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BackgroundThe luxury effect describes the positive relationship between affluence and organism diversity or activity in urban ecosystems. Driven by human activities, the luxury effect can potentially be found at a broader scale across different landscapes. Previously, the luxury effect relationship has been established within a city for two bat species, the red bat (Lasiurus borealis) and the evening bat (Nycticeius humeralis). We examined landscape-scale patterns of bat activity distribution—using empirical data for seven bat species for the luxury effect. We also identified bat-land cover associations for each species. Across North Carolina, USA, we used the mobile transect survey protocol of the North American Monitoring Program to record bat activity at 43 sites from 2015 to 2018. We collected land cover and income data at our transect locations to construct generalized linear mixed models to identify bat-land cover and bat-income relationships.ResultsWe found that across landscapes, activity of the red bat and the evening bat was positively correlated to income independent of land cover, consistent with previous single-city results. We found a negative relationship between hoary bat (Lasiurus cinereus) activity and income. All seven species had specific land cover associations. Additionally, we found a positive interaction term between income and evergreen forest for the red bat and a positive interaction term between income and woody wetland for hoary bat.ConclusionsOur results demonstrated that the luxury effect is an ecological pattern that can be found at a broad spatial scale across different landscapes. We highlight the need for multi-scale ecology studies to identify the mechanism(s) underlying the luxury effect and that the luxury effect could cause inequity in how people receive the ecosystem services provided by bats.

Low winter temperatures are a major driver of hibernation and migration in temperate North American bats. Hibernation and migration in turn affect bat mortality via white-nose syndrome and collisions with wind turbines. To describe winter bat acoustic activity across a wide temperature gradient and to understand species-specific responses to low temperatures, we recorded nightly acoustic activity of bats at 15 sites across the state of North Carolina, United States, from December through February 2016 – 2018. Bat acoustic activity was recorded at all sites during both winters. Nightly probability of bat acoustic presence regressed positively on ambient temperature. Nightly probability of presence in Lasionycteris noctivagans (silver-haired bat) and Eptesicus fuscus (big brown bat) regressed negatively on wind speed. The mean probability of presence within the same winter condition was highest for L. noctivagans, followed by E. fuscus, Perimyotis subflavus (tricolored bat), and Lasiurus cinereus (hoary bat). Differences in species’ mean body weight and roosting preference explained part of the variation of the species-specific probability of presence. Our results can be used to predict bat acoustic presence for these species across the southeastern United States in winter, and better understand the potential threats to bats such as white-nose syndrome and wind turbine interactions.

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The biological changes that have occurred in Aotearoa New Zealand following human settlement are well documented with almost all ecosystems and taxa having been negatively impacted. Against this background of loss there have been remarkable advances in conservation management, particularly in the large-scale eradication and control of exotic mammalian pests. In 2016, the New Zealand Government announced Predator Free 2050, an ambitious project to eradicate introduced predators in Aotearoa New Zealand by 2050. Here, we discuss conservation translocations in the context of Predator Free 2050 aspirations. Our review draws together knowledge from Aotearoa New Zealand’s rich history of translocations and outlines a framework to support translocation decision making in the predator-free era. Predator Free 2050 aspirations encompass an ongoing question in conservation management; should we focus on maintaining small protected populations, because this seems generally easier and currently achievable, or on reversing declines in the large mainland areas that contain most of our biodiversity, a much harder challenge largely reliant on the continued use of aerially applied toxins? We focus on successfully establishing small translocated populations because they will provide the source populations for colonisation of a predator-free landscape. We define a successful translocation as one that meets a clear set of fundamental objectives defined a priori. If translocation objectives are clearly defined all subsequent decisions about factors that influence conservation translocation outcomes (e.g. the cultural and social setting, pest thresholds, habitat quality, genetic management) will be easier. Therefore, we encourage careful thinking in formulating conservation translocation objectives that align with aspirations for a predator-free Aotearoa NZ. We discourage a focus on any single element of planning and rather encourage all people involved in conservation translocations, particularly decision makers, to explicitly recognise the multiple values-based objectives associated with conservation translocations.