Scarcity of ecosystem services: an experimental manipulation of declining pollination rates and its economic consequences for agriculture.

PeerJ · 2016 · PMC4941739 · PMID 27441108

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an increasing trendno p-value reported

Globally, there has been an increasing trend in the cultivation of pollinator-dependent crops since 1961 ( Aizen & Harder, 2009 ; Gilbert, 2016 ; Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services, 2016 ).

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