Polar bear vs

Ursus maritimus compared with Rhizobium multihospitium

Key Differences

• Polar bear is Vulnerable while is Not Evaluated.

Taxonomic Classification

Rank	Polar bear
Kingdom	Animalia (动物界)	Bacteria (Bacteria)
Phylum	Chordata (脊索动物门)	Proteobacteria (變形菌門)
Class	Mammalia (哺乳動物)	Alphaproteobacteria (α-变形菌纲)
Order	Carnivora (食肉目)	Rhizobiales (根瘤菌目)
Family	Ursidae (Bears)	Rhizobiaceae
Genus	Ursus (Bears)	Rhizobium
Species	Ursus maritimus	Rhizobium multihospitium

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

NE — Not Evaluated

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

Native to Asia, inhabiting ecosystems characteristic of the region.

Range

Found in Taiwan.

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。

多宿主根瘤菌（Rhizobium multihospitium）是根瘤菌科的固氮α-变形菌，宿主范围异常广泛，能够与多种豆科植物形成根瘤。其名称反映了与众多宿主植物形成共生关系的能力。从中国根瘤中分离，有助于多样化农业和自然豆科生态系统的生物固氮。