Immunosuppression response to thiacloprid in the red mason bee Osmia bicornis

Here we demonstrate for the frst time that field-realistic concentrations of the commonly used neonicotinoid insecticide thiacloprid can severely affect the immunocompetence of Osmia bicornis. In detail, males exposed to thiacloprid solutions of 200 and 555µg/kg showed a reduction in hemocyte density. Moreover, functional aspects of the immune defence - the antimicrobial activity of the hemolymph - were impaired in males. In females, however, only a concentration of 555µg/kg elicited similar immunosuppressive efects.

Henk Tennekes spiega le sue idee sul deragliamento della tossicologia

In un'intervista con i sottotitoli inglesi, il tossicologo Henk Tennekes spiega le sue idee sul deragliamento della tossicologia. È dell'opinione che, in particolare, la tossicità cumulativa dei pesticidi nell'ambiente durante la procedura di autorizzazione non sia sufficientemente studiata e quindi spiega la massiccia mortalità degli insetti negli ultimi anni.

Le toxicologue Henk Tennekes explique ses idées sur le déraillement de la toxicologie

Dans une interview avec des sous-titres anglais, le toxicologue Henk Tennekes explique ses idées sur le déraillement de la toxicologie. Il est d'avis que, notamment, la toxicité cumulée des pesticides dans l'environnement lors de la procédure d'autorisation n'est pas suffisamment étudiée et explique ainsi la mortalité massive des insectes ces dernières années.

The toxicologist Henk Tennekes on the derailment of toxicology

In an interview with English subtitles, the toxicologist Henk Tennekes explains his ideas about the derailment of toxicology. He is of the opinion that the cumulative toxicity of pesticides in the environment is not sufficiently investigated during the authorization procedure and explains the massive insect mortality in recent years.

Der Toxikologe Henk Tennekes: zur Entgleisung der Toxikologie

In einem Interview mit englischen Untertiteln erklärt der Toxikologe Henk Tennekes seine Ideen zur Entgleisung der Toxikologie. Er ist der Ansicht, dass insbesondere die kumulative Toxizität von Pestiziden in der Umwelt während des Zulassungsverfahrens nicht ausreichend untersucht wird, und erklärt damit die massive Insektensterblichkeit in den letzten Jahren.

Henk Tennekes over de ontsporing van de toxicologie

In een interview met Engelse ondertiteling zet de toxicoloog Henk Tennekes zijn denkbeelden over de ontsporing van de toxicologie uiteen. Hij is van mening dat met name de cumulatieve toxiciteit van bestrijdingsmiddelen in het milieu bij de toelatingsprocedure onvoldoende wordt onderzocht en verklaart daarmee de massale insectensterfte van de laatste jaren.

Shifts in food plant abundance for flower‐visiting insects between 1900 and 2017 in the canton of Zurich, Switzerland

We compared the current (2012–2017) abundances of food plants of different groups of flower‐visiting insects to that of 1900–1930 in the canton of Zurich, Switzerland. Comparisons were done separately for different vegetation types, flowering months, and groups of diurnal flower‐visiting insects, such as bees, bumblebees, wasps, butterflies, hoverflies, flies, and beetles. We found a general decrease in food plant abundance for all groups of flower‐visiting insects and in all vegetation types except ruderal areas.

A Review of Sub-lethal Neonicotinoid Insecticides Exposure and Effects on Pollinators

Beekeepers around the world have been reporting the ongoing weakening of honeybee health and subsequently the increasing colony losses since 1990. However, it was not until the abrupt emergence of colony collapse disorder (CCD) in the 2000s that has raised the concern of losing this important perennial pollinator. In this report, we provide a summary of the sub-lethal effects of pesticides, in particular of neonicotinoids, on pollinators’ health from papers published in peer-review journals.

Neonicotinoids can negatively affect immunocompetence in the red mason bee leading to impaired disease resistance capacity

Solitary bees are frequently exposed to pesticides, which are considered as one of the main stress factors that may lead to population declines. A strong immune defence is vital for the fitness of bees. However, the immune system can be weakened by environmental factors that may render bees more vulnerable to parasites and pathogens.