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Henden, John-André

Arktisk og marin biologi




Population and Community Dynamics

Trophic and Foodweb Interactions (consumer-resource dynamics)


*** SUSTAIN -  Sustainable management of renewable resources in a changing environment:
an integrated approach across ecosystems

Overall objective: Develop a framework for sustainable ecosystem based management of harvested ecosystems under a changing environment, promoting ecosystem resilience to climatic changes as well as other stressors and their interactions.
Secondary goals: i) develop foodweb models incorporating demographic structure to improve understanding of ecosystem resilience and develop better demographic harvest strategies, ii) develop improved multispecies harvesting models including environmental stochasticity, iii) increase our knowledge of ecosystem resilience to develop better harvesting strategies in spatially and seasonally structured environments, iv) investigate how climate change in combination with harvesting affects foodweb interactions and ecosystem functions, and v) implement the knowledge in a strategic foresight protocol, in close collaboration with user panels of managers.


*** The arctic fox project (Homepage):

Main objectives:

Perform an integrated management- and researchproject with the intention to:

  • Strengthen the potetial for a viable population of Arctic fox in Finnmark by reducing  the density and distribution of Red fox, in an aim to free potential Arctic fox habitats on the Varanger peninsula – probably the current core area of Arctic fox in Finnmark.
  • Evaluate the effectiveness and impact of Red fox dessimation.
  • Elucidate important aspects of the function of Red fox in the mountain ecosystem, including it's role as a potential competitor, for resources and habitat, for the Arctic fox.
  • Unveil the ecosystem conditions necessary for a viable Arctic fox population in Finnmark, especially with respect to access to food resources and competition with other species.
  • Establish a long-term strategy for the monitoring and conservation of Arctic fox in Finnmark.


*** Climate-ecological Observatory for Arctic Tundra (COAT):

COAT aims to be a fully ecosystem-based system for long-term adaptive monitoring based on a food web approach. A food web approach in context of adaptive monitoring confers several advantages. First, the system is strongly embedded in fundamental ecological theory. This allows the formulation of conceptual climate impact prediction models for tractable modules (compartments) of the food web which will act as a guide for defining adequate monitoring targets and state variables. Second, the comprehensive food web approach taken by COAT, with 7 modules and derived prediction models, accommodate the anticipated climate change impact on tundra ecosystems. Anticipated impacts include (1) “Arctic greening” due to encroachment of forest and tall shrubs and its resultant feedback to the ecosystem and climate system, (2) disrupted dynamics and changed abundance levels of arctic key-stone herbivores and the resultant trophic cascades likely to compromise main ecosystem functions and endemic arctic diversity, and (3) emergence of pest species outbreaks, zoonoses and invasive southern species and assessment of the consequent impacts. Third, the adopted food web approach of COAT should be sufficiently comprehensive to also accommodate early detection of unforeseen events that follow the development of new climates and ecosystems. COAT has a special focus on targets that provide important provisioning and cultural ecosystem services locally (e.g. game), as well as supporting services (e.g. for the climate system) and iconic value (e.g. endemic arctic species) globally. Finally, by embracing the novel paradigm of adaptive monitoring, COAT meets the dual requirements of scientific robustness and societal relevance. Consequently COAT includes routines for involving policy makers and  managers in order to provide a scientifically robust basis for decision making and  implementation of actions, and to ensure their feedback into COAT. According to the adaptive  protocol COAT will iteratively adjust prediction models and monitoring designs as new scientific  knowledge and new research and monitoring technologies become available.

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BIO-3013 Nordlige næringsnetts økologi. Tar utgangspunkt i rammeverket for næringsnett for å forstå økosystemers struktur og funksjon. Tar utgangspunkt i veletablert økologisk teori for trofiske interaksjoner (produsent-forbruker relasjoner) mellom planter, plantespisere og kjøttetere.

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