Diet composition and foraging success in generalist predators: Are specialist individuals better foragers?

[EN]: Factors affecting individual diet specialization in generalist populations and the relationship between diet and foraging success remain poorly studied, particularly in terrestrial wide-ranging predators. We studied whether individual variations in diet in Montagu's harrier males (determined through a combination of direct foraging observations and pellet analysis) were associated with patterns of foraging habitat selection and foraging success of 12 radiotracked males during the breeding period. We found important differences in diet composition and breadth between individuals. Diet diversity was negatively related to hunting success: the most efficient individuals in terms of hunting success had the most specialized diet. This study also suggests an important role of individual foraging habitat selection in explaining individual diet, as the proportion of different prey types in the diet was associated with habitat composition within the home range, with higher proportion of those habitats that held higher abundances of their more frequent prey. This study thus provides evidence of individual diet specialization having a knock-on effect on foraging efficiency in a wide-ranging raptor and highlights the role of individual behaviour as a driving force of intra-population niche variation.The authors would like to thank the Centre Tecnològic Forestal de Catalunya for financial and logistic support. BA was supported by a Mobility Grant funded by the Spanish Ministry of Education and Culture (Salvador de Madariaga call, grant number PRX12/00181) while working on this paper in CEBC.Peer Reviewe

Strengthening protected areas to halt biodiversity loss and mitigate pandemic risks

The current COVID-19 pandemics is having a major impact on our global health and economies. There is widespread recognition that ecosystem disruption, including land-use change and illegal wildlife trade, is linked to the increasing emergence of zoonotic diseases. Here, we emphasize that protected areas play a fundamental role in buffering against novel disease outbreaks by maintaining ecosystem integrity. However, protected areas worldwide are facing increasing human pressures, which are being amplified by the unfolding COVID-19 crisis. Increased resources are thus urgently needed to mainstream a One Health approach to protected area management, focusing specifically on i) monitoring illegal wildlife trade, ii) biodiversity trends and iii) surveillance of zoonotic pathogens. Improving integration of public health into global biodiversity conservation policies should be a top priority to reduce the risk of future pandemics.Peer reviewe

The role of protected areas in supporting human health : a call to broaden the assessment of conservation outcomes

Ongoing global biodiversity loss has far-reaching consequences for human health and well-being. While protected areas (PAs) have become a major policy instrument for biodiversity conservation, their role in supporting human health remains unclear. Here, we synthesize both positive and negative aspects of PAs on different dimensions of human health and provide several theoretical advances to assess the effectiveness of PAs in promoting human health. We finally identify three major research gaps requiring urgent attention. Implementing an interdisciplinary research program remains a priority to better comprehend the linkages between human health, ecosystem services and conservation policies at global scale. We believe this is key to improve the management of PAs and their surrounding areas and foster co-benefits for biodiversity and human health.Peer reviewe

Using satellite telemetry and environmental niche modelling to inform conservation targets for a long-distance migratory raptor in its wintering grounds

Understanding the ecology of migratory birds during the non-breeding season is necessary for ensuring their conservation. Using satellite telemetry data we describe winter ranging behaviour and movements of pallid harriers Circus macrourus that bred in Kazakhstan. We developed an ecological niche model for the species in Africa, to identify the most suitable wintering areas for pallid harriers and the importance of habitat in determining the location of those areas. We also assessed how well represented suitable areas are in the network of protected areas. Individual harriers showed relatively high fidelity to wintering areas but with potential for interannual changes. The ecological niche model highlighted the importance of open habitats with natural vegetation. Most suitable areas for the species were located in eastern Africa. Suitable areas had a patchy distribution but were relatively well included in the network of protected areas. The preferential use of habitats with natural vegetation by wintering pallid harriers and the patchiness of the most suitable areas highlight the harrier's vulnerability to land-use changes and the associated loss of natural vegetation in Africa. Conservation of harriers could be enhanced by preserving natural grasslands within protected areas and improving habitat management in the human-influenced portions of the species' core wintering areas.We thank to the Natural Research Ltd for funding. R. Limiñana benefited from a postdoctoral grant (reference 10/12-C) co-funded by ‘Consejería de Educación y Ciencia’ and the European Social Fund.Peer Reviewe

Using satellite telemetry and environmental niche modelling to inform conservation targets for a long-distance migratory raptor in its wintering grounds

Understanding the ecology of migratory birds during the non-breeding season is necessary for ensuring their conservation. Using satellite telemetry data we describe winter ranging behaviour and movements of pallid harriers Circus macrourus that bred in Kazakhstan. We developed an ecological niche model for the species in Africa, to identify the most suitable wintering areas for pallid harriers and the importance of habitat in determining the location of those areas. We also assessed how well represented suitable areas are in the network of protected areas. Individual harriers showed relatively high fidelity to wintering areas but with potential for interannual changes. The ecological niche model highlighted the importance of open habitats with natural vegetation. Most suitable areas for the species were located in eastern Africa. Suitable areas had a patchy distribution but were relatively well included in the network of protected areas. The preferential use of habitats with natural vegetation by wintering pallid harriers and the patchiness of the most suitable areas highlight the harrier's vulnerability to land-use changes and the associated loss of natural vegetation in Africa. Conservation of harriers could be enhanced by preserving natural grasslands within protected areas and improving habitat management in the human-influenced portions of the species’ core wintering areas.R. Limiñana benefited from a postdoctoral grant (reference 10/12-C) co-funded by ‘Consejería de Educación y Ciencia’ and the European Social Fund

