Carnivores Research Articles

Reducing the climate impact of food choices with comparable nutritional quality: a randomised trial

Abstract Background Diets largely contribute to the global disease burden, and a third of global warming emissions. We assessed the climate footprint reduction effect of framing the climate impact of diets as a collective action problem (social dilemma), compared or in combination with a reflective intervention (information) and a choice architecture intervention (nudge). Interactions with lifestyle factors were examined. Methods A randomised 2X2X2 between-subjects online experiment was conducted among university students ≥18 years, enrolled at a Swiss university, and not following a medically prescribed diet. The outcome was the mean climate footprint of food choices (in kg CO2-eq), based on a Life Cycle Assessment. Meals varied in climate footprints while adhering to the Swiss dietary guidelines. Results This analysis focused on the subset of meat eaters (n = 1691). Median age was 24 years, and 59.85% (n = 1012) were female. Seven intervention groups resulted in significantly lower climate footprints compared to the control. The social dilemma plus a nudge menu was the most effective behavioural intervention leading to 20.20% footprint reduction (b = -1.20 kg CO2-eq) compared to the control group (Mcontrol=5.94, SDcontrol=2.76; Mdilemma+nudge=4.74, SDdilemma+nudge=2.09 t(436) = -5.10, p < 0.001). Lifestyle factors linked to a higher climate footprint of food choices included adhering to a low-calorie diet (b = 1.21 kg CO2-eq, p < 0.05), or a muscle gain diet (b = 2.12 kg CO2-eq p < 0.05) and practising physical activities (PA) while adhering to a muscle-gain diet (Aerobic/Cardio: 3.82 kg CO2-eq, p < 0.05; Muscle-strengthening: 2.24 kg CO2-eq, p < 0.05). Conclusions The combination of reflective collective action communication and menu nudges is an effective strategy to mitigate the climate footprint of food choices in education institutions. Adherence to a muscle-gain diet was identified as a critical but manageable lifestyle factor linked to a higher climate footprint. Key messages • The dilemma plus a nudge was the most effective to reduce the climate footprint of food choices. • This combined intervention can manage the high climate footprints linked to lifestyle factors.

Trophic Position Stability of Benthic Organisms in a Changing Food Web of an Arctic Fjord Under the Pressure of an Invasive Predatory Snow Crab, Chionoecetes opilio

The introduction of a large predatory snow crab, Chionoecetes opilio, into the Kara Sea is a unique situation where the impact of an invasive species affecting an otherwise undisturbed ecosystem can be observed unhindered by other ecosystem stressors. Trophic interactions are one of the principal relationships between animals and can help assess an ecosystem’s stability. The trophic positions and sources of organic material for the most common benthic species of Blagopoluchiya Bay sampled at different stages of the invasion were calculated using stable isotope analysis. The most pronounced changes in the trophic web occurred amongst the megabenthic species, where previously most abundant deposit-feeding ophiuroids have disappeared. However, the benthic species’ trophic position and primary production source preference did not change. A sea star, Urasterias lincki, remained the highest carnivore in the bay, and the invasive crab remained at a lower trophic level, showing higher omnivory in its diet. Any changes in the consumers’ prey items were within the same trophic level. Overall, active predators became one of the most abundant feeding mode groups. The average weighted trophic position of all megabenthic species increased to the third trophic level, where mostly secondary consumers remained.

‘Stop the Death Transports!’ Holocaust and slavery references in an Israeli campaign against animal live transports

ABSTRACT Animal rights organisations worldwide fight against live shipments of meat animals. The main Israeli NGOs leading the fight are Animals-Now, Israel against Live Shipments, and Let the Animals Live. Their visual rhetoric highlights the cruelty of these shipments. Combined with written messages, photographs of animal suffering appeal to viewers’ emotions and conscience. This article examined ‘Stop the Death Transports!’ – The most extensive campaign led by these NGOs, together with Animals Australia, in 2016. It analysed the campaign poster from the approaches of photography semiotics and visual contextual analysis, informed by theories of visual culture and animal ethics. The campaign represents an intermediate approach between the hardcore and softcore approaches, using visual and verbal references to the Holocaust and slavery. However, though the use of the Holocaust is highly charged for local Jewish viewers thus contributing to the understanding of the immorality of consuming meat, it may in fact assuage their conscience by shifting the moral burden from the meat eaters to the transporters.

