scholarly journals Population abundance estimation with heterogeneous encounter probabilities using numerical integration

2017 ◽  
Vol 81 (2) ◽  
pp. 322-336 ◽  
Author(s):  
Gary C. White ◽  
Evan G. Cooch
Keyword(s):  
Numerical Integration ◽  
Abundance Estimation ◽  
Population Abundance

scholarly journals Estimating fish population abundance by integrating quantitative data on environmental DNA and hydrodynamic modelling

2018 ◽  
Author(s):  
Keiichi Fukaya ◽  
Hiroaki Murakami ◽  
Seokjin Yoon ◽  
Kenji Minami ◽  
Yutaka Osada ◽  
...  
Keyword(s):  
Environmental Dna ◽  
Cost Effective ◽  
Population Monitoring ◽  
Fish Population ◽  
Abundance Estimation ◽  
Population Abundance ◽  
Jack Mackerel ◽  
Non Invasive ◽  
Quantitative Measurements ◽  
Japanese Jack Mackerel

AbstractWe propose a general framework of abundance estimation based on spatially replicated quantitative measurements of environmental DNA in which production, transport, and degradation of DNA are explicitly accounted for. Application to a Japanese jack mackerel (Trachurus japonicus) population in Maizuru Bay revealed that the method gives an estimate of population abundance comparable to that of a quantitative echo sounder method. These findings indicate the ability of environmental DNA to reliably reflect population abundance of aquatic macroorganisms and may offer a new avenue for population monitoring based on the fast, cost-effective, and non-invasive sampling of genetic information.

scholarly journals Spatially explicit approach to population abundance estimation in field surveys

2017 ◽  
Author(s):  
Nao Takashina ◽  
Buntarou Kusumoto ◽  
Maria Beger ◽  
Suren Rathnayake ◽  
Hugh P. Possingham
Keyword(s):  
Point Processes ◽  
Survey Design ◽  
Ecological Factors ◽  
Population Estimation ◽  
Estimation Accuracy ◽  
Abundance Estimation ◽  
Spatially Explicit ◽  
Population Abundance ◽  
Field Surveys ◽  
Explicit Approach

AbstractThe abundance of species is a fundamental consideration in ecology and conservation biology. Although broad models have been proposed to estimate the population abundance using existing data, available data is often limited. With no information available, a population estimation will rely on time consuming field surveys. Typically, time is a critical constraint in conservation and often management decisions must be made quickly under the data limited situation. Depending on time and budgetary constraints, the required accuracy of field survey changes significantly. Hence, it is desirable to set up an effective survey design to minimize time and effort of sampling given required accuracy. We examine a spatially-explicit approach to population estimation using spatial point processes, enabling us to explicitly and consistently discuss various sampling designs. We find that the accuracy of abundance estimation varies with both ecological factors and survey design. Although the spatial scale of sampling does not affect estimation accuracy when the underlying individual distribution is random, it decreases with the sampled unit size if individuals tend to form clusters. These results are derived analytically and checked numerically. Obtained insights provide a benchmark to predict the quality of population estimation, and improve survey designs for ecological studies and conservation.

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

KELIMPAHAN POPULASI DAN PERBEDAAN MORFOMETRI Telescopium telescopium PADA HABITAT MANGROVE DI SUNGAI BONGKOK KAMPUNG BAGAN TANJUNG PIAYU DAN DI SEKITAR TPA PUNGGUR KOTA BATAM

SIMBIOSA ◽  
2014 ◽  
Vol 3 (1) ◽  
Author(s):  
Yarsi Efendi ◽  
Ramses Ramses ◽  
Adil Waraney
Keyword(s):  
Random Sampling ◽  
Research Result ◽  
Sampling Point ◽  
Population Abundance ◽  
Mangrove Habitat ◽  
Measurement Result ◽  
Garbage Disposal

The Research have done started from February to June 2013, have purpose to compare the population abudance and difference of morphometric Telescopium telescopium in two different observation places. The sampling point determined by method of random sampling. The sample has taken by plot measurement 10x10 m and the sub plot measurement 1x1 m placed in 5 pieces plot measurement 10x10 m.The research result got 62 individual Telescopium telescopium in research location with the density value 0.155 (ind/m²) at 1st location and 297 individual Telescopium telescopium with the density value 0.7425 (ind/m²) at 2nd location. The average measurement result (length and dimeter) morphometric of Telescopium telescopium found at mangrove habitat in Sungai Bongkok was length 8.94 cm and diameter 4.73 cm. The morphometric average measurement result (length and diameter) Telescopium telescopium found at mangrove habitat around the garbage disposal Punggur was length 4.66 cm and diameter 2.54 cm. Keywords: Population Abundance; Morphometric; Telescopium telescopium. 

A Modified Algorithm for Reduction of Error in Combined Numerical Integration

2019 ◽  
Vol 51 (04) ◽  
pp. 745-750
Author(s):  
A.A BHATTI ◽  
M.S CHANDIO ◽  
R.A MEMON ◽  
M.M SHAIKH
Keyword(s):  
Numerical Integration ◽  
Modified Algorithm
Sign in / Sign up

Export Citation Format

Share Document