Are arthropods in decline and does it matter?
關鍵詞：population continues nonetheless quelea
摘要：The world population continues to grow, although there are signs that the trend is slowing, and the human population may actually be facing a decline (Bricker & Ibbitson,2019). Nonetheless, the human impact is now so large that it threatens numerous other species. Recent assessments of the state of the natural world underlines that extinctions are not the only relevant criterion to indicate that the human race harms other beings: since 1970, the populations of an estimated 10,000 species of vertebrates declined by over half (WWF,2014). Another striking example of human influence on the living world is on bird abundance. Domesticated chicken ( Gallus gallus domesticus ) is today the world′s most numerous bird with a standing population of 22.7 billion (FAO,2018), which is an order of magnitude greater than the standing stock of the most abundant wild bird species, the red-billed quelea ( Quelea quelea ) at approximately 1.5 billion (Craig,2010).
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