Facilitation vs. apparent competition: insect herbivory alters tree seedling recruitment under nurse shrubs in a steppe-woodland ecotone
نویسندگان
چکیده
منابع مشابه
Effects of insect herbivory on the performance of Larix sibirica in a forest-steppe ecotone
The potential of insects to cause temporary spatial shifts of the forest-steppe borderline was investigated in a case study in the northern Mongolian mountain taiga, where Larix sibirica forests border on montane meadow steppe. Insect herbivores of L. sibirica in northern Mongolia include gypsy moth (Lymantria dispar) and grasshoppers, which defoliate trees. Grasshoppers have (like mice) an add...
متن کاملCompetition and facilitation structure plant communities under nurse tree canopies in extremely stressful environments
Nurse plant facilitation in stressful environments can produce an environment with relatively low stress under its canopy. These nurse plants may produce the conditions promoting intense competition between coexisting species under the canopy, and canopies may establish stress gradients, where stress increases toward the edge of the canopy. Competition and facilitation on these stress gradients...
متن کاملTree seedling richness, but not neighborhood composition, influences insect herbivory in a temperate deciduous forest community
Insect herbivores can serve as important regulators of plant dynamics, but their impacts in temperate forest understories have received minimal attention at local scales. Here, we test several related hypotheses about the influence of plant neighborhood composition on insect leaf damage in southwestern Pennsylvania, USA. Using data on seedlings and adult trees sampled at 36 sites over an approx...
متن کاملTree recruitment in the Forest-tundra Ecotone
ACKNOWLEDGEMENTS: This thesis is a product under the International Polar Year (IPY) core project PPS Arctic (http://ppsarctic.nina.no) which was financially supported by the Research Council of Norway via the IPY grant 176065/S30 to A. Hofgaard. I would like to thank my supervisors Lars Söderström (NTNU) and Annika Hofgaard (NINA) for their time and effort in helping me build and structure this...
متن کاملDoes the strength of facilitation by nurse shrubs depend on grazing resistance of tree saplings?
Facilitation of tree regeneration by nurse shrubs that offer protection against large herbivores is an important driver of wood-pasture dynamics. Here we asked whether the response to facilitation by nurse shrubs depends on the grazing resistance of the protégé saplings. We experimentally tested the protective effects of the thorny Rosa rubiginosa on browsing frequency, survival, and biomass ch...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Ecology
سال: 2010
ISSN: 0022-0477,1365-2745
DOI: 10.1111/j.1365-2745.2009.01631.x