Respondents
A total of 273 responses were received from 108 countries (Fig. 1). Multiple responses were received from 62 countries. Figure 1 uses a colour gradient to indicate the number of responses per country. The largest number of responses received from a single country was 12, from Ecuador. For 66 countries (61%), a response was received from a person representing the government.
The responses to the survey were well-representative of global honey production and pollination services. Responses were received from 17 of the 18 largest honey-producing countries and accounted for 90% of the global honey production in 2017 (FAO 2020b). Responding countries covered approximately 85% of the world’s land mass (Brinkhoff 2020).
More than half (51%) of survey respondents were scientists. Beekeepers were the next largest category (20%), followed by government officials (11%), veterinarians (9%) and non-governmental organizations (6%).
Species and subspecies reported
All 11 Apis species of honeybees were reported in at least one country, i.e. A. mellifera, A. cerana, A. florea, A. dorsata, A. laboriosa, A. nigrocincta, A. andreniformis, A. binghami, A. breviligula, A. koschevnikovi and A. nuluensis. The first six of these species were reported to be actively managed in some manner (e.g. for honey production or pollination) in at least one country.
Apis mellifera was reported present and managed in all but one country (Tonga), and other literature reports its presence there (Chapman et al. 2019). The ubiquity of A. mellifera was also reflected by the fact that the species was considered “native” by many respondents from the Americas, despite its origin in the Eastern Hemisphere. The next most widely reported species was the dwarf honeybee, A. florea, present in 21 countries, followed by the Asian honeybee, A. cerana, in 16 countries. Apis cerana was much more frequently managed (15 countries) than A. florea (5).
Eighty-five countries identified local Apis subspecies. Twenty-six subspecies of A. mellifera were reported, along with various hybrids. A. m. ligustica, A. m. carnica, A. m. mellifera and A. m. scutellata were the four most common subspecies.
The survey emphasized bee pollinators, but respondents were asked to indicate other species of importance. Non-Apis bees were reported by 101 countries (94%) and managed in 78 countries. The most commonly managed species were bumblebees (Bombus spp.), in 60 countries. Some Bombus species are raised commercially (e.g. Desjardins and De Oliveira 2006; Zhang et al. 2015). Bombus species were followed by stingless bees (Meliponini spp., 25 countries), mason bees (Osmia spp., 19), leafcutter bees (Family Megachiliadae, 17), carpenter bees (Xylocopa spp., 14) and sweat bees (Family Halictidae, 10).
Among non-bee species, butterflies were the most common pollinator, cited by 82 countries (76%). Other pollinators reported by more than half of the countries were flies (63%), wasps (59%) and birds (54%).
With respect to individual species, B. terrestris was specifically noted by 19 countries. Other species cited multiple times were M. rotundata (11), B. impatiens (4) and several Osmia species.
Countries had the opportunity to mention particularly important pollinators and pollinated crops. For honeybees, 89 countries indicated pollinated crops. Among these, 81 (91%) mentioned fruit trees, with tree species depending on geographical location and climate. Other important crops were cucurbit species (35 countries, 39%), brassicas (33, 37%), pulses (22, 24%) and sunflowers (20, 22%). Fewer countries reported specific relationships between crops and non-Apis pollinators. The most commonly named combinations were Bombus species with tomatoes and other greenhouse crops and Megachiliadae species with leguminous forage crops such as alfalfa and clover.
Monitoring of pollinators
Population monitoring is critical for preventing the extinction of species and managing their genetic diversity. Table II shows the numbers of countries with systems for monitoring, distinguishing between honeybees and other pollinators. Monitoring of honeybees was more commonly practiced (78 vs. 44 countries; p < 0.001, Fisher’s exact test). This result was notable considering that many more species of pollinators than honeybees were potentially available for monitoring. Various countries have reported national honeybee monitoring programmes (e.g. Porrini et al. 2016; Kulhanek et al. 2017).
Table II Numbers and proportions (%) of countries with national systems for monitoring of pollinator populations Indicating the monitored species was voluntary and was reported by 20 countries. Eighteen countries confirmed monitoring of non-Apis bees, including eight countries that monitor one or more Bombus species. Butterflies, moths, birds and bats were other species reported by at least one country. Several countries, in Europe especially, mentioned the monitoring of a large range in species.
Respondents were asked to identify the responsible authority monitoring honeybees. While the government was most often cited (61 countries), respondents frequently named more than one entity. Beekeeper associations were reported in 50 countries, and scientists and research organizations in 46 countries. Fewer than 20% of countries rely on a single actor and more than 40% involve all three of these entities. When only a single actor was responsible for monitoring, it was usually the government (10 of 15 instances).
Among the countries that do not monitor honeybees, 28 indicated reasons for this absence. Lack of funding (20 countries) was the most common reason. Multiple responses were accepted; lack of political will (13), lack of awareness regarding the importance of such information (11) and low national priority (11) were also frequently reported.
Trends in populations of honeybees and other pollinators
The distributions of population trends for honeybees and other pollinators according the statistical analysis accounting for effects of global regions are in Fig. 2. The AIC was minimized when the region was the only explanatory effect. Therefore, the role of the respondent had no significant impact on his or her response. A substantial difference is evident between population trends of honeybees and other pollinators. Honeybee populations were perceived to be or stable or increasing by more than 50% of respondents in all regions, whereas populations of other pollinators were perceived to be decreasing by at least 50% of the respondents in all regions except Oceania. Among countries with monitoring programmes, around 70% reported decreasing populations of non-honeybee pollinators, whereas 77% reported that honeybee populations were steady or increasing.
