Tabernaemontana rotensis (Kaneh.) P.T. Li is an attractive small tree that endemic to the islands of Guam and Rota. Conservation efforts threatened population are constrained by lack research. Understanding ecology flower fruit development fundamental successful conservation angiosperms. This study determined extent induction following tropical cyclone defoliation, tested efficacy 10% urea spra...

Three plant species from each of three grassland ecosystems were grown under elevated (700 mL/m3) and ambient (350 mL/m3) CO2 and were defoliated or left undefoliated to test whether species response to elevated CO2 and grazing is related to evolutionary grazing history or to mode of photosynthesis. The three ecosystems represented a tropical grassland dominated by C4 species (the Serengeti of ...

In addition to extreme abiotic conditions, biotic factors such as grazing influence the growth of tundra plants. Strategies of carbon assimilation, accumulation, and utilization must not only satisfy the requirements of a rigorous physical environment but also must simultaneously adjust to the impacts associated with herbivory. Representatives of four growth forms found in northern Alaska (a de...

Patrice A. Morrow* and Joel P. Olfelt Department of Ecology, Evolution and Behaviour, 1987 Upper Buford Circle, University of Minnesota, St. Paul, MN 55108, USA Department of Biology, Northeastern Illinois University, 5500 North St. Louis Avenue, Chicago, Illinois 60625-4699, USA *Correspondence: E-mail: [email protected] Abstract Many long-lived plants are known to prolong dormancy in resp...

Dave Guthrie, Tom Cothren, Charles Snipes Complex physiological alterations are associated Producers recocmize tlult success in defoliation dewith leaf aging. One of the first changes can be obo·r :/' served in the behavior of the membranes that enpends on a little science and a lot of luck. Fortunately, tlult view is slowly clulnging as some of the art of defoliaclose and divide the compartmen...

Plants that store nonstructural carbohydrates (NSC) may rely on carbon reserves to survive carbon-limiting stress, assuming that reserves can be mobilized. We asked whether carbon reserves decrease in resource stressed seedlings, and if NSC allocation is related to species' relative stress tolerances. We tested the effects of stress (shade, drought, and defoliation) on NSC in seedlings of five ...

Hexazinone [3-cyclohexyl-6-(dimethylamino)-l-methyl-l,Z,5-tria~in~2,4,(lH,ZH)-dione] was tested in the 2, 1, and 0.5 cc size uellet (10% ai) against very small stems [average height, 1.97m; average ground line diameter (GLD), 2 cm] of water oak, Quercus nigra L., at 1.12 and 2.24 kg/ha on a sandy loam soil. First year defoliation of water oak by the 0.5 cc pellet at 2.24 kg/ha was significantly...

1. Herbivore damage can select for tolerance in plant populations where genetic variation for tolerance exists. The causes underlying variation in tolerance are not fully resolved. We assessed the importance of two potential mechanisms for tolerance by examining its relationship with leaf photosynthetic rate and relative biomass allocation across plant organs. 2. We monitored responses of 12 as...

Forest disturbances caused by pest insects are threatening ecosystem stability, sustainable forest management and economic return in boreal forests. Climate change and increased extreme weather patterns can magnify the intensity of forest disturbances, particularly at higher latitudes. Due to rapid responses to elevating temperatures, forest insect pests can flexibly change their survival, disp...