Relevance of body weight effects for the population development of common voles and its significance in regulatory risk assessment of pesticides in the European Union

• Main Authors: Wang, Magnus, Ebeling, Markus, Hahne, Jörg
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: figshare 2019
• Subjects: Physiology; FOS Biological sciences; 59999 Environmental Sciences not elsewhere classified; FOS Earth and related environmental sciences; Ecology; 69999 Biological Sciences not elsewhere classified; Common vole; Microtus arvalis
• Online Access: https://dx.doi.org/10.6084/m9.figshare.c.4661702; https://springernature.figshare.com/collections/Relevance_of_body_weight_effects_for_the_population_development_of_common_voles_and_its_significance_in_regulatory_risk_assessment_of_pesticides_in_the_European_Union/4661702

Abstract Background The common vole (Microtus arvalis) is typically the wild mammal species driving regulatory pesticide risk assessment (RA) in Europe. The risk assessment endpoint for wild mammals is taken from the studies conducted mainly with rodents for the toxicological part of the dossier. Body weight effects in these studies are often driving the selection of the No Observed Adverse Effect Level (NOAEL) used for wildlife risk assessment. Thus, assessing body weight effects in voles very frequently constitutes a key scenario in the RA. Although many studies on ecology, reproductive biology, population genetics, and other aspects of common voles are available, the relevance of body weight for their survival and reproduction has not yet been specifically analysed. There is also little guidance on how to quantitatively deal with body weight effects in the regulatory risk assessment of pesticides. Results We evaluated the population relevance of body weight effects on voles by analysis of a dataset from a multi-annual study with repeated life-trapping and genotyping, and have correlated body weight with reproductive success, taking account of the seasonality of body weight. Body weight and growth were similar between reproducing and non-reproducing females. The number of confirmed offspring indicated no correlation with parental body weight. Reproductive success of the voles was mainly influenced by the date of birth, i.e., animals born in spring have a higher chance to reproduce. Body weight did not correlate with life span during most of the year, except for autumn. Animals weighing