Much progress has been made toward assessing and improving animal welfare in conservation. However, several glaring knowledge gaps remain where animal‐welfare concerns exist but animal‐welfare ...studies have not been performed in politically sensitive contexts. Based on contemporary issues in Australia, we identified 4 topics that require more research: animal‐welfare oversight for operations designated as management (as opposed to research); animal‐welfare impacts of biological agents used to control invasive animals; welfare of animals hunted recreationally; and animal‐welfare impacts associated with indigenous wildlife use. Animal‐welfare science may be applied to these sensitive topics through simple quantitative studies (e.g., quantifying the frequency of adverse animal‐welfare events). Several such studies have effectively addressed animal‐welfare concerns in similarly contentious contexts, including feral camel (Camelus dromedarius) culling in Australia, recreational hunting in Scandinavia, and indigenous whale hunting in the United States. For discussions of animal welfare in conservation to be evidence‐based, courageous research is required in the 4 key areas we identified.
Temas de Bienestar Animal Sin Tratar en la Conservación
Resumen
En la conservación se ha progresado mucho en la evaluación y el mejoramiento del bienestar animal. Sin embargo, todavía permanecen varios vacíos evidentes en donde existe preocupación por el bienestar animal, pero los estudios sobre este bienestar no se han realizado en contextos políticamente sensibles. Con base en temas contemporáneos en Australia, identificamos cuatro temas que requieren de más investigación: omisión del bienestar animal por operaciones designadas como manejo (en lugar de investigación); impactos de los agentes biológicos usados para controlar a animales invasores sobre el bienestar animal; bienestar de los animales cazados por recreación; e impactos sobre el bienestar animal asociados con el uso de la fauna nativa. La ciencia del bienestar animal puede aplicarse a estos temas sensibles por medio de estudios cuantitativos (p. ej.: cuantificación de la frecuencia de eventos adversos para el bienestar animal). Varios de estos estudios han tratado efectivamente las preocupaciones por el bienestar animal en contextos similarmente polémicos, incluyendo el sacrificio de camellos ferales (Camelus dromedarius) en Australia, la cacería recreativa en Escandinavia, y la caza de ballenas por aborígenes en los Estados Unidos. Para que las discusiones sobre el bienestar animal en la conservación estén basadas en evidencias, se requiere de investigaciones atrevidas en las cuatro áreas clave que identificamos.
摘要
在保护中, 对动物福利的评估和改善已经取得了很大进展。然而, 在动物福利问题尚未解决, 却因敏感的政治环境而难以进行动物福利研究的地方, 仍存在几个明显的知识空缺。基于目前澳大利亚面临的问题, 我们确定了四个需要进一步研究的主题: 为管理 (而非研究) 进行特定操作时的动物福利监管; 用于控制入侵动物的生物防治天敌对动物福利的影响; 娱乐性狩猎中的动物福利问题, 以及与原生野生动物利用有关的动物福利问题。我们认为, 可以通过简单的定量研究 (如量化危害动物福利的事件发生的频率) 将动物福利科学应用于这些敏感话题。一些这样的研究已经有效地解决了在类似的有争议的情况下的动物福利问题, 包括澳大利亚的野骆驼 (Camelus dromedarius) 选择性捕杀、斯堪的纳维亚的娱乐性狩猎, 以及美国原生鲸类的捕杀。为保证对保护中动物福利问题的讨论建立在证据之上, 我们要勇于在这四个关键领域发起研究。【翻译: 胡怡思; 审校: 聂永刚】
Article impact statement: Politically sensitive animal‐welfare issues in conservation need to be addressed.
Tissue samples from Australian carpet pythons (Morelia spilota) with neurological disease were screened for viruses using next-generation sequencing. Coding complete genomes of two bornaviruses were ...identified with the gene order 3'-N-X-P-G-M-L, representing a transposition of the G and M genes compared to other bornaviruses and most mononegaviruses. Use of these viruses to search available vertebrate genomes enabled recognition of further endogenous bornavirus-like elements (EBLs) in diverse placental mammals, including humans. Codivergence patterns and shared integration sites revealed an ancestral laurasiatherian EBLG integration (77 million years ago MYA) and a previously identified afrotherian EBLG integration (83 MYA). The novel python bornaviruses clustered more closely with these EBLs than with other exogenous bornaviruses, suggesting that these viruses diverged from previously known bornaviruses prior to the end-Cretaceous (K-Pg) extinction, 66 MYA. It is possible that EBLs protected mammals from ancient bornaviral disease, providing a selective advantage in the recovery from the K-Pg extinction. A degenerate PCR primer set was developed to detect a highly conserved region of the bornaviral polymerase gene. It was used to detect 15 more genetically distinct bornaviruses from Australian pythons that represent a group that is likely to contain a number of novel species.
is a family of negative-sense RNA viruses with genomes of about 17.2 kb that have been found in snakes. The sunvirid genome comprises nonsegmented RNA with six open reading frames (ORFs) >1 kb that ...are predicted to encode six proteins. This is a summary of the International Committee on Taxonomy of Viruses (ICTV) Report on the family
, which is available at ictv.global/report/sunviridae.
