vs Polar bear

Dictyota dichotoma compared with Ursus maritimus

Taxonomic Classification

Rank		Polar bear
Kingdom	Chromista (クロミスタ)	Animalia (動物)
Phylum	Ochrophyta (オクロ植物)	Chordata (脊索動物)
Class	Phaeophyceae (褐藻)	Mammalia (哺乳類)
Order	Dictyotales (Dictyotales)	Carnivora (ネコ目)
Family	Dictyotaceae	Ursidae (Bears)
Genus	Dictyota	Ursus (Bears)
Species	Dictyota dichotoma	Ursus maritimus

Conservation Status

VU — Vulnerable

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute		Polar bear
Diet	—	Carnivore
Average Lifespan	—	25 years
Average Length	—	2.4 m
Average Weight	—	450.0 kg

Habitat & Geographic Range

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, temperate grasslands and steppes, and flooded grasslands and savannas, among 4 distinct biome types within the Neotropic biogeographic realm.

Range

Widely distributed across Asia (Taiwan), Europe (4 countries), and South America (Argentina, Brazil). Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Polar bear

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Dictyota dichotomは、繰り返し二叉分岐する平らなオリーブ緑色から黄褐色の葉状体が広い扇形を形成する一般的な褐藻類である。世界の温帯から熱帯の海の潮間帯や浅い潮下帯の岩礁に生息する。この光合成大型藻類は付着根を介して岩に固着し、有性生殖と無性生殖の両方が可能である。

Polar bear

地球上で最大の陸上肉食動物であるホッキョクグマは700kgを超えることがあり、カナダからロシアまでの北極海氷域全体に分布する。ワモンアザラシとヒゲアザラシを狩るために海氷に依存する高度に特化した海洋哺乳類である。広大な距離を泳ぐことができる優れた泳者でもある。脆弱種に指定されており、気候変動による急激な北極海氷の消失で個体群が深刻な圧力を受けている。