Sandra Lai

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

PhD

About

25
Publications
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397
Citations
Introduction
Sandra Lai currently works at the Département de Biologie, Chimie et Géographie, Université du Québec à Rimouski UQAR.

Publications

Publications (25)
Article
Full-text available
Animal migration contributes largely to the seasonal dynamics of High Arctic ecosystems, linking distant habitats and impacting ecosystem structure and function. In polar deserts, Arctic hares are abundant herbivores and important components of food webs. Their annual migrations have long been suspected, but never confirmed. We tracked 25 individua...
Article
Rapid range expansion of boreal forest predators onto the tundra may disrupt local ecological processes, notably through competition with ecologically similar species. Red foxes (Vulpes vulpes) have expanded their range northwards throughout the Canadian Arctic, inducing competition with endemic Arctic foxes (V. lagopus). We studied competition bet...
Article
Full-text available
Caribou and reindeer migrations are the tip of the iceberg when one considers migration among the 70 species of Arctic terrestrial mammals. About 26% of species indeed have migratory individuals, while 33% are non-migratory and 41% are data deficient. Such figures demonstrate the need to both better document and better understand seasonal movements...
Poster
Full-text available
Long-distance movements undertaken by animals are among the most fascinating biological phenomena on Earth. They include dispersal to reach new breeding sites, predictable migrations, and various forms of resource-based nomadism. About 12% of vertebrate species undertake large-scale migrations, but because the costs of terrestrial locomotion are hi...
Article
Full-text available
The startling warming of the Arctic is driving important environmental changes, but vegetation responses have been spatially heterogeneous and difficult to predict. In this context, establishing new ecological baselines and initiating monitoring schemes are essential. We conducted systematic plot-based surveys in the polar desert surrounding Alert...
Article
Full-text available
Long-term monitoring is critical to guide conservation strategies and assess the impacts of climatic changes and anthropogenic activities. In High Arctic ecosystems, information on distribution and population trends of plants is dramatically lacking. During two field expeditions in 2018 and 2019, we conducted a systematic floristic survey together...
Article
Full-text available
The Arctic is entering a new ecological state, with alarming consequences for humanity. Animal-borne sensors offer a window into these changes. Although substantial animal tracking data from the Arctic and subarctic exist, most are difficult to discover and access. Here, we present the new Arctic Animal Movement Archive (AAMA), a growing collection...
Article
Full-text available
The Arctic is entering a new ecological state, with alarming consequences for humanity. Animal-borne sensors offer a window into these changes. Although substantial animal tracking data from the Arctic and subarctic exist, most are difficult to discover and access. Here, we present the new Arctic Animal Movement Archive (AAMA), a growing collection...
Article
Full-text available
As top or mesopredators, carnivores play a key role in food webs. Their survival and reproduction are usually thought to be influenced by prey availability. However, simultaneous monitoring of prey and predators is difficult, making it challenging to evaluate the impacts of prey on carnivores’ demography. Using 13 years of field data on arctic foxe...
Poster
Full-text available
Managing species at risk and their critical habitats is challenging in situations where information is scarce, such as is often the case in the Arctic. Remote sensing provides a lot of information simply by the acquisition of images of the surface of the Earth. Recently, the increased efficiency of airborne and satellite sensors has facilitated the...
Preprint
Full-text available
Camera traps now represent a reliable, efficient and cost-effective technique to monitor wildlife and collect biological data in the field. However, efficiently extracting information from the massive amount of images generated is often extremely time-consuming and may now represent the most rate-limiting step in camera trap studies. To help overco...
Poster
Full-text available
Bien que la toundra arctique demeure majoritairement non perturbée par les activités humaines directes, offrant des opportunités uniques de préserver son intégrité écologique, l’intensification des perturbations humaines est évidente et générera le besoin de développer des Plans de Gestion de la Biodiversité (PGB). De tels plans ont été proposés da...
Technical Report
Full-text available
We present several methods that can be used to monitor Arctic and red foxes in the Arctic tundra, with a focus on breeding activities. We highlight the pros and cons of each method.
Article
Full-text available
Objective The arctic fox (Vulpes lagopus) is a circumpolar species inhabiting all accessible Arctic tundra habitats. The species forms a panmictic population over areas connected by sea ice, but recently, kin clustering and population differentiation were detected even in regions where sea ice was present. The purpose of this study was to examine t...
Article
Full-text available
The sociality of the Arctic fox has been extensively studied during the breeding season, so that its summer territorial and generally monogamous social systems are now well described. A key knowledge gap remains, however, during the winter season, when logistic challenges preclude detailed observation of individuals. We have studied the socio-spati...
Article
Animal movement is a fundamental process shaping ecosystems at multiple levels, from the fate of individuals to global patterns of biodiversity. The spatio-temporal dynamic of food resources is a major driver of animal movement and generates patterns ranging from range residency to migration and nomadism. Arctic tundra predators face a strongly flu...
Article
Full-text available
Identifying correctly trophic interactions is important for understanding population dynamics and ecosystem functioning. However, some predator–prey relationships may still remain undetected, due to the difficulty of observing rare predation events. We report the first observation of predation of arctic fox (Vulpes lagopus) pups by common ravens (C...
Article
Full-text available
Background The scale at which animals perceive their environment is a strong fitness determinant, yet few empirical estimates of animal detection ranges exist, especially in mammalian predators. Using daily Argos satellite tracking of 26 adult arctic foxes (Vulpes lagopus) during a single winter in the High Canadian Arctic, we investigated the dete...
Article
Full-text available
Arctic wildlife is often presented as being highly at risk in the face of current climate warming. We use the long-term (up to 24 years) monitoring records available on Bylot Island in the Canadian Arctic to examine temporal trends in population attributes of several terrestrial vertebrates and in primary production. Despite a warming trend (e.g. c...
Article
Swarming is a type of social motility allowing the migration of highly differentiated bacterial cells. Swarming shares many similarities with biofilm communities, which are notable for their high resistance to antimicrobial agents. We investigate here if the swarming behaviour could also be associated with a widespread antimicrobial resistant pheno...

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