Horizontal and vertical distribution and demography of euphausiids in the Ross Sea and its adjacent waters in 2004/2005

The horizontal and vertical distribution and population structure of euphausiids in the Ross Sea and its adjacent waters were investigated during the summers of 2004/2005 using stratified towed samples. Nine species of euphausiids occurred in the survey area. Among them, Euphausia triacantha was dom...

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Veröffentlicht in:Polar biology 2008-10, Vol.31 (11), p.1343-1356
Hauptverfasser: Taki, Kenji, Yabuki, Takashi, Noiri, Yoshifumi, Hayashi, Tomonari, Naganobu, Mikio
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container_end_page 1356
container_issue 11
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container_title Polar biology
container_volume 31
creator Taki, Kenji
Yabuki, Takashi
Noiri, Yoshifumi
Hayashi, Tomonari
Naganobu, Mikio
description The horizontal and vertical distribution and population structure of euphausiids in the Ross Sea and its adjacent waters were investigated during the summers of 2004/2005 using stratified towed samples. Nine species of euphausiids occurred in the survey area. Among them, Euphausia triacantha was dominant in biomass north of the southern boundary of the Antarctic circumpolar current (SB). Thysanoessa spp. was widely distributed north of the continental slope, while E. superba was distributed from the SB to the slope, where it showed the highest biomass. Juvenile E. superba was distributed offshore near the SB and remained at the surface, but gravid females were dominant in the slope and mainly occurred in the middle layers (400–600 m). Adult and juvenile E. crystallorophias were found at 200–300 m in the colder water of the continental shelf. In general, the peak biomass of euphausiids was found in the mid layers of the Ross Sea area. The life span and the number of spawns for major species are also discussed.
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subjects Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Biomass
Biomedical and Life Sciences
Continental shelves
Continental slope
Crustacea
Crustaceans
Demography
Ecology
Fundamental and applied biological sciences. Psychology
Invertebrates
Life Sciences
Marine biology
Microbiology
Oceanography
Oceans
Original Paper
Particular ecosystems
Plant Sciences
Population structure
Studies
Synecology
Vertical distribution
Zoology
title Horizontal and vertical distribution and demography of euphausiids in the Ross Sea and its adjacent waters in 2004/2005
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