Scientists noted the drop occurred regardless of the habitat type, but changes in weather, land use and habitat characteristic were not the reason.
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Despite the unknown explanation, researchers say the dip is “alarming” as the disappearance of “field margins and new crop protection” have both been associated with insect decline.
“Loss of insect diversity and abundance is expected to provoke cascading effects on food webs and to jeopardize ecosystem services,” the study read.
That’s why researchers hope to continue their studies to pinpoint the exact cause and ways to prevent it.
“There is an urgent need to uncover the causes of this decline,” the study said, “its geographical extent, and to understand the ramifications of the decline for ecosystems and ecosystem services.”