Archive for the tag 'Nature'

El insecticida que mata las abejas también acaba con los pájaros.

Andrés Rodríguez González Julio 13th, 2014

El  insecticida que mata las abejas también acaba con los pájaros.

Según la publicación de la prestigiosa revista Nature, remitida por el investigador Rafael Obregon de la UCO.

Desde hace algún tiempo se sabía esto y podíamos apreciarlo a los que pasamos año tras año temporadas de campo largas.

Más sobre neonicotinoides, en este trabajo de Nature se analiza el declive de las aves insectívoras en relación al uso de neonicotinoides.

Resumen en Inglés

Declines in insectivorous birds are associated with high neonicotinoid concentrations

Caspar A. Hallmann,

Ruud P. B. Foppen,

Chris A. M. van Turnhout,

Hans de Kroon

Eelke Jongejans

Nature  04 March 2014

Recent studies have shown that neonicotinoid insecticides have adverse effects on non-target invertebrate species1, 2, 3, 4, 5, 6. Invertebrates constitute a substantial part of the diet of many bird species during the breeding season and are indispensable for raising offspring7. We investigated the hypothesis that the most widely used neonicotinoid insecticide, imidacloprid, has a negative impact on insectivorous bird populations. Here we show that, in the Netherlands, local population trends were significantly more negative in areas with higher surface-water concentrations of imidacloprid. At imidacloprid concentrations of more than 20 nanograms per litre, bird populations tended to decline by 3.5 per cent on average annually. Additional analyses revealed that this spatial pattern of decline appeared only after the introduction of imidacloprid to the Netherlands, in the mid-1990s. We further show that the recent negative relationship remains after correcting for spatial differences in land-use changes that are known to affect bird populations in farmland. Our results suggest that the impact of neonicotinoids on the natural environment is even more substantial than has recently been reported and is reminiscent of the effects of persistent insecticides in the past. Future legislation should take into account the potential cascading effects of neonicotinoids on ecosystems.