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Spatial distributions of euphausiid species in the Northern Lützow-Holm Bay, East Antarctica during the austral summer in 2005 and 2006
https://nipr.repo.nii.ac.jp/records/14137
https://nipr.repo.nii.ac.jp/records/1413721358c74-4edc-43a0-84da-d6974400d386
Item type | 学術雑誌論文 / Journal Article(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2017-06-05 | |||||
タイトル | ||||||
タイトル | Spatial distributions of euphausiid species in the Northern Lützow-Holm Bay, East Antarctica during the austral summer in 2005 and 2006 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Spatial distributions of euphausiid species in the Northern Lützow-Holm Bay, East Antarctica during the austral summer in 2005 and 2006 | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Euphausiid community | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Spatial distribution | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Population structure | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Lützow-Holm Bay | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Southern ocean | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Ono, Atsushi
× Ono, Atsushi× Moteki, Masato |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Understanding the ecology of euphausiids, especially Euphausia superba, is essential for understanding the Southern Ocean ecosystem. To determine the distribution and community structure of euphausiids in north Lützow-Holm Bay, we used stratified and quantitative sampling from the surface to a depth of 2000 m with an RMT 8 net in January of 2005 and 2006. Euphausiid abundance ranged from 1.2 to 32.2 ind. m−2, with Thysanoessa macrura and E. superba being dominant, whereas E. triacantha and E. crystallorophias were very scarce. T. macrura was abundant in cold epipelagic waters as well as in the warmer Modified Circumpolar Deep Water (MCDW). E. crystallorophias was also observed in both the cold waters and the MCDW. The juveniles, adult males, and gravid and spent females (IIIC–E) of E. superba were observed in the warm MCDW, which supports the possibility of deep water spawning, as suggested by previous studies. The E. superba population in 2005 was composed of large, mature individuals, whereas small, immature specimens were dominant in 2006. A higher chlorophyll a concentration in 2005, resulting from earlier sea ice retreat, may have advanced the maturity of E. superba. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | オキアミ類、特にEuphausia superbaの生態を明らかにすることは、南大洋生態系を解明するためには必要不可欠である。そこで、リュツォ・ホルム湾北部域におけるオキアミ類の分布と群集構造を明らかにするため、2005年および2006年の1月にRMTネットを用いた0–2,000 mの層別定量採集を行った。オキアミ類現存量は1.2–32.2 ind. m-2であり、Thysanoessa macruraとE. superbaが優占する一方で、E. triacanthaとE. crystallorophiasは非常に少なかった。T. macruraは暖かいModified Circumpolar Deep Water (MCDW) と冷たい表層で卓越した。E. crystallorophiasも冷たい水塊と暖かいMCDWに出現した。E. superbaでは、juvenile, adult male, gravid and spent female (IIIC–E) が暖かいMCDWに出現しており、深層における本種の産卵が示唆された。2005年におけるE. superba個体群では、大型の成熟個体が優占するのに対し、2006年では小型の未成熟個体が卓越した。2005年においては、早期海氷融解によりChl aが高く、このことがE. superbaの成熟を促進させたと考えられる。 | |||||
書誌情報 |
en : Polar Science 巻 12, p. 59-68, 発行日 2017-06 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 18739652 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1016/j.polar.2016.10.003 | |||||
関連名称 | 10.1016/j.polar.2016.10.003 |