Wild ungulates are increasing in several regions of the world, recolonizing the empty niche left by previous livestock systems. Due to their important role as ecosystem engineers, wild ungulates can ...modify and change vegetation structure, as well as modulate soil ecological processes, affecting the remaining components of communities and posing new management challenges. Several studies have evaluated the effects of wild ungulates on other guilds, but the results are taxonomically biased. Thus, our goal is to synthesise the overall effects of wild ungulates on smaller mammals on a broad scale.
Due to the complexity of assessing these impacts throughout the ecological network, we focused on mammals since they occupy different trophic levels and are key taxa in food webs. We conducted a review of the documented effects of wild ungulates on the guild's abundance of mammals with less than 10 kg, which revealed a gap in the literature regarding how higher trophic levels respond to wild ungulate disturbances. Using a hierarchical meta‐analytic approach, we assessed, on a subset of articles, whether the presence of wild ungulates affects the guild of small mammals and whether these effects were associated with biome, wild ungulates' body mass and foraging strategy, and small mammals' body mass.
A quantitative meta‐analysis was possible only for small mammals (Rodentia/Soricomorpha/Macroscelidea <1 kg) and revealed that their abundance tended to decrease with increasing abundance of wild ungulates. The magnitude of this impact, however, was modulated by body mass, being greater for larger small mammals than for smaller ones.
The impacts of wild ungulates might result in changes in the abundance of small mammals through direct and indirect pathways. Our results motivate a more holistic evaluation of rewilding projects and the correct assessment of the effects concerning wild ungulates' reintroductions.
Our systematic review found 57 articles studying the effect of wild ungulates presence on smaller mammals, from rodents to lagomorphs and carnivores. Half of these studies were dedicated to rodents, and only one study quantified the direct impact of wild ungulates on carnivores, bringing light to this information gap. Our meta‐analysis on the effects of wild ungulates on small mammals (<1 kg) revealed a clear negative effect, with lower small mammal abundances in areas with higher wild ungulate presence. The detected impacts of wild ungulates might result in changes in the abundance of small mammals through direct and indirect pathways, such as reduction of food resources and habitat modification. Our results motivate a more holistic evaluation of rewilding projects and the correct assessment of the effects concerning wild ungulates reintroductions.
Livestock predation by large carnivores and their persecution by local communities are major conservation concerns. In order to prevent speculations and reduce conflicts, it is crucial to get ...detailed and accurate data on predators' dietary ecology, which is particularly important in human dominated landscapes where livestock densities are high. This is the case of the endangered Iberian wolf in Portugal, an endemic subspecies of the Iberian Peninsula, which has seen its population distribution and abundance decline throughout the 20th century. Accordingly, the diet of the Iberian wolf was analyzed, using scat analysis, in a humanized landscape in central Portugal. From 2011 to 2014, a total of 295 wolf scats were collected from transects distributed throughout the study area, prospected on a monthly basis. Scat analysis indicated a high dependence of Iberian wolf on livestock. Domestic goat predominated the diet (62% of the scats), followed by cow (20%) and sheep (13%); the only wild ungulate present in the scat analysis was the wild boar (4% of the scats). Our results show that even though livestock constitute most part of wolves diet, different livestock species may represent different predation opportunities. We conclude that the high levels of livestock consumption may be a result of low diversity and density of wild ungulates that settles livestock as the only abundant prey for wolves. Our findings help on the understanding of the Iberian wolf feeding ecology and have implications for conflict management strategies. Finally, management implications are discussed and solutions are recommended.
