Blar i NINA Brage på forfatter "Töpper, Joachim Paul"
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Advancing restoration ecology: A new approach to predict time to recovery
Rydgren, Knut; Halvorsen, Rune; Töpper, Joachim Paul; Auestad, Inger; Hamre, Liv Norunn; Jongejans, Eelke; Sulavik, Jan (Journal article; Peer reviewed, 2018)1. Species composition is a vital attribute of any ecosystem. Accordingly, ecological restoration often has the original, or “natural,” species composition as its target. However, we still lack adequate methods for predicting ... -
How to induce defense responses in wild plant populations? Using bilberry (Vaccinium myrtillus) as example
Seldal, Tarald; Hegland, Stein Joar; Rydgren, Knut; Rodriguez-Saona, Cesar; Töpper, Joachim Paul (Journal article; Peer reviewed, 2017)Inducible plant defense is a beneficial strategy for plants, which imply that plants should allocate resources from growth and reproduction to defense when herbivores attack. Plant ecologist has often studied defense ... -
Kartlegging av naturtyper som bidrar med blomsterressurser og larvesubstrater til pollinerende insekter i Norge
Sydenham, Markus Arne Kjær; Myklebost, Heidi; Jokerud, Mari; Singsaas, Frode Thomassen; Töpper, Joachim Paul; Hanssen, Oddvar (NINA Rapport;2383, Research report, 2023)Sydenham, M.A.K., Myklebost, H., Jokerud, M., Singsaas, F.T., Töpper, J.P. & Hanssen, O. 2023. Kartlegging av naturtyper som bidrar med blomsterressurser og larvesubstrater til pollinerende insekter i Norge. NINA Rapport ... -
Miljøovervåkingsprogram for Ormen Lange landanlegg – Nyhamna, Gossa. Overvåking av vegetasjon og jord – endringer fra 2008 til 2016
Aarrestad, Per Arild; Bakkestuen, Vegard; Stabbetorp, Odd Egil; Töpper, Joachim Paul (NINA Rapport;1348, Research report, 2017)Aarrestad, P.A., Bakkestuen, V., Stabbetorp, O.E. & Töpper. J.P. 2017. Miljøovervåkingsprogram for Ormen Lange landanlegg – Nyhamna, Gossa. Overvåking av vegetasjon og jord – endringer fra 2008 til 2016. - NINA Rapport ... -
Multiannual effects of induced plant defenses: Are defended plants good or bad neighbors?
Benevenuto, Rafael Fonseca; Hegland, Stein Joar; Töpper, Joachim Paul; Rydgren, Knut; Moe, Stein Ragnar; Rodriguez-Saona, Cesar; Seldal, Tarald (Journal article; Peer reviewed, 2018)Defenses induced by herbivore feeding or phytohormones such as methyl jasmonate (MeJA) can affect growth, reproduction, and herbivory, not only on the affected individual but also in its neighboring plants. Here, we report ... -
Pathways of introduction of alien species in Norway: analyses of an exhaustive dataset to prioritise management efforts
Sandvik, Hanno; Olsen, Siri Lie; Töpper, Joachim Paul; Hilmo, Olga (Peer reviewed; Journal article, 2022)1. Alien species constitute one of the major threats to global biodiversity. Stopping alien species at an early stage, preferably before establishment, is crucial for the effectiveness of management actions. To enable early ... -
Plastic Population Effects and Conservative Leaf Traits in a Reciprocal Transplant Experiment Simulating Climate Warming in the Himalayas
Cui, Haijun; Töpper, Joachim Paul; Yang, Yan; Vandvik, Vigdis; Wang, Genxu (Journal article; Peer reviewed, 2018)Climate warming poses considerable challenges for alpine plant species, especially for competitively inferior ones with resource-conservative adaptations to cold climates. The Himalayas are warming at rates considerably ... -
Setting reference levels and limits for good ecological condition in terrestrial ecosystems – Insights from a case study based on the IBECA approach
Jakobsson, Simon; Töpper, Joachim Paul; Evju, Marianne; Framstad, Erik; Lyngstad, Anders; Pedersen, Bård; Sickel, Hanne; Sverdrup-Thygeson, Anne; Vandvik, Vigdis; Velle, Liv Guri; Aarrestad, Per Arild (Journal article, 2020)Effective evidence-based nature conservation and habitat management relies on developing and refining our methodological toolbox for detecting critical ecological changes at an early stage. This requires not only optimizing ... -
Spredningsveier for fremmede arter i Norge. Kunnskapsstatus per 2019.
