02377nas a2200169   4500008004100000245013400041210006900175260000800244300001200252490000700264520179900271100002202070700002202092700002102114700002302135856004902158       2007                        eng d00aEffective population sizes and migration rates in fragmented populations of an endangered insect (Coenagrion mercuriale: Odonata)0 aEffective population sizes and migration rates in fragmented pop  cJul  a790-8000 v763 a1. Effective population sizes (N(e)) and migration rates (m) are critical evolutionary parameters that impact on population survival and determine the relative influence of selection and genetic drift. While the parameter m is well-studied in animal populations, N(e) remains challenging to measure and consequently is only rarely estimated, particularly in insect taxa. 2. We used demographic and genetic methods to estimate N(e) and m in a fragmented population of the endangered damselfly Coenagrion mercuriale to better understand the contrast between genetic and field estimates of these parameters and also to identify the spatial scale over which populations may become locally adapted. 3. We found a contrast between demographic- and genetic-based estimates of these parameters, with the former apparently providing overestimates of N(e), owing to substantial underestimation of the variance in reproductive success, and the latter overestimating m, because spatial genetic structure is weak. 4. The overall N(e) of sites within the population network at Beaulieu Heath, the largest C. mercuriale site in the UK, was estimated to vary between approximately 60 and 2700. 5. While N(e) was not correlated with either the total numbers of adults (N) or the area of habitat, this parameter was always less than N, because of substantial variance in reproductive success. The ratio N(e)/N varied between 0.006 and 0.42 and was generally larger in smaller populations, possibly representing some 'genetic compensation'. 6. From a simple genetic model and these data on N(e) and m, it seems that populations of C. mercuriale have the potential to respond to localized spatial variation in selection and this would need to be considered for future genetic management of this endangered species.1 aWatts, Phillip, C1 aSaccheri, Ilik, J1 aKemp, Stephen, J1 aThompson, David, J  uhttps://worldodonata.myspecies.info/node/23802294nas a2200193   4500008004100000245019800041210006900239260000800308300001100316490000700327520157900334100002201913700002801935700002201963700002201985700002102007700002302028856004902051       2007                        eng d00aCompatible genetic and ecological estimates of dispersal rates in insect (Coenagrion mercuriale: Odonata: Zygoptera) populations: analysis of 'neighbourhood size' using a more precise estimator0 aCompatible genetic and ecological estimates of dispersal rates i  cFeb  a737-510 v163 aGenetic and demographic estimates of dispersal are often thought to be inconsistent. In this study, we use the damselfly Coenagrion mercuriale (Odonata: Zygoptera) as a model to evaluate directly the relationship between estimates of dispersal rate measured during capture-mark-recapture fieldwork with those made from the spatial pattern of genetic markers in linear and two-dimensional habitats. We estimate the 'neighbourhood size' (Nb) - the product of the mean axial dispersal rate between parent and offspring and the population density - by a previously described technique, here called the regression method. Because C. mercuriale is less philopatric than species investigated previously by the regression method we evaluate a refined estimator that may be more applicable for relatively mobile species. Results from simulations and empirical data sets reveal that the new estimator performs better under most situations, except when dispersal is very localized relative to population density. Analysis of the C. mercuriale data extends previous results which demonstrated that demographic and genetic estimates of Nb by the regression method are equivalent to within a factor of two at local scales where genetic estimates are less affected by habitat heterogeneity, stochastic processes and/or differential selective regimes. The corollary is that with a little insight into a species' ecology the pattern of spatial genetic structure provides quantitative information on dispersal rates and/or population densities that has real value for conservation management.1 aWatts, Phillip, C1 aRousset, Fran{\c, c}ois1 aSaccheri, Ilik, J1 aLeblois, Raphaël1 aKemp, Stephen, J1 aThompson, David, J  uhttps://worldodonata.myspecies.info/node/24001405nas a2200133   4500008004100000245010900041210006900150260000800219520092800227100002501155700002301180700001901203856004901222       2008                        eng d00aThe impact of climate-induced distributional changes on the validity of biological water quality metrics0 aimpact of climateinduced distributional changes on the validity   cDec3 aWe present data on the distributional changes within an order of macroinvertebrates used in biological water quality monitoring. The British Odonata (dragonflies and damselflies) have been shown to be expanding their range northwards and this could potentially affect the use of water quality metrics. The results show that the families of Odonata that are used in monitoring are shifting their ranges poleward and that species richness is increasing through time at most UK latitudes. These past distributional shifts have had negligible effects on water quality indicators. However, variation in Odonata species richness (particularly in species-poor regions) has a significant effect on water quality metrics. We conclude with a brief review of current and predicted responses of aquatic macroinvertebrates to environmental warming and maintain that caution is warranted in the use of such dynamic biological indicators.1 aHassall, Christopher1 aThompson, David, J1 aHarvey, Ian, F  uhttps://worldodonata.myspecies.info/node/224