Bembidion quadrimaculatum oppositum
Say, 1823
Bembidion quadrimaculatum oppositum is a of in the . It was described by Thomas Say in 1823, originally as Bembidium oppositum. The subspecies has been documented in agricultural studies as a ground beetle sensitive to soil management practices. Historical distribution records indicate presence across parts of Europe, Asia, and North America including Alaska, though specific associations remain poorly documented.
Pronunciation
How to pronounce Bembidion quadrimaculatum oppositum: /bɛmˈbɪdi.ɒn kwɒˌdrɪˌmækjʊˈleɪtəm əˌpɒsɪˈtəʊm/
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Identification
No distinguishing features for this are documented in available sources. As a member of Bembidion quadrimaculatum, it presumably shares the ' characteristic small size and ground-dwelling habit, but subspecific diagnostic traits are not specified.
Distribution
Documented from: (former) Yugoslavia, Afghanistan, Alaska, Armenia, and Austria. The Alaskan record represents a notable disjunct distribution from the Eurasian localities.
Behavior
Has been observed as a component of in strip-tilled agricultural fields, where it was captured as the second most abundant in one year of a two-year study. Its presence in such indicates for disturbed, open ground conditions with reduced tillage intensity.
Ecological Role
Functions as a ground-dwelling within . Its sensitivity to tillage practices, as demonstrated in comparative agricultural studies, suggests it serves as a bioindicator for soil management impacts on .
Human Relevance
Recognized as a in agricultural contexts. Strip tillage practices that reduce soil disturbance have been shown to support of this , indicating its potential value in and programs.
Similar Taxa
- Bembidion rapidumCo-occurs in strip-tilled agricultural and was captured alongside B. quadrimaculatum oppositum in the same study, suggesting similar ecological preferences for reduced-tillage environments.
- Harpalus pensylvanicus in the same agricultural study system; B. quadrimaculatum oppositum was subdominant to this species, indicating shared use in strip-tilled fields.
More Details
Agricultural Study Context
In a 2013-2014 study of in squash and melon fields, Bembidion quadrimaculatum oppositum was the second most abundant captured in the second year, with 3,369 total specimens representing 38 species recorded across all treatments. Strip tillage was found to be less disruptive to this species than plasticulture production methods.
Taxonomic History
Originally described as Bembidium oppositum by Thomas Say in 1823, later treated as a of Bembidion quadrimaculatum. The basionym reflects early 19th century nomenclatural practices for small .