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Opsætningen af honningbier skader både vilde bier OG frugtsætningen, viser nyt studie.

 In Bi-politisk, Fakta om bier, Nyheder

Der bliver færre vilde bier, færre forskellige biarter, OG lavere frugtsætning, når der sættes honningbier op i marker med bestøvningskrævende afgrøder – ligegyldigt om der laves blomsterstriber eller ej. Det viser nyt amerikansk studie.

I USA har man undersøgt, hvad der sker i jordbær- og squash-marker, når man sætter honningbier op for at fremme bestøvningen – altså mængden af afgrøder.
-Og hvad nu hvis man samtidig prøver at understøtte både honningbier og vilde bier med blomsterstriber?, ville forskerne vide.

Resultaterne er offentliggjort i det ansete nature.com.
https://www.nature.com/articles/s41598-021-81967-1

Uanset, om man laver tilhørende blomsterstriber, så viser resultaterne, at konsekvenserne af opsætning af honningbistader er, at der bliver færre vilde bier, færre FORSKELLIGE arter af bier – OG at afkastet af jordbær og squash bliver dårligere.

Conclusion
The results of our study suggest that under some circumstances, supplementing farms with honey bee hives could detract from fruit count in pollinator-dependent crops and decrease wild bee abundance and species richness. Moreover, although wildflower strips provided a limited boost to fruit count, they did not alleviate honey bee hive-associated decreases in fruit count or decreases in wild bees on farms. As such, our study implies honey bee hives may detract from the goals of wildflower strips to enhance fruit count and support wild pollinator populations. Our research also suggests wild pollinators in the Mid-Atlantic region may have the potential to meet or exceed pollination services by honey bees in pollinator-dependent crops such as strawberry and winter squash. We suggest future work to investigate whether similar effects occur in larger-scale crop production, in other pollinator-dependent crop systems, and with regional variations in wild pollinator communities. More work identifying appropriate honey bee density thresholds relative to wild pollinator populations would benefit growers making management decisions and help them avoid financial costs or even yield reductions resulting from unnecessary hive rental.

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