The impact of explaining vegetarian meal requests on the affective responses and perceptions of meat eaters

Social situations can present challenges for those looking to reduce or avoid eating meat. In an experimental vignette study with a large representative sample of 1,117 UK-based meat eaters, we explore affective responses to requests for vegetarian meals and perceptions of those making the request across four social situations: a BBQ, a pub, a restaurant dinner, and a dinner party. We examine moderators of these perceptions including whether the requester presents themselves as vegetarian or a meat restrictor and whether they cite health, environmental or no motives for their request. Overall, we find that these moderators have a greater impact on meat eaters’ perceptions of the requester than on their affective responses to the request. We also find that these outcomes are more impacted by the mention of motives than they are diet type. Standout findings include evidence that people citing environmental motives for their vegetarian meal request are perceived more negatively, while those with health motives are perceived more positively. We also identify substantial heterogeneity across the respondents’ levels of meat attachment: those who are more attached to meat have more negative perceptions of vegetarian meal requesters and experience higher negative affect and lower positive affect in response to the request.

Carryover effects of tire wear particle leachate threaten the reproduction of a model zooplankton across multiple generations.

The toxic additives that leach from tire wear particles (TWPs) cause mass die-offs in fish and impact zooplankton as secondary consumers in the aquatic food web. In addition to the direct impacts of TWP leachate on a single generation, there may be potential delayed carryover effects across multiple generations from parental exposure, which may amplify the adverse effects of the leachate on individual reproduction and, consequently, on the entire population. In this study, the single, multiple, and transgenerational effects of TWP leachate at various concentrations on the reproduction and lifespan of the rotifer Brachionus calyciflorus were investigated. The results indicated that the lifespan and reproductive output of rotifers exposed to TWP leachate (0-1500 mg/L) decreased as the concentration increased above 250 mg/L. There was a clear multigenerational effect of TWP leachate on rotifer reproduction. The inhibition rates were consistently greater at 500 mg/L than at 250 mg/L leachate. Although the reproduction of rotifers exposed to 250 mg/L TWP leachate increased in the first two generations (P and F1), it was inhibited in subsequent generations. The inhibitory effect of 500 mg/L TWP leachate persisted across all generations, leading to population extinction by the F4 generation. A significant transgenerational effect of TWP leachate was found on reproduction. The adverse impact of exposure to 250 mg/L leachate for fewer than three generations could be reversed when offspring were transferred to clean media. However, this recovery was not observed after continuous exposure for more than four generations. Exposure to high-dose TWP leachate also caused irreversible damage to reproduction. Therefore, TWP leachate can result in cascading toxicity on zooplankton populations through carryover and cumulative effects on reproduction.

Investigation of Microplastic Contamination in the Gastrointestinal Tract of Fish: A Comparative Study of Various Freshwater Species

The aqueous environment has been reported to be seriously threatened by the pollution of microplastics (MPs), which has been confirmed in numerous studies affecting various aquatic habitats. Despite this, few investigations exist on MP contamination in fish of specific regions. Thus, the current study aims to determine MP concentrations in the fish species of the Chhota Nagpur zone of eastern India. From August to September 2023, fish samples were collected from 10 km distance between two locations of Subarnarekha and Kharkai river banks through fishermen. Microplastics were found in the gastrointestinal tract of 45 fish of 8 species out of 48 samples. Of these species, six species were secondary consumers, while the remaining two were primary consumers. The average amount of microplastics consumed by each fish (n = 48) was 3.0 ± 1.8. A total of 144 microplastics were found in collected samples of fish species. Among the analyzed sample of MPs, 69.4% were fibers, films were (22.3%), and (8.3%) were fragments. The least contaminated species was T. ilisha (0.8 ± 0.7 particles/ind.), while L. rohita had the highest microplastic contamination (4.5 ± 1.7 particles/ind.). The present study found a negative correlation of - 0.83 between MP consumption and the mean body weight of fish. Similarly, a negative correlation of - 0.5 was found between the length of fish and MP intake. Polyamide (nylon), polypropylene, polyvinyl chloride, polycarbonate, polyethylene terephthalate, and polyethylene polymers were found. The size of MPs ranged from 45-355 μm and mainly were fibers. They were also predominantly blue and black. Polyamide and polyvinyl chloride were the common MP types in every specimen. The possible sources of MPs were fishing nets, ropes, and packaging material. This investigation points to MP contamination in aquatic ecosystems and particular species. It provides advanced knowledge of MP pollution, sources, and effects on regional ecosystems and public health.

