海带双环藻（层藻纲，辉绿藻科）孢子传播的局部与区域模式

IF 1.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Phycological Research Pub Date : 2024-08-07 DOI:10.1111/pre.12563

Haruka Suzuki, Tomoya Aoki, Chika Mitsuyuki, Yoshihisa Suyama, Yukio Agatsuma, Masakazu N. Aoki

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引用次数: 0

摘要

摘要人们普遍认为，海带种群具有元种群结构。大多数子孢子在其亲本个体附近定居，子孢子的远距离传播并不频繁，但却促进了当地种群之间的基因流动。通过 MIG-seq（即多重简单序列间重复序列基因分型测序法）对两个地区的优势海带（Eisenia bicyclis）进行了单核苷酸多态性基因分型的种群遗传分析：对两个地区的优势海藻--双列栉孔海藻（Eisenia bicyclis）进行了基因分型分析，这两个地区分别是 Kitsunezaki（遮蔽区）和 Shimoda（暴露区）。对北unezaki 的六个地点和下田的三个地点的遗传结构进行了区域分析。根据当地种群的近亲繁殖系数进行区域尺度分析，下田的近亲繁殖比率高于北unezaki，这可能是暴露环境中垂直地带分布有限的结果。而在北常崎，由于在遮蔽环境中垂直分布较广，因此个体间的杂交很频繁。相比之下，根据种群间的成对亲缘关系系数（FST），从局部范围来看，下田当地种群间的基因流动范围很广，但在北常崎则很有限。在下田，即使近亲繁殖在当地十分活跃，当地种群之间的基因交流也可能支持元种群的维持和当地种群的快速恢复。然而，在北根崎，当地种群之间的遗传交流仅限于几百米范围内，由于近交抑郁，元种群结构将长期衰退。根据亲代-子代分析，研究了北根崎种群中动物孢子在当地的传播距离，结果显示，动物孢子主要在距离其亲代 5 米范围内定居。不过，在 4 × 30 米的研究区域内，一些动物孢子的传播距离超过了 27 米。本研究表明，在研究片叶海带的孢子传播时，在不同空间尺度上进行检查非常重要。

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Local versus regional patterns in zoospore dispersal of the kelp Eisenia bicyclis (Laminariales, Phaeophyceae)

SummaryIt is generally accepted that kelp populations have a metapopulation structure. Most zoospores settle near to their parent individual, and infrequent but long‐distance dispersal of zoospores contributes to gene flow between local populations. Population genetic analysis of single nucleotide polymorphism genotyping by MIG‐seq (i.e. multiplexed inter‐simple sequence repeats genotyping by sequencing) was performed on the dominant kelp, Eisenia bicyclis, in two areas: Kitsunezaki (a sheltered area) and Shimoda (an exposed site). Regional scale analysis of genetic structure was conducted at six sites in Kitsunezaki and three sites in Shimoda. When viewed on a regional scale based on the inbreeding coefficient within the local population, the inbreeding ratio was higher in Shimoda than in Kitsunezaki, probably as a result of the limited vertical zonal distribution in the exposed environment. Vertically wide distribution in the sheltered environment apparently enabled frequent crossing among individuals in Kitsunezaki. By contrast, when viewed on a local scale based on the pairwise kinship coefficient (FST) between populations, gene flow among local populations in Shimoda occurred over a wide area, but was limited in Kitsunezaki. In Shimoda, genetic exchange between local populations, even if inbreeding is locally active, is likely to support metapopulation maintenance and rapid recovery of local populations. In Kitsunezaki, however, genetic exchange among local populations is limited within few 100 m, and the metapopulation structure will decline in the long term because of inbreeding depression. Local dispersal distance of zoospores was investigated based on parent–offspring analysis in the Kitsunezaki population, which revealed that zoospores mainly settled within 5 m of their parent. However, some zoospores traveled over 27 m within the 4 × 30 m study area. The present study shows the importance of examination at different spatial scales when investigating zoospore dispersal of laminarialean kelps.

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来源期刊

Phycological Research 生物-海洋与淡水生物学

CiteScore

3.60

自引率

13.30%

发文量

审稿时长

>12 weeks

期刊介绍： Phycological Research is published by the Japanese Society of Phycology and complements the Japanese Journal of Phycology. The Journal publishes international, basic or applied, peer-reviewed research dealing with all aspects of phycology including ecology, taxonomy and phylogeny, evolution, genetics, molecular biology, biochemistry, cell biology, morphology, physiology, new techniques to facilitate the international exchange of results. All articles are peer-reviewed by at least two researchers expert in the filed of the submitted paper. Phycological Research has been credited by the International Association for Plant Taxonomy for the purpose of registration of new non-vascular plant names (including fossils).