The Natural Environmental Science Research
Online ISSN : 1883-1982
Print ISSN : 0916-7595
Search
Advanced search
OR
Browse
Search
Current issue
Displaying 1-4 of 4 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Egg deposition substrate of Japanese medaka Oryzias latipes in a rice paddy.
    Sara Fukuda, Ayami Kodera, Kazuki Miyabe, Momoka Haji, Tadao Kitagawa, ...
    2024 Volume 37 Pages 1-7
    Published: December 25, 2024
    Released on J-STAGE: December 25, 2024
    DOIhttps://doi.org/10.32280/nesr.37.0_1
    JOURNAL OPEN ACCESS
    Show abstractHide abstract
    Although wild Japanese medaka Oryzias latipes is known to reproduce in rice paddies, reproductive ecology of medaka in rice paddies has not been studied. It is known that the female medaka deposits fertilized eggs on appropriate substrates, such as aquatic plants, after the spawning behavior by a pair of male and female. In the present study, we observed which plant species were used as egg deposition substrates in a rice paddy on a university campus, where medaka reproduce naturally. Eggs of medaka were observed on Chara braunii, Trapa jeholensis, and Spirogyra sp., but not on rice Oryza sativa or Monochoria vaginalis. The study revealed that medaka did not utilize O. sativa, but utilized mainly aquatic plants, so-called weeds, as egg deposition substrates in the rice paddy. Spraying herbicide may be not only directly toxic to medaka but also indirectly threatening their reproduction due to deprivation of egg deposition substrate.
    View full abstract
    Download PDF (2218K)
  • Food caching and retrieving behaviors by a red fox and site visitations by raccoon dogs.
    Hiroshi Tsunoda, Hiroto Enari, Haruka Enari S.
    2024 Volume 37 Pages 9-14
    Published: December 25, 2024
    Released on J-STAGE: December 25, 2024
    DOIhttps://doi.org/10.32280/nesr.37.0_9
    JOURNAL OPEN ACCESS
    Show abstractHide abstract
    Food caching and retrieving behavior by a red fox Vulpes vulpes was observed in a coniferous forest in Minami-Aizu, southern Fukushima, Japan, using a camera trap. The red fox hoarded food at the base of a tree on Oct. 30, 2022, 5:29 AM, and retrieved it on the same day, 6:49 PM (approximately 13.3 hours of hoarding). A raccoon dog Nyctereutes procyonoides visited the same site nine minutes after the fox left, and consumed leftovers remaining there. No interference was observed between the two canids. Although it was difficult to identify the nature of the food, it looked like some plant material (e.g., vegetable) or human food waste. Over the next two consecutive days, a fox and two raccoon dogs visited the site.
    View full abstract
    Download PDF (5291K)
  • Rhachithecium perpusillum (Thwaites & Mitt.) Broth. (Rhachitheciaceae) newly found in Kyoto Prefecture, Japan.
    Ryouhei Kobayashi, Hiroyuki Akiyama
    2024 Volume 37 Pages 15-17
    Published: December 25, 2024
    Released on J-STAGE: December 25, 2024
    DOIhttps://doi.org/10.32280/nesr.37.0_15
    JOURNAL OPEN ACCESS
    Show abstractHide abstract
    Rhachithecium perpusillum (Thwaites & Mitt.) Broth. is added to the moss flora of Kyoto Prefecture, Japan. Its closest relative, R. nipponicum (Toyama) Wijk & Margad., was known to lack peristome teeth and found in more detailed observations to have no traces of their formation. Then, the two species can be distinguished on the basis of the immature sporophyte. Rhachitechium perpusillum was previously known to occur in only two locations in Japan. Despite this rarity, colonies speculated to be of this species were found in four urban green spaces in Kyoto City. Interestingly, the sporophytes were only found in one of the locations, and in that colony no sporophytes were seen until three years later. These observations indicate the difficulty of discovering and identifying this species and the possibility of this species being more widely distributed within Japan.
    View full abstract
    Download PDF (1355K)
  • Specimen-based record of Hemigrapsus takanoi Asakura & Watanabe, 2005 from the Sagami River, central Japan.
    Toshishige Itoh
    2024 Volume 37 Pages 19-24
    Published: December 25, 2024
    Released on J-STAGE: December 25, 2024
    DOIhttps://doi.org/10.32280/nesr.37.0_19
    JOURNAL OPEN ACCESS
    Show abstractHide abstract
    In June 2024, five subadult male Hemigrapsus takanoi Asakura & Watanabe, 2005 were collected from the Sagami River estuary, Kanagawa Prefecture, located on the eastern side of the middle Honshu Island, Japan. The species has been known from subtropical to subarctic regions along the Pacific coast of East Asia (from East China to Far East Russia) and along the Northern European coast (from Northern Spain to Northern Germany). This is the first specimen-based record for the species from the Sagami River.
    View full abstract
    Download PDF (1912K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top