Cliff Mining Bee vs Compact brome

Andrena thoracica compared with Bromus madritensis

Key Differences

Cliff Mining Bee is Extinct while Compact brome is Not Evaluated.

Taxonomic Classification

Rank	Cliff Mining Bee	Compact brome
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Arthropoda (Arthropods)	Magnoliophyta (Flowering Plants)
Class	Insecta (Insects)	Liliopsida (Monocots)
Order	Hymenoptera (Ants, Bees & Wasps)	Poales (Grasses)
Family	Andrenidae	Poaceae (Grass Family)
Genus	Andrena	Bromus
Species	Andrena thoracica	Bromus madritensis

Conservation Status

Cliff Mining Bee

EX — Extinct

Compact brome

NE — Not Evaluated

Physical Characteristics

Attribute	Cliff Mining Bee	Compact brome
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Cliff Mining Bee

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Denmark, Luxembourg, Norway, and Sweden.

Compact brome

Habitat

Typically found in grasslands, wetlands, forests, and cultivated landscapes.

Range

Widely distributed across Africa (South Africa), Asia (Japan), Europe (15 countries), North America (Mexico, United States), Oceania and the Pacific (Australia), and South America (Chile).

Cliff Mining Bee

The Cliff Mining Bee, Andrena species in the family Andrenidae, is a solitary ground-nesting bee that excavates tunnels in cliff faces, earthen banks, and compacted sandy or loamy soils, where the loose or friable substrates exposed in cliff profiles provide ideal nesting conditions. Mining bees in the genus Andrena are among the most species-rich solitary bee genera in the world, with hundreds of species across the Holarctic region, many narrowly specialized in their choice of pollen host plants. Female cliff mining bees construct vertical or angled burrows in cliff faces, with lateral cells off the main shaft, each containing a pollen ball and a single egg. Males are typically smaller and emerge before females to establish territories near nesting sites. Many Andrena species are oligolectic, collecting pollen from only a small number of plant species, making their populations sensitive to the availability of specific flowering plants in the landscape surrounding nesting areas. Cliff and bank nesting habitats provide well-drained, sun-warmed substrates essential for brood development. The loss of natural cliff faces and earthen banks to development, vegetation succession, and quarrying reduces available nesting habitat for cliff mining bees.

Compact brome

<em>Bromus madritensis</em>, compact brome or Madrid brome, is an annual grass in the family Poaceae with an expansive native distribution across the Mediterranean basin, extending into parts of Africa, the Middle East, and central Asia. It has also been widely introduced to North America, South America, Australia, and other regions, where it is often considered an invasive weed in disturbed grasslands and shrublands. The species grows typically to 15–50 centimetres in height, producing dense, compact panicles with characteristic bristle-tipped spikelets that aid seed dispersal by attachment to passing animals and clothing. It thrives in dry, disturbed habitats including roadsides, agricultural margins, coastal scrub, and degraded grasslands, demonstrating strong tolerance for poor soils and seasonal drought. Compact brome is a pioneer species that colonises bare ground rapidly and can outcompete native herbaceous vegetation in fragile ecosystems, particularly in California chaparral and Mediterranean-climate shrublands. It is Not Evaluated on the IUCN Red List, consistent with its abundance and broad distribution. The species completes its life cycle entirely within a single growing season, germinating in autumn or winter and setting seed by late spring. Biological traits including precise lifespan data are inherent to its annual habit, but additional morphological and population data remain variable across its wide geographic range.