scholarly journals Long-term consistency in spatial patterns of primate seed dispersal

2017 ◽  
Vol 7 (5) ◽  
pp. 1435-1441 ◽  
Author(s):  
Eckhard W. Heymann ◽  
Laurence Culot ◽  
Christoph Knogge ◽  
Tony Enrique Noriega Piña ◽  
Emérita R. Tirado Herrera ◽  
...  
Keyword(s):  
Seed Dispersal ◽  
Spatial Patterns ◽  
Primate Seed Dispersal

scholarly journals Spatially varying constraints of human-caused fire occurrence in British Columbia, Canada

2017 ◽  
Vol 26 (3) ◽  
pp. 219 ◽  
Author(s):  
Philip E. Camp ◽  
Meg A. Krawchuk
Keyword(s):  
British Columbia ◽  
Spatial Patterns ◽  
Fire Management ◽  
Fire Occurrence ◽  
Explanatory Variables ◽  
Human Footprint ◽  
Key Factor ◽  
Key Drivers ◽  
Spatially Varying

Human-caused wildfires are controlled by human and natural influences, and determining their key drivers is critical for understanding spatial patterns of wildfire and implementing effective fire management. We examined an array of explanatory variables that account for spatial controls of human-caused fire occurrence from 1990 to 2013 among six ecosystem zones that vary in human footprint and environmental characteristics in British Columbia, Canada. We found that long-term patterns of human-caused fire in ecosystem zones with a larger human footprint were strongly controlled by biophysical variables explaining conditions conducive to burning, whereas fire occurrence in remote ecosystem zones was controlled by various metrics of human activity. A metric representing the wildland–urban interface was a key factor explaining human-caused fire occurrence regardless of ecosystem zone. Our results contribute to the growing body of research on the varying constraints of spatial patterns of fire occurrence by explicitly examining human-caused fire and the heterogeneity of constraints based on human development.

Long-term trends and spatial patterns of satellite-retrieved PM2.5 concentrations in South and Southeast Asia from 1999 to 2014

2018 ◽  
Vol 615 ◽  
pp. 177-186 ◽  
Author(s):  
Yusheng Shi ◽  
Tsuneo Matsunaga ◽  
Yasushi Yamaguchi ◽  
Zhengqiang Li ◽  
Xingfa Gu ◽  
...  
Keyword(s):  
Southeast Asia ◽  
Spatial Patterns ◽  
South And Southeast Asia ◽  
Long Term Trends

scholarly journals Long-term seasonal and spatial patterns in mortality and survival of Calanus finmarchicus across the Atlantic Zone Monitoring Programme region, Northwest Atlantic

2009 ◽  
Vol 66 (9) ◽  
pp. 1942-1958 ◽  
Author(s):  
Stéphane Plourde ◽  
Pierre Pepin ◽  
Erica J. H. Head
Keyword(s):  
Population Growth ◽  
Spatial Patterns ◽  
Phytoplankton Biomass ◽  
Mortality Rates ◽  
Monitoring Programme ◽  
Calanus Finmarchicus ◽  
Northwest Atlantic ◽  
Specific Mortality ◽  
Main Factor

Abstract Plourde, S., Pepin, P., and Head, E. J. H. 2009. Long-term seasonal and spatial patterns in mortality and survival of Calanus finmarchicus across the Atlantic Zone Monitoring Programme region, Northwest Atlantic. – ICES Journal of Marine Science, 66: 1942–1958. The vertical life table method was used to estimate stage-specific daily mortality rates and survival from 1999 to 2006 for Calanus finmarchicus sampled in the Canadian Atlantic Zone Monitoring Programme, which covers the Newfoundland–Labrador Shelf (NLS), Gulf of St Lawrence (GSL), and Scotian Shelf (SS). Stage-specific mortality rates and survival showed significant regional and seasonal differences, with the largest signal associated with variations in temperature. Density-dependent mortality, associated with the abundance of C6 females, was the main factor influencing mortality in the egg–C1 transition during the period of population growth in spring on the SS, and in summer in the GSL and on the NLS. In autumn, mortality in egg–C1 was positively related to temperature and negatively related to phytoplankton biomass, with particularly high mortality rates on the SS. The integration of our results into stage-specific recruitment rates from egg to C5 revealed that C. finmarchicus populations experience their greatest loss (mortality) during the egg–C1 transition. Loss during development to C1 was greater in the GSL than in the other regions during the period of population growth, resulting in lower recruitment success in the GSL. In autumn, C. finmarchicus showed low stage-specific daily recruitment rates on the SS at high temperatures, and low phytoplankton biomass compared with those in the GSL and on the NLS. Our findings reinforce the necessity of describing regional and seasonal patterns in mortality and survival to understand factors controlling the population dynamics of C. finmarchicus.

