Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

What are Populations and Communities?00:30

What are Populations and Communities?

36.0K
Overview
36.0K
Stratified Sampling Method01:16

Stratified Sampling Method

14.1K
Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
To choose a stratified sample, divide the population into groups called strata and then take a...
14.1K
Conservation of Small Populations02:04

Conservation of Small Populations

16.1K
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
16.1K
Random Sampling Method01:09

Random Sampling Method

13.7K
Sampling is a technique to select a portion (or subset) of the larger population and study that portion (the sample) to gain information about the population. Data are the result of sampling from a population. The sampling method ensures that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest. Among the various sampling methods used by...
13.7K
Conservation of Declining Populations02:07

Conservation of Declining Populations

12.1K
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
12.1K
Cluster Sampling Method01:20

Cluster Sampling Method

13.7K
Appropriate sampling methods ensure that samples are drawn without bias and accurately represent the population. Because measuring the entire population in a study is not practical, researchers use samples to represent the population of interest.
To choose a cluster sample, divide the population into clusters (groups) and then randomly select some of the clusters. All the members from these clusters are in the cluster sample. For example, if you randomly sample four departments from your...
13.7K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Evaluation of medetomidine-tiletamine-zolazepam as a partially reversible field anesthesia combination for mesocarnivores.

PloS one·2026
Same author

Prey-soaking behavior in Iberian lynx.

Ecology·2026
Same author

Jaguar Density at the Northeastern Limit of Its Distribution in Mexico.

Ecology and evolution·2026
Same author

The combined effects of multiple stressors in an endangered, long-lived species: Lessons learned and ways forward.

Ecological applications : a publication of the Ecological Society of America·2025
Same author

Jackdaws Use Lynx Scat in Nests: Implications for Iberian Lynx Genetic Monitoring.

Ecology and evolution·2025
Same author

Abundance-mediated species interactions.

Ecology·2024

Related Experiment Video

Updated: Nov 17, 2025

Spotting Cheetahs: Identifying Individuals by Their Footprints
09:47

Spotting Cheetahs: Identifying Individuals by Their Footprints

Published on: May 1, 2016

15.1K

Spatial capture-recapture with random thinning for unidentified encounters.

José Jiménez1, Ben C Augustine2, Daniel W Linden3

  • 1Instituto de Investigación en Recursos Cinegéticos (IREC, CSIC-UCLM-JCCM) Ronda de Toledo, 12 Ciudad Real 13071 Spain.

Ecology and Evolution
|February 18, 2021
PubMed
Summary

A new spatial capture-recapture model combines identified and unidentified samples, improving population density estimates. This method enhances precision, especially for low-density populations using noninvasive sampling techniques.

Keywords:
Ursus arctosbrown beardensity estimationnoninvasive samplingspatial capture–recaptureuncertain identityunmarked

More Related Videos

Low-Cost Automated Flight Intercept Trap for the Temporal Sub-Sampling of Flying Insects Attracted to Artificial Light at Night
06:19

Low-Cost Automated Flight Intercept Trap for the Temporal Sub-Sampling of Flying Insects Attracted to Artificial Light at Night

Published on: December 29, 2021

2.9K
Long-term Video Tracking of Cohoused Aquatic Animals: A Case Study of the Daily Locomotor Activity of the Norway Lobster Nephrops norvegicus
05:57

Long-term Video Tracking of Cohoused Aquatic Animals: A Case Study of the Daily Locomotor Activity of the Norway Lobster Nephrops norvegicus

Published on: April 8, 2019

7.1K

Related Experiment Videos

Last Updated: Nov 17, 2025

Spotting Cheetahs: Identifying Individuals by Their Footprints
09:47

Spotting Cheetahs: Identifying Individuals by Their Footprints

Published on: May 1, 2016

15.1K
Low-Cost Automated Flight Intercept Trap for the Temporal Sub-Sampling of Flying Insects Attracted to Artificial Light at Night
06:19

Low-Cost Automated Flight Intercept Trap for the Temporal Sub-Sampling of Flying Insects Attracted to Artificial Light at Night

Published on: December 29, 2021

2.9K
Long-term Video Tracking of Cohoused Aquatic Animals: A Case Study of the Daily Locomotor Activity of the Norway Lobster Nephrops norvegicus
05:57

Long-term Video Tracking of Cohoused Aquatic Animals: A Case Study of the Daily Locomotor Activity of the Norway Lobster Nephrops norvegicus

Published on: April 8, 2019

7.1K

Area of Science:

  • Ecology
  • Wildlife Biology
  • Statistical Modeling

Background:

  • Spatial capture-recapture (SCR) models are vital for estimating wildlife population density using capture-recapture data.
  • Existing SCR models often require complete individual identification or separate analyses for identