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34 results for “Prey density”
Prey and predator density-dependent interactions under different water volumes
<p>Predation is a critical ecological process that directly and indirectly mediates population stabilities, as well as ecosystem structure and function. The strength of interactions between predators and prey may be mediated by multiple density-dependences concerning numbers of predators and prey. In temporary wetland ecosystems in particular, fluctuating water volumes may alter predation rates through differing search space and prey encounters rates. Using a functional response approach, we examined the influence of predator and prey densities on interaction strengths of the temporary pond specialist copepod <i>Lovenula raynerae </i>preying on cladoceran prey, <i>Daphnia pulex</i>, under contrasting water volumes. Further, using a population dynamic modelling approach, we quantified multiple predator effects across differences in prey density and water volume. Predators exhibited Type II functional responses under both water volumes, with significant antagonistic multiple predator effects (i.e. antagonisms) exhibited overall. The strengths of antagonistic interactions were, however, enhanced under reduced water volumes and at intermediate prey densities. These findings indicate important biotic and abiotic contexts that mediate predator-prey dynamics, whereby multiple predator effects are contingent on both prey density and search area characteristics. In particular, reduced search areas (i.e., water volumes) under intermediate prey densities could enhance antagonisms by heightening predator-predator interference effects.</p>
Density survey of apex predators, their main prey and human disturbance in the eastern Central African Republic
<p>Summary of all density estimates as described in Aebischer et al. 2020, Biological Conservation.</p>
Prey density affects predator foraging strategy in an Antarctic ecosystem
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Data from: Decreasing predator density and activity explain declining predation of insect prey along elevational gradients
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Data from: Size-selectivity of predation by brown bears depends on the density of their sockeye salmon prey
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Data from: Intensity of space use reveals conditional sex-specific effects of prey and conspecific density on home range size
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Data from: Understanding spatial distributions: negative density-dependence in prey causes predators to trade-off prey quantity with quality
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Prey and predator density-dependent interactions under different water volumes
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Data from: Habitat monitoring and projections for threatened Canada lynx: linking the Landsat archive with carnivore occurrence and prey density
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Data from: Interactive effects of predation risk and conspecific density on the nutrient stoichiometry of prey
The mere presence of predators (i.e., predation risk) can alter consumer physiology by restricting food intake and inducing stress, which can ultimately affect prey-mediated ecosystem processes such as nutrient cycling. However, many environmental factors, including conspecific density, can mediate the perception of risk by prey. Prey conspecific density has been defined as a fundamental feature that modulates perceived risk. In this study, we tested the effects of predation risk on prey nutrient stoichiometry (body and excretion). Using a constant predation risk, we also tested the effects of varying conspecific densities on prey responses to predation risk. To answer these questions, we conducted a mesocosm experiment using caged predators (Belostoma sp.), and small bullfrog tadpoles (Lithobates catesbeianus) as prey. We found that L. catesbeianus tadpoles adjust their body nutrient stoichiometry in response to predation risk, which is affected by conspecific density. We also found that the prey exhibited strong morphological responses to predation risk (i.e., an increase in tail muscle mass), which were positively correlated to body nitrogen content. Thus, we pose the notion that in risky situations, adaptive phenotypic responses rather than behavioral ones might partially explain why prey might have a higher nitrogen content under predation risk. In addition, the interactive roles of conspecific density and predation risk, which might result in reduced perceived risk and physiological restrictions in prey, also affected how prey stoichiometry responded to the fear of predation.
Temporal changes in predator density are linked to shifts in prey behavior, mortality, and abundance in the field
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Data from: Interactive effects of predation risk and conspecific density on the nutrient stoichiometry of prey
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Data from: An adaptable but threatened big cat: density, diet and prey selection of the Indochinese leopard (Panthera pardus delacouri) in eastern Cambodia
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Data from: Effects of prey density, temperature and predator diversity on nonconsumptive predator-driven mortality in a freshwater food web
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.