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| 1 | Recent treeline dynamics are similar between dry and mesic areas of Nepal, central Himalaya显示文摘Aims We investigated the treeline dynamics of two environmentally con-trasting areas in the Nepalese Himalaya to address the following questions:(i)Does the timing of establishment of the current tree-line differ between the two study areas,and can area-specific tree-line developments be identified?(ii)Do recruitment patterns and height growth indicate recent climate-driven treeline advance,fol-lowing the general prediction for the central Himalayan region,in the two study areas?Methods a dry-climate treeline dominated by Pinus wallichiana and a mesic-climate treeline with Abies spectabilis were selected for study.In each area,we sampled the size and age structure of the study spe-cies along three elevational transects(20-m wide)from the forest line to the tree species line crossing the treeline.We also sampled treeline trees from within and outside transects to reconstruct past treeline establishment dynamics.Important Findings Despite differences in moisture regimes,tree species and recent climate trends,our two study areas showed very similar treeline dynamics over the past six decades.In both areas,the recruitment of treeline trees indicates stationary treelines over the past six decades with the current treelines being dominated by trees that were established around 1990.the mesic area has experienced an overall climatic warming trend,and the stationary Abies treeline is hypothesized to be regulated by non-climatic factors,notably grazing.the dry area has not experienced warming but increased climatic variability and some very cool summers in the recent dec-ades may explain the stationary to weakly receding Pinus treeline,which appears more climatically controlled with decreased recruit-ment over the past decades and decreased growth towards higher elevations.In both areas,there is a potential for treeline advance,depending on future land use and climate change.our results highlight the importance of conducting treeline ecotone analyses for several sites or areas,and considering both climatic and non-climatic drivers of the treeline dynamics within each of these areas,for understanding regional treeline dynamics. | Krishna B.Shrestha Annika Hofgaard Vigdis Vandvik | 2015 | Journal of Plant Ecology2015，8，4： | 3 |
| 2 | Scenarios for animal responses to global change in Europe's cold regions: an introduction 显示文摘 | Danell K Hofgaard A Callaghan T | 1999 | Ecological Bulletins1999，，： | 1 |
| 3 | Protection by 6-aminonicotinamide against oxidative stress in cardiac cells显示文摘 | Hofgaard JP Sigurdardottir KS Treiman M | 2006 | Pharmacol Res2006，54，4： | 1 |
| 4 | Comparing warming and grazing effects on birch growth in an alpine environment: a10-year experiment 显示文摘 | Hofgaard A LCkken J O Dalen L | 2010 | Plant Ecology & Diversity2010，3，1： | 1 |
| 5 | Therapeutic effect of idiotype-specific CD4+ T cells against B-cell lymphoma in the absence of anti-idiotypic antibodies显示文摘 | Lundin KU Hofgaard PO Omholt H | 2003 | Blood2003，102，2： | 1 |
| 6 | Therapeutic effect of idiotype-specific CD4+T cells against B-cell lymphoma in the absence of anti-idiotype antibodies显示文摘 | Hofgaard PO Omholt H | 2003 | Blood2003，102，： | 1 |
| 7 | Norepineph-rine inhibits intercellular coupling in rat cardiomyocytes byubiquitination of connexin43 gap junctions显示文摘 | Mollerup S Hofgaard J P Braunstein T H | 2011 | Cell CommunAdhes2011，18，4： | 1 |