The only statistically significant difference (p < 0.05) for honeybees was between Northern America and Sub-Saharan Africa. Nearly 90% of respondents from Northern America reported a positive or stable trend, whereas this proportion was just slightly greater than 50% for Sub-Saharan Africa. For other pollinators, the only significant (p < 0.05) difference was between Europe and Asia. Most of the respondents from both regions perceived general pollinator populations to be declining, but this view was more common in Europe (87% vs. 56% of respondents).
Specific monitoring of the genetic diversity of honeybees was much less common than monitoring the population status of either honeybees or other pollinators. Only 30 countries (28%) undertake this activity. The questionnaire did not specify whether diversity was defined as within or across subspecies; responses generally referred to monitoring within subspecies. Various approaches were described for this activity. These approaches included pedigree, molecular and morphometric-based methods, each of which were reported in five countries, with many countries applying multiple approaches. Among the 25 countries for which a trend in genetic diversity was reported, it was either steady or increasing in 20.
Threats to honeybees and other pollinators
The results of the analysis of perceived threats to honeybees and other pollinators are in Fig. 3. The region was again the only significant effect, indicating that professional role of the respondent had no substantial effect the threats he or she perceived to be most important. Regarding honeybees, the main threat identified was the Varroa destructor mite. The average score for the threat of V. destructor was 1.6 (maximum of 3.0) with a significant (p < 0.05) regional variation.
The second greatest threat for honeybees was pesticides (1.2), followed by habitat loss and degradation (0.8) and climate change (0.7). Significant (p < 0.05) regional differences were observed for seven of the classes of honeybee threats. Varroa destructor was the most important threat in Asia, Europe, North Africa and Northern America. Pesticides were the most important in Latin America, habitat loss and degradation in Sub-Saharan Africa and bacterial and fungal diseases in Oceania. Regional variability was particularly common among threats involving diseases, pests and parasites. For example, V. destructor was reported as the main threat much more frequently in Northern America (2.5) and Europe (2.4) than in sub-Saharan Africa (0.7) and Oceania (1.0). Native African subspecies of A. mellifera are less susceptible to V. destructor than subspecies native to Europe (e.g. Locke 2016). Among the responding countries from Oceania, V. destructor is primarily established only in New Zealand (Iwasaki et al. 2015). Significant regional variation was also present for the importance of habitat loss and degradation, pesticides and climate change.
In addition to differences in species and subspecies of pollinators and pests, regions also differ substantially in beekeeping practices and environments, including crop production environments. For example, the commercial pollination and beekeeping industries are much more important in North America than in Africa, where beekeeping of often informal and often includes the use of natural nesting sites (e.g. Lowore et al. 2018). These factors may impact the relative importance of threats.
For other pollinators, the main perceived threats were habitat loss and degradation (average = 1.7), pesticides (0.8), agricultural intensification (0.8) and climate change (0.8). Northern Africa, for which pesticides ranked as most threatening, was the only region where habitat loss and degradation were not considered the most important threat. However, regional differences were not significant for any of the threats to general pollinators.
Conservation and protection activities for honeybees and other pollinators
For honeybees, conservation or protection measures were reported for 72 countries (67%) versus only 54 (50%) for other pollinators. No significant differences were observed among the native range of A. mellifera (Africa, Europe and the Near East, 70%), A. cerana (East and Southeast Asia, 71%) and other countries (58%). A much more substantial association was seen for level of economic development. Among OECD countries, 94% reported protection activities for honeybees, versus 55% for non-OECD countries (p < 0.0001). A smaller difference was observed for conservation activities for other pollinators (66% vs. 42%; p < 0.04).
The government is the most common actor for both protection of domesticated honeybees and conservation of wild pollinators, with a slightly greater role (87% of the countries with conservation measures) for other pollinators than for honeybees (83%). Research institutions are the second most important actor for both species groups (56 vs. 41 countries for honeybees and other pollinators). Beekeeper organizations were reported to play an active role in protection of honeybees in almost half (52) of countries. Conservation organizations play a role in slightly less than a third of countries for both species groups, with a slightly greater importance (34 vs. 30 countries) for other pollinators.
Figure 4 shows the numbers of countries undertaking various activities to support protection of honeybees and conservation of other pollinators. Research was the most common activity for honeybees, being performed in 64 of the 72 countries reporting some activity. However, research was a complementary activity; no country reported research as the only measure. Conservation of native populations and pesticide regulations were the next most frequently performed activities, in 57 and 55 countries, respectively. The least common activity for honeybees, habitat conservation or restoration, was reported in 43 countries, which was nevertheless more common than any conservation measure for other pollinators. For these species, the six activities in Fig. 4 were all being undertaken with similar frequency.
Regarding specific pollinator friendly farming practices (no figure or table), integrated pest management was reported by 43 and 35 countries for the benefit of honeybees and other pollinators, respectively. Planting of hedgerows and flower strips was reported by 42 and 29 countries, for honeybees and other pollinators, respectively. Among activities specific to honeybees, 21 countries take measures to preserve honeybee germplasm and 15 countries own and manage honeybee colonies. For non-honeybee pollinators, 22 countries provide or protect nesting resources.