Imprinting and flexibility in human face cognition

Faces are an important cue to multiple physiological and psychological traits. Human preferences for exaggerated sex typicality (masculinity or femininity) in faces depend on multiple factors and show high inter-subject variability. To gain a deeper understanding of the mechanisms underlying facial femininity preferences in men, we tested the interactive effect of family structure (birth order, sibling sex-ratio and number of siblings) and parenthood status on these preferences. Based on a group of 1304 heterosexual men, we have found that preference for feminine faces was not only influenced by sibling age and sex, but also that fatherhood modulated this preference. Men with sisters had a weaker preference for femininity than men with brothers, highlighting a possible effect of a negative imprinting-like mechanism. What is more, fatherhood increased strongly the preference for facial femininity. Finally, for fathers with younger sisters only, the more the age difference increased between them, the more femininity preference increased. Overall our findings bring new insight into how early-acquired experience at the individual level may determine face preference in adulthood, and what is more, how these preferences are flexible and potentially dependent on parenthood status in adult men.Peer reviewe

Principles for including conservation messaging in wildlife‐based tourism

1. There is growing evidence that wildlife-based tourism can be a valuable pathway to transform the environmental knowledge, attitudes and behaviours of tourists, if complemented by effective conservation messaging and proactive interpretive experiences. 2. Yet, such conservation messaging is not always a priority for many wildlife-based tourism operators, who often avoid exposing happy tourists to the daunting biodiversity crisis. In this paper, we argue that failing to encourage tourists to do more on behalf of wildlife represents a missed opportunity for conservation. 3. Based on a comprehensive review of the academic literature, we show that conservation messaging is virtually absent from many mainstream wildlife-based tourism operations, often failing to connect global audiences to conservation issues. 4. We found that the scholarly literature on the effectiveness of different techniques, approaches and contents of conservation messaging in wildlife-based tourism is meagre at best. Yet, alternative forms of communicating conservation-related messages are opening new avenues to broaden the conservation potential of wildlife-based tourism. 5. We suggest a set of principles for improving the implementation of conservation messaging in wildlife-based tourism operations in order to maximize their educational potential. We end by calling for further research efforts on the factors implicated in effective conservation messaging in wildlife-based tours in order to pave the way for a new era of conservation-oriented tourismPeer reviewe

Imprinting and flexibility in human face cognition

Faces are an important cue to multiple physiological and psychological traits. Human preferences for exaggerated sex typicality (masculinity or femininity) in faces depend on multiple factors and show high inter-subject variability. To gain a deeper understanding of the mechanisms underlying facial femininity preferences in men, we tested the interactive effect of family structure (birth order, sibling sex-ratio and number of siblings) and parenthood status on these preferences. Based on a group of 1304 heterosexual men, we have found that preference for feminine faces was not only influenced by sibling age and sex, but also that fatherhood modulated this preference. Men with sisters had a weaker preference for femininity than men with brothers, highlighting a possible effect of a negative imprinting-like mechanism. What is more, fatherhood increased strongly the preference for facial femininity. Finally, for fathers with younger sisters only, the more the age difference increased between them, the more femininity preference increased. Overall our findings bring new insight into how early-acquired experience at the individual level may determine face preference in adulthood, and what is more, how these preferences are flexible and potentially dependent on parenthood status in adult men

Demographic history, genetic structure and gene flow in a steppe-associated raptor species

<p>Abstract</p> <p>Background</p> <p>Environmental preferences and past climatic changes may determine the length of time during which a species range has contracted or expanded from refugia, thereby influencing levels of genetic diversification. Connectivity among populations of steppe-associated taxa might have been maximal during the long glacial periods, and interrupted only during the shorter interglacial phases, potentially resulting in low levels of genetic differentiation among populations. We investigated this hypothesis by exploring patterns of genetic diversity, past demography and gene flow in a raptor species characteristic of steppes, the Montagu's harrier (<it>Circus pygargus</it>), using mitochondrial DNA data from 13 breeding populations and two wintering populations.</p> <p>Results</p> <p>Consistent with our hypothesis, Montagu's harrier has relatively low genetic variation at the mitochondrial DNA. The highest levels of genetic diversity were found in coastal Spain, France and central Asia. These areas, which were open landscapes during the Holocene, may have acted as refugia when most of the European continent was covered by forests. We found significant genetic differentiation between two population groups, at the SW and NE parts of the species' range. Two events of past population growth were detected, and occurred ca. 7500-5500 and ca. 3500-1000 years BP in the SW and NE part of the range respectively. These events were likely associated with vegetation shifts caused by climate and human-induced changes during the Holocene.</p> <p>Conclusions</p> <p>The relative genetic homogeneity observed across populations of this steppe raptor may be explained by a short isolation time, relatively recent population expansions and a relaxed philopatry. We highlight the importance of considering the consequence of isolation and colonization processes in order to better understand the evolutionary history of steppe species.</p