Hendrichsen, Ditte Katrine; Sandvik, Hanno; Töpper, Joachim Paul; Olsen, Siri Lie; Hilmo, Olga; Magnussen, Kristin; Navrud, Ståle; Fleisje, Erlend Magnussen (NINA Rapport;1735, Research report, 2020)Hendrichsen, D.K., Sandvik, H., Töpper, J.P., Olsen, S.L., Hilmo, O., Magnussen, K., Navrud, S., Fleisje, E.M. 2020. Spredningsveier for fremmede arter i Norge. Kunnskapsstatus per 2019. NINA Rapport 1735. Norsk institutt ... -
A test of local adaptation to drought in germination and seedling traits in populations of two alpine forbs across a 2000 mm/year precipitation gradient
Gya, Ragnhild; Geange, Sonya Rita; Lynn, Joshua; Töpper, Joachim Paul; Wallevik, Øystein; Zernichow, Camilla; Vandvik, Vigdis (Peer reviewed; Journal article, 2023)Seed regeneration is a critical stage in the life histories of plants, affecting species' abilities to maintain local populations, evolve, and disperse to new sites. In this study, we test for local adaptations to drought ... -
The devil is in the detail: non-additive and context-dependent plant population responses to increasing temperature and precipitation. Plant demography in a warmer & wetter climate
Töpper, Joachim Paul; Meineri, E.; Olsen, Siri Lie; Rydgren, Knut; Skarpaas, Olav; Vandvik, Vigdis (Journal article; Peer reviewed, 2018)In climate‐change ecology, simplistic research approaches may yield unrealistically simplistic answers to often more complicated problems. In particular, the complexity of vegetation responses to global climate change begs ... -
The Response of Heterotrophic Prokaryote and Viral Communities to Labile Organic Carbon Inputs Is Controlled by the Predator Food Chain Structure
Sandaa, Ruth-Anne; Pree, Bernadette; Larsen, Aud; Våge, Selina; Tøpper, Birte; Töpper, Joachim Paul; Thyrhaug, Runar; Thingstad, T. Frede (Journal article; Peer reviewed, 2017)Factors controlling the community composition ofmarine heterotrophic prokaryotes include organic-C, mineral nutrients, predation, and viral lysis. Two mesocosm experiments, performed at an Arctic location and bottom-upmanipulated ... -
Viruses on the menu: The appendicularian Oikopleura dioica efficiently removes viruses from seawater
Lawrence, Janice; Töpper, Joachim Paul; Petelenz-Kurdziel, Elzbieta Anna; Bratbak, Gunnar; Larsen, Aud; Thompson, Eric; Troedsson, Christofer; Ray, Jessica Louise (Journal article; Peer reviewed, 2017)Appendicularians are planktonic marine tunicates with elaborate filter-feeding houses that can efficiently trap particles as small as 0.2 lm. While marine viruses are seldom considered outside their role in disease ... -
Wooded hay meadows as viable production systems in sustainable small-scale farming
Rydgren, Knut; Austad, Ingvild; Hamre, Liv Norunn; Töpper, Joachim Paul (Peer reviewed; Journal article, 2020)Wooded hay meadows provide livestock fodder in the form of both foliage from pollarded trees and hay from the understorey, and can be part of an environmentally friendly agroforestry system. However, trees may also have a ...