Results 111 to 120 of about 15,111 (152)
Seabirds At-Sea Surveys: The Line-Transect Method Outperforms the Point-Transect Alternative [PDF]
Open Ornithology Journal, 2017 Introduction:Knowledge of seasonal distribution and abundance of species is paramount in identifying key areas. Field data collection and analysis must provide best information concerning seabirds at-sea to optimize conservation efforts.Methods:We tested whether modeling of detection probabilities, and density estimates with their coefficients of ...
François Bolduc, David A. Fifield
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Performance of transect and point count underwater visual census methods [PDF]
Ecological Modelling, 1997 A simulation approach was used to study bias and variability of density estimates of fish using the transect and point count underwater visual census methods. Three experiments were conducted to examine the effects of fish density, sampling effort, and the speed of fish in relation to the observer. Fish density and sampling effort did not significantly
R.A Watson, T.J Quinn II
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Point Transect Sampling Along Linear Features
Biometrics, 2010SummaryDistance sampling is a widely used methodology for assessing animal abundance. A key requirement of distance sampling is that samplers (lines or points) are placed according to a randomized design, which ensures that samplers are positioned independently of animals.
Marques, T. A. +4 more
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Kernel Methods in Line and Point Transect Sampling
Biometrics, 1998Summary: We consider kernel estimation of population density based on size and distance data in line and point transect sampling. Asymptotic normality of the estimators is established in each setting, with very weak assumptions imposed on the random sample size.
Mack, Y. P., Quang, Pham X.
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American Journal of Primatology, 2020
AbstractEffective conservation demands more accurate and reliable methods of survey and monitoring of populations. Surveys of gibbon populations have relied mostly on mapping of groups in “listening areas” using acoustical point‐count data. Traditional methods of estimating density in have usually used counts of gibbon groups within fixed‐radius areas ...
Warrren Brockelman
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AbstractEffective conservation demands more accurate and reliable methods of survey and monitoring of populations. Surveys of gibbon populations have relied mostly on mapping of groups in “listening areas” using acoustical point‐count data. Traditional methods of estimating density in have usually used counts of gibbon groups within fixed‐radius areas ...
Warrren Brockelman
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Influences of transect relocation errors on line-point estimates of plant cover
Plant Ecology, 2009The line-point transect method has been used to estimate plant cover for about nine decades. In particular, the method is often used to determine baseline plant cover and monitor for changes in plant cover over time. In such cases, detection of change requires both the initial transect starting position and angle of orientation are exact in relocation ...
Charles D Bonham, Reich Robin M
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2001
Abstract Songbird surveys often utilize point transects rather than line transects for several reasons. Once the observer is at the point, he or she can concentrate solely on detecting, locating and identifying birds, without the need to traverse what may be difficult terrain; he or she can take the easiest route into and away from the ...
S T Buckland +5 more
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Abstract Songbird surveys often utilize point transects rather than line transects for several reasons. Once the observer is at the point, he or she can concentrate solely on detecting, locating and identifying birds, without the need to traverse what may be difficult terrain; he or she can take the easiest route into and away from the ...
S T Buckland +5 more
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A Comparison of Transects and Point Counts in Oak-Pine Woodlands of California
The Condor, 1985Comparaison des resultats de la methode des quadrats et de la methode de denombrement ponctuel pour la determination de la richesse specifique et de la densite de population des oiseaux dans ces terres ...
Verner, Jared, Ritter, Lyman V.
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Journal of Experimental Marine Biology and Ecology, 2006
Abstract This study evaluated the use of video transects obtained from SCUBA divers or remote operated vehicle (ROV) and point intercept transect (PIT) method from divers for monitoring subtropical coral communities. Comparisons were made between the datasets obtained by the ROV and SCUBA diver video transect (‘Diver’) and the PIT method on three ...
Siu Gin Cheung
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Abstract This study evaluated the use of video transects obtained from SCUBA divers or remote operated vehicle (ROV) and point intercept transect (PIT) method from divers for monitoring subtropical coral communities. Comparisons were made between the datasets obtained by the ROV and SCUBA diver video transect (‘Diver’) and the PIT method on three ...
Siu Gin Cheung
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POINT TRANSECT ESTIMATES OF RESIDUE COVER OR CROP CANOPY IN ROWS
Transactions of the ASAE, 1998Linear, evenly spaced point transects are typically used to measure percent of the soil surface covered by crop residue or canopy. As few as five 100-point count transects provide relatively precise measures of uniformly distributed cover, but such transects can provide very poor precision if used to measure cover lying in parallel rows.
null R. W. Rickman +3 more
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