Abstract
There is pressing need to anticipate the impacts of climate change on species and their functional contributions to ecosystem processes. Our objective is to evaluate the potential bee response to climate change considering (1) response traits—body size, nest site, and sociality; (2) contributions to ecosystem services (effect trait)—crop pollination; and (3) bees’ size of current occurrence area. We analyzed 216 species occurring at the Carajás National Forest (Eastern Amazon, Pará, Brazil), using two different algorithms and geographically explicit data. We modeled the current occurrence area of bees and projected their range shift under future climate change scenarios through species distribution modeling. We then tested the relationship of potential loss of occurrence area with bee traits and current occurrence area. Our projections show that 95% of bee species will face a decline in their total occurrence area, and only 15 to 4% will find climatically suitable habitats in Carajás. The results indicate an overall reduction in suitable areas for all traits analyzed. Bees presenting medium and restricted geographic distributions, as well as vital crop pollinators, will experience significantly higher losses in occurrence area. The potentially remaining species will be the wide-range habitat generalists, and the decline in crop-pollinator species will probably pose negative impact on pollination service. The north of Pará presented the greatest future climatic suitability and can be considered for conservation purposes. These findings emphasize the detrimental effects on biodiversity and agricultural production by climate change and provide data to support conservation planning.
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Introduction
Pollinating bees play a fundamental role in angiosperm reproduction (Ollerton 2017), in both natural and agricultural environments (Klein et al. 2007; Potts et al. 2016). They are essential to safeguard global food security due to their worldwide importance for crop production (Garibaldi et al. 2013; Potts et al. 2016). Besides, they actively contribute to the recovery of degraded ecosystems (Montoya et al. 2012; Williams and Lonsdorf 2018) and can also play a crucial role in sustainable development projects and programs (Wolff and Gomes 2015), by providing an extra source of income to traditional and low-income communities (Jaffé et al. 2015). Bee populations are in decline as a result of human activities, and the leading causes include changes in land use, competition with invasive species, pathogens, agrochemical usage, and climate change (Biesmeijer et al. 2006; Brown and Paxton 2009; Potts et al. 2010). This seems to be a general trend among insects since a recent review showed that global entomofauna is under severe threat of extinction, particularly those taxa belonging to Hymenoptera (Sánchez-Bayo and Wyckhuys 2019).
Anthropogenic climate change is a major menace for populations of both natural and managed species worldwide (Pacifici et al. 2017; Potts et al. 2016; Rafferty 2017), and the impacts of climate shift are already affecting species distributions, abundance, morphology, and phenology (MacLean and Beissinger 2017; Pacifici et al. 2015).
Climate is an important factor for pollinating bee species. Recent studies have shown that climate influences the community of pollinators (Devoto et al. 2009) and their behavior (Santos et al. 2015), potentially causing local extinction (Martins et al. 2015a, b). Potential reductions and shifts in the geographical distribution of crop pollinators were also projected due to climate change. One evaluation of bee pollinators projected losses of suitable occurrence areas for most of the evaluated species in Brazil (Giannini et al. 2012). Another study showed that passion fruit pollinators belonging to the genus Xylocopa could face reductions of up to 90% in their distribution areas in the Brazilian savanna (Giannini et al. 2013). A potential reduction of 8–18% in coffee-pollinating bees has been demonstrated for Latin America, affecting up to 30% of the future area of coffee production (Imbach et al. 2017). The tomato pollinators will likely face reductions in their areas of occurrence in Brazil, and Bombus morio Swederus 1787 will potentially face the largest reduction (up to 71% in the most pessimistic scenario) (Elias et al. 2017). Recent analysis considered the impact of climate change on the distribution of pollinators of 13 different agricultural crops in Brazil, showing that more than 90% of the municipalities that produce some of the analyzed crops will suffer loss of pollinators, and consequently some economical loss (Giannini et al. 2017).
Changes in rainfall and temperature regimes in response to greenhouse gas emissions may result, for example, in an average increase of 2 to 4 °C in global temperatures by 2050 (IPCC 2014). In the Amazon biome, climate change may alter the intensity (IPCC 2014), frequency (Marengo et al. 2009), and duration of extreme climatic events (Christensen et al. 2007). Results can include climate-induced shifts in species composition (Esquivel-Muelbert et al. 2018), and also ecological mismatches (Wood et al. 2018), which may compromise ecosystem functionality (Fei et al. 2017). Thus, understanding species responses to ongoing changes is imperative in order to maintain ecosystem functioning and sustainability.
