Insecticiden

Throughout North America, many species of aerial insectivorous birds have exhibited steep declines. The timing of these declines coincides with changes in agriculture, perhaps signaling a causal link. Increased agrochemical use, wetland drainage, and cropping intensity may indirectly influence insectivores by reducing the abundance of insect prey. Our objective was to determine whether changes in insect abundance and biomass on agricultural landscapes in the Canadian Prairies influence the foraging behaviour of breeding Tree Swallows (Tachycineta bicolor (Vieillot, 1808)).

The butterfly fauna of lowland Northern California has exhibited a marked decline in recent years that previous studies have attributed in part to altered climatic conditions and changes in land use. Here we ask if a shift in insecticide use towards neonicotinoids is associated with butterfly declines at four sites in the region that have been monitored for four decades. A negative association between butterfly populations and increasing neonicotinoid application is detectable while controlling for land use and other factors, and appears to be more severe for smaller-bodied species.

The rusty patched bumble bee population has finally reached endangered levels. On Wednesday, the U.S. Fish and Wildlife Service proposed the bees be classified as an endangered species—the first wild bee species in the continental U.S. to be formally recommended for federal protection under the U.S. Endangered Species Act, according to Reuters. The bees, scientifically known as Bombus affinis, are nicknamed for the red blotch on their abdomen.

Bäche und kleine Flüsse in Landwirtschaftsgebieten sind massiv mit Giftstoffen aus der Landwirtschaft belastet. Dies zeigte ein Bericht des Gewässerforschungsinstituts EAWAG. Die Konsequenzen sind dramatisch: Eine kurze massive Erhöhung von Giftstoffen im Wasser während der Spritzzeit der Kulturen kann eine ganze Generation von Insektenlarven eines Jahres auslöschen. Das ist deshalb bedenklich, weil sich in solchen Gewässern viele Larven von Insekten entwickeln: etwa Eintagsfliegen, Mücken oder Libellen.

I miss seeing the back end of a bug. This summer I sensed a disturbance of some sort. There were hardly any ladybirds, almost no butterflies (only the odd cabbage white) and barely a wasp. Very, very odd. I noticed early on that the orchard would crop moderately (as opposed to well); I put this down to the slow spring and accompanying lack of pollinators.

Some birds pop up when you least expect it. On August bank holiday I went for a walk to my coastal patch, along with assorted relatives and a very boisterous dog. Bird-wise, apart from a high-tide roost of a thousand redshanks along the river Brue, things were relatively uneventful. But as we were strolling back to the car, a small bird flew up onto a protruding twig along a hedgerow, and posed in a way that made its identity virtually certain. A glance through my binoculars confirmed that it was indeed a whinchat (Saxicola rubetra).

North America has more than a billion fewer birds than it did 40 years ago, with the snowy owl and the chimney swift just two of the better-known species in dramatic decline across the continent, a recent survey has found. The total number of continental landbirds stands at about 10 billion, down from about 11.5 billion in 1970. The study’s authors – a range of academic, activist and government bodies in Canada and the United States – list 86 of North America’s roughly 450 breeding species as vulnerable, with some populations expected to be halved in a matter of decades.

Der Bund für Umwelt und Naturschutz Deutschland (BUND) sieht in der Übernahme von Monsanto durch Bayer enorme Risiken für Umwelt, Verbraucher und die bäuerliche Landwirtschaft. "Sollten die Kartellbehörden die Fusion durchwinken, würde der neu entstehende Megakonzern eine marktbeherrschende Stellung im Bereich Saatgut, Gentechnik und Pestizide bekommen. Damit würde auch sein politischer Einfluss auf die Gesetzgebung steigen. Der Konzern würde künftig verstärkt diktieren wollen, was Landwirte anbauen und welche Produkte auf dem Markt verfügbar sind.

When I started with Save Our Seine, I was surprised by an unusual topic on every board agenda: "Things we have learned from nature." With recent news about mosquitoes, malathion, and the cosmetic use of herbicides, I would like to share things I learned from nature in 1981 that had a profound impact on me. Manitoba was in the midst of an outbreak of western equine encephalitis (WEE). Like West Nile virus, WEE is spread by infected mosquitoes. A DC-6 aircraft was brought in to quickly blanket the city with Baygon to reduce the mosquito population.

Butterflies have joined the ranks of honeybees, bumblebees, moths and other insects that may be feeling the effects of the controversial neonicitinoid insecticides. UK researchers have found that even insects which do not pollinate oilseed rape may be harmed by the chemicals. Neonicotinoids - or neonics for short - are insecticides similar to nicotine, acting on the central nervous system to paralyse insects. One of them, imidacloprid, is the most widely used insecticide in the world.