Moderation Of Firm Size On The Effect Of Financial Performance On Tax Avoidance

This research was conducted to determine the influence of profitability, leverage, capital intensity, CSR, and firm size on tax avoidance and how firm size moderates this influence. The data in the research was taken using purposive random sampling by determining criteria from companies in the energy, basic materials, industrial, primary and secondary consumer goods sectors listed on the Indonesia Stock Exchange (IDX) from 2019 to 2021. The data were processed and analysed using multiple regression and moderated regression analysis using Eviews 10. The research results show that profitability has a positive and significant influence on tax avoidance, and leverage has a negative and significant influence on tax avoidance. Capital intensity, CSR activities and firm size do not influence tax avoidance. The research results also show that firm size can moderate the influence of leverage and capital intensity on tax avoidance.

Untangling the dairy paradox: How vegetarians experience and navigate the cognitive dissonance aroused by their dairy consumption

Most people eat meat, yet report valuing the environment, animal life, and their health, which contradicts this dietary behaviour. The psychological discomfort aroused by this value-behaviour inconsistency, and the strategies meat eaters use to resolve this unpleasant state, is termed the ‘meat paradox’. Vegetarians eschew meat consumption, but the negative implications of dairy are comparable to meat. We investigated the ‘dairy paradox’ in a sample of vegetarians (N = 378) using an experimental design. Specifically, we tested whether vegetarians experienced cognitive dissonance after reading about the environmental, animal welfare, and health impacts of dairy consumption when compared to a control group not exposed to this information. Then, we examined to what extent perceiving dairy consumption as Natural, Necessary, Normal, Nice, or Neglectable, and denial of cows' mental states (Experience or Agency) predicted reduced cognitive dissonance. Vegetarians in the dissonance-induction condition reported experiencing significantly greater dissonance, though they more strongly rejected the justification strategies. Instead, they reported greater intentions to reduce their dairy consumption than vegetarians in the control condition. Rather than replicating findings from the meat paradox literature, these results suggest that vegetarians respond to uncomfortable feelings about their value-behaviour conflict with a greater intention to abandon the incongruent behaviour, rather than endorsing the cognitions that justify it. This research provides evidence that vegetarians experience a dairy paradox. Given the success of our study in shifting participants away from behavioural justification and toward behavioural change intentions, our findings can help guide the design of interventions seeking to reduce dairy consumption.

Meating of the minds: Who denies animal mind in response to the meat paradox?

Most people abhor animal cruelty but choose to eat meat. To resolve feelings of conflict associated with this so-called “meat paradox”, meat-eaters appear to downplay the capacity of animals to think and feel. However, the strength of animal mind denial seems likely to vary between individuals—according to one’s concern for animal welfare or enjoyment of meat, for instance. Across two pre-registered studies (S1: N = 355, S2: N = 251), we examined personality traits, attitudes, and beliefs that may predict the strength of animal mind denial in relation to the meat paradox. Results suggest that those lower in openness/intellect or emotion regulation ability, or higher in meat-commitment, deny animal mind more strongly when reminded of the link between meat eating and animal suffering. We discuss the degree to which these findings align with dissonance-based explanations for animal mind-denial in response to the meat-paradox.

Is the general threatened status of four mammal groups affected by taxonomic changes over time?

The geographic range is a critical factor in assessing species’ threatened status on the IUCN Red List. A smaller geographic range increases the likelihood of a species being classified as threatened. Taxonomic revisions, which can split a widely distributed taxon into multiple smaller-range species, may elevate the threatened status for these newly recognized species. While taxonomic splitting is thought to increase the perceived threatened status of species, data on birds suggest the opposite, with newly recognized species being less threatened. No similar analysis has been conducted for mammals until now. This study compares the relationship between the number of recognized and threatened species in four mammalian orders (Carnivora, Cetartiodactyla, Chiroptera, and Rodentia) between 2005 and 2022. It was found that increases in species numbers due to taxonomic revisions correlated with increases in threatened species, particularly in Primates and Cetartiodactyla. The overall threatened status of these groups changed over time, with Primates and Cetartiodactyla becoming more threatened, while Rodentia became less threatened. We emphasize the need for consistent criteria in IUCN assessments to avoid biases, and we recommend that changes in the threatened status should only occur with robust evidence.

