Polar bear vs

Ursus maritimus compared with Ustilago filiformis

Key Differences

• Polar bear is Vulnerable while is Not Evaluated.

Taxonomic Classification

Rank	Polar bear
Kingdom	Animalia (动物界)	Fungi (真菌界)
Phylum	Chordata (脊索动物门)	Basidiomycota (担子菌门)
Class	Mammalia (哺乳動物)	Ustilaginomycetes (黑粉菌纲)
Order	Carnivora (食肉目)	Ustilaginales (黑粉菌目)
Family	Ursidae (Bears)	Ustilaginaceae
Genus	Ursus (Bears)	Ustilago
Species	Ursus maritimus	Ustilago filiformis

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 Europe and North America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Belgium, Denmark, Sweden, and United States.

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。

Ustilago filiformis是Ustilaginaceae科的黑粉菌，是侵染水甜茅(Glyceria属)并将其花部转化为暗色冬孢子团的专性寄生菌。通过操控宿主植物发育在正常子房位置形成瘿瘤，从而散播真菌孢子。Ustilago属的黑粉病感染可显著降低宿主禾本科植物的种子产量。