Pogonomyrmex salinus

Olsen, 1934

Owyhee Harvester Ant

salinus is a to sagebrush-steppe of the western United States. A 5-year field study in southwestern Idaho documented colony dynamics and vegetation associations, finding inversely related to sagebrush cover and positively associated with non-cheatgrass understory vegetation. The species avoids cheatgrass seeds in its diet, preferring small-seeded grasses and forbs. Colony survival rates improve after the first year, with 12.4% first-year failure compared to 4.6–8.4% in subsequent years.

Pogonomyrmex salinus casent0005719 dorsal 1 by wikipedia. Used under a CC BY 4.0 license.

Pogonomyrmex salinus casent0005719 head 1 by wikipedia. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Pogonomyrmex salinus: //ˌpɒɡənoʊˈmɜːrmɛks səˈlaɪnəs//

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Habitat

Sagebrush-steppe in southwestern Idaho and adjacent regions. Prefers open areas with exposed ground where vegetation can be cleared from nest vicinities. correlates negatively with sagebrush cover and positively with coverage of non-Bromus (non-cheatgrass) understory vegetation.

Distribution

Western United States, specifically documented from southwestern Idaho. The ' range likely extends through suitable sagebrush-steppe in the region.

Diet

Primarily seeds; specifically avoids cheatgrass (Bromus) seeds while preferring small-seeded grasses and forbs.

Life Cycle

Colony establishment involves nest initiation; first-year colonies experience higher failure rates (12.4%) compared to established colonies (4.6–8.4% failure in years 2–4). Up to 7.1% of colony initiations may represent nest relocations rather than new colonies.

Behavior

Morning patrollers inspect areas up to 20 minutes distance from the nest, signaling the colony to deploy foragers. Foragers may travel up to 20 meters from the colony and spend up to an hour seeds, with approximately 90% return success rate. Constructs large nest cleared of vegetation.

Ecological Role

Functions as a seed and agent in sagebrush-steppe . Colony nest rims create 'islands of ' that enhance vegetation growth, particularly during drought and disturbance events. May influence composition through selective seed .

Human Relevance

Potential impact on restoration efforts in sagebrush-steppe undergoing conversion to open grasslands. The ' preference for small-seeded native grasses and forbs over cheatgrass may affect seed survival rates in restoration contexts.

Similar Taxa

Pogonomyrmex occidentalisBoth are western North with similar nest-clearing and sagebrush-steppe associations; P. salinus is distinguished by its specific Owyhee region distribution and documented cheatgrass seed avoidance
Pogonomyrmex californicusShares and seed- ; differs in geographic distribution (California and desert Southwest vs. Idaho sagebrush-steppe) and specific vegetation associations

More Details

Colony Dynamics

Over a 5-year study period, total colony numbers increased from 843 to 878 (4.15%) across 16 sites, with 315 colony deaths and 350 colony initiations. Spatial distribution was generally random, with only one of 11 analyzed sites showing significant clumping. Final-year ranged from 0.1 to 62.9 colonies per hectare.

Habitat Transition Concerns

The rapid transition from sagebrush-dominated to open grasslands throughout the western United States may negatively impact whose seeds are readily consumed by P. salinus, as the species thrives in open grassland conditions.