Results 21 to 30 of about 1,870,807 (288)

Distance Sampling Methodology

open access: yesJournal of the Royal Statistical Society Series B: Statistical Methodology, 2001
Summary We consider the method of distance sampling described by Buckland, Anderson, Burnham and Laake in 1993. We explore the properties of the methodology in simple cases chosen to allow direct and accessible comparisons of distance sampling in the design- and model-based frameworks.
Barry, Simon C, Welsh, Alan
openaire   +3 more sources

Advanced Distance Sampling: Estimating Abundance of Biological Populations [PDF]

open access: yes, 2006
This book is edited by recognized leading experts in the field. Distance sampling methodology has been rapidly evolving since 1993 when the first four editors (STB, DRA, KPB, and JLL) published the book Distance Sampling.
Alpizar-Jara
core   +1 more source

Adaptive k-tree sample plot for the estimation of stem density: An empirical approach

open access: yesJournal of Forest Science, 2018
Available budgets for the inventory of non-commercial woodlands are small. Therefore, there has been increased interest in using distance methods, such as k-tree sampling, which are faster than fixed plot sampling.
Hormoz SOHRABI
doaj   +1 more source

Line transect estimates of Irrawaddy dolphin abundance along the eastern Gulf Coast of Thailand.

open access: yesFrontiers in Marine Science, 2015
Effective conservation of coastal marine mammals is largely dependent on reliable knowledge of their abundance, as well as the ecological and human factors driving their distribution.
Ellen eHines   +6 more
doaj   +1 more source

Stakeholders engagement as an important step for the long‐term monitoring of wild ungulate populations

open access: yesEcological Solutions and Evidence, 2021
Monitoring trends in animal populations is essential for the development of appropriate wildlife management strategies. However, long‐term studies are difficult to maintain mainly due to the lack of continuous funding. In this scenario, the collaboration
João Carvalho   +4 more
doaj   +1 more source

A comparison of four different methods to estimate population size of Alpine marmot (Marmota marmota) [PDF]

open access: yes, 2017
Obtaining reliable information on animal abundance in mountainous landscapes is challenging. Highly heterogeneous habitats tend to reduce detection probabilities, and the three-dimensional, rugged nature of the terrain poses severe limits to the ...
Bertolini, Matteo   +4 more
core   +1 more source

Roadside Car Surveys: Methodological Constraints and Solutions for Estimating Parrot Abundances across the World

open access: yesDiversity, 2021
Parrots stand out among birds because of their poor conservation status and the lack of available information on their population sizes and trends. Estimating parrot abundance is complicated by the high mobility, gregariousness, patchy distributions, and
José L. Tella   +14 more
doaj   +1 more source

Population Abundance and Density Estimates for Costa Rica’s Endemic Sea Snake, Hydrophis platurus xanthos

open access: yesFrontiers in Marine Science, 2022
Population abundance and density estimates provide key information for conservation assessment and prioritization of efforts and management. However, data are still largely unavailable for many taxa, including sea snakes, which appear to be facing global
Brooke L. Bessesen   +4 more
doaj   +1 more source

Evaluation of the distance sampling technique to monitor gregarious species: A simulation exercise

open access: yesWildlife Society Bulletin, 2023
Wildlife count data are used to provide estimates of population abundance. To quantify changes in the size of populations, it is necessary to determine the precision of abundance estimates.
Arthur Jacquemin   +4 more
doaj   +1 more source

An open spatial capture–recapture model for estimating density, movement, and population dynamics from line‐transect surveys

open access: yesEcology and Evolution, 2021
The purpose of many wildlife population studies is to estimate density, movement, or demographic parameters. Linking these parameters to covariates, such as habitat features, provides additional ecological insight and can be used to make predictions for ...
Timothy A. Gowan   +2 more
doaj   +1 more source

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