scholarly journals Primate seed dispersal leaves spatial genetic imprint throughout subsequent life stages of the Neotropical tree Parkia panurensis

Trees ◽  
2014 ◽  
Vol 28 (6) ◽  
pp. 1569-1575 ◽  
Author(s):  
Ronald Bialozyt ◽  
Kathrin Luettmann ◽  
Inga M. Michalczyk ◽  
Pedro Pablo Pinedo Saboya ◽  
Birgit Ziegenhagen ◽  
...  
Keyword(s):  
Seed Dispersal ◽  
Life Stages ◽  
Neotropical Tree ◽  
Primate Seed Dispersal

scholarly journals Gradients of column CO<sub>2</sub> across North America from the NOAA Global Greenhouse Gas Reference Network

2017 ◽  
Vol 17 (24) ◽  
pp. 15151-15165 ◽  
Author(s):  
Xin Lan ◽  
Pieter Tans ◽  
Colm Sweeney ◽  
Arlyn Andrews ◽  
Andrew Jacobson ◽  
...  
Keyword(s):  
North America ◽  
Greenhouse Gas ◽  
Spatial Patterns ◽  
Reference Network ◽  
Spatial Gradients ◽  
Continental Scale ◽  
Satellite Retrievals ◽  
The Impact ◽  
Total Column

Abstract. This study analyzes seasonal and spatial patterns of column carbon dioxide (CO2) over North America, calculated from aircraft and tall tower measurements from the NOAA Global Greenhouse Gas Reference Network from 2004 to 2014. Consistent with expectations, gradients between the eight regions studied are larger below 2 km than above 5 km. The 11-year mean CO2 dry mole fraction (XCO2) in the column below  ∼  330 hPa ( ∼  8 km above sea level) from NOAA's CO2 data assimilation model, CarbonTracker (CT2015), demonstrates good agreement with those calculated from calibrated measurements on aircraft and towers. Total column XCO2 was attained by combining modeled CO2 above 330 hPa from CT2015 with the measurements. We find large spatial gradients of total column XCO2 from June to August, with north and northeast regions having  ∼  3 ppm stronger summer drawdown (peak-to-valley amplitude in seasonal cycle) than the south and southwest regions. The long-term averaged spatial gradients of total column XCO2 across North America show a smooth pattern that mainly reflects the large-scale circulation. We have conducted a CarbonTracker experiment to investigate the impact of Eurasian long-range transport. The result suggests that the large summertime Eurasian boreal flux contributes about half of the north–south column XCO2 gradient across North America. Our results confirm that continental-scale total column XCO2 gradients simulated by CarbonTracker are realistic and can be used to evaluate the credibility of some spatial patterns from satellite retrievals, such as the long-term average of growing-season spatial patterns from satellite retrievals reported for Europe which show a larger spatial difference ( ∼  6 ppm) and scattered hot spots.

Primate Seed Dispersal: The Fate of Dispersed Seeds

Biotropica ◽  
1989 ◽  
Vol 21 (2) ◽  
pp. 148 ◽  
Author(s):  
Colin A. Chapman
Keyword(s):  
Seed Dispersal ◽  
Primate Seed Dispersal

Predicting seasonal and spatial patterns of long-term nitrogen oxides concentration in Tehran, Iran using land use regression

2013 ◽  
Vol 2013 (1) ◽  
pp. 5223
Author(s):  
Hassan Amini ◽  
Seyed Mahmood Taghavi Shahri ◽  
Sarah B. Henderson ◽  
Kazem Naddafi ◽  
Ramin Nabizadeh ◽  
...  
Keyword(s):  
Land Use ◽  
Nitrogen Oxides ◽  
Spatial Patterns ◽  
Land Use Regression
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