Quokkas (Setonix brachyurus) are small macropodid marsupials from Western Australia, which are identified as of conservation concern. Studies on their blood analytes exist but involve small sample ...sizes and are associated with very little information concerning the health of the animals. Blood was collected from free-ranging quokkas from Rottnest Island (n = 113) and mainland (n = 37) Western Australia, between September 2010 and December 2011, to establish haematology and blood chemistry reference intervals. Differences in haematology and blood chemistry between sites (Rottnest Island v mainland) were significant for haematology (HMT, p = 0.003), blood chemistry (BLC, p = 0.001) and peripheral blood cell morphology (PBCM, p = 0.001). Except for alkaline phosphatase, all blood chemistry analytes were higher in mainland animals. There were also differences with time of year in HMT (p = 0.001), BLC (p = 0.001) and PBCM (p = 0.001) for Rottnest Island quokkas. A small sample of captive animals (n = 8) were opportunistically sampled for plasma concentrations of vitamin E and were found to be deficient compared with wild-caught animals. Fifty-eight of the 150 quokkas were also tested for the presence of Salmonella, microfilariae, Macropodid herpesvirus-6, Theileria spp., Babesia spp., trypanosomes, Cryptococcus spp. and other saprophytic fungi. All eight infectious agents were detected in this study. Infectious agents were detected in 24 of these 58 quokkas (41%), with more than one infectious agent detected for all 24 individuals. Salmonella were detected concurrently with microfilariae in 8 of these 24 quokkas, and this mixed infection was associated with lower values across all haematological analytes, with Salmonella having the greater involvement in the decreased haematological values (p < 0.05). There was no evidence for an effect of sex on HMT, BLC and PBCM. Our data provide important haematological and blood chemistry reference intervals for free-ranging quokkas. We applied novel methods of analyses to HMT and BLC that can be used more broadly, aiding identification of potential disease in wildlife.
Despite recent advances in molecular techniques, infection studies remain an important tool for biosecurity, veterinary and conservation medicines. Experimental infection studies are performed for ...many reasons: to investigate causal links between pathogens and disease, to study host species susceptibility, to study immune response to inoculation, to investigate pathogen transmission and to investigate methods for infection control. Experimental infection studies using viruses in reptiles have been conducted sporadically since at least the 1930s and this continues to be a fertile area of research. This review catalogues previously published research in the field. The key parameters of each study are tabulated, providing a summary of more than 100 experiments linked to their original publications. Common themes and trends within the data are discussed.
Ethical food choices have become an important societal theme in post-industrial countries. Many consumers are particularly interested in the animal welfare implications of the various foods they may ...choose to consume. However, concepts in animal welfare are rapidly evolving towards consideration of all animals (including wildlife) in contemporary approaches such as "One Welfare". This approach requires recognition that negative impacts (harms) may be intentional and obvious (e.g., slaughter of livestock) but also include the under-appreciated indirect or unintentional harms that often impact wildlife (e.g., land clearing). This is especially true in the Anthropocene, where impacts on non-human life are almost ubiquitous across all human activities. We applied the "harms" model of animal welfare assessment to several common food production systems and provide a framework for assessing the breadth (not intensity) of harms imposed. We considered all harms caused to wild as well as domestic animals, both direct effects and indirect effects. We described 21 forms of harm and considered how they applied to 16 forms of food production. Our analysis suggests that all food production systems harm animals to some degree and that the majority of these harms affect wildlife, not livestock. We conclude that the food production systems likely to impose the greatest overall breadth of harms to animals are intensive animal agriculture industries (e.g., dairy) that rely on a secondary food production system (e.g., cropping), while harvesting of locally available wild plants, mushrooms or seaweed is likely to impose the least harms. We present this conceptual analysis as a resource for those who want to begin considering the complex animal welfare trade-offs involved in their food choices.
