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  • Grassland bird population declined 70 per cent in past 50 years
    Grassland birds are the most threatened populations of birds in Canada, with a 67 per cent decline since 1970, a report published Tuesday found — but a surprising alliance with beef producers is
  • Environmental Biology 105, Exam #2 Flashcards - Quizlet
    Biomagnification of DDT caused populations of many North American birds of prey to decline precipitously from the 1950s to the 1970s The peregrine falcon was nearly wiped out in the eastern United States, and the bald eagle, the U S national bird, was virtually eliminated from the lower 48 states
  • BIODIVERSITY LOSS Decline of the North American avifauna - AAAS
    breeding individuals across 31 species—and the largest proportional loss (53%); 74% of grassland species are declining (Fig 1 and Table 1) All forest biomes experienced large avian loss, with a cumulative reduction of more than 1 billion birds Wetland birds represent the only biome to show an overall net gain in numbers (13%), led by a 56
  • Climate change threatens nearly 400 North American bird species
    To assess the danger that climate change poses to 604 of North America’s bird species (out of an estimated 800 to 900), the National Audubon Society collated more than 140 million records from
  • Global elevational diversity and diversification of birds
    A global study of all bird species in mountainous areas shows that richness decreases predictably with elevation, whereas diversification rates increase Next to the latitudinal biodiversity
  • Global climate change and mammalian species diversity in U. S . . .
    Species losses occurred in all taxonomic orders except Artiodactyla (hoofed mammals) Nearly half of the losses across all parks occurred in rodent species (44%) In addition, 22% of observed losses were Chiropteran species (bats), and 19% of all losses were carnivore species
  • Lights Are Flashing Red: Study Finds 69% Average Drop in . . .
    A sweeping report published Thursday by one of the world's largest conservation groups finds that Earth's vertebrate animal populations experienced an average decline of nearly 70% between 1970 and 2018, a staggering drop that experts attribute to the worsening climate crisis, pollution, the large-scale destruction of forests, and continued human exploitation of wildlife





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