The global stock of domesticated honey bees is growing slower than agricultural demand for pollination.
The prospect that a global pollination crisis currently threatens agricultural productivity has drawn intense recent interest among scientists, politicians, and the general public. To date, evidence for a global crisis has been drawn from regional or local declines in pollinators themselves or insufficient pollination for particular crops. In contrast, our analysis of Food and Agriculture Organization (FAO) data reveals that the global population of managed honey-bee hives has increased approximately 45% during the last half century and suggests that economic globalization, rather than biological factors, drives both the dynamics of the global managed honey-bee population and increasing demands for agricultural pollination services. Nevertheless, available data also reveal a much more rapid (>300%) increase in the fraction of agriculture that depends on animal pollination during the last half century, which may be stressing global pollination capacity. Although the primary cause of the accelerating increase of the pollinator dependence of commercial agriculture seems to be economic and political and not biological, the rapid expansion of cultivation of many pollinator-dependent crops has the potential to trigger future pollination problems for both these crops and native species in neighboring areas. Such environmental costs merit consideration during the development of agriculture and conservation policies.
Laboratorio Ecotono, INIBIOMA-CONICET and Centro Regional Bariloche, Universidad Nacional del Comahue, Quintral 1250, 8400 Bariloche, Río Negro, Argentina. marcelo.aizen@crub.uncoma.edu.ar
Marcelo A
MA
Aizen
Lawrence D
LD
Harder
D000383:Agriculture; D000822:Animal Husbandry; D000818:Animals; D001516:Bees / Q000254:growth & development*; D003247:Conservation of Natural Resources; D006801:Humans; D054817:Pollination; D011156:Population Density