Population stagnant growth caused by cryptic species of Brachionus plicatilis species complex

褶皱臂尾轮虫复合体的神秘物种导致种群增长停滞

• 批准号: 22780182
• 负责人: YOSHINAGA Tatsuki
• 金额: $ 2.58万
• 依托单位: Kitasato University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22780182/
• 关键词: シオミズツボワムシ; 初期餌料; 隠蔽種; 複合種; 分子系統; 生活史特性; 餌料生物; 種苗生産; 酸化ストレス耐性; 低温ストレス耐性; チトクロームオキシダーゼI; ユグロン; ミトコンドリアDNA

Rotifer Brachionus plicatilis has been an indispensable zooplankton as a live-food in aquaculture since 1960s. Three types of L, S and SS have been recognized based on their body size, but recent studies revealed that B. plicatilis consists of genetically-isolated species/strains, called species complex. Based on substitutions in the COI locus, the specimens examined in this study were classified into 5 genetically-isolated strains. Subsequently, the two strains of the L-type, Amami and Obama strain, were further investigated to compare their life-history parameters. The Amami strain showed relatively faster growth and maturation, but had lower stavation resistance than the Obama strain. These differences in their life-history suggested that the Amami and Obama strains could be considered to be r-and K-strategists, respectively. Such different adaptive behaviors between the two strains can cause the competition in the mass-culture, and resulted in the stagnant growth or even collapse of the population.

自20世纪60年代以来，褶皱臂尾轮虫一直是水产养殖中不可或缺的活食浮游动物。根据体型大小，已识别出 L、S 和 SS 三种类型，但最近的研究表明，褶皱芽孢杆菌由基因分离的物种/菌株组成，称为物种复合体。根据 COI 基因座的替换，本研究中检查的样本被分为 5 个基因分离菌株。随后，进一步研究了L型的两种菌株Amami和Obama菌株，以比较它们的生活史参数。奄美菌株表现出相对较快的生长和成熟，但比奥巴马菌株具有较低的抗饥饿性。这些生活史的差异表明，奄美和奥巴马菌株可以分别被视为 r 和 K 战略家。两种菌株之间的这种不同的适应行为会引起大众文化的竞争，并导致种群增长停滞甚至崩溃。

项目成果

シオミズツボワムシ複合種2株の生活史特性

两株潮水轮虫复合体的生活史特征

• 发表时间: 2012
• 作者: 島崎;田中;小磯;吉永
• 通讯作者: 吉永

Calorie restriction-induced maternal longevity is transmitted to their daughters in a rotifer

• DOI: 10.1111/j.1365-2435.2010.01773.x
• 发表时间: 2011-02-01
• 期刊: FUNCTIONAL ECOLOGY
• 影响因子: 5.2
• 作者: Kaneko, Gen;Yoshinaga, Tatsuki;Watabe, Shugo
• 通讯作者: Watabe, Shugo

酸化耐性を指標としたワムシ個体群の増殖不調の予知

以抗氧化性为指标预测轮虫种群生长衰竭

• 发表时间: 2012
• 作者: 田中;小磯;吉永
• 通讯作者: 吉永

Genetic identification and morphology of naturally spawned eggs of the Japanese eel Anguilla japonica collected in the western North Pacific

北太平洋西部日本鳗鲡自然产卵的遗传鉴定和形态

• DOI: 10.1007/s12562-011-0418-8
• 发表时间: 2011
• 期刊: Fisheries Science
• 影响因子: 1.9
• 作者: Yoshinaga;T.;et al.
• 通讯作者: et al.

酸化および低水温耐性試験によるワムシ個体群の増殖不良の予測

通过氧化和耐低水温试验预测轮虫种群生长不良

• 发表时间: 2011
• 作者: 吉永;臼井;石塚;田中;小磯
• 通讯作者: 小磯