北極の藻類の毒素の増加と海の温暖化との関係を弓頭クジラの糞が示している

Kathi A Lefebvre¹, Patrick Charapata², Raphaela Stimmelmayr³

¹Environmental and Fisheries Sciences, Northwest Fisheries Science Center, NOAA Fisheries, Seattle, WA, USA. Kathi.Lefebvre@noaa.gov.

Nature

|July 9, 2025

まとめ

北極の食物網に有害な藻類の毒素が増えています野生動物やアラスカの先住民の食料安全保障に危険を及ぼす毒素濃度が上昇しています

科学分野:

海洋生物学
生態毒理学
気候変動科学

背景:

太平洋の北極の海洋生態系は海洋温暖化と海氷の減少により急速に変化しています
有害な藻類の繁殖が増加し,野生生物と人間の健康に危険をもたらすと予測されています.
北極の食物網に藻類毒素の存在に関する長期的なデータは不足しています.

研究の目的:

藻類毒素の存在を数値化するために 20年以上にわたって北極の食物網で
環境の変化と藻類毒素暴露の関係を評価する.
北極の野生生物と食料安全保障に及ぼす影響を評価する

主な方法:

藻類の毒素は 19年に渡って採取された 205頭のクジラから採取した腸のサンプルで定量化されました
ボウヘッドクジラが食物網のサンプルを集めたのです
毒素レベルは海洋学と大気学データと相関していた.

主要な成果:

ボウヘッドクジラにおける藻類毒素の流行と濃度は,海洋の熱流,開いた水域,風速,大気圧と有意に相関しています.
北極の食物網で藻類の毒素濃度が上昇していることが確認されました
海洋温暖化と藻類毒素暴露のリスクの増加との間にメカニズム的な関連が確立された.

結論:

北極の食物網の藻類毒素濃度が明らかに増加しています
これは北極の野生生物と先住民の食糧安全保障に大きな脅威をもたらします
長期的なモニタリングとさらなる研究は,これらのリスクを理解し,軽減するために不可欠です.

さらに関連する動画

09:47

A Standardized Procedure for Monitoring Harmful Algal Blooms in Chile by Metabarcoding Analysis

Published on: August 26, 2021

5.4K

09:06

Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside

Published on: July 3, 2016

8.2K

関連する概念動画

01:19

Other Algae

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...

01:50

Global Climate Change

24.8K

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.

24.8K

01:21

Green Algae

219

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...

219

01:50

Threats to Biodiversity

22.9K

There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...