Abstract
Simple SummaryThe western honey bee, a pollinator species that is essential for modern agriculture and food production sustainability, is under various anthropogenic pressures. In the last few decades, these have led to serious worldwide problems concerning the health and stability of honey bee colonies. The importance of wild or feral honey bees has only recently been recognized, as these populations are crucial for research on the processes that enable their survival under such pressures. Here, we present a case of an unmanaged free-living population of honey bees that, unlike in other known studies, live in a highly populated urban environment. This extraordinarily dense feral honey bee population, which is not directly associated with managed apiaries, provided us with a large dataset of various life history parameters that will considerably fill in the knowledge gaps on unmanaged colonies. Furthermore, we want to underline the importance of citizen science in the data collection process and suggest it as a suitable approach to study feral honey bees in urban landscapes. We believe that highly populated urban landscapes can support and reinforce feral honey bees and that similar citizen science projects should be set up in other urban areas or other countries.It is assumed that wild honey bees have become largely extinct across Europe since the 1980s, following the introduction of exotic ectoparasitic mite (Varroa) and the associated spillover of various pathogens. However, several recent studies reported on unmanaged colonies that survived the Varroa mite infestation. Herewith, we present another case of unmanaged, free-living population of honey bees in SE Europe, a rare case of feral bees inhabiting a large and highly populated urban area: Belgrade, the capital of Serbia. We compiled a massive data-set derived from opportunistic citizen science (>1300 records) during the 2011–2017 period and investigated whether these honey bee colonies and the high incidence of swarms could be a result of a stable, self-sustaining feral population (i.e., not of regular inflow of swarms escaping from local managed apiaries), and discussed various explanations for its existence. We also present the possibilities and challenges associated with the detection and effective monitoring of feral/wild honey bees in urban settings, and the role of citizen science in such endeavors. Our results will underpin ongoing initiatives to better understand and support naturally selected resistance mechanisms against the Varroa mite, which should contribute to alleviating current threats and risks to global apiculture and food production security.
Highlights
IntroductionThe western honey bee, Apis mellifera Linnaeus, 1758, is recognized as the single most important pollinator species, vital to the success of modern agriculture and the stability of human food production [1,2,3,4,5], let alone the provisioning of honey and other bee-products.There is a worldwide concern regarding the trends of its populations, including various health issues and maintenance of sufficient pollination ecosystem service [3,6,7,8,9,10,11,12,13,14]
For the context of our research, it is important to stress that urban beekeeping was almost a non-existent activity in most of the urban core of Belgrade (BBS, personal communication; the situation is slowly changing after 2018)
It seems quite unlikely that so many free-living colonies in these central areas are derived from regular swarm inflow from managed hives
Summary
The western honey bee, Apis mellifera Linnaeus, 1758, is recognized as the single most important pollinator species, vital to the success of modern agriculture and the stability of human food production [1,2,3,4,5], let alone the provisioning of honey and other bee-products.There is a worldwide concern regarding the trends of its populations, including various health issues and maintenance of sufficient pollination ecosystem service [3,6,7,8,9,10,11,12,13,14]. The exotic ectoparasitic mite Varroa destructor (hereafter: Varroa) is considered the most significant threat to western honey bee in many parts of the world [18,19,20,21,22,23], largely contributing to widespread colony losses [24,25]. Several studies reported that both feral and managed colonies can survive for an extended period despite of Varroa infestation, and without receiving any treatments, triggering wide scientific and public attention [28,29,30,31,32,33,34,35,36,37]
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