One way to predict an organisms’ response to environmental changes (e.g., land use, competition, resource availability, and climate) is the use of species traits (response traits) (Schleuning et al. 2015). Species traits are any characteristic of an individual that can be assigned to a species, which could be phenological, morphological, physiological, reproductive, or behavioral (Kissling et al. 2018). Not only can species’ responses be measured and predicted by using trait-based approaches but also their contribution to ecosystem functions and services, and the potential impacts of non-random species loss on these processes (effect traits) (Bartomeus et al. 2018). For example, pollinators’ body size influences the response to land-use change (Steffan-Dewenter and Tscharntke 1999; Benjamin et al. 2014; Aguirre-Gutiérrez et al. 2016; Mayes et al. 2019), the compatibility with different floral morphologies (Armbruster and Muchhala 2009), and, also, the pollination efficiency per visit (i.e., pollen deposition) (Martins et al. 2015a, b).
Besides body size, other response traits can affect bee species when facing ecosystem pressures (De Palma et al. 2015). For example, nesting and foraging habits are strongly related to land use, with ground-nesting and polylectic bees being much less affected by agricultural or livestock expansion than cavity-nesting and oligolectic bees (Coutinho et al. 2018). Sociality is also an important response trait that could be affected by different ecosystem pressures, as social species are often food generalists and have long periods of activity (Michener 2007). On the other hand, crop-pollinator species (effect trait) are key providers of pollination services in agricultural landscapes and, thus, shifts in their distribution can directly impact food production and human well-being (Costanza et al. 1997; Garibaldi et al., 2013). Also, the size of geographical distribution is an important characteristic, since geographically constrained species are more sensitive to environmental changes, as they might be restricted to local environmental factors influencing their distribution patterns (Bommarco et al. 2010).
In this study, we present the first extensive list of bee species recorded in the Carajás National Forest, a protected area in the Eastern Amazon (southeastern region of Pará State, Brazil), where biological surveys and sampling efforts have been carried out since the 1980s. Together, this list comprises approximately 80% of the bees found in the Brazilian Eastern Amazon (Moure et al. 2008). The Carajás forest is within a mosaic of protected areas, surrounded by areas strongly impacted by land-use change, mainly due to the expansion of livestock and agriculture (Souza-Filho et al. 2016). In our study area, at least 21 of the crops produced depend on bees for their pollination (Supplementary Information A). We considered crop pollinators the bee species previously quoted on the literature as being effective pollinators of those crops (following Giannini et al. 2015a; Campbell et al. 2018). Bee species quoted as visitors were not included.
Here we evaluate the potential response of bees occurring in the Carajás National Forest (Eastern Amazon) to climate change considering (1) response traits—body size, nest site, and sociality; (2) contributions to ecosystem services (effect trait)—crop pollination; and (3) bees’ size of current occurrence area (Fig. 1). For this, we built a database of bee species and their traits and analyzed the impact of climate change on their distribution through species distribution modeling. To our knowledge, this is the first study to measure the potential future impact of climatic changes on bee species taking into account both their response and effect traits; moreover, it is also the first one to analyze the impact of climate changes on Amazon bees.
Material and methods
Study area
The study area is the Carajás National Forest, a protected area located in the southeast region of Pará State, Brazil (5° 52′ 11″ to 6° 32′ 13″ S latitude and 49° 53′ 28″ to 50° 44′ 29″ W longitude) (Fig. 2). The forest total size is approximately 400,000 ha, located within a mosaic composed of six national protected areas, encompassing a total range of almost 1,300,000 ha (Fig. 2). The Carajás Mosaic is an Amazonian domain, with altitudinal range of 400–900 m, and montane Amazonian climate with average annual temperatures of approximately 21 to 22 °C. The rainy season extends from November to April with an average precipitation/month of 229 mm, accounting for 79% of total annual rainfall (approximately 1800 mm) (ICMBIO 2016).
Deforestation covers a great portion of the north and southeast of Pará, but in the western portion of the state, other protected areas can be found, relatively well-connected to large protected areas in the Western Amazon (Fig. 2). The high species richness found in preserved areas and the presence of considerable amount of degraded landscapes make the study site an area of particular importance for the understanding of the climate change impacts on pollinators.
