Invasive species management will benefit from social impact assessment

This is the author accepted manuscript. The final version is available from Wiley via the DOI in this record.Invasive species management aims to prevent or mitigate the impacts of introduced species but management interventions can themselves generate social impacts that must be understood and addressed. Established approaches for addressing the social implications of invasive species management can be limited in effectiveness and democratic legitimacy. More deliberative, participatory approaches are emerging that allow integration of a broader range of socio-political considerations. Nevertheless, there is a need to ensure that these are rigorous applications of social science. Social impact assessment offers a structured process of identifying, evaluating and addressing social costs and benefits. We highlight its potential value for enabling meaningful public participation in planning and as a key component of integrated assessments of management options. Policy implications. As invasive species management grows in scope and scale, social impact assessment provides a rigorous process for recognising and responding to social concerns. It could therefore produce more democratic, less conflict-prone and more effective interventions

Killing squirrels: Exploring motivations and practices of lethal wildlife management

This is the author accepted manuscript. The final version is available from Sage via the DOI in this record.Wildlife management, pest control and conservation projects often involve killing nonhuman animals. In the United Kingdom, introduced grey squirrels Sciurus carolinensis are killed in large numbers to protect remnant populations of European red squirrels Sciurus vulgaris. Grey squirrels are also killed outside of red squirrel areas to protect broadleaved trees from squirrel damage, and as part of routine pest control, opportunistically, and sometimes recreationally. In order to investigate the ways in which this killing is conceived and practised in the United Kingdom, we conducted semi-structured interviews with practitioners and undertook participant observation of squirrel management activities, including lethal control. Analysing these field data, we identified important variations in practitioners’ approaches to killing squirrels, and here we outline three ‘modes of killing’ – reparative/sacrificial, stewardship, and categorical – which comprise different primary motivations, moral principles, ultimate aims, and practical methods. We explore both productive alliances and possible tensions between these modes, and propose that clear, explicit consideration of how and why animals are both killed and ‘made killable’ should be a key component of any wildlife management initiative that involves lethal control.SLC was supported by a scholarship from the University of Exeter

Diverse perspectives of cat owners indicate barriers to and opportunities for managing cat predation of wildlife

This is the final version. Available on open access from Wiley via the DOI in this recordData availability: All quantitative data and additional information associated with this study have been deposited at www.zenodo.org and can be found at doi.org/10.5281/zenodo.3755683Policy proposals to address predation of wildlife by domestic cats (Felis catus) include reducing cat populations, regulating ownership, educating owners, and restricting cats’ outdoor access. Such proposals rarely account for cat owners’ perspectives, however, and are frequently met with strong, principled opposition. We conducted a Q‐methodological study to investigate the views of domestic cat owners in the UK on the roaming and hunting behaviors of their pets. We identified five distinctive cat‐owner perspectives: (1) Concerned Protectors focus on cat safety, (2) Freedom Defenders prioritize cat independence and oppose restrictions on behavior, (3) Tolerant Guardians believe outdoor access is important for cats but dislike their hunting, (4) Conscientious Caretakers feel some responsibility for managing their cats’ hunting, and (5) Laissez‐faire Landlords were largely unaware of the issues surrounding roaming and hunting behavior. Most participants valued outdoor access for cats and opposed confinement to prevent hunting; cat confinement policies are therefore unlikely to find support among owners in the UK. To address this conservation challenge, we argue that generic policies will be less effective than multidimensional strategies offering owners practical husbandry approaches that are compatible with their diverse circumstances, capabilities, and senses of responsibility

Invasiveness of plants is predicted by size and fecundity in the native range

This is the final version of the article. Available from Wiley via the DOI in this record.An important goal for invasive species research is to find key traits of species that predispose them to being invasive outside their native range. Comparative studies have revealed phenotypic and demographic traits that correlate with invasiveness among plants. However, all but a few previous studies have been performed in the invaded range, an approach which potentially conflates predictors of invasiveness with changes that happen during the invasion process itself. Here, we focus on wild plants in their native range to compare life-history traits of species known to be invasive elsewhere, with their exported but noninvasive relatives. Specifically, we test four hypotheses: that invasive plant species (1) are larger; (2) are more fecund; (3) exhibit higher fecundity for a given size; and (4) attempt to make seed more frequently, than their noninvasive relatives in the native range. We control for the effects of environment and phylogeny using sympatric congeneric or confamilial pairs in the native range. We find that invasive species are larger than noninvasive relatives. Greater size yields greater fecundity, but we also find that invasives are more fecund per-unit-size. SYNTHESIS: We provide the first multispecies, taxonomically controlled comparison of size, and fecundity of invasive versus noninvasive plants in their native range. We find that invasive species are bigger, and produce more seeds, even when we account for their differences in size. Our findings demonstrate that invasive plant species are likely to be invasive as a result of both greater size and constitutively higher fecundity. This suggests that size and fecundity, relative to related species, could be used to predict which plants should be quarantined.We thank the National Trust and Cornwall Wildlife Trust for access to field sites, Dr. Colin French for use of the ERICA database, and Luke Davis and Cheryl Mills for assistance during data collection. KJ was supported by the University of Exeter as part of its wildlife research partnership with DEFRA's National Wildlife Management Centre. DH was supported by the Natural Environment Research Council grant reference NE/L007770/1

