Andréanne Beardsell

Université du Québec à Rimouski UQAR | uqar · Département de Biologie, Chimie et Géographie

Physical characteristics of nest sites are thought to influence their use by birds and the outcome of breeding attempts. The presence of preexisting nesting structures can also be an important factor influencing reuse patterns and reproductive success. We examined the relationships between nest-site physical characteristics, patterns of nest reuse,...

The functional response is at the core of any predator-prey interactions as it establishes the link between trophic levels. The use of inaccurate functional response can profoundly affect the outcomes of population and community models. Yet most functional responses are evaluated using phenomenological models which often fail to discriminate among...

Predation shapes communities through consumptive and non‐consumptive effects. In the latter case, prey respond to perceived predation risk through proactive or reactive risk management strategies occurring at different spatial and temporal scales. The predator–prey space race and landscape of fear concepts are useful to better understand how predat...

Prey handling processes are considered a dominant mechanism leading to short‐term positive indirect effects between prey that share a predator. However, a growing body of research indicates that predators are not necessarily limited by such processes in the wild. Density‐dependent changes in predator foraging behavior can also generate positive ind...

The effects of indirect biotic interactions on species occurrence are difficult to quantify in the wild. In theory, the exclusion of a prey species can occur through the numerical and functional responses of a predator to another prey. Few studies assessed the relative effects of these responses on the net interaction strength between multiple prey...

1. A bstract Prey handling processes are considered a key driver of short-term positive indirect effects between prey sharing the same predator. However, a growing body of research indicates that predators are rarely limited by such processes in the wild. Density-dependent changes in predator foraging be-havior can also generate positive indirect...

The functional response is central to our understanding of any predator–prey system as it establishes the link between trophic levels. Most functional responses are evaluated using phenomenological models linking predator acquisition rate and prey density. However, our ability to measure functional responses using such an approach is often limited...

Predation shapes communities through consumptive and non-consumptive effects, where in the latter prey respond to perceived predation risk through risk management strategies occurring at different spatial and temporal scales. The landscape of fear concept is useful to better understand how predation risk affects prey behavioral decisions and distri...

Climate change can affect the distribution, abundance, and phenology of organisms globally. Variations in the timing of passage during autumn and spring migration can have consequences at individual and population levels. We assessed whether global climatic indexes and increasing air temperature over a 28 yr period were concurrent with shifts in th...

Increase in temperature and precipitation associated with climate change may enhance the risk of destruction by geomorphological processes of nests or dens used by Arctic wildlife. We assessed nest vulnerability to mass movements and identified environmental factors associated with the persistence of nesting structures of rough-legged hawks (Buteo...

Migratory raptors play a key role in the tundra ecosystem and contribute to the regulation of small mammal populations. Changes in their abundance or distribution could have important consequences on the tundra food web but the monitoring of these species is often hindered because of their low density and long-distance movements. Technological adva...

Permafrost thawing and increase in precipitation due to climate warming may augment the vulnerability of nesting structures to slope processes related hazards resulting in habitat loss for arctic-breeding birds. It is therefore important to better understand how environmental factors influence nesting structures stability as well as nest use and re...

Les changements climatiques affectent les géosystèmes périglaciaires de façon plus accentuée que partout ailleurs sur la planète. La hausse de températures de l’air sera, selon les modèles de circulation générale, plus rapide que dans les autres zones bioclimatiques extra-circumpolaires. En raison de la glace dans le sol appelée à fondre lors du dé...

Avian predators like the rough-legged hawk (Buteo lagopus) play a key role in the Arctic food web. This migratory bird, which has a circumpolar distribution, breeds on cliffs, hoo-doos or on steep hillsides in the tundra. Nest-sites are an important resource and their availability may limit the distribution, density and breeding success of raptors....