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  • Plant-based insect repellents: a review of their efficacy . . .
    The exception to this is para-menthane 3, 8 diol, which has a lower vapour pressure than volatile monoterpines found in most plant oils and provides very high protection from a broad range of insect vectors over several hours , whereas the essential oil is repellent for around one hour PMD is the only plant-based repellent that has been
  • Colony collapse disorder - Wikipedia
    The National Agricultural Statistics Service (NASS) reported 2 44 million honey-producing hives were in the United States in February 2008, down from 4 5 million in 1980, and 5 9 million in 1947, though these numbers underestimate the total number of managed hives, as they exclude several thousand hives managed for pollination contracts only
  • Plant diversity in a changing world: Status, trends, and . . .
    This compares with around 10,000 bird species and 5400 mammals Indeed, the only taxonomic groups whose diversities are thought to substantially exceed that of land plants are the largely plant-dependent fungi (1 5–5 1 m; Hawksworth, 2012) and beetles (ca 1 5 m; Stork et al , 2015)
  • The unknown giants of the deep oceans - BBC
    Finding the 1 75 million or so missing species is becoming an increasingly pressing mission – especially in the deepest ocean floors, as the prospect of commercial deep-sea mining becomes
  • Ancient fossils lead to discovery of largest known marine . . .
    Since then, fossils belonging to more than 100 species of ichthyosaurs have been identified around the world An illustration depicts a washed-up Ichthyotitan severnensis carcass on the beach
  • Red fox | Established pest animal species | Pest animals . . .
    The economic impact of foxes in Australia has been estimated at around $227 5 million per annum This includes: $17 5 million in sheep production losses $190 million in environmental impacts $16 million in management costs $4 million in research costs
  • News, sport and opinion from the Guardians US edition | The . . .
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