Demographic buffering and compensatory recruitment promotes the persistence of disease in a wildlife population.

Published onlineLETTERDemographic buffering allows populations to persist by compensating for fluctuations in vital rates, including disease-induced mortality. Using long-term data on a badger (Meles meles Linnaeus, 1758) population naturally infected with Mycobacterium bovis, we built an integrated population model to quantify impacts of disease, density and environmental drivers on survival and recruitment. Badgers exhibit a slow life-history strategy, having high rates of adult survival with low variance, and low but variable rates of recruitment. Recruitment exhibited strong negative density-dependence, but was not influenced by disease, while adult survival was density independent but declined with increasing prevalence of diseased individuals. Given that reproductive success is not depressed by disease prevalence, density-dependent recruitment of cubs is likely to compensate for disease-induced mortality. This combination of slow life history and compensatory recruitment promotes the persistence of a naturally infected badger population and helps to explain the badger's role as a persistent reservoir of M. bovis.NERCUK Department of Environment, Food and Rural Affair

Density and abundance of badger social groups in England and Wales in 2011-2013

This is the final version of the article. Available from Nature Publishing Group via the DOI in this record.In the United Kingdom, European badgers Meles meles are a protected species and an important wildlife reservoir of bovine tuberculosis. We conducted a survey of badger dens (main setts) in 1614 1 km squares across England and Wales, between November 2011 and March 2013. Using main setts as a proxy for badger social groups, the estimated mean density of badger social groups in England and Wales was 0.485 km(-2) (95% confidence interval 0.449-0.521) and the estimated abundance of social groups was 71,600 (66,400-76,900). In the 25 years since the first survey in 1985-88, the annual rate of increase in the estimated number of badger social groups was 2.6% (2.2-2.9%), equating to an 88% (70-105%) increase across England and Wales. In England, we estimate there has been an increase of 103% (83-123%) in badger social groups, while in Wales there has been little change (-25 to +49%).We are grateful to the thousands of landowners for their kind co-operation in granting access to their land. This study was funded by the Department for Environment, Food and Rural Affairs, as part of England and Wales national research activities. Fieldwork was conducted by staff of the National Wildlife Management Centre. Access to data from the 1985–88 survey was licensed by the Joint Nature Conservation Committee, to whom the rights of the Nature Conservancy Council had passed

Characterization of potential superspreader farms for bovine tuberculosis: A review

This is the final version. Available on open access from Wiley via the DOI in this recordBACKGROUND: Variation in host attributes that influence their contact rates and infectiousness can lead some individuals to make disproportionate contributions to the spread of infections. Understanding the roles of such 'superspreaders' can be crucial in deciding where to direct disease surveillance and controls to greatest effect. In the epidemiology of bovine tuberculosis (bTB) in Great Britain, it has been suggested that a minority of cattle farms or herds might make disproportionate contributions to the spread of Mycobacterium bovis, and hence might be considered 'superspreader farms'. OBJECTIVES AND METHODS: We review the literature to identify the characteristics of farms that have the potential to contribute to exceptional values in the three main components of the farm reproductive number - Rf : contact rate, infectiousness and duration of infectiousness, and therefore might characterize potential superspreader farms for bovine tuberculosis in Great Britain. RESULTS: Farms exhibit marked heterogeneity in contact rates arising from between-farm trading of cattle. A minority of farms act as trading hubs that greatly augment connections within cattle trading networks. Herd infectiousness might be increased by high within-herd transmission or the presence of supershedding individuals, or infectiousness might be prolonged due to undetected infections or by repeated local transmission, via wildlife or fomites. CONCLUSIONS: Targeting control methods on putative superspreader farms might yield disproportionate benefits in controlling endemic bovine tuberculosis in Great Britain. However, real-time identification of any such farms, and integration of controls with industry practices, present analytical, operational and policy challenges.Biotechnology and Biological Sciences Research Council (BBSRC)Animal and Plant Health Agenc