Peter Borgen Sørensen

TY - RPRT

T1 - Pilotprojekt: Insekticiders effekt på de terrestriske stadier af vandinsekter

T2 - en overset faktor af betydning for makroinvertebratsamfundene i danske vandløb?

AU - Strandberg, Morten Tune

AU - Wiberg-Larsen, Peter

AU - Bruus, Marianne

AU - Strandberg, Beate

AU - Sørensen, Peter Borgen

AU - Larsen, Søren Erik

AU - Rasmussen, Jes Jessen

PY - 2020

Y1 - 2020

N2 - Many taxonomic groups of freshwater insects, such as caddisflies, stoneflies, mayflies, dragonflies and damselflies, have a reproductive terrestrial life stage. Some of these are known tobe extremely sensitive to insecticides in the aquatic environment. However, their sensitivityduring the terrestrial adult stage, when they also reproduce, is literally unknown. Consequently, it is also unknown to which extent they are exposed to pesticides during the adultstage and what effects this may have on population size and structure, both in the short andlong term. So far, risk assessment and management have only focused on avoiding risks toinsect macroinvertebrates in the aquatic environment, and exposure during the terrestrialstage has been completely neglected. Possible cascading effects on food webs, including effects on fish and birds, also lack in the risk assessment, regardless of whether these resultfrom pesticide remnants in exposed food or from reduced food sources.The main objective of the present pilot project has been to investigate whether adult stages ofaquatic insects are sensitive to two insecticides tested in the lab and, if so, to calculate to whatextent realistic exposure may lead to population level effects. The project does not include anyfield measurements or investigations of cascade effects on food webs.For the purpose of investigations, we chose to study the effects of two insecticides on the terrestrial stage of six aquatic insects. The two insecticides were Karate and Confidor, with theactive ingredients lambda-cyhalothrin and imidacloprid, respectively. Listed in Table 4 are thespecies we succeeded doing experiments with. Table 4 also gives a summary of experimentscarried out.

AB - Many taxonomic groups of freshwater insects, such as caddisflies, stoneflies, mayflies, dragonflies and damselflies, have a reproductive terrestrial life stage. Some of these are known tobe extremely sensitive to insecticides in the aquatic environment. However, their sensitivityduring the terrestrial adult stage, when they also reproduce, is literally unknown. Consequently, it is also unknown to which extent they are exposed to pesticides during the adultstage and what effects this may have on population size and structure, both in the short andlong term. So far, risk assessment and management have only focused on avoiding risks toinsect macroinvertebrates in the aquatic environment, and exposure during the terrestrialstage has been completely neglected. Possible cascading effects on food webs, including effects on fish and birds, also lack in the risk assessment, regardless of whether these resultfrom pesticide remnants in exposed food or from reduced food sources.The main objective of the present pilot project has been to investigate whether adult stages ofaquatic insects are sensitive to two insecticides tested in the lab and, if so, to calculate to whatextent realistic exposure may lead to population level effects. The project does not include anyfield measurements or investigations of cascade effects on food webs.For the purpose of investigations, we chose to study the effects of two insecticides on the terrestrial stage of six aquatic insects. The two insecticides were Karate and Confidor, with theactive ingredients lambda-cyhalothrin and imidacloprid, respectively. Listed in Table 4 are thespecies we succeeded doing experiments with. Table 4 also gives a summary of experimentscarried out.

M3 - Rapport

SN - 978-87-7038-117-8

T3 - Bekæmpelsesmiddelforskning

BT - Pilotprojekt: Insekticiders effekt på de terrestriske stadier af vandinsekter

PB - Miljøministeriet, Miljøstyrelsen

ER -