应度和种群动态有很大的影响。我们研究了Daphnia dentifera的种群，以确定有性生殖的投资量以及与性投资变化相关的因素。为此，我们跟踪了宿主密度，9种不同寄生虫的感染，以及15个湖泊种群的D.dentifera的有性生殖3年。有性生殖是季节性的，雄性和雌性的生产早在9月下旬就开始了，一般在11月增加。然而，在不同人群中，性个体的流行率存在很大差异，一些人群在整个研究期间完全保持无性，而另一些人群几乎完全转变为有性的女性和男性。我们发现密度，感染率，寄生虫物种丰富度和这些人群中的有性生殖之间有很强的关系。然而，密度，寄生和有性繁殖之间的强共线性意味着需要进一步的工作来解开这些关系背后的因果机制。湖泊种群的水蚤在性投资方面差异很大，有些种群在整个研究期间完全无性繁殖，而另一些种群在晚秋几乎完全转向有性繁殖。我们发现，更高的水蚤密度和寄生率与更大的性投资。
Many organisms can reproduce both asexually and sexually. For cyclical parthenogens, periods of asexual reproduction are punctuated by bouts of sexual reproduction, and the shift from asexual to sexual reproduction has large impacts on fitness and population dynamics. We studied populations of Daphnia dentifera to determine the amount of investment in sexual reproduction as well as the factors associated with variation in investment in sex. To do so, we tracked host density, infections by nine different parasites, and sexual reproduction in 15 lake populations of D. dentifera for 3 years. Sexual reproduction was seasonal, with male and ephippial female production beginning as early as late September and generally increasing through November. However, there was substantial variation in the prevalence of sexual individuals across populations, with some populations remaining entirely asexual throughout the study period and others shifting almost entirely to sexual females and males. We found strong relationships between density, prevalence of infection, parasite species richness, and sexual reproduction in these populations. However, strong collinearity between density, parasitism, and sexual reproduction means that further work will be required to disentangle the causal mechanisms underlying these relationships. Lake populations of Daphnia varied substantially in investment in sex, with some populations reproducing entirely asexually throughout the study period and others shifting almost entirely to sexual reproduction by late autumn. We found that higher Daphnia density and parasitism were associated with greater investment in sex.
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影响因子：
3.3
作者：
Busch, JW;Neiman, M;Koslow, JM
通讯作者：
Koslow, JM
影响因子：
3.3
作者：
Caceres, Carla E.;Hartway, Cynthia;Paczolt, Kimberly A.
通讯作者：
Paczolt, Kimberly A.
影响因子：
2.9
作者：
Ebert, D;Lipsitch, M;Mangin, KL
通讯作者：
Mangin, KL
DOI：
10.1098/rspb.2017.2176
发表时间：
2018-01-31
影响因子：
4.7
作者：
Gerber, Nina;Kokko, Hanna;Booksmythe, Isobel
通讯作者：
Booksmythe, Isobel
DOI：
10.1098/rstb.2017.0424
发表时间：
2018-10-05
影响因子：
6.3
作者：
Gerber, Nina;Kokko, Hanna
通讯作者：
Kokko, Hanna