vs Polar bear

Nitrosopelagicus brevis compared with Ursus maritimus

Key Differences

is Not Evaluated while Polar bear is Vulnerable.

Taxonomic Classification

Rank		Polar bear
Kingdom	Archaea (Archaea)	Animalia (Animals)
Phylum	Thermoproteota (Thermoproteota)	Chordata (Chordates)
Class	Nitrososphaeria (Nitrososphaeria)	Mammalia (Mammals)
Order	Nitrososphaerales (Nitrososphaerales)	Carnivora (Carnivorans)
Family	Nitrosopumilaceae	Ursidae (Bears)
Genus	Nitrosopelagicus	Ursus (Bears)
Species	Nitrosopelagicus brevis	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.

Nitrosopelagicus brevis is a small, aerobic ammonia-oxidizing thaumarchaeon belonging to the abundant marine archaeal group Nitrososphaeria. It inhabits the open ocean, particularly the nutrient-poor photic zone of tropical and subtropical oceanic gyres. This chemolithoautotrophic organism oxidizes ammonia to nitrite and plays a fundamental role in marine nitrogen cycling.

Polar bear

The largest land carnivore on Earth, polar bears can exceed 700 kg and are found across Arctic sea ice from Canada to Russia. Highly specialized marine mammals that rely on sea ice to hunt ringed and bearded seals. Excellent swimmers capable of covering vast distances in open water. Listed as Vulnerable, with populations under severe pressure from rapid Arctic sea ice loss due to climate change.