No need for meat as most customers do not leave canteens on Veggie Days

Switching to a diet lower in red meat has the potential to reduce greenhouse gas emissions. Using a unique time series of daily sales data from three German university canteens from 2017 to 2019, we analyse the effects of a monthly Veggie Day in a food-away-from-home context. We find that the temporary ban on meat dishes did not lead to a widespread boycott – as the heated public debates might have suggested. In our setting, a Veggie Day could reduce greenhouse gas emissions by up to 66%. However, especially at the site with a higher share of meat eaters on regular days, up to 22% of customers bypassed the meat-free main dishes on Veggie Days and ate at other on-site alternatives where meat was available. However, total on-site sales did not decrease significantly. Students were less likely to switch to alternatives than staff and guests. A less stringent implementation of a Veggie Day where only beef dishes were removed from the menu, did not result in a significant shift to alternatives but could reduce emissions by up to 51%.

Adults’ beliefs related to reducing red meat consumption: An exploratory study in the province of Quebec, Canada

A significant consumption of red meat is associated with various issues (e.g. public health, sustainability, animal welfare). This exploratory study aims to identify the perceived advantages and disadvantages, perceived approval and disapproval by important others, and perceived barriers and facilitators pertaining to reducing red meat consumption among adults. An online questionnaire based on the Theory of Planned Behaviour was used to elicit the salient beliefs of 55 red meat eaters living in the province of Quebec (Canada). A content analysis performed by two independent coders revealed that the predominant themes (modal beliefs) included health, environment, saving money, food preferences, social influence, perceptions of the alternatives of meat, and efforts related to change. This study can inform the development of interventions aimed at promoting the reduction of red meat consumption.

168 American mink Genome Sequencing Project

Abstract The long-term goal of American Mink (Neogale vison) Genome Sequencing Project is to develop novel genomics tools to study the genome biology and evolution of mink. This research agenda is organized around three major goals: 1) development of first chromosome-level genome assembly with high quality for American mink to help understanding the biology and evolution of the order Carnivora, 2) designing the first mink single nucleotide polymorphism (SNP) genotyping array for genomic discovery in mink, and 3) using genomics to understand the genetic architecture of economically important traits in mink. An initial draft of the genome assembly is generated using 2,884,047 PacBio long reads. Integration of Hi-C data into the initial draft led to an assembly with 183 scaffolds and scaffold N50 of 220 Mb. This gap-free genome assembly of American mink (ASM_NN_V1) has a length of 2.68 Gb in which about 98.6% of the whole genome is covered by 15 chromosomes. Significant improvements are observed in genome contiguity, the number of scaffolds, and annotation compared with the first draft of mink genome assembly. A custom genotyping array is developed using the developed mink reference genome and DNA panel composed of 100 whole-genome sequences data of American mink from five color-types. This Affymetrix Mink 70K SNP array created 70,000 SNPs, which is sufficient for conducting genomic studies in the mink research program and beyond. This project would facilitate the discovery of genomic regions, markers and genetic networks underlying economically important traits in American mink, which will contribute novel insights into the genetic architecture of key traits and is a critical step to implement genomic selection in mink breeding programs. The results of this research have the potential to impact the mink industry, especially in North America, and improve the overall performance of the mink industry.

The primitive giant panda Kretzoiarctos beatrix (Carnivora, Ursidae) from the hominid locality of Hammerschmiede: dietary implications

