関連する実験動画
Updated: Sep 9, 2025

08:58
Colonization of Euprymna scolopes Squid by Vibrio fischeri
Published on: March 1, 2012
20.1K
ハワイ島の雪藻の植民史
Takahiro Segawa1, Nozomu Takeuchi2, Ryo Matsuzaki3
1Center for Life Science Research, University of Yamanashi, 1110, Shimokato, Chuo, Yamanashi, Japan.
The ISME journal
|September 5, 2025
まとめ
赤色雪藻は2023年の雪のイベントで,ハワイの孤立したマウナケアで発見されました. 遺伝分析により 過去の氷河期と 気候変動によって形成された 宇宙と古代の固有の系統が 明らかになりました
科学分野:
- 微生物生態学
- 氷河学
- 進化生物学
背景:
- 赤い色素の雪藻は 凍り付いた微生物で 世界中で見られます
- 孤立した環境や冷凍圏に広がるメカニズムは よく理解されていません
- ハワイのマウナキアは 地球上で最も孤立した冷凍圏のひとつです
研究 の 目的:
- ハワイの冷凍圏で 雪藻の存在と遺伝的多様性を調査する
- このユニークな場所での 雪藻の拡散パターンと 進化の歴史を理解するために
- 氷河期を含む過去の気候条件が,雪藻群の形成に果たした役割を調査する.
主な方法:
- 2023年にマウナケアで長期にわたって雪が留まった際の雪の採取
- 赤い色素の藻細胞の顕微鏡観察
- DNA抽出とITS2アンプリコンの配列化により,藻類群を特定する.
主要な成果:
- クロロフィタ属の赤い色素の雪藻がMaunakeaの雪サンプルで確認された.
- コスモポリティックなサングイナ群と 固有のクロロモナディナ群の2つの主要な群が検出されました.
- マウナケアの氷河期 (MIS 6) と一致する253~13万年前のハワイの最大のクラードを示唆している.
結論:
- コスモポリタン・スノー藻は 現在の気候条件下で 孤立した冷凍圏に散らばることができます
- 過去の氷河期は長期の生息地を提供し 固有の雪藻の系統の確立を可能にしました
- 雪藻の拡散と進化は,氷河期と長期的な気候変動によって大きく影響を受けます.
関連する概念動画
Green Algae
196
Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
196
Overview of Algae
176
The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
176
Red Algae
128
Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
128
Other Algae
86
The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
86
The Colonization of Land
35.5K
Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
35.5K
Diversity of Protists III
122
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
122

