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Ørjan Totland
Researcher at University of Bergen
Publications - 109
Citations - 9665
Ørjan Totland is an academic researcher from University of Bergen. The author has contributed to research in topics: Pollinator & Pollination. The author has an hindex of 43, co-authored 109 publications receiving 8619 citations. Previous affiliations of Ørjan Totland include Norwegian University of Life Sciences.
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Journal ArticleDOI
Plant community responses to experimental warming across the tundra biome
Marilyn D. Walker,C. Henrik Wahren,Robert D. Hollister,Greg H. R. Henry,Lorraine E. Ahlquist,Juha M. Alatalo,M. Syndonia Bret-Harte,Monika P. Calef,Terry V. Callaghan,Amy B Carroll,Howard E. Epstein,Ingibjörg S. Jónsdóttir,Julia A. Klein,Borgthor Magnusson,Ulf Molau,Steven F. Oberbauer,Steven P. Rewa,Clare H. Robinson,Gaius R. Shaver,Katharine N. Suding,Catharine C. Thompson,Anne Tolvanen,Ørjan Totland,P. Lee Turner,Craig E. Tweedie,P. J. Webber,Philip A. Wookey +26 more
TL;DR: Warming increased height and cover of deciduous shrubs and graminoids, decreased cover of mosses and lichens, and decreased species diversity and evenness, which predict that warming will cause a decline in biodiversity across a wide variety of tundra, at least in the short term.
Journal ArticleDOI
How does climate warming affect plant‐pollinator interactions?
Stein Joar Hegland,Anders Nielsen,Anders Nielsen,Amparo Lázaro,Anne-Line Bjerknes,Ørjan Totland +5 more
TL;DR: The onset of flowering in plants and first appearance dates of pollinators in several cases appear to advance linearly in response to recent temperature increases, and potential ways of studying warming-caused mismatches and their consequences for plant-pollinator interactions are suggested.
Journal ArticleDOI
Responses of tundra plants to experimental warming:meta‐analysis of the international tundra experiment
A. M. Arft,Marilyn D. Walker,Jessica Gurevitch,Juha M. Alatalo,M. S. Bret-Harte,Mark R. T. Dale,M. Diemer,Felix Gugerli,Gregory H. R. Henry,Michael H. Jones,Robert D. Hollister,Ingibjörg S. Jónsdóttir,Kari Laine,Esther Lévesque,G. M. Marion,Ulf Molau,P. Mølgaard,Urban Nordenhäll,V. Raszhivin,Clare H. Robinson,Gregory Starr,Anna Stenström,Mikael Stenström,Ørjan Totland,P. L. Turner,L. J. Walker,P. J. Webber,Jeffrey M. Welker,Philip A. Wookey +28 more
TL;DR: Results indicate that key phenological events such as leaf bud burst and flowering occurred earlier in warmed plots throughout the study period; however, there was little impact on growth cessation at the end of the season.
Journal ArticleDOI
Global assessment of experimental climate warming on tundra vegetation: heterogeneity over space and time.
Sarah C. Elmendorf,Gregory H. R. Henry,Robert D. Hollister,Robert G. Björk,Anne D. Bjorkman,Terry V. Callaghan,Terry V. Callaghan,Laura Siegwart Collier,Elisabeth J. Cooper,Johannes H. C. Cornelissen,Thomas A. Day,Anna Maria Fosaa,William A. Gould,Jarngerdur Gretarsdottir,John Harte,Luise Hermanutz,David S. Hik,Annika Hofgaard,Frith C. Jarrad,Ingibjörg S. Jónsdóttir,Frida Keuper,Kari Klanderud,Julia A. Klein,Saewan Koh,Gaku Kudo,Simone I. Lang,Val Loewen,Jeremy L. May,Joel Mercado,Anders Michelsen,Ulf Molau,Isla H. Myers-Smith,Steven F. Oberbauer,Sara Pieper,Eric Post,Christian Rixen,Clare H. Robinson,Niels Martin Schmidt,Gaius R. Shaver,Anna Stenström,Anne Tolvanen,Ørjan Totland,Tiffany G. Troxler,Carl-Henrik Wahren,Patrick J. Webber,Jeffery M Welker,Philip A. Wookey +46 more
TL;DR: In this article, a synthesis of 61 experimental warming studies, of up to 20 years duration, in tundra sites worldwide, was used to understand the sensitivity of tundras vegetation to climate warming and to forecast future biodiversity and vegetation feedbacks to climate.
Journal ArticleDOI
Global negative vegetation feedback to climate warming responses of leaf litter decomposition rates in cold biomes
Johannes H. C. Cornelissen,Peter M. van Bodegom,Rien Aerts,Terry V. Callaghan,Richard S. P. van Logtestijn,Juha M. Alatalo,F. Stuart Chapin,Renato Gerdol,Jon Tomas Gudmundsson,Dylan Gwynn-Jones,Anne E. Hartley,David S. Hik,Annika Hofgaard,Ingibjörg S. Jónsdóttir,Staffan Karlsson,Julia A. Klein,James A. Laundre,Borgthor Magnusson,Anders Michelsen,Ulf Molau,Vladimir G. Onipchenko,Helen M. Quested,Sylvi M. Sandvik,Inger Kappel Schmidt,Gus Shaver,Bjørn Solheim,Nadejda A. Soudzilovskaia,Anna Stenström,Anne Tolvanen,Ørjan Totland,Naoya Wada,Jeffrey M. Welker,Xinquan Zhao,Motherisk Team +33 more
TL;DR: It is demonstrated that longer-term, large-scale changes to leaf litter decomposition will be driven primarily by both direct warming effects and concomitant shifts in plant growth form composition, with a much smaller role for changes in litter quality within species.