Thus, according to the greatest available scientific and you will industrial advice, we are checklist the latest rusty patched bumble bee as the an endangered kinds in accordance with parts 3(6) and you can cuatro(a)(1) of your own Operate
Pesticide use, such as the usage of of a lot pesticides having identified dangerous and you will sublethal consequences so you can bumble bees, is happening at expanding account rangewide (Foundation E). Furthermore, herbicide fool around with happens rangewide and can dump readily available floral info (Factor An excellent). While doing so, the brand new rusty patched bumble-bee is unable to needless to say recolonize unoccupied section which are not connected by the suitable dispersal environment (Facts Good and you may Elizabeth).
The fresh varieties may experience an excellent diploid male vortex, the spot where the quantity of nonviable males increases because the variety refuses, and therefore next cutting population dimensions (Factor Elizabeth). There’s zero redundancy off populations contained in this for each and every occupied ecoregion, subsequent raising the likelihood of loss of image regarding established genetic lineages and you will, sooner, extinction.
These dangers have lead to the fresh new extirpation of rusty patched bumble bee during the a projected 87 per cent of their range, and these risks will most likely remain otherwise rise in severity.