Arctic WEB

a multidisciplinary arctic research network

  RESEARCH QUESTIONS

The research questions listed below are questions we recently raised based on last winter brainstorming in Qu├ębec. Those questions are listed to stimulate reflexion and collaboration and should be improved. Other ideas are welcome.

1. 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 etc. from models based on empirical data
  Mapping arctic biodiversity vulnerability
Approach 1: collecting empirical information and develop food-webs
Approach 2: Niche modelling
2. Impact of climate change on top-down and bottom-up forces
  Biochemical cycles
  Primary production
  Number of functional groups
  Demography
  Interaction strength
Approach: theoretical modelling
3. Effect 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
4. Develop new food-web models to precise the effect 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)
5. 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)
6. Effect of phenology (food resources and predation) on top-down and bottom-up control
Approach 1: theoretical modelling (cf. 4.1)
Approach 2: experimental manipulation of food abundance and predation pressure resource phenology + predation (nests exclosures AND food supplementation regarding with peak 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

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