Researchers discover pesticidefree way to limit mosquitoes and reduce spread of West

first_imgJun 19 2018Researchers at the University of Waterloo may have discovered a new, pesticide-free way to limit mosquito populations in some area and reduce the spread of the West Nile virus.Waterloo researcher Brad Fedy discovered that introducing hungry minnows into bodies of water where mosquitoes breed results in the minnows feeding on mosquito larvae, which dramatically decreases the number of adult mosquitoes capable of carrying the disease.“The best strategies to limit mosquitoes start at the larval stage. Unfortunately, in North America, control efforts are largely limited to larvicides, which require a repeated application and have potentially negative ecological impacts,” said Fedy. “Addressing the problem with minnows provides many benefits in that it is low-maintenance, cost-effective, better for the environment in many cases, and our health.”Related StoriesResearchers succeed in conquering chronic infection with hepatitis B virusStudy reveals how dengue virus replicates in infected cellsCommon cold virus strain could be a breakthrough in bladder cancer treatmentThe study took place over three years and introduced minnows into ten treatment reservoirs. Researchers monitored an additional six non-treated reservoirs.Treatment ponds demonstrated suppressed levels of mosquito larva over each season compared to controls with a model-predicted 114 per cent decrease in larva density within treatment ponds.“There are many potential advantages to using indigenous fish species as an alternative for larval control including lowered environmental impact, decreased costs regarding time and financial inputs, and the potential for the establishment of self-sustaining fish populations,” said Fedy. “This isn’t a complete solution to the dangers of West Nile, but it should be considered as part of any plan to protect the health of vulnerable populations.”Fedy and his team discovered the method while researching sage grouse populations in the intermountain west. Sage grouse populations suffer adverse impacts from mosquitoes transferring viruses like West Nile and investigated ways to mitigate those negative impacts. What they discovered could also improve human health.Source: read more

Neanderthals may not have been the headbangers scientists once assumed

first_img Click to view the privacy policy. Required fields are indicated by an asterisk (*) By Colin BarrasNov. 14, 2018 , 1:00 PM Email However, young Neanderthals did seem to have proportionally more smacks on the head: Of the 14 Neanderthal bones with injuries, nine came from individuals under 30 years old, whereas only seven of the 25 modern human bones with injuries came from such young individuals. So, it’s possible that young Neanderthals took more risks than young members of our own species. Sign up for our daily newsletter Get more great content like this delivered right to you! Country Country * Afghanistan Aland Islands Albania Algeria Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia, Plurinational State of Bonaire, Sint Eustatius and Saba Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory Brunei Darussalam Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo Congo, the Democratic Republic of the Cook Islands Costa Rica Cote d’Ivoire Croatia Cuba Curaçao Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falkland Islands (Malvinas) Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Holy See (Vatican City State) Honduras Hungary Iceland India Indonesia Iran, Islamic Republic of Iraq Ireland Isle of Man Israel Italy Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Korea, Democratic People’s Republic of Korea, Republic of Kuwait Kyrgyzstan Lao People’s Democratic Republic Latvia Lebanon Lesotho Liberia Libyan Arab Jamahiriya Liechtenstein Lithuania Luxembourg Macao Macedonia, the former Yugoslav Republic of Madagascar Malawi Malaysia Maldives Mali Malta Martinique Mauritania Mauritius Mayotte Mexico Moldova, Republic of Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island Norway Oman Pakistan Palestine Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Qatar Reunion Romania Russian Federation Rwanda Saint Barthélemy Saint Helena, Ascension and Tristan da Cunha Saint Kitts and Nevis Saint Lucia Saint Martin (French part) Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia Seychelles Sierra Leone Singapore Sint Maarten (Dutch part) Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia and the South Sandwich Islands South Sudan Spain Sri Lanka Sudan Suriname Svalbard and Jan Mayen Swaziland Sweden Switzerland Syrian Arab Republic Taiwan Tajikistan Tanzania, United Republic of Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United Kingdom United States Uruguay Uzbekistan Vanuatu Venezuela, Bolivarian Republic of Vietnam Virgin Islands, British Wallis and Futuna Western Sahara Yemen Zambia Zimbabwe Gleiver Prieto & Katerina Harvati Neanderthals are often depicted as graduates of the Stone Age school of hard knocks: Without sophisticated weapons, they had to face down violent prey such as woolly rhinos at close range (illustrated above)—and they should have the broken skulls to prove it. But a new study reveals our closest human relatives were no more likely than Stone Age members of our species to sustain head injuries.Researchers collated data from previous studies on 295 Neanderthal skull bones and 541 modern human skull bones from individuals who lived in Eurasia between 80,000 and 20,000 years ago. Just 39 of the skull bones—14 Neanderthal and 25 modern human—showed signs of injury such as lesions to the bone. That’s a 5% injury rate across the skull bones of both species, suggesting no real difference between the two, the team reports today in Nature.So how did Neanderthals stay safe? They may have killed prey by driving it into natural pit traps in the landscape, the authors say, or cooperated on hunts to reduce the chances of individuals sustaining injuries. Neanderthals may not have been the headbangers scientists once assumedlast_img read more