Ground crickets singing in volcanic warm “islets” in snowy winter: Their seasonal life cycles, photoperiodic responses and origin
Ground crickets singing in volcanic warm “islets” in snowy winter: Their seasonal life cycles, photoperiodic responses and origin
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白雪皑皑的冬季，地蟋蟀在火山温暖的“小岛”中歌唱：它们的季节性生命周期、光周期反应和起源
DOI：
10.1111/ens.12199
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发表时间：
2016
影响因子：
0.9
通讯作者：
M. Takeda
中科院分区：
文献类型：
--
作者：
Sinzo Masaki;M. Soma;H. Ubukata;H. Katakura;R. Ichihashi;Zhu;N. Ichijô;N. Kobayashi;M. Takeda
地蟋蟀Dianemobius nigroFasciatus在日本以卵的形式越冬，在北海道和本州北部为一化性，在更南边的地方为二化性。然而，在北海道，这种蟋蟀在冬天在几片覆盖着苔藓和草的沼泽田野中歌唱，在当地被称为“Bokke”。在这种温暖的小岛上，成虫密度在初夏和秋季都很高，这表明与北海道Bokke栖息地以外的单一生活史相反，蟋蟀是两栖动物。从Bokke栖息地定期收集的雌性产卵显示出明显的滞育发生的季节性周期。在26℃时，Bokke品系在长日照下产生非滞育卵，在短日照下产生滞育卵，与南方双生种群一样，但临界日长比南方长。几个来自北海道和本州北部非Bokke栖息地的菌株在长日数和短日数下产生高比例的滞育卵，这与一化性生活史的预期相同。在Bokke栖息地鸣叫的冬季成虫可能是秋季世代的幸存者，也可能是秋季产卵并在高温下成熟的个体。在实验室中，短日龄卵滞育的比例仅通过几代的选择而降低。根据线粒体COI基因的核苷酸序列和4个等位酶基因座构建的Bokke种群和非Bokke种群的系统发育树表明，Bokke种群和非Bokke种群在进化上很长一段时间都没有被分离出来。
The ground cricket Dianemobius nigrofasciatus overwinters as an egg in Japan, being univoltine in Hokkaido and northern Honshu and bivoltine farther south. In Hokkaido, however, this cricket is heard singing in winter in several fumarolic fields covered with moss and grasses locally known as “bokke”. In such warm “islets” the adult density was high in early summer and again in autumn, indicating that the cricket is bivoltine in contrast to the univoltine life cycle outside the bokke habitats in Hokkaido. Eggs laid by females collected at regular intervals from a bokke habitat showed a clear seasonal cycle of diapause incidence. At 26°C, the bokke strains produced non‐diapause eggs under long days and diapause eggs under short days as in the southern bivoltine populations, although the critical day‐length was longer than in the south. Several strains derived from non‐bokke habitats in Hokkaido and northern Honshu produced high percentages of diapause eggs under long days as well as short days as expected for the univoltine life cycle. Winter adults singing in bokke habitats could be either survivors of the autumn generation or individuals derived from eggs laid in autumn and then matured in response to the high soil temperature. In the laboratory, the proportion of egg diapause in short days was decreased by selection only for several generations. Phylogenetic trees of bokke and non‐bokke populations, based on both the nucleotide sequence of the mitochondrial COI gene and four allozyme loci, suggest that bokke populations have not been isolated from non‐bokke populations for an evolutionarily significant time.
影响因子：
10.7
作者：
Takezaki, Naoko;Nei, Masatoshi;Tamura, Koichiro
通讯作者：
Tamura, Koichiro