AbstractExtant giant pandas are among the most herbivorous forms of the order Carnivora, feeding mainly on hard plant material. The first steps of their evolutionary lineage are of particular interest for our understanding of the factors that led to this specialized niche. The present work deals with newly discovered dental material of the primitive ailuropodine bear Kretzoiarctos beatrix from the Late Miocene locality of Hammerschmiede (Germany). This is the first report of the genus Kretzoiarctos outside the Iberian Peninsula, expanding its spatial range to Central Europe. All of the currently known localities with K. beatrix, from both Spain and Germany, are very similar in age (c. 11.9–11.4 Ma). The present material has distinct features that enable its taxonomic discrimination from other Miocene ursids of Europe, such as Ballusia, Ursavus, Miomaci, Agriarctos and Indarctos. A thorough comparison is conducted of all of these forms. The new specimens were used in a dental microwear texture analysis in combination with ecomorphological comparisons, to investigate the dietary habits of this primitive ailuropodine. The results suggest that Kretzoiarctos was not an eater of tough plant material like the extant giant panda but was more similar to the extant Tremarctos, exhibiting opportunistic behaviour with occasional consumption of meat.

The role of vegetarianism, gender, and food choice motivations on vegetable intake among university students

Objective: This study investigated collegians’ (N = 466) vegetable consumption as a function of their food choice motivations, gender, and dietary habits. Method: Vegetarians and vegans (veg*ns, n = 94, 60% women), occasional meat eaters (n = 90, 66% women), and omnivores (n = 282, 43% women) completed the Food Choice Questionnaire and reported frequency of vegetable consumption. Results: Veg*ns consumed vegetables more frequently than omnivores and occasional meat eaters. Veg*ns’ and occasional meat eaters’ food choices were more motivated by natural content, health, and ethics, and less motivated by familiarity compared to omnivores. Women were more motivated than men by weight control. Health concerns predicted vegetable consumption for all dietary groups. Additionally, familiarity predicted veg*ns vegetable consumption, whereas mood, natural content, and convenience predicted omnivores’ vegetable consumption. Conclusions: Individual differences in dietary habits and food choice motivations should be considered when designing strategies to promote healthful diets for university students.

Long-term vegetation succession enhances the network complexity and stability of soil protozoan communities

Long-term vegetation succession is critical for the improvement of environmental quality and the restoration of ecosystem functions. As key links in the micro-food web, protozoa are widespread in the soil and are important participants in nutrient cycling and energy transfer. However, the effects of vegetation succession on soil protozoan communities compared to those on other soil microbial communities, such as bacteria and fungi, remain largely unknown. Here, a long-term vegetation succession sequence of approximately 160 years was selected to investigate the evolutionary characteristics and drivers of soil protozoan diversity, network stability, and community assembly processes. Soil protozoan alpha diversity increased significantly with vegetation succession, and beta diversity differed significantly between early and late successional stages. Microbial biomass is a key driver of soil protozoan diversity. In addition, the network robustness and complexity of soil protozoa increased significantly and stabilized during late successional stages. Soil microbes played a direct role in protozoan network stability, whereas abiotic factors played an indirect role, reflecting the trophic cascade in soil micro-food webs. The relative contributions of deterministic processes to the community assembly of soil protozoa increased progressively with vegetation succession, owing to multiple eco-selective mechanisms arising from environmental changes. Our results highlight the bottom-up effects of soil microbes on secondary consumer communities during natural restoration, providing new insights into the mechanisms underlying the maintenance of soil micro-food web diversity and stability across environmental gradients.

Dynamic modeling and experimental analysis of a novel bionic mantis shrimp robot

AbstractSmall carnivorous marine animals have developed agile movement abilities through long‐term natural selection, resulting in excellent maneuverability and high swimming efficiency, making them ideal models for underwater robots. To meet the requirements for exploring narrow underwater zones, this paper designs an underwater robot inspired by mantis shrimp. By analyzing the body structure and swimming mode of the mantis shrimp, we designed a robot structure and hardware system and established a dynamic model for the coupled motion of multiple pleopods. A series of underwater experiments were conducted to verify the dynamic model and assess the performance of the prototype. The experimental results confirmed the accuracy of the dynamic model and demonstrated that the bionic mantis shrimp robot can perform multiangle turns and flexible velocity adjustments and exhibits good motion performance. This approach provides a novel solution for developing robots suitable for detecting complex underwater environments.