List of bee species
The list of bee species reported for Carajás (Supplementary Information A) was determined from relevant scientific literature and public biodiversity data providers, such as speciesLink (a Brazilian repository of biodiversity data) and the Global Biodiversity Information Facility (GBIF). In addition, the final list was validated at the two Brazilian entomological collections that house the specimens collected in Carajás, pertaining to the Museu Paraense Emílio Goeldi (MPEG) and the Universidade Federal de Minas Gerais (UFMG).
In this study, we chose to use the list of bees from the Carajás for two main reasons. Firstly, multi-taxa surveys have been conducted in Carajás since 1981, including a great variety of bees, whose data are available at the previously mentioned entomological collections. Secondly, basic biological information about the bee species listed for Carajás is still scarce; studies on traits or climate change impact were not previously made, which hinders decision-making processes.
The exotic bee species Apis mellifera L. occurs in our study region, as well as across almost the entire American continent. This widespread species is considered a habitat-generalist bee and occurs in almost all types of biomes and on degraded landscapes (Giannini et al. 2015b). For this reason, this species was not modeled through species distribution modeling (SDM) (see below).
Traits
Three of our traits are related to bees’ response to the environment (body size, nest site, sociality), and one is related to their functional contribution and provision of ecosystem services (crop pollination). These functional traits were used to categorize the bees and to evaluate if there is a tendency in the effects of climate change on some of these categories, aiming to subsidize conservation actions.
We measured the body size (based on intertegular distance (ITD)) of five specimens (available at previously mentioned entomological collections) for each of the species included in our study region that had been identified to the species level by a specialist taxonomist. We classified the bees into three body size classes (small, medium, and large) following other authors (Benjamin et al. 2014; Wray et al. 2014). We used the body size of bees in the genus Melipona Illiger, 1806 as the standard for medium size; they are the largest stingless bees, but are smaller than solitary carpenter bees (Xylocopa species). While small Meliponini bees are more likely to access very small flowers (e.g., açai flowers, see Campbell et al. 2018), Melipona size-like bees would access medium-size flowers (e.g., eggplant, see Nunes-Silva et al. 2003), whereas carpenter bees would access large-size flowers (e.g., passionfruit, see Junqueira and Augusto 2017). Thus, we considered bees with an ITD below that of the smallest Melipona species (< 2.2 mm) as small; bees with ITD ranging between the smallest and the biggest Melipona species (≥ 2.2 and ≤ 3.9) were considered medium; and those with ITD larger than the largest Melipona species (> 3.9) were considered large.
We retrieved information about nest site, sociality, and crop pollination from the relevant scientific literature (Supplementary Information A). Nest sites were classified into five categories: cavity, exposed (usually hanging from tree branches or anthropogenic constructions), soil, termite, or multi (when the species are reported to build their nest in more than one of the considered categories). Sociality affects pollination services mainly through the increase of foragers on flowers and is classified here in three categories: social, solitary, or cleptoparasitic. We did not consider intermediate stages of sociality, as it was not the focus in this work. Crop pollination information is represented as yes (crop-pollinator species) or no (not previously reported as a crop pollinator) (following Giannini et al. 2015a; Campbell et al. 2018). We considered crop species listed by IBGE as occurring in the municipalities around our study site, as well as bee species previously quoted as their pollinators on the study area (we did not include, at any stage, bee species quoted as visitors) (Supplementary Information A and E).
Finally, for the size of current occurrence area, we used the model generated by each species through SDM (see below). We categorize the area size as follows: (1) restricted ≤ 441,000 km2; (2) 441,000 < medium ≤ 882,000 km2; and (3) wide > 882,000 km2. We chose these values based on the sizes of occurrence areas presented by our bee species (Supplementary Information A and B). We followed this simple categorization since there is no other similar analysis in the scientific literature using such a high number of species with such a heterogeneous distribution. We also emphasize here that these values are based in the total known distribution of each bee species, which was used to produce the models in the SDM (see below); most of species presents broad distribution, and there is no endemic species in the study area.
Species distribution modeling
Occurrence records of each bee species were retrieved from the two abovementioned biodiversity data repositories (speciesLink and GBIF: https://doi.org/10.15468/dl.8sujwg) and an internal database (named “bdbio”) totaling 11,952 records (Supplementary Information A and C), ranging from 2 to 347 occurrence points per species. Species occurrences were enough to produce good-quality models for the vast majority of species, which were supported by our modeling procedure that establishes a high threshold for model accuracy (TSS = 0.7, as explained below). A few species, however, presented low number of reported occurrences (< 10), which impeded modeling processes, and for this reason were not included in the present analysis (Table 1; Supplementary Information A).
