Positive and Negative Plant-Plant Interactions in Two Contrasting Arctic-Alpine Plant Communities
نویسندگان
چکیده
منابع مشابه
Facilitative plant interactions and climate simultaneously drive alpine plant diversity.
Interactions among species determine local-scale diversity, but local interactions are thought to have minor effects at larger scales. However, quantitative comparisons of the importance of biotic interactions relative to other drivers are rarely made at larger scales. Using a data set spanning 78 sites and five continents, we assessed the relative importance of biotic interactions and climate ...
متن کاملFacilitation and Competition on Gradients in Alpine Plant Communities
We conducted a neighbor removal experiment in natural alpine plant communities of the southwestern Alps to test for the relative importance of competitive and facilitative interactions along elevational and topographical gradients. The experimental sites were chosen to encompass most of the floristic diversity observed along gradients of elevation and topography, which are the two main ecologic...
متن کاملPlant stress signalling: understanding and exploiting plant-plant interactions.
When plants are attacked by insects, volatile chemical signals can be released, not only from the damaged parts, but also systemically from other parts of the plant and this continues after cessation of feeding by the insect. These signals are perceived by olfactory sensory mechanisms in both the herbivorous insects and their parasites. Molecular structures involved can be characterized by mean...
متن کاملDifferent responses of alpine plants to nitrogen addition: effects on plant-plant interactions
The different responses of plant species to resource stress are keys to understand the dynamics of plant community in a changing environment. To test the hypothesis that nitrogen (N) increase would benefit N competitive species, rather than N stress-tolerant species, to compete with neighbours, we conducted an experiment with neighbour removal, N addition and soil moisture as treatments in an a...
متن کاملPlant polyploidy and insect/plant interactions.
We used flow cytometry and extensive geographic surveys of herbivore attack to test whether repeated evolution of autotetraploidy in the perennial herb Heuchera grossulariifolia Rydb. (Saxifragaceae) has created evolutionary barriers to attack by the specialist moth herbivore Greya politella (Prodoxidae). We found that the moth has colonized tetraploid as well as diploid populations, has coloni...
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: Arctic, Antarctic, and Alpine Research
سال: 2004
ISSN: 1523-0430,1938-4246
DOI: 10.1657/1523-0430(2004)036[0464:panpii]2.0.co;2