“We can't be too saintly”: Why members of parliament in the United Kingdom are reluctant to lead by example with low-carbon behaviour

Low-carbon behaviour change from individuals is both essential for meeting climate change targets and highly politically contentious. Shifting away from activities such as flying, driving and meat eating can greatly reduce greenhouse gas emissions, yet political leaders have avoided introducing policies to stimulate this for fear of alienating voters and confronting political orthodoxies. This article examines low-carbon behaviour change through the novel lens of individual leadership and leading by example. Applying threories of credibility enhancing displays (CREDs) and embodied leadership, we present evidence from 19 interviews with UK members of parliament (MPs), exploring how they think leading by example may affect their credibility as democratic representatives. We find that MPs believe leading by example is important as a general principle but is problematic when it comes to low-carbon behaviour. While some MPs do deliberately model sustainable behaviours to maintain credibility as climate advocates, they tend to do this quietly for fear of negative reactions from the media, political rivals, and constituents. MPs say modelling low-carbon behaviour may be perceived as a threat to individual freedoms, such as flying for holidays, and risks disapproval from local business interests related to high-carbon activities, such as car manufacturers or the airline industry. Even pro-climate MPs tend to frame low-carbon behaviour as “extreme”, and position themselves in contrast to this extreme, thus perpetuating social and moral norms of high-carbon behaviour. We discuss how individual politicians form part of a systemic resistance to low-carbon behaviour change.

Potential bottom-up and top-down control of large microzooplankton in response to contrasting productive scenarios in the tropical southwestern Atlantic

Large microzooplankton, comprising organisms generally between 64 and 200 μm, plays a significant trophic role in marine ecosystems as primary or secondary consumers. In oligotrophic systems such as the Tropical Southwestern Atlantic, where primary production is dominated by Cyanobacteria, they provide a pivotal link between the basis of food webs and higher trophic levels. In this region, seasonal variations in circulation and continental runoff and wind mixing induce heightened phytoplankton biomass during autumn when compared to a less productive scenario observed in spring, leading to increased abundances of higher trophic levels. In order to establish the connection between primary producers and these higher trophic levels, we investigated the dynamics of large microzooplankton abundance in response to variations in phytoplankton biomass across different systems in the Tropical Southwestern Atlantic. Our findings highlight the complex interactions between bottom-up and top-down control mechanisms that shape large microzooplankton assemblages in these ecosystems. The increase in primary production was accompanied by an observable increase in the abundances of large microzooplankton organisms over the continental shelf, thereby supporting the hypothesis of bottom-up control. In contrast, offshore, in the South Equatorial Current System, a lower abundance of large microzooplankton was observed in the more productive scenario. The intricate relationships between large microzooplankton and higher trophic levels, particularly planktonic cnidarians, appear to be a key driver of these contrasting patterns. The presence of voracious gelatinous predators in the offshore systems, suggests a scenario in which top-down predation may counteract the expected bottom-up response of large microzooplankton to increased phytoplankton biomass. This indicates the importance of considering the entire trophic web when analysing the responses of large microzooplankton to changes in primary production.

Three-dimensional geometric morphometric analyses of humerus ecomorphology: New perspectives for paleohabitat reconstruction in carnivorans and ungulates.

Long bone ecomorphology has proven effective for paleohabitat reconstructions across a wide range of mammalian clades. Still, there is no comprehensive framework to allow interpretation of long bone morphological variation within and between different monophyletic groups. Here, we investigated the use of humerus morphometry to classify living members of the orders Carnivora and ungulates based on their preferred habitats. Using geometric morphometrics, we extracted three different kinds of humerus shape data describing interspecific variation with and without accounting for evolutionary allometry and phylogenetic signal. The traditional a priori categorization of species in open, mixed, and closed habitats was employed in combination with selected subsets of shape variables to identify the best-predictive models for habitat adaptation. These were identified based on the statistical performance of phylogenetic and non-phylogenetic discriminant analyses and then applied to predict habitats on a subsample of fossil species. Size-free shape data combined with phylogenetic discriminant analyses showed the highest rate of accuracy in habitat classification for a combined sample of carnivorans and ungulates. Conversely, when the two groups were investigated separately, traditional shape data analyzed with phylogenetic discriminant function analyses provided models with the greatest predictive power. By combining carnivorans and ungulates within the same methodological framework we identified common adaptive features in closed habitat-adapted species that show compressed epiphyses, while open habitat-adapted species have expanded epiphyses. These morphologies evolved to allow significant degree of direction switches during locomotion in closed habitats compared to open habitat-adapted species whose forelimb joints evolved to stabilize articulations for increasing speed.