Worldwide occurrence records suggest a global decline in bee species richness

Zattara, Eduardo E.; Aizen, Marcelo A.

doi:10.1016/j.oneear.2020.12.005

Cited by 339 publications

(197 citation statements)

References 61 publications

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“…Concern about declining bee populations (Cameron et al., 2011; Potts et al., 2010; Zattara & Aizen, 2021) has led to increased use of bee sampling and monitoring protocols using pan (i.e. bowl) traps (LeBuhn et al., 2013; Westphal et al., 2008).…”

Section: Introductionmentioning

confidence: 99%

Relative bee abundance varies by collection method and flowering richness: Implications for understanding patterns in bee community data

Kuhlman

Burrows

Mummey

et al. 2021

Ecol Sol and Evidence

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1. Recent declines in wild bee populations have led to increases in conservation actions and monitoring of bee communities. Pan traps are a commonly used sampling method for monitoring bee populations due to their efficiency and low cost.However, potential biases inherent in different sampling techniques may result in misleading characterizations of bee communities across space and time.2. In this paper, we examined how bee communities sampled using pan traps and aerial nets changed seasonally, and if they were affected by the availability of floral resources.3. We found strong seasonal changes in the abundance, but not the richness, of bees captured in pan traps. Notably, we captured the fewest bees during weeks in spring when most flowering plant species were in bloom, suggesting that floral resource availability influences pan trap captures. We also compared patterns of bee abundance in pan traps to those captured by aerial netting. Bee richness in pans and nets was positively correlated, but relative abundances in pan and net samples were dominated by different bee genera. Furthermore, most genera decreased in pans with increasing floral richness, but patterns were mixed for nets. When using presence/absence data, rather than abundance, community composition was more similar between netted and pan-trapped bee communities and changed less substantially across the floral richness gradient. 4. Overall, these differences led to sampling substantially different bee community compositions in pan traps versus nets, especially when using abundance-based methods to characterize the bee community. By examining multiple years of intensive seasonal sampling of plant and bee communities, we document potential pitfalls with methods commonly used to sample bee communities.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Introductionmentioning

confidence: 99%

Relative bee abundance varies by collection method and flowering richness: Implications for understanding patterns in bee community data

Kuhlman

Burrows

Mummey

et al. 2021

Ecol Sol and Evidence

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“…France, Netherlands, United Kingdom and Norway (Christmann, 2019c;Dicks et al, 2016a). The European Union invests billions to subsidize AES (Batáry et al, 2015;De Snoo et al, 2013;McCracken et al, 2015), but even in countries paying farmers for seeding wildflower strips (WFS) for decades, the decline of pollinators progresses (Biesmeijer et al, 2006;Carvalheiro et al, 2013;EU, 2020;Hallmann et al, 2017;Powney et al, 2019;Zattara & Aizen, 2021). Farmers dislike even paid WFS (Kleijn et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Two enabling factors for farmer-driven pollinator protection in low- and middle-income countries

Christmann¹,

Aw‐Hassan²,

Güler

et al. 2021

International Journal of Agricultural Sustainability

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Reward-based wildflower strips are the most common approach for pollinator protection in high-income countries. Low-and middle-income countries cannot afford this practice. A promising pilot study in Uzbekistan introduced an alternative approach, Farming with Alternative Pollinators, focusing on farmers as target group, marketable habitat enhancement plants and a method-inherent incentive: higher income per surface achieved already in the first year. We hypothesized that higher income would be a replicable enabling factor across continents, but a knowledge-raising campaign would be necessary in many low-and middle-income countries. We assessed the replicability of the incentive with a small number of farmers in 2015-2016 in Morocco but focused on assessing if farmers have sufficient knowledge to recognize wild pollinators and use this approach. We conducted 766 interviews using a standardized questionnaire with randomly selected smallholder farmers in three culturally different farming societies of lowand middle-income countries (Morocco, Turkey and Benin). Farming with Alternative Pollinators induced higher income (75% (2015), 177% (2016)) also in Morocco. The trial and the survey show the indispensability of a knowledge-raising campaign as the second enabling factor. However, based on capacity building, Farming with Alternative Pollinators could have indeed high potential to promote pollinator protection in low-and middle-income countries.

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“…Despite their importance, bee diversity has been decreasing (Potts et al 2010). One of the main factors responsible for this decline is land use modification, including urbanization (Harrison et al 2017;Millard et al 2021;Zattara and Aizen 2021). However, some characteristics of the urban environment and the biology of bees allow some species to thrive in cities (Hennig and Ghazoul 2011;Hall et al 2017).…”

Section: Insects (Bees)mentioning

confidence: 99%

A global review of urban pollinators and implications for maintaining pollination services in tropical cities

Maruyama¹,

Silva²,

Gomes³

et al. 2021

Preprint

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Pollinators provide essential ecosystem services worldwide, but dependence on biotic pollination is higher in the tropics, where urbanization is expected to impact biodiversity more severely. Here, we present a global review on urban pollinator studies with emphasis on the tropics. From the 308 published studies that included information on pollinator groups, only ~25 % were conducted in tropical regions, while ~65 % were carried out in the non-tropical northern hemisphere. This overall trend was similar for all the major insect pollinator groups, but not for vertebrates, which were overall less studied in both tropical and non-tropical regions. The effects of urbanization on tropical pollinators are diverse and complex and likely depend on the extent and type of urbanization, as well as the pollinator taxa studied. For both insect and vertebrate pollinators, the existing studies suggest that tropical cities can support generalist species tolerant of human activity, but the lack of studies hampers other general conclusions. The underrepresentation of pollinator studies in tropical cities undermines the value of urban biodiversity conservation in the most biodiverse regions of the world and highlights a missing opportunity. Since promoting urban biodiversity benefits both nature and people, it could be especially relevant in the Global South, where economic and social inequalities are severe and pollinator conservation may contribute to sustainability goals. In this context, initiatives that foster more international collaborations and research in the tropics are essential for a better understanding of the effects of urbanization and the value of pollinators in urban areas. Such knowledge can provide the basis for better urban planning strategies that contribute to the conservation of biodiversity and maintenance of pollination services in tropical cities.

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Worldwide occurrence records suggest a global decline in bee species richness

Cited by 339 publications

References 61 publications

Relative bee abundance varies by collection method and flowering richness: Implications for understanding patterns in bee community data

Relative bee abundance varies by collection method and flowering richness: Implications for understanding patterns in bee community data

Two enabling factors for farmer-driven pollinator protection in low- and middle-income countries

A global review of urban pollinators and implications for maintaining pollination services in tropical cities

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