Competitive abilities and distribution ranges of four asexual Daphnia pulex lineages and Daphnia mitsukuri in Eurasian continental islands.
Competitive abilities and distribution ranges of four asexual Daphnia pulex lineages and Daphnia mitsukuri in Eurasian continental islands.
复制标题
欧亚大陆岛屿四种无性水蚤谱系和水蚤的竞争能力和分布范围。
DOI：
10.1002/1438-390x.12054
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发表时间：
2020
影响因子：
1.7
通讯作者：
Urabe Jotaro
中科院分区：
文献类型：
--
作者：
Maruoka Natsumi;Urabe Jotaro
蚤属Daphnia pulex和D.日本的Daphnia pulexin日本的Daphnia pul虽然该物种在日本全境均有分布，但JPN 1的分布范围最大，其次是JPN 2。由于水蚤属同一藻类食物，四种无性生殖水蚤的分布范围不同. pulexlineages和D. mitsukurin可能是由于对藻类食物的剥削性竞争造成的。为了检验这种可能性，我们测量了零净增长率下的阈值食物浓度（TFC）和50%个体生存所需的食物浓度（FC50）。此外，我们还研究了温度对四种无性繁殖D的体细胞生长速率（SGR）和死亡率的影响。pulexlineages和D.光栗实验结果表明，黑腹锦鸡儿JPN 1的TFC值最低，而光栗锦鸡儿的TFC值最高，这支持了JPN 1的分布范围最大是由于其在谱系间竞争中的优势，而黑腹锦鸡儿的分布范围最大是由于其在谱系间竞争中的优势。mitsukuriis通过与D.蚤。然而，虽然JPN 2在相对较大的区域发现，但它的总挥发系数高于JPN 3和JPN 4，后者出现在非常有限的区域。这些结果清楚地表明，分布范围的差异很大。血统不一定仅仅由它们的竞争优势决定。
Daphnia pulexandD. mitsukuriare morphologically similar and distributed in small lowland Japanese lakes.Daphnia pulexin Japan reproduces by obligate parthenogenesis and is composed of four different lineages (JPN1–JPN4) with North American origins. Although this species is found throughout Japan, JPN1 has the largest distribution range, followed by JPN2.Daphnia mitsukuriis a putatively endemic species that is now rarely found in Japan. SinceDaphniashare the same algal food, the difference in distribution ranges among the four asexualD. pulexlineages andD. mitsukurimay be caused by exploitative competition for algal food. To examine this possibility, we measured the threshold food concentration (TFC) at zero‐net growth rate and the food concentration required for 50% of the individuals to survive (FC50). In addition, we examined the effects of temperature on the somatic growth rate (SGR) and the mortality rates of four asexualD. pulexlineages andD. mitsukuri. The experiments showed that TFC was lowest inD. pulexJPN1 and highest inD. mitsukuri, supporting the idea that the largest distribution range of JPN1 is due to its superiority in inter‐lineage competition, and that the distribution area ofD. mitsukuriis reduced through exploitative competition withD. pulex. However, although JPN2 was found in relatively large areas, it had higher TFC than JPN3 and JPN4, which appear in very limited areas. These results clearly showed that the difference in distribution ranges amongD. pulexlineages are not necessarily determined by their competitive superiority alone.