For each species, we generated SDM models for the Neotropical region, as it represents the maximum complete distribution area of the bees in our dataset (Supplementary Information B), and, subsequently, models were projected only for Pará. This projection was chosen since our interest was to evaluate the future potential suitable areas outside of Carajás that could be suggested for the conservation of the analyzed bees and to evaluate the pollination service they provide in the same region. The dataset analyzed here is the best possible representative of each bee species distribution, since it compiles all updated available data; although there may be biases in the surveys conducted in the various regions encompassed by our analysis, SDM is considered a robust tool to be used in such a case (Peterson et al. 2011).
We used the biomod2 (Thuiller 2003) package for R (R Development Core Team) for SDM with two algorithms: maximum entropy (MAXENT; Phillips et al. 2006) and generalized linear model (GLM; McCullagh and Nelder 1989) algorithms. Both were chosen due to their frequent use and broad application (Li and Wang 2013). The environmental variables were chosen from the 20 least-correlated topo-bioclimatic layers (Aguirre-Gutiérrez et al. 2013) of the dataset available in WorldClim (Hijmans et al. 2005) that define the mean temperature and precipitation data for 1970–2000, as well as altitude. The following layers were used: altitude, isothermality, mean temperature of the driest quarter, annual precipitation, driest month, seasonality of precipitation, precipitation of the hottest quarter, and precipitation of the coldest quarter. We generated three sets of pseudo-absence data containing ten times the number of presence data randomly distributed (Chefaoui and Lobo 2008). The accuracy of the models was evaluated by true skill statistic (TSS) from three randomizations of 25% of the data, and the cutoff threshold of models was equal to 0.7, which produces highly accurate results and precludes model generation from poor data quality (Allouche et al. 2006).
The future scenarios were for the years 2050 and 2070, which were projected by the Hadley Center (HadGEM2-ES, Hadley Global Environment Model 2-Earth System) and the National Center for Atmospheric Research (CCSM4, The Complete Coupled System Model) and available on the WorldClim website with a 5-min arc resolution. Two greenhouse gas emission scenarios were used corresponding to representative concentration pathways (RCPs) equal to 4.5 and 8.5, which consider medium and high increases in emissions, respectively (IPCC 2014). Consensus models were built from calculating the averages of two scenarios (HadGEM2-ES and CCSM4) and the two algorithms (Maxent and GLM). To facilitate the interpretation and to standardize results, the final values of habitat suitability (i.e., the relative likelihood of occurrence) of a species were converted to percentages. The raster packages (Hijmans and Etten 2012) for R and the QGIS (Open Source Geospatial Foundation) were used for the spatial analysis.
Statistical analyses
The final models were used to calculate the occurrence range of the species in the current and future scenarios. We multiplied the cell area (10 × 10 = 100 km2) by the number of cells considered suitable by the model. Species richness was computed by stacking and summing the maps of all individual species for each scenario.
We quantified the proportional change in the size of occurrence area as the difference between the range in each future scenario and the current one (i.e., respFi = (area_futurei − area_current)/area_current; where i is a future scenario, see Supplementary Information A). We used the proportional change because species with wider range distribution may present higher loss rates simply because they have more area to lose than those more restrict species, and thus misleading the general trends of climate change effects. The betareg function in the betareg package (Cribari-Neto and Zeileis 2010) in R was used to model the potential loss of occurrence area in response to species traits. Predictor variables included all the traits and the size of current occurrence area (respFi ~ area.cat + size.cat + sociality + nest.location + crop.pollination, see Supplementary Information A). Beta regression shares properties with linear models, but is more applicable for modeling proportional data ranging from 0 to 1 (Ferrari and Cribari-Neto 2004). Only species with complete information on traits and those presenting future range losses were modeled (N = 151, Supplementary Information A). A transformation [(respFi × (number of observations − 1)) + 0.5)/number of observations] was applied to avoid zeros and ones (Smithson and Verkuilen 2006). The significant difference for each category was tested with post hoc Tukey tests as implemented in emmeans package for R.
