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ArcticWEB

A Multi-disciplinary Arctic Research Network

  Research Questions

  Communities and ecosystem vulnerability to climate change

  Impact of the arrival or retreat of new species on ecosystem functioning (identify keystone species)
Approach: tests on stability from models based on empirical data

  Mapping arctic biodiversity vulnerability
Approach 1: collecting empirical information and develop food webs
Approach 2: species niche modelling

  Impacts of climate change on top-down and bottom-up forces

  Biochemical cycles

  Primary production

  Number of functional groups

  Demography

  Interaction strength
Approach: theoretical modelling

  Effects of allochthonous subsidies on top-down and bottom-up forces

  Absolute or relative biomass
Approach 1: theoretical modelling (to generate predictions)
Approach 2: empiral tests

  Develop new food web models to precise the effects of global change on ecosystem functioning and/or trophic interactions dynamic

  Including seasonality
Approach: analyses of long-term series with a latent variable theoretical (cf. epidemiology)

  Including migration and carry-over effects
Approach: empirical models from long-term series (e.g. Bylot Island)

  Net effect of direct and indirect interactions between species with preys sharing a common predator

Approach 1: theoretical modelling (to generate predictions)
Approach 2: empirical observations and experimental tests along a gradient of abundance of prey species
Approach 3: artificial nests experiment
Study species: fox, lemming, geese (alternative prey) and shorebirds (accidental preys)

  Effects of phenology (food resources and predation) on top-down and bottom-up control

Approach 1: theoretical modelling
Approach 2: experimental manipulation of food abundance and predation pressure resource phenology + predation (nests exclosures and food supplementation regarding with peak of arthropod abundance)
Study species: arthropods and insectivorous birds (Lapland longspur). Possibility to extend this at multiple sites to have great ranges in arthropods phenology and abundance