南極東沖の海洋循環は,生態系構造と海氷の広がりに影響を及ぼします
S Nicol1, T Pauly, N L Bindoff
1Department of the Environment and Heritage, Channel Highway, Kingston, Tasmania, Australia. stephe_nic@antdiv.gov.au
Nature
|August 22, 2000
まとめ
南極の海洋生態系は,海氷と海流によって構成されています. この研究では,海氷の最大範囲は,以前からの仮定に反して,植物プランクトンと南極クリルを含む高い生物学的生産性と相関することが判明しました.
科学分野:
- 海洋生態学 海洋生態学とは
- 海洋学 海洋学 海洋学
- 南極研究南極研究
背景:
- 海氷と海洋の境界線は,南極海の海洋生態系に大きな影響を与える.
- 以前の研究では,南極環極流の南極境界が生物生産性のホットスポットであることを確認しました.
- メソスケール調査は,南極のクリルとサルプの豊富さを,海氷の範囲の変動と関連付けました.
研究 の 目的:
- 東南極の海岸線の3,500kmに沿った生態系構造と海洋学を調査する.
- 地元の調査スケールを,海氷と生物の生産性の世界的な観測と結びつける.
- 海氷と海洋循環が海洋生物に及ぼす地域的な影響を調査する.
主な方法:
- 衛星画像と過去のデータの分析.
- メソスケールの生態調査.
- 東南極の海岸線 (80°150°E) 沿いの海洋学データ収集.
主要な成果:
- 研究地域全体で年間海氷面積の3倍の変動が観察されました.
- 植物プランクトン,一次生産性,南極クリル,クジラ,海鳥は,冬の最大海氷の範囲の地域に集中しています.
- サルプは海氷の範囲が最小限にある地域で見つかりました.
- 強化された生物学的活動は,南極環極流の南極境界の南に観察されましたが,それと直接に関連していません.
結論:
- 南極東海岸沿いの海洋循環は,海氷の条件を決定する.
- 海洋循環はまた,すべてのトロフィックレベルにおける生物学的生産性のレベルを決定します.
- 海氷の広がりは,この地域における海洋生物の分布に影響を与える重要な要因です.
関連する概念動画
What is an Ecosystem?
Overview
What is Climate?
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
Global Climate Change
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
Keystone Species
Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a pivotal role in the...
Marine Microbial Ecology
Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...
Deep Sea Microbial Ecology
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...


