An optimal foraging and migration model for juvenile plaice

1994 ◽  
Vol 8 (2) ◽  
pp. 125-149 ◽  
Author(s):  
M. T. Burrows

2020 ◽  
Vol 12 (1) ◽  
pp. 11-24
Author(s):  
Kristina S. Kalkan ◽  
Sofija Forkapić ◽  
Slobodan B. Marković ◽  
Kristina Bikit ◽  
Milivoj B. Gavrilov ◽  
...  

AbstractSoil erosion is one of the largest global problems of environmental protection and sustainable development, causing serious land degradation and environmental deterioration. The need for fast and accurate soil rate assessment of erosion and deposition favors the application of alternative methods based on the radionuclide measurement technique contrary to long-term conventional methods. In this paper, we used gamma spectrometry measurements of 137Cs and unsupported 210Pbex in order to quantify the erosion on the Titel Loess Plateau near the Tisa (Tisza) River in the Vojvodina province of Serbia. Along the slope of the study area and in the immediate vicinity eight representative soil depth profiles were taken and the radioactivity content in 1 cm thick soil layers was analyzed. Soil erosion rates were estimated according to the profile distribution model and the diffusion and migration model for undisturbed soil. The net soil erosion rates, estimated by 137Cs method range from −2.3 t ha−1 yr−1 to −2.7 t ha−1 yr−1, related to the used conversion model which is comparable to published results of similar studies of soil erosion in the region. Vertical distribution of natural radionuclides in soil profiles was also discussed and compared with the profile distribution of unsupported 210Pbex measurements. The use of diffusion and migration model to convert the results of 210Pbex activities to soil redistribution rates indicates a slightly higher net erosion of −3.7 t ha−1 yr−1 with 98% of the sediment delivery ratio.





1969 ◽  
Vol 20 (2) ◽  
pp. 2-20,140
Author(s):  
Fumio Toishi


1970 ◽  
Vol 2 (01) ◽  
pp. 83-109 ◽  
Author(s):  
A. W. Davis

Some results for a general Markov branching-diffusion process are presented, and applied to a model recently considered by Bailey. Moments of the limiting distributions of certain natural measures of the spatial location and dispersion of the population are shown to be expressible in terms of the LauricellaFD-type hypergeometric functions, when the population multiplies according to the simple birth and death process with λ > μ.



PLoS ONE ◽  
2014 ◽  
Vol 9 (12) ◽  
pp. e115018 ◽  
Author(s):  
Elizabeth Scribner ◽  
Olivier Saut ◽  
Paula Province ◽  
Asim Bag ◽  
Thierry Colin ◽  
...  


Author(s):  
CHRISTOPHER W. REED ◽  
HIMANGSHU DAS ◽  
ALAN W. NIEDORODA


2019 ◽  
Vol 123 (14) ◽  
pp. 9506-9515 ◽  
Author(s):  
Jiangfan Liu ◽  
Tairan Fu ◽  
Congling Shi




1970 ◽  
Vol 2 (1) ◽  
pp. 83-109 ◽  
Author(s):  
A. W. Davis

Some results for a general Markov branching-diffusion process are presented, and applied to a model recently considered by Bailey. Moments of the limiting distributions of certain natural measures of the spatial location and dispersion of the population are shown to be expressible in terms of the Lauricella FD-type hypergeometric functions, when the population multiplies according to the simple birth and death process with λ > μ.



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