Prior residency does not always pay off - co-infections in Daphnia
Prior residency does not always pay off - co-infections in Daphnia
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DOI：
10.1017/s0031182010000296
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发表时间：
2010-09-01
期刊：
影响因子：
2.4
通讯作者：
Wolinska, Justyna
中科院分区：
文献类型：
--
作者：
Lohr, Jennifer N.;Yin, Mingbo;Wolinska, Justyna
控制多物种合并感染成功的流行病学和生态过程尚未得到解决。在这里，我们调查了先前与晚期的居住在主机内，这意味着寄生虫首先接触主机，以确定主机内竞争的结果是否改变。我们感染了一个单一的基因型的水蚤galeata与肠道原生动物Caullerya mesnili和血淋巴真菌Metschnikowia属（每个寄生虫物种的单一基因型），作为单一感染，同时合并感染和顺序合并感染，与每个寄生虫给予4天前居住。同时合并感染的毒力显着高于单次感染和连续的合并感染，作为衡量主机寿命和繁殖力下降。此外，除了水蚤宿主，寄生虫也遭受健身减少同时共感染，孢子生产。然而，连续的合并感染具有混合效应：mesnili受益于先前的居住，而Metschnikowia sp.经历了健身下降。我们的研究结果表明，水蚤的多个物种的共同感染可能比单一感染更具毒性，并且先前的居住并不总是提供竞争优势。
The epidemiological and ecological processes which govern the success of multiple-species co-infections are as yet unresolved. Here we investigated prior versus late residency within hosts, meaning which parasite contacts the host first, to determine if the outcomes of intra-host competition are altered. We infected a single genotype of the waterflea Daphnia galeata with both the intestinal protozoan Caullerya mesnili and the haemolymph fungus Metschnikowia sp. (single genotype of each parasite species), as single infections, simultaneous co-infections and as sequential co-infections, with each parasite given 4 days prior residency. Simultaneous co-infections were significantly more virulent than both single infections and sequential co-infections, as measured by a decreased host life span and fecundity. Further, in addition to the Daphnia host, the parasites also suffered fitness decreases in simultaneous co-infections, as measured by spore production. The sequential co-infections, however, had mixed effects: C. mesnili benefited from prior residency, whereas Metschnikowia sp. experienced a decline in fitness. Our results show that multiple-species co-infections of Daphnia may be more virulent than single infections, and that prior residency does not always provide a competitive advantage.