Common Gold-Dust vs Polar bear

Chrysothrix xanthina compared with Ursus maritimus

Key Differences

Common Gold-Dust is Not Evaluated while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Common Gold-Dust	Polar bear
Kingdom	Fungi (菌界)	Animalia (動物)
Phylum	Ascomycota (子嚢菌門)	Chordata (脊索動物)
Class	Arthoniomycetes (ホシゴケ菌綱)	Mammalia (哺乳類)
Order	Arthoniales (Arthoniales)	Carnivora (ネコ目)
Family	Chrysotrichaceae	Ursidae (Bears)
Genus	Chrysothrix	Ursus (Bears)
Species	Chrysothrix xanthina	Ursus maritimus

Conservation Status

Common Gold-Dust

NE — Not Evaluated

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Common Gold-Dust	Polar bear
Diet	—	Carnivore
Average Lifespan	—	25 years
Average Length	—	2.4 m
Average Weight	—	450.0 kg

Habitat & Geographic Range

Common Gold-Dust

Habitat

Native to North America and South America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Brazil, Colombia, and United States.

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.

Common Gold-Dust

Chrysothrix xanthina, commonly known as common gold-dust, is a crustose lichen in the family Chrysotrichaceae. The species has been documented in Brazil, Colombia, and the United States, indicating a distribution across parts of South and North America. Lichens in the genus Chrysothrix are characterized by their powdery, brightly colored thallus, and C. xanthina is typically recognized by its distinctive yellow-gold granular coating on its substrate, produced by pigments including calycin and vulpinic acid. Chrysothrix xanthina typically grows on the bark of trees and occasionally on rock surfaces in humid forest and woodland habitats, where it forms conspicuous yellow patches. The species is not currently evaluated for conservation status. Biological traits of this species remain poorly documented in the scientific literature. As a lichen, Chrysothrix xanthina represents a symbiotic association between a fungal partner (mycobiont) and one or more photosynthetic partners (algae or cyanobacteria), and contributes to nutrient cycling and substrate weathering in the ecosystems it inhabits.

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。