Antimicrobial resistance (AMR) is a complex and global problem. Despite the growing literature on AMR in the medical and veterinary settings, there is still a lack of knowledge on the wildlife ...compartment. The main aim of this study was to report the global trends in AMR research in wildlife, through a bibliometric study of articles found in the Web of Science database. Search terms were “ANTIMICROBIAL” OR “ANTIBIOTIC” AND “RESISTANT” OR “RESISTANCE” and “WILDLIFE” “MAMMAL” “BIRD” “REPTILE” “FERAL” “FREE RANGE”. A total of 219 articles were obtained, published between 1979 and 2019. A rising interest in the last decades towards this topic becomes evident. During this period, the scientific literature was distributed among several scientific areas, however it became more multidisciplinary in the last years, focusing on the “One Health” paradigm. There was a geographical bias in the research outputs: most published documents were from the United States, followed by Spain, Portugal and the United Kingdom. The most productive institutions in terms of publication number were located in Portugal and Spain. An important level of international collaboration was identified. An analysis of the main keywords showed an overall dominance of “AMR”, “E. coli”, “genes”, “prevalence”, “bacteria”, “Salmonella spp.” and “wild birds”. This is the first study providing a global overview of the spatial and temporal trends of research related to AMR in wildlife. Given the growth tendency over the last years, it is envisaged that scientific production will expand in the future. In addition to offering a broad view of the existing research trends, this study identifies research gaps both in terms of geographical incidence and in relation to unexplored subtopics. Unearthing scientific areas that should be explored in the future is key to designing new strategic research agendas in AMR research in wildlife and to inform funding programs.
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•First study providing a global overview of the spatial and temporal trends of research related to AMR in wildlife.•Rising interest on AMR research on wildlife worldwide but there is a spatial and taxonomic bias in the research outputs.•This study highlights poorly surveyed countries, where intensified sampling efforts are crucial.•Research trends and scientific areas are unearthedthat should be invested in and explored in the future.
The
gene spread is worldwide recognized as a public health threat at multidrug-resistant infections therapy level. Here, we report for the first time, to the best of our knowledge, the detection of ...the globally distributed IncX4 plasmid carrying
(
/IncX4) in Escherichia coli isolated from a wild mammal in Portugal and Europe. This plasmid was found in a ST533 E. coli isolate with a multidrug-resistant profile, virulence potential, and possibly phylogenetically related to human isolates. Our work contributes to highlight the importance of antimicrobial resistance (AMR) surveillance in wildlife, an important compartment of the whole ecosystem often overlooked in the fight against AMR.
Colistin resistance mediated by plasmids is recognized worldwide as an emergency problem connected with the whole ecosystem, since is well described in the interface of the human-animal-environment. The plasmid IncX4 is reported as one of the most prevalent plasmids harboring the gene
. On an European scale the plasmid IncX4 carrying
has been described in humans, the environment, and animals, including wildlife, but only in wild birds. This study shows the first report of the plasmid IncX4 harboring
in a wild mammal in Portugal and Europe, identified in a ST533 E. coli commensal that is, curiously, more related to isolates from humans than from livestock. Our findings show that the plasmid IncX4 harboring
is well established in a colistin resistance drive embracing the whole ecosystem.
The Iberian wolf (Canis lupus signatus) is a top predator that inhabits the Iberian Peninsula. In Portugal, its numbers and distribution declined throughout the 20th century, due to human ...persecution, habitat degradation and prey decline, which have led to higher predation rates of livestock in the remaining packs. In Montesinho Natural Park (northeast Portugal), wild ungulate populations have been increasing in the last years, which may have led wolf to predate upon them. In order to assess Iberian wolf diet in this area, 85 wolf scats were collected from transects distributed throughout the study area in two periods between November 2017 and August 2019. Scat analysis indicated a high predation on wild ungulates, where the frequency of occurrence showed that roe deer was the most consumed prey (44%), followed by red deer (26%) and wild boar (24%). Domestic/wild cat (6%), domestic goat and stone marten (5%) were consumed in lower quantities. It was found a higher selection towards roe deer (D = 0.71) and this was the only prey item which was significantly dependent of the season of the year (χ2 = 16.95, df = 3, p < 0.001). This is the first study in Portugal where was recorded that wolves feed mainly on wild ungulates. We conclude that lower livestock predation may be correlated with higher wild ungulates densities in our study area, as well as suitable husbandry practices, leading to a shift on Iberian wolf diet from mainly livestock on previous studies to wild ungulates.
