In oligotrophic seas such as South China Sea, the subsurface or deep chlorophyll maximum (DCM) is always present. The surface planktonic community receives sufficient light, but short of nutrients. DCM layer under light limitation, frequent supply Therefore, vertical mixing becomes critical in determining their composition and drives changes by responding to this study, we conducted an onboard ...

conclusions bacillus thuringiensis is very sensitive to the interaction of p. fluorescens, however is capable to survive in soil due to its capacity of sporulate. some of the cells in the form of spores germinated and folded slightly and remained in a constant cycle of sporulation and germination. this confirms that b. thuringiensis ips82 can germinate, grow and sporulate in soil. results the a...

Phytoplankton compete for nutrients and light in a vertically heterogeneous environment determined by turbulent mixing. We analyzed a model of competition between two phytoplankton species in a stratified water column. We assume that the surface layer is uniformly mixed and that the deep layer is poorly mixed, as is commonly observed in lakes and oceans. We employed two analytical techniques, I...

We studied the physiological response of phytoplankton to the interacting effects of 3 factors affected by global climate change: CO2, nutrient loading and irradiance. Treatments had a high and low level for each factor: CO2 was bubbled at 1000 ppm by volume versus present atmo spheric values; high nutrient treatments had a combination of inorganic and organic nutrients; and light treatments we...

1. Environmental heterogeneity created by prescribed burning provided the context for testing whether the distribution of an oak specialist (the lace bug, Corythuca arcuata ) could be explained by stoichiometric mismatches between herbivore and host plant composition. 2. Field observations showed that lace bug density was seven-fold higher in frequently burned than in unburned units. 3. Lace bu...

Chance events such as seed dispersal determine the potential composition of plant communities, but the eventual assemblage is determined in large part by subsequent interactions among species. Postcolonization sorting also affects the ultimate composition of communities assembled by people for restoration, horticulture, or conservation. Thus, knowledge of the mechanisms controlling interspecifi...