tailieunhanh - Reproductive maturation and senescence in the female brown bear

Environmental toxins, including exposure to lead, pesticides, and other chemicals, unquestionably affect fertility in men and women. Researchers have documented many examples, the strongest cases involving industrial and occupational exposures. These usually involve small numbers of people exposed to high levels of contamination. Links between infertility and everyday low-level exposure to toxins have been harder to document, but people are regularly exposed to toxins from pesticides (crop dusting), household products (baby bottles, children’s toys, cleaners, cosmetics), and industrial production (including smoke). One study found that infertile women were 27 times more likely to have handled herbicides in the. | Reproductive maturation and senescence in the female brown bear Charles c. Schwartz1 17 Kim A. Keating 2 18 Harry V. Reynolds III3 19 Victor G. Barnes 20 Richard A. Sellers5 21 Jon E. Swenson6 22 sterling D. Miller7 23 Bruce N. McLellan8 24 Jeff Keay9 25 Robert McCann10 26 Michael Gibeau11 27 Wayne F. Wakkinen12 28 Richard D. Mace13 29 Wayne Kasworm14 30 Rodger Smith15 31 and Steven Herrero16 32 interagency Grizzly Bear study Team . Geological Survey Biological Resources Division Montana state University Bozeman Montana 59717 USA . Geological Survey Biological Resources Division Northern Rocky Mountain Science Center Montana state University Bozeman Montana 59717 USA 3Alaska Department of Fish and Game 1300 College Road Fairbanks Alaska 99701 USA . Geological Survey Biological Resources Division 1390 Buskin River Road Kodiak Alaska 99615 USA 5Alaska Department of Fish and Game . Box 37 King Salmon Alaska 99613 USA 6Department of Biology and Nature Conservation Agricultural University of Norway Box 5014 N-1432 Ảs Norway 7Alaska Department of Fish and Game 333 Raspberry Road Anchorage Alaska 99513 USA 8 British Columbia Ministry of Forests Research Branch RPO 3 Box 9158 Revelstoke British Columbia VOE 3K0 Canada . Box 9 Denali National Park Alaska USA 10 Centre for Applied Conservation Research Forest Sciences Centre University of British Columbia 3004-2424 Main Mall Vancouver British Columbia V6T 1Z4 Canada 11 Parks Canada Banff National Park Box 900 Banff Alberta TOL oco Canada 12Idaho Department of Fish and Game HCR 85 Box 323J Bonners Ferry Idaho 83805 USA Montana Department of Fish Wildlife and Parks 490 North Meridian Road Kalispell Montana 59901 USA . Fish and Wildlife Service 475 Fish Hatchery Road Libby Montana 59923 USA 15Alaska Department of Fish and Game 211 Mission Road Kodiak Alaska 99615 USA Environmental Science Faculty of Environmental Design The University of Calgary Calgary Alberta T2N 1N4 Canada Abstract Changes in .