Results
We obtained a total of 216 bee species recorded in the Carajás National Forest, which included representatives from the five bee families currently found in Brazil: Andrenidae (2 species), Apidae (189), Coletidae (2), Halictidae (15), and Megachilidae (8). Stingless bees accounted for 36% of bee species found in Carajás (77 species), whereas orchid bees accounted for 27% (59 species). Two genera of solitary bees alone correspond to 28% of the species (Euglossa Cockerell, 1917 with 39 species, and Centris Fabricius, 1804 with 23 species). We obtained the complete set of species traits for 167 of the species found in Carajás (Supplementary Information A). ITD ranged from 0.68 to 8.7 mm, with 65 species categorized as small, 38 medium, and 48 large body size. Solitary bees accounted for more than 50% of species (79 solitary species, 67 social, and 5 cleptoparasitic). Cavity-nesting bees totaled 81 species, 4 species build exposed nests, 38 nest in soil, 12 nest associated with termites, and 16 species use more than one nesting location. Of the analyzed species, 70 have been quoted as crop pollinators. As for bees’ occurrence area, 56 species were considered restricted, 54 presented medium occurrence areas, and 41 species presented wide occurrence areas.
Of the 216 total species, the impact of climate change could not be evaluated for 17 species (8%) (Table 1) due to the low number of occurrence points, making SDM unfeasible by the methodology used here (Supplementary Information A). The exotic bee species Apis mellifera L. was also not modeled, as already pointed. In addition, no current suitable habitats were projected for seven species. Of the total number of species analyzed by SDM (191 species), the vast majority (181 species, 95%) will potentially lose occurrence area; at least 135 (71%) will potentially lose more than 80% of occurrence area; and only between 29 (15%; 2050; RCP 4.5) and 7 (4%; 2070; RCP 8.5) will find suitable habitats specifically within Carajás in the future scenarios (Table 1; Supplementary Information A and D).
All beta regression analyses showed a good fit (pseudo-R2 ranging from 0.19 to 0.24, all P < 0.01; Table 2); however, only two of the analyzed characteristics showed significant differences related to the loss of suitable area in the future: size of current occurrence area and crop pollination (Fig. 3). In addition, these differences occur over short time periods (year 2050) and in the more optimistic scenario (RCP 4.5). Medium-to-restricted distributed species and crop pollinators will potentially be more negatively affected by short-term climatic changes occurring in the eastern portion of the Amazon basin (Fig. 3).
In general, the central and eastern portions of the Pará presented the highest species richness, according to our current projections (Fig. 4). Under future scenarios, a drastic potential reduction in the suitable habitats available for bee species has been detected. They will be restricted mainly to the northeast portion of the state, reaching a maximum of 80 (42%) species per grid cell (27 [24%] for species with restricted/medium distribution; or 18 [29%] for crop pollination species).
Discussion
Our models revealed that 95% of bees currently occurring on Carajás will face a decrease in occurrence area due to climate change impacts, and only 15 to 4% of the extant bee species will find climatically suitable habitats specifically in the Carajás region in the future. These results are particularly relevant since the diversity of bees in Carajás corresponds to 80% of species cited for the Eastern Amazon, as previously quoted, indicating that our study displays the general trends for bee distribution shifts in this area. Based on our models, species with restricted-to-medium occurrence areas and those that perform vital crop pollination services will suffer significantly higher losses in occurrence area, and the north portion of Pará will exhibit the most climatically suitable habitats for the analyzed bees.
The small number of bee species persisting in future scenarios on Carajás may have drastic consequences concerning interactions with the native flora. In our study, we reveal that the remnant bees (“winners”) will be wide-range habitat generalists, since bee species with restricted-to-medium occurrence areas will face significantly higher change on habitat suitability, which could imply on a wide trend towards biotic homogenization at the Carajás region in the future. Decreases in taxonomic, functional, and phylogenetic bee species richness due to homogenization (Harrison et al. 2018) will influence bee-plant interactions and plant distributions may also be strongly affected by pollinator range shifts (Rafferty 2017). Another concern regarding plants includes the fact that they are also susceptible to climatic variation pressures, and tree compositional shift followed by a more dry-affiliated flora has already been documented in the Amazon (Esquivel-Muelbert et al. 2018). However, the lack of up-to-date literature on wild bee-plant interactions both in the Amazon biome and in our study region poses an urgent need for studies on pollination syndromes (Rosas-Guerrero et al. 2014), on bee-plant interaction networks (Schleuning et al. 2015), and on provision of crop pollination services (Giannini et al. 2017).
