vs Polar bear

Chrysochromulina fragilis compared with Ursus maritimus

Key Differences

is Not Evaluated while Polar bear is Vulnerable.

Taxonomic Classification

Rank		Polar bear
Kingdom	Chromista (クロミスタ)	Animalia (動物)
Phylum	Haptophyta (ハプト藻)	Chordata (脊索動物)
Class	Prymnesiophyceae (Prymnesiophyceae)	Mammalia (哺乳類)
Order	Prymnesiales (Prymnesiales)	Carnivora (ネコ目)
Family	Chrysochromulinaceae	Ursidae (Bears)
Genus	Chrysochromulina	Ursus (Bears)
Species	Chrysochromulina fragilis	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

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Norway and Sweden.

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.

Chrysochromulina fragilis is a unicellular haptophyte microalga in the genus Chrysochromulina, family Chrysochromulinaceae, class Prymnesiophyceae. The specific epithet fragilis — meaning fragile — may reference the delicate nature of the cell's scale ornamentation or the structural fragility of the haptonema, which can be easily damaged during preparation of electron microscopy specimens. Chrysochromulina species are nanoplankton organisms characterized by golden-brown chloroplasts, two flagella of approximately equal length, and a coiling haptonema that is a defining feature of the haptophyte lineage. C. fragilis is known from Norwegian and Swedish coastal marine environments, reflecting the thorough phycological sampling of Scandinavian waters that produced a substantial proportion of the currently recognized Chrysochromulina species. In these cold temperate to subarctic coastal systems, haptophytes including C. fragilis contribute to the spring and summer phytoplankton biomass. The species engages in photosynthesis utilizing the characteristic haptophyte pigment suite, and may supplement carbon acquisition through bacterivory or ingestion of dissolved organic matter. Chrysochromulina species as a group produce a variety of secondary metabolites, and some species form large surface blooms in stratified coastal waters. C. fragilis itself has not been associated with harmful bloom events in the published literature. It carries a conservation status of Not Evaluated under IUCN criteria. Continued ultrastructural, biochemical, and molecular studies of Norwegian Chrysochromulina species continue to illuminate the extraordinary diversity of this genus.

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。