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Noriko Azuma Assistant Professor |
Degree 【 display / non-display 】
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Environmental Earth Science ( 2004.03 Hokkaido University )
Employment Record in Research 【 display / non-display 】
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Tokyo University of Agriculture Faculty of Bio-Industry Department of Ocean and Fisheries Sciences Assistant Professor
2021.06
Research Interests 【 display / non-display 】
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molecular population genetics
Papers 【 display / non-display 】
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KATOGI Yuichi, MATSUMOTO Hiroyuki, TAKAHASHI Megumi, AZUMA Noriko, CHIBA Susumu
Japanese Journal of Benthology 77 ( 0 ) 27 - 37 2022.12
Language：Japanese Publisher：JAPANESE ASSOCIATION OF BENTHOLOGY
<p>The life history of <i>Palaemon paucidens</i>, a common freshwater shrimp inhabits many freshwater areas in Japan, remains unclear. In the present study, we surveyed a single population in a stream in Kesennuma, Miyagi Prefecture, Japan to elucidate the life history of this species. The spatio-temporal distribution pattern of the surveyed population was investigated in samples from seven stations established along the upstream and downstream sections of the stream. Size composition, state of sexual maturation, and appearance of hatched larvae were observed in samples collected from the mouth of the stream. Molecular species identification was used to confirm that the samples were <i>P. paucidens</i>. The results indicated that the total population consisted of three year-classes, and that many of the matured individuals (one or two years old) of both sexes seasonally migrated to the mouth of the stream. However, because some individuals remained in the freshwater area upstream, the migration of this species at our study site was partial. Larvae appeared at the same time as adults migrated downstream, and larvae hatched only at night. Based on age estimations in the field and the spawning intervals of females in a laboratory, it was peculated that two-year-old individuals would die after reproduction while one-year-olds would migrate upstream again. As the seasonal migration of both males and females corresponded to reproduction, we conclude that <i>P. paucidens</i> at our study site show diadromous migration and that their main migration pattern is catadromy.</p>
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Genetic differentiation in Palaemon septemtrionalis between populations of two rivers examined by newly developed short tandem repeat markers Reviewed International journal
Noriko Azuma, Masamichi Kuroda, Yuichi Katogi, Susumu Chiba
Crustacean Research 51 123 - 127 2022.11
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Carcinological Society of Japan
We developed short tandem repeat markers for Palaemon septemtrionalis and tested their utility for analysing population genetics. Six markers were selected for their genotyping ability and suitability for population genetic analyses, and the genetic differences between two populations from different rivers were evaluated using these markers. The results suggested a low level of genetic differentiation between the two populations.
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A simple method for identifying two species, Phoca largha and P. vitulina, based on mitochondrial DNA suggests their possible hybridization around Hokkaido, Japan Reviewed
Azuma Noriko, Kobayashi Nozomi, Kikkawa Yoshiaki, Kobayashi Mari
Coastal marine science 2020.09
Language：English Publishing type：Research paper (scientific journal)
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Geographic patterns in colonial reproductive strategy in Myrmecina nipponica : Links between biogeography and a key polymorphism in ants Reviewed
Adam L. Cronin, Noriko Azuma, Satoshi Miyazaki, Emiko Oguri, Michael P. Schwarz, Fuminori Ito
Journal of Evolutionary Biology 2020.07
Language：English Publishing type：Research paper (scientific journal)
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Adam L. Cronin, Noriko Azuma, Satoshi Miyazaki, Emiko Oguri, Michael P. Schwarz, Fuminori Ito
Journal of Evolutionary Biology 33 ( 9 ) 1192 - 1202 2020.07
Publisher：Oxford University Press (OUP)
<jats:title>Abstract</jats:title><jats:p>The ability to express different phenotypes can help define species distributions by allowing access to, and exploitation of, new environments. Social insects employ two markedly different reproductive strategies with contrasting cost/benefit characteristics: independent colony foundation (ICF), which is associated with high dispersal range and high risk, and dependent colony foundation (DCF), characterized by low risk but low dispersal. The ant <jats:italic>Myrmecina nipponica</jats:italic> employs both of these strategies, with the frequency of each apparently varying between populations. We combine molecular data with data on reproductive strategy from different populations of this species throughout Japan to explore how this polymorphism is linked to environmental factors and whether this relationship can help explain the current and historical biogeography of this species. Reproductive strategy exhibited a strong geographic pattern, with ICF predominant in southern populations and DCF more common in northern and southern highland populations. Molecular analyses clearly divided populations into broad geographic regions, with the southern lowland populations basal to (southern highland (+ northern)) populations. Intra‐population polymorphism in colony‐founding strategy was widespread, and polymorphism was reconstructed as the likely ancestral state. The frequency of different strategies was linked with climate, with DCF more common in colder areas. A recent inferred origin to the northern lineage suggests that colonization of northern Japan was a rapid event coincident with warming at the end of the Last Glacial Maxima, likely facilitated by the cold‐adaptive advantages of DCF. We discuss how such polymorphisms could help explain the biogeography of this and other social insects.</jats:p>
DOI： 10.1111/jeb.13659