A Unique Conjunction: Evidence for Gynogenesis Accompanying Haplodiploid Sex Determination in the Australian Ant Myrmecia impaternata Taylor

IF 1.6 Q2 ENTOMOLOGY Psyche: A Journal of Entomology Pub Date : 2018-12-18 DOI:10.1155/2018/2832690
Robert W. Taylor, H. Imai, E. Hasegawa, C. Beaton
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引用次数: 1

Abstract

Myrmecia impaternata is an allodiploid all-female species of hybrid origin. Its parental taxa are confirmed here to be M. banksi and M. pilosula. We suggest that its queens produce diploid female offspring by gynogenetic parthenogenesis, a process which requires interaction between unreduced maternal oocytes and allospecific sperm cells obtained by copulation with another related species. We propose that impaternata queens almost certainly mate for this purpose with males reared in impaternata nests from eggs laid by impaternata females. Because sex in ants is determined by haplodiploidy (males haploid, females diploid), we posit that these males would in fact not be technically conspecific with the females in whose reproductive systems they developed, since they would each carry the haploid genome of one or other of the hybridic parental species. They would therefore be individually identical karyologically to males of either M. banksi or M. pilosula and appropriately allospecific to M. impaternata. We postulate that, unlike all other known gynogens, M. impaternata would have no need to maintain parasitic affiliation or sympatry with free-living sperm-donor host species. Its queens are arguably able to produce the required allospecific males by accessing their own genomes. M. impaternata apparently originated by instantaneous speciation when individuals of its parental species first successfully hybridized.
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一种独特的结合:澳大利亚金蚁(Myrmecia impaternata Taylor)雌核发生伴随单倍体性别决定的证据
黑杨梅是一个异二倍体的全雌性杂交种。其亲本分类群在这里被确认为M.banksi和M.pilosula。我们认为,它的女王通过雌生殖单性生殖产生二倍体雌性后代,这一过程需要未还原的母体卵母细胞和通过与另一个相关物种交配获得的异特异性精子细胞之间的相互作用。我们建议,为了这个目的,几乎可以肯定的是,凤蝶女王会与在凤蝶巢穴中由雌性凤蝶产下的蛋饲养的雄性进行交配。由于蚂蚁的性别是由单倍性决定的(雄性单倍体,雌性二倍体),我们假设这些雄性实际上在技术上不会与它们在其生殖系统中发育的雌性同种,因为它们各自携带一个或另一个杂交亲本物种的单倍体基因组。因此,它们在核体上与班克西M.banksi或毛果M.pilosula的雄性个体完全相同,并且与国际大蠊具有适当的异特异性。我们假设,与所有其他已知的雌核细胞生成菌不同,M.imparanta不需要与自由生活的精子供体宿主物种保持寄生关系或症状。它的女王可以说能够通过访问自己的基因组来产生所需的异特异性雄性。当其亲本物种的个体首次成功杂交时,M.impalternata显然是由瞬时物种形成引起的。
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来源期刊
CiteScore
1.80
自引率
0.00%
发文量
8
审稿时长
15 weeks
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