From Wikipedia:  Bioturbation is the reworking of soils and sediments by animals or plants.[1] Its effects include changing texture of sediments (diagenetic), bioirrigation and displacement of microorganisms and non-living particles. Activities, such as burrowing, ingestion and defecation of sediment grains, construction and maintenance of galleries, and infilling of abandoned dwellings, displace sediment grains and mix the sediment matrix. In modern ecological theory, bioturbation is recognised as an archetypal example of ‘ecosystem engineering’, modifying geochemical gradients, redistributing food resources, viruses,bacteria, resting stages and eggs. 

These native bees were very busy engineering the ecosystem at the Southview Oak Savanna this week!