Antimicrobial resistance (AMR) can be highlighted as one of the most significant health concerns among the last decades, for which antimicrobial drug use in food-producing animals has contributed as ...one of the major drivers. Food-producing animals are one of the most important and rapidly expanding commercial agricultural sectors worldwide but there is currently limited knowledge on the temporal and geographical distribution of scientific research on antimicrobial resistance in food-producing animals. We provide a global overview of the spatial and temporal trends of scientific knowledge on AMR in food-producing animals. Peer-reviewed papers of AMR on food-producing animals were retrieved from the Web of Science, systemized and dissected. The final validated dataset contained 1341 occurrences observations covering the 1957–2018 period. There has been a shift of research efforts, both geographically and temporally, emphasizing regional differences in food animal production and changing practices in the food production industry. It becomes evident that many regions have been poorly surveyed, wherein intensified sampling and testing efforts should be most valuable. This systematization of knowledge will be crucial in helping to determine how to optimally allocate limited resources available for AMR monitor and control, aiding in the prediction where the threat of new resistant infections will be greatest. AMR research in food-producing animals in developing countries is markedly growing, reflecting changes in food animals production systems but also posing a particularly significant threat, not only due to intensive animal production, but also exacerbated by poor sanitation. We highlight that the use of antibiotics in food producing animals is pervasive, calling for urgent action. These findings raise the possibility to finetuning key priorities on AMR global issues.
•This is the first study providing a global overview of the spatial and temporal trends of research related to AMR in food-producing animals.•There is a clear rising interest on AMR research in food-producing animals worldwide but there is a spatial bias.•This study highlights poorly surveyed countries, where intensified sampling efforts are crucial.•Research trends and scientific areas are unearthed that should be invested in and explored in the future.
The roe deer (
) is native and widespread in Europe and its phylogeography has been clarified in the last decades. Southern peninsulas are considered as reservoirs of genetic diversity and the source ...for the recolonization of Europe after the last glacial maximum. Even though roe deer populations have been genetically characterized, there is a major knowledge gap about the populations at the western edge of its distribution. To fill this caveat, and based on mitochondrial and nuclear DNA data, we aim to: (i) characterize the genetic diversity and structure of roe deer in western Iberia; (ii) clarify the origins and phylogeographical affinities of these populations, namely the relict population from Peneda Gerês National Park (PNPG, Portugal) and the likely allochthonous populations from central and south (CS) Portugal; (iii) discuss the implications of our findings for the management and conservation of the roe deer. Three major genetic clusters were inferred based on nuclear genotypes and were structured in a similar way as the three major mtDNA clades present in Iberia. Patterns inferred with nuclear markers confirmed PNPG as a relict population. Roe deer from CS Portugal share haplotypes with Central Europe rather than with other western Iberian populations, confirming its mainly allochthonous origin. Our results highlight western Iberia as a diversity hotspot for roe deer. We highlight the role of intraspecific genetic diversity as a source of resilience against ongoing global changes; the need for transboundary management and the importance of genetic data to inform management and conservation. When considered, repopulation or translocation measures should follow the IUCN Law of Reintroductions and meticulously conducted in order to preserve the genetic heritage of the species.
Spatial epidemiology tools play a critical role in effectively allocating resources to curb the spread of animal diseases. This study focuses on classical scrapie (CS), an animal prion disease ...identified in Portugal, which infects small ruminant flocks and has been shown to be experimentally transmissible to wild cervids. Utilising remote sensing technologies and semi-automatic classification models, we aimed to evaluate the risk of interspecies prion transmission from domestic small ruminants to wild cervids (hosts). To achieve this, we gathered data related to hosts and infected small ruminant flocks. Furthermore, we collected and processed freely available, medium-resolution satellite imagery to derive vegetative and biophysical spectral indices capable of representing the primary habitat features. By employing a pixel-based species distribution model, we integrated the compiled geographical distribution data and spectral data with five supervised classification algorithms (random forest, classification tree analysis, artificial neural network, generalised linear model, and generalised additive model). The consensus map allowed accurate predictions of spatialised regions exhibiting spectral characteristics similar to where CS and its hosts were initially identified. By overlapping suitable territories for disease and host occurrence, we created a spatially explicit tool that assesses the risk of prion spill-over from domestic small ruminants to wild cervids. The described methodology is highly replicable and freely accessible, thus emphasising its practical utility. This study underscores the substantial contribution of model-based spatial analysis to disease monitoring and lays the groundwork for defining populations at risk and implementing targeted control and prevention strategies, thus safeguarding both animal and public health.
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