The Five Domains model is influential in contemporary studies of animal welfare. It was originally presented as a conceptual model to understand the types of impact that procedures may impose on ...experimental animals. Its application has since broadened to cover a wide range of animal species and forms of animal use. However, it has also increasingly been applied as an animal welfare assessment tool, which is the focus of this paper. Several critical limitations associated with this approach have not been widely acknowledged, including that: (1) it relies upon expert or stakeholder opinion, with little transparency around the selection of these individuals; (2) quantitative scoring is typically attempted despite the absence of clear principles for aggregation of welfare measures and few attempts to account for uncertainty; (3) there have been few efforts to measure the repeatability of findings; and (4) it does not consider indirect and unintentional impacts such as those imposed on non-target animals. These deficiencies lead to concerns surrounding testability, repeatability and the potential for manipulation. We provide suggestions for refinement of how the Five Domains model is applied to partially address these limitations. We argue that the Five Domains model is useful for systematic consideration of all sources of possible welfare compromise and enhancement, but is not, in its current state, fit-for-purpose as an assessment tool. We argue for wider acknowledgment of the operational limits of using the model as an assessment tool, prioritisation of the studies needed for its validation, and encourage improvements to this approach.
There is growing recognition of the threat posed by toxic lead-based ammunition. One group of domestic animals known to be susceptible to harmful lead exposure via this route is hunting dogs. ...Scent-trailing dogs (‘hounds’) are used to hunt introduced sambar deer (Cervus unicolor) during a prescribed eight-month (April–November) annual hunting season, during which they are fed fresh venison, in Victoria, south-eastern Australia. We used this annual season as a natural experiment to undertake longitudinal sampling of dogs for lead exposure. Blood was collected from 27 dogs owned by four different deer hunters and comprising three different breeds just prior to the start of the hound hunting season (March 2022) and in the middle of the season (August 2022), and blood lead levels (BLLs) (μg/dL) were determined via inductively coupled plasma mass spectrometry (ICP-MS). Using Tobit regression, the expected BLLs across all dogs were significantly lower before the season (0.50 μg/dL, standard error SE = 0.32 μg/dL) than during the season (1.39 μg/dL, SE = 0.35 μg/dL) (p = 0.01). However, when the breed of dog was included in the analyses, this effect was only significant in beagles (P < 0.001), not bloodhounds (p = 0.73) or harriers (p = 0.43). For 32% of the dogs before the season, and 56% during the season, BLLs exceeded the established threshold concentration for developmental neurotoxicity in humans (1.2 μg/dL). Time since most recent venison feeding, sex of dog and owner were not associated with BLLs. The finding that BLLs more than doubled during the hunting season indicates that lead exposure is a risk in this context. These results expand the sphere of impact from environmental lead in Australia from wild animals and humans, to include some groups of domestic animals, a textbook example of a One Health issue.
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•Lead from ammunition harms domestic as well as wild animals.•Hunting dogs are at particularly high risk of harmful lead exposure.•Blood lead levels in 27 dogs increased during an Australian deer hunting season.•Ammunition-derived lead is a One health issue requiring urgent mitigation.
Urban ecosystems and remnant habitat 'islands' therein, provide important strongholds for many wildlife species including those of conservation significance. However, the persistence of these ...habitats can be undermined if their structure and function are too severely disrupted. Urban wetlands, specifically, are usually degraded by a monoculture of invasive vegetation, disrupted hydrology, and chronic-contamination from a suite of anthropogenic pollutants. Top predators—as bioindicators—can be used to assess and monitor the health of these ecosystems. We measured eight health parameters (e.g., parasites, wounds and scars, tail loss and body condition) in a wetland top predator, the western tiger snake, Notechis scutatus occidentalis. For three years, snakes were sampled across four wetlands along an urban gradient. For each site, we used GIS software to measure the area of different landscapes and calculate an urbanisation–landscape score. Previously published research on snake contamination informed our calculations of a metal-pollution index for each site. We used generalised linear mixed models to assess the relationship between all health parameters and site variables. We found the metal-pollution index to have the most significant association with poor body condition. Although parasitism, tail loss and wounds differed among sites, none of these parameters influenced body condition. Additionally, the suite of health parameters suggested differing health status among sites; however, our measure of contemporary landscape urbanisation was never a significant predictor variable. Our results suggest that the health of wetland predators surrounding a rapidly growing city may be offset by higher levels of environmental pollution.
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•Tiger snake health parameters differed among urban wetlands.•Urbanisation and metal(loid) pollution were not correlated.•Metal(loid) pollution was the strongest predictor of poor body condition.•Snakes in the most urbanised and polluted wetland had similar poor health profiles.•Poor body condition may translate into reduced population fitness.
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