Crop production is an important source of income in the municipalities surrounding Carajás, and the annual value of pollinator-dependent crops for these municipalities is estimated as being almost US$17 million in 2017 and the same in the 2018 (based on 14 crops listed in the IBGE website, Supplementary Information E) (data source: IBGE). Here we show that crop-pollinator bees will suffer a significantly higher loss of suitable occurrence area due to climate change. However, information on the interaction of local bees with those crops, their role in crop production, and the economic value of the pollination service provided by them is scarce. This lack of information highlights the need for basic knowledge and for developing conservation and crop management strategies (e.g., native species management) that consider sustainability of pollination services (Potts et al. 2016). Furthermore, data on animal pollinator dependence for regional crops is also scant (but see Giannini et al. 2015c), as well the annual production of crops not listed by the IBGE. Although we provide information on poorly known bee species distribution shifts here, the lack of complementary data makes it difficult to analyze an accurate impact of pollinator loss on regional agricultural production. Thus, the next steps for understanding the impact of bee losses in this area include to improve the knowledge about bee-plant interaction and local-crop production for which no information is available, mainly through field work.
Although our study provides evidence that some species will not find suitable habitats in the Carajás region, most of the species will find potential habitats in the northeast of Pará. To date, no other study has analyzed the impact of climate change on invertebrate species in this same area. However, other studies shown important suitable area reductions in the Amazon for vertebrates (Costa et al. 2018; Ribeiro et al. 2018; Miranda et al. 2019). All studies quoted showed a preponderance of future suitable habitats mainly in west and northeast of the state of Pará, which represents two important potential areas for conservation. Northeastern Pará is characterized by a higher annual volume of precipitation, when considering the state of Pará as a whole (Lopes et al. 2013), which is mainly associated with the intertropical convergence zone, a zone of maximum coverage of convective clouds interacting near the equatorial belt (Ferreira 1996). However, this area presents two distinct conditions in terms of land use. The westernmost portion corresponds to Marajó Island, a relatively well-preserved protected area, but habitats on the eastern portion corresponds to more degraded landscapes, inserted in the so-called arc of deforestation (Aldrich et al. 2012). This last area has the longest history of Amazon forest loss and retains only 24% of its original primary forest (Almeida and Vieira 2010). According to the IBGE, the municipalities of this area present low Human Development Index values (HDI—0.55 to 0.74) and the population reaches 1.4 million inhabitants in the capital alone. Particularly in this northeastern portion, restoration projects could be considered by stakeholders, mainly those projects that incorporate agroforestry production (IPCC 2007; Garibaldi et al. 2017), and also those that include native fauna management (e.g., beekeeping), which could help restoring ecosystem functions and services and also provide resources for low-income population in the region. Common bee species used in Pará State for beekeeping are mainly those pertaining to Meliponini tribe (stingless bees), such as, Melipona fasciculata, M. flavolineata, M. melanoventer, and M. seminigra. From these, our models suggest that only the first one (M. fasciculata) will find suitable habitats in Carajás. However, further studies could evaluate the effectiveness of other species for beekeeping.
The present study showed that the impact of climate change in Carajás would potentially severely reduce the number of bee species in the region, being significantly related to crop pollinators and species with more restricted distributional areas, with possible detrimental effects on biodiversity and agricultural production. Such impacts are of concern, especially in the absence of knowledge about species’ interactions, either with wild flora or with species of economic interest. Moreover, the Amazon biome is highly heterogeneous and will be impacted by climate change on different ways; thus, further studies addressing Western Amazon and/or other species are urgent. In this sense, the development of public policies that favor the creation and maintenance of research programs, and the protection and sustainable management of these species are important to guide conservation strategies supported by both public and private institutions.
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We thank CNPq for grants (446167/2015-0; 443254/2015-0; 381626/2016-4; 380846/2017-9).
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Orlando T. Silveira, Fernando A. Silveira, José E. Santos Júnior, Alessandro Lima, Beatriz W.T. Coelho, Kirstern L. F. Haseyama, Luciano Costa, Ulysses M. Madureira, Tiago Mahlman, Marcio Oliveira, Letícia Guimarães, and Alexandre Castilho for access on entomological collections and data, and for bee taxonomy. Alistair J. Campbell for suggestions on the manuscript. Andre L. Acosta, Rafael M. Brito, and Fernanda Trancoso for helping on maps and photos.
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Giannini, T.C., Costa, W.F., Borges, R.C. et al. Climate change in the Eastern Amazon: crop-pollinator and occurrence-restricted bees are potentially more affected. Reg Environ Change 20, 9 (2020). https://doi.org/10.1007/s10113-020-01611-y
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DOI: https://doi.org/10.1007/s10113-020-01611-y