
Angelique DupuchUniversité du Québec en Outaouais · Département des sciences naturelles
Angelique Dupuch
PhD
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15
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Publications (15)
Au Québec, comme dans de nombreux pays du monde, la surface couverte par les milieux humides et les forêts diminuent. Ces diminutions sont les premières causes d’érosion de la biodiversité, rapprochant notre monde d’une sixième extinction de masse. DOMTAR, la plus grande productrice de pâtes à papier et dérivés d’Amérique du Nord, s’emploie depuis...
Asymmetrical interspecific competition among top predators can indirectly affect the predation risk for their prey by altering the abundance, diet, and habitat use of inferior competitors. However, the indirect effects of such biological interactions are poorly known because of the difficulties in measuring predation risk in nature. We addressed th...
Ecosystem-based management has taken a central role in the conservation of animal populations in managed landscapes. A fundamental assumption of ecosystem-based management by the emulation of natural disturbances is that logging practices would protect biodiversity by maintaining key ecosystem properties. The hypothesis, however, needs to be tested...
Prey living in risky environments can adopt a variety of behavioral tactics to reduce predation risk. In systems where predators regulate prey abundance, it is reasonable to assume that differential patterns of habitat use by prey species represent adaptive responses to spatial variation in predation. However, patterns of habitat use also reflect i...
In systems where predation plays a key role in the dynamics of prey populations, such as in Arctic rodents, it is reasonable to assume that differential patterns of habitat use by prey species represent adaptive responses to spatial variation in predation. However, habitat selection by collared (Dicrostonyx groenlandicus) and brown (Lemmus trimucro...
As human activities increase landscape fragmentation, edge effects on ecosystem properties are growing at an unprecedented rate. The influence of logging-induced edges on biodiversity can ultimately jeopardize the long-term sustainability of forest management practices. These effects are difficult to quantify, however, because temporal changes in e...
Minnow traps are widely used in aquatic ecology for the quantitative sampling of small-bodied fish. We used paired sampling stations to compare the catch efficiency of minnow traps constructed of galvanized steel with that of traps constructed of steel mesh covered with a black vinyl coating in field and laboratory conditions. Except for northern r...
The conservation and understanding of biodiversity requires development and testing of models that illustrate how climate change and other anthropogenic effects alter habitat and its selection at different spatial scales. Models of fitness along a habitat gradient illustrate the connection between fine-scale variation in fitness and the selection o...
The effects of predation risk and habitat complexity on the efficiency of minnow traps to catch northern redbelly dace Chrosomus eos in laboratory experiments were investigated. Trap efficiency significantly decreased in the presence of vegetation and predators. These results suggest that the various antipredator behaviours used by prey fishes can...
Competition between coexisting species existing near their stable equilibrium can be obscured if they occupy separate habitats. Theories of habitat selection promise an ability to reveal the underlying ghost of competition by using isodars to infer the behavioural map of habitat selection. We tested the theory with two years of data on abundance an...
The northern redbelly dace, Phoxinus eos (Cope, 1862), is subject to predation by brook trout, Salvelinus fontinalis (Mitchill, 1814), in Canadian Shield lakes, particularly when individuals migrate to the pelagic zone at sunset to feed on zooplankton and fish shoals break up into single individuals. The objectives of the present study were to (i)...
Ecologists and evolutionary biologists must develop theories that can predict the consequences of global warming and other impacts on Earth's biota. Theories of adaptive habitat selection are particularly promising because they link distribution and density with fitness. The evolutionarily stable strategy that emerges from adaptive habitat choice i...
Background / Purpose:
The long-term success of conservation planning depends on its success at anticipating ecological and evolutionary adjustments to habitat change. Both types of adjustments emerge from underlying theories of density-dependent habitat selection. The densities of individuals living in alternative habitats represent current strat...
Theoretical models have extended the Ideal Free Distribution model to examine predator–prey systems having three trophic levels, when both predator and prey are allowed to move freely. One consistent prediction made by such models is that the spatial distribution of prey should be mainly determined by the inherent habitat riskiness (e.g. cover leve...
This study investigated the relationship between spatial variations in predation risk and abundance of northern redbelly dace Phoxinus eos at both macroscale (littoral v. pelagic zones) and microscale (structured v. open water habitats in the littoral zone) of Canadian Shield lakes. Minnow traps were placed in both structured and open water habitat...