scholarly journals A direct test of nitrogen and phosphorus limitation to net primary productivity in a lowland tropical wet forest

Ecology ◽  
2013 ◽  
Vol 94 (7) ◽  
pp. 1540-1551 ◽  
Author(s):  
S. Alvarez-Clare ◽  
M. C. Mack ◽  
M. Brooks
Keyword(s):  
Primary Productivity ◽  
Net Primary Productivity ◽  
Phosphorus Limitation ◽  
Direct Test ◽  
Nitrogen And Phosphorus ◽  
Tropical Wet Forest

scholarly journals Effects of nutrient availability and other elevational changes on bromeliad populations and their invertebrate communities in a humid tropical forest in Puerto Rico

2000 ◽  
Vol 16 (2) ◽  
pp. 167-188 ◽  
Author(s):  
Barbara A. Richardson ◽  
M. J. Richardson ◽  
F. N. Scatena ◽  
W. H. Mcdowell
Keyword(s):  
Species Richness ◽  
Primary Productivity ◽  
Net Primary Productivity ◽  
Plant Density ◽  
Nutrient Concentrations ◽  
Forest Types ◽  
Nutrient Inputs ◽  
Nitrogen And Phosphorus ◽  
Faunal Abundance ◽  
High Plant Density

Nutrient inputs into tank bromeliads were studied in relation to growth and productivity, and the abundance, diversity and biomass of their animal inhabitants, in three forest types along an elevational gradient. Concentrations of phosphorus, potassium and calcium in canopy-derived debris, and nitrogen and phosphorus in phytotelm water, declined with increasing elevation. Dwarf forest bromeliads contained the smallest amounts of debris/plant and lowest concentrations of nutrients in plant tissue. Their leaf turnover rate and productivity were highest and, because of high plant density, they comprised 12.8% of forest net primary productivity (0.47 t ha−1 y−1), and contained 3.3 t ha−1 of water. Annual nutrient budgets indicated that these microcosms were nutrient-abundant and accumulated < 5% of most nutrients passing through them. Exceptions were K and P in the dwarf forest, where accumulation was c. 25% of inputs. Animal and bromeliad biomass/plant peaked in the intermediate elevation forest, and were positively correlated with the debris content/bromeliad across all forest types. Animal species richness showed a significant mid-elevational peak, whereas abundance was independent of species richness and debris quantities, and declined with elevation as forest net primary productivity declined. The unimodal pattern of species richness was not correlated with nutrient concentrations, and relationships among faunal abundance, species richness, nutrient inputs and environment are too complex to warrant simple generalizations about nutrient resources and diversity, even in apparently simple microhabitats.

Regional shifts in phytoplankton succession and primary productivity in the San Antonio Bay System (USA) in response to diminished freshwater inflows

2017 ◽  
Vol 68 (1) ◽  
pp. 131 ◽  
Author(s):  
Daniel L. Roelke ◽  
Hsiu-Ping Li ◽  
Carrie J. Miller-DeBoer ◽  
George M. Gable ◽  
Stephen E. Davis
Keyword(s):  
Primary Productivity ◽  
San Antonio ◽  
Sampling Period ◽  
Phosphorus Limitation ◽  
Trophic Levels ◽  
Human Consumption ◽  
Dry Period ◽  
Nitrogen And Phosphorus ◽  
Commercially Important ◽  
Freshwater Inflows

In many areas of the world, human consumption and climate change threaten freshwater inflows to coastal ecosystems. In the San Antonio Bay System, USA (SABS), freshwater inflows are projected to decrease in the coming decades. Our 30-month sampling period of SABS captured a prolonged period of higher inflows and a prolonged period of lower inflow. Our observations offer insights as to how this system might respond to lower freshwater inflows in the future. Of most importance in our observations was a regional shift that occurred in maximum primary productivity from the middle and lower SABS towards the upper SABS. In addition, a warm-month succession of phytoplankton taxa in the upper SABS that occurred during the wet period did not occur during the dry period. We also observed spatiotemporal shifts in apparent nitrogen- and phosphorus-limitation, with both appearing to influence phytoplankton biomass and primary productivity. Changes to SABS phytoplankton such as these might deleteriously affect organisms of higher trophic levels with life stages that are regionally confined by other factors, such as depth, macrophyte presence, and existence of hard-bottomed substrate, which in this bay system includes both commercially important and endangered species.

Satellite-based estimation of net primary productivity for southern China’s grasslands from 1982 to 2012

2017 ◽  
Vol 71 (3) ◽  
pp. 187-201 ◽  
Author(s):  
W Yang ◽  
T Lu ◽  
S Liu ◽  
J Jian ◽  
F Shi ◽  
...  
Keyword(s):  
Primary Productivity ◽  
Net Primary Productivity
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