vs Polar bear

Nitrosarchaeum limnae compared with Ursus maritimus

Key Differences

• is Not Evaluated while Polar bear is Vulnerable.

Taxonomic Classification

Rank		Polar bear
Kingdom	Archaea (Archaea)	Animalia (动物界)
Phylum	Thermoproteota (热变形菌门)	Chordata (脊索动物门)
Class	Nitrososphaeria (Nitrososphaeria)	Mammalia (哺乳動物)
Order	Nitrososphaerales (Nitrososphaerales)	Carnivora (食肉目)
Family	Nitrosopumilaceae	Ursidae (Bears)
Genus	Nitrosarchaeum	Ursus (Bears)
Species	Nitrosarchaeum limnae	Ursus maritimus

Conservation Status

NE — Not Evaluated

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

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.

Nitrosarchaeum limnae是泉古菌门的一种淡水氨氧化古菌，从康斯坦茨湖沉积物中分离。它是化学无机自养生物，通过将氨氧化为亚硝酸盐获取能量，对淡水生态系统的氮循环有重大贡献。这一发现表明泉古菌氨氧化体并不局限于海洋环境。

Polar bear

北极熊是地球上最大的陆地食肉动物，体重可超过700千克，分布于从加拿大到俄罗斯的北极海冰区。是高度特化的海洋哺乳动物，依赖海冰捕猎环斑海豹和髯海豹。是优秀的游泳者，能够横渡广阔的开阔水域。被列为易危种，因气候变化导致北极海冰迅速减少，种群正受到严重威胁。