Wild honey bee colonies—both truly wild (in trees and buildings) and simulated wild (in small hives)—were studied to determine their life-history traits, to see if these traits have changed now that these colonies are infested with Varroa destructor . Most colonies (97%) survive summers, but only 23% of founder (first-year) colonies and 84% of established colonies survive winters. Established colonies have a mean lifespan of 5–6 years and most (87%) have a queen turnover (probably by swarming) each summer. A population model shows that these life-history traits produce a stable population of colonies. Remarkably, the suite of colony life-history traits found in the 2010s (with V. destructor ) matches that found in the 1970s (without V. destructor ). It seems likely that the wild colonies living near Ithaca, NY, possess defenses against V. destructor that are not costly.
8. Juni 2020 Experimentierfeld: Hanfbeton-Beute Wenn man „Hanfschäben“, die holzigen, äusseren Teile der Hanfpflanze, mit magnesiumhaltigen Kalken (Grenoble-Kalk) mischt, entsteht daraus eine Art Naturbeton. Hanf-Kalkstein hat ähnliche feuchtigkeitsregulierende Eigenschaften wie
Golden ratio in the elliptical honeycomb The honeybee comb, which is highly similar among honeybee species, is a mass of six–sided cells made by honeybees. It contains the brood, the
Korrektur Artikel “Asiatische Hornissen: Innovative Fangtechniken zum Schutz der Biodiversität” im Bulletin Nr. 31 – Sommer 2024 Liebe Leserinnen und Leser Im Rahmen unseres Bestrebens nach höchster Qualität und Genauigkeit