| 8 | Subspecific variation in sperm morphology and performance in the Long-tailed Finch (Poephila acuticauda)显示文摘Background: Evolutionary biology endeavours to explain biological diversity,and as such it is critical to develop an understanding of the adaptive and functional significance of trait variation.Spermatozoa exhibit remarkable levels of morphological diversification.However,our understanding of the evolutionary causes and functional significance of this variation is limited,especially at the intraspecific level.Methods: We quantified variation in sperm morphology and performance between two subspecies of Long-tailed Finch(Poephila acuticauda acuticauda and P.a.hecki),a small grassfinch found in tropical northern Australia.Despite a zone of secondary contact,these subspecies are maintained as two distinct forms: P.a.acuticauda occurs in the western part of the species' range and has a yellow bill,while P.a.hecki exhibits a red bill and is found in the eastern part of the range.Results: We found small,but significant differences in sperm size between these subspecies(P.a.acuticauda had longer and narrower sperm than P.a.hecki),which was surprising given the recent evolutionary origins of these two taxa(i.e.0.3 million years ago).Additionally,both subspecies exhibited high values of between- and within-male variation in sperm morphology,though in the case of sperm midpiece length this variation was significantly lower in P.a.acuticauda relative to P.a.hecki.Conclusions: We suggest these observed differences in sperm morphology are the result of genetic drift and reflect historical processes associated with divergence between the eastern and western populations of these two subspecies.Finally,we discuss the potential implications of our findings for the process of population divergence and reproductive isolation. | Melissah Rowe Simon C.Griffith Antje Hofgaard Jan T.Lifjeld | 2015 | Chinese Birds2015，，4： | 1 |
| 9 | Cyclic AMP induces apoptosis in multiple myeloma cells and inhibits tumor development in a mouse myeloma model显示文摘 | Follin-Arbelet V Hofgaard PO Hauglin H | 2011 | BMC Cancer2011，11，： | 1 |
| 10 | Protection by 6-aminonicotinamide against oxidative stress in cardiac cells显示文摘 | Hofgaard JP Sigurdardottir KS Treiman M | 2006 | Pharmacol Res2006，54，4： | 1 |
| 11 | Liver metastasis of cancer facilitated by chemokine receptor CCR6 显示文摘 | Dellacasagrande J Schreurs OJ Hofgaard PO | 2003 | Scand J Immunol2003，57，6： | 1 |
| 12 | Foraging and movement paths of female reindeer: insights from fractal analysis, correlated random walks, and Levy flights 显示文摘 | MARELL A BALL J P HOFGAARD A | 2002 | Canadian Journal of Zoology2002，80，5： | 1 |
| 13 | Structure and regeneration paterns in a virgin Picea abies forest in northern Sweden显示文摘 | HOFGAARD A | 1993 | J Veg Sci1993，4，5： | 1 |
| 14 | Therapeutic effect of idiotype-specific CD4+ T cells against B-cell lymphoma in the absence of anti-idiotypic antibodies显示文摘 | Lundin KU Hofgaard PO Omholt H | | 0，，： | 1 |
| 15 | Changes in student approaches to learning with the introduction of computer-supported problem-based learning显示文摘 | Stromso HI Grottum P Hofgaard Lyeke K | 2004 | Med Edue2004，38，4： | 1 |
| 16 | Evalua- tion of rapid test kits for quantification of HT -2 and T- 2 toxins in naturally contaminated oats 显示文摘 | Aamot H U Hofgaard I S Brodal G | 2013 | World Mycotoxin Journal2013，6，1： | 1 |
| 17 | Evalua- tion of rapid test kits for quantification of deoxyni- valenol in naturally contaminated oats and wheat 显示文摘 | Aamot H U Hofgaard I S Brodal G | 2012 | World Mycotoxin Journal2012，5，4： | 1 |
| 18 | Liver metastasis of cancer facilitated by chemokine receptor CCR6显示文摘 | DELLACASAGRANDE J SCHREURS O J HOFGAARD P O | 2003 | Scand J Immunol2003，57，： | 1 |
| 19 | Liver metastasis of cancer facilitated by chemokine receptor CCR6显示文摘 | Dellacasagrande J Schreurs OJ Hofgaard PO Omholt H Steinsvoll S Schenck K Bogen B Dembic Z | 2003 | Scand J Immunol2003，57，6： | 1 |
| 20 | Dendroclimatie response of Picea mariana and Pinus banksiana along a latitudinal gradient in the eastern canadian boreal forest Canadian Journal of Forest Research显示文摘 | Annika Hofgaard Jacques Tardif Yves Bergeron | 1999 | ProQuest Agriculture Journals1999，29，9： | 1 |
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