Identification of hemi-clonal reproduction in three species of Hexagrammos marine reef fishes.
Identification of hemi-clonal reproduction in three species of Hexagrammos marine reef fishes.
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三种六眼礁鱼半克隆繁殖的鉴定。
DOI：
10.1111/jfb.12414
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
H
中科院分区：
文献类型：
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作者：
Kimura;M.;Horita;M.;Abe;S.;Arai;K.;Kawata;M. & Munehara;H
在日本北海道南部，经常观察到北方种八角角鼠与温带两种八角角鼠和八角角鼠的自然杂交。之前的研究表明。八爪鼠是这两个杂种的母系祖先；杂交种都是有生育能力的雌性，它们经常与父系物种交配。尽管发生了如此猖獗的杂交，但在杂交区仍保持着物种边界。尽管有频繁的回交，但没有基因渗入的可能解释可能包括无性繁殖：孤雌生殖、雌性生殖和杂交种。自然杂交产生的单倍体卵只含有h。通过与h的单倍体精子受精，产生F1 -杂交型后代。agrammusorH。otakii(父亲的祖先)。这种繁殖方式是在自然杂交种与父系祖先的一个雄性的人工回交杂交中发现的。这些结果表明，天然杂交种采用杂交发生的可能性很大，并通过与父本祖先回交的杂交发生产生后代。这些杂交种代表了从广泛栖息在北太平洋的海洋鱼类中发现的第一个杂交种遗传系统。与其他杂交遗传系统相比，这些ehmohy杂种在杂交带与所有三个祖先物种共存。并对共存机理进行了讨论。
Natural hybrids between the boreal speciesHexagrammos octogrammusand two temperate speciesHexagrammos agrammusandHexagrammos otakiiwere observed frequently in southern Hokkaido, Japan. Previous studies revealed thatH. octogrammusis a maternal ancestor of both hybrids; the hybrids are all fertile females and they frequently breed with paternal species. Although such rampant hybridization occurs, species boundaries have been maintained in the hybrid zone. Possible explanations for the absence of introgressions, despite the frequent backcrossing, might include clonal reproduction: parthenogenesis, gynogenesis and hybridogenesis. The natural hybrids produced haploid eggs that contained only theH. octogrammusgenome (maternal ancestor) with discarded paternal genome and generated F1‐hybrid type offspring by fertilization with the haploid sperm ofH. agrammusorH. otakii(paternal ancestor). This reproductive mode was found in an artificial backcross hybrid between the natural hybrid and a male of the paternal ancestor. These findings indicate that the natural hybrids adopt hybridogenesis with high possibility and produce successive generations through hybridogenesis by backcrossing with the paternal ancestor. These hybrids ofHexagrammosrepresent the first hybridogenetic system found from marine fishes that widely inhabit the North Pacific Ocean. In contrast with other hybridogenetic systems, theseHexagrammoshybrids coexist with all three ancestral species in the hybrid zone. The coexistence mechanism is also discussed.