Results 41 to 50 of about 13,110,839 (301)

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

Reliable estimates of wild boar populations by nocturnal distance sampling

open access: yesWildlife Biology, 2020
The wild boar is one of the most invasive species among large mammals in both its native and introduced ranges. This species represents a main threat for crops and biodiversity and a pest for the pig industry due to the rapid expansion of the African ...
S. Focardi   +9 more
semanticscholar   +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

Domestic Cat Abundance and Activity Across a Residential Land Use Gradient

open access: yesFrontiers in Ecology and Evolution, 2021
Free-ranging domestic cats are a detriment to wildlife and humans by preying on native species and transmitting disease. As a result, removing free-ranging cats from the landscape has become a conservation and public health priority.
Kevin F. P. Bennett   +5 more
doaj   +1 more source

Analysis of Farthest Point Sampling for Approximating Geodesics in a Graph [PDF]

open access: yes, 2013
A standard way to approximate the distance between any two vertices $p$ and $q$ on a mesh is to compute, in the associated graph, a shortest path from $p$ to $q$ that goes through one of $k$ sources, which are well-chosen vertices.
Kamousi, Pegah   +3 more
core   +4 more sources

How Many Reindeer? UAV Surveys as an Alternative to Helicopter or Ground Surveys for Estimating Population Abundance in Open Landscapes

open access: yesRemote Sensing, 2022
Conservation of wildlife depends on precise and unbiased knowledge on the abundance and distribution of species. It is challenging to choose appropriate methods to obtain a sufficiently high detectability and spatial coverage matching the species ...
Ingrid Marie Garfelt Paulsen   +8 more
doaj   +1 more source

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