Polar bear vs

Ursus maritimus compared with Xenasma pulverulentum

Taxonomic Classification

Rank	Polar bear
Kingdom	Animalia (動物)	Fungi (菌界)
Phylum	Chordata (脊索動物)	Basidiomycota (担子菌門)
Class	Mammalia (哺乳類)	Agaricomycetes (真正担子菌綱)
Order	Carnivora (ネコ目)	Russulales (ベニタケ目)
Family	Ursidae (Bears)	Xenasmataceae
Genus	Ursus (Bears)	Xenasma
Species	Ursus maritimus	Xenasma pulverulentum

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

VU — Vulnerable

Physical Characteristics

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

Habitat & Geographic 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.

Habitat

Typically found in forest floors, decomposing wood, and soil ecosystems.

Range

Found across Europe (5 countries) and South America (Brazil). Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

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。

Xenasma pulverulentumは枯れた針葉樹の木材に粉末状の薄灰色から白色の伏生状地殻を形成する皮膜菌類です。北欧とスカンジナビア全域の北方および温帯針葉樹林に生息します。この腐生菌類は枯れた針葉樹の木材を分解し、森林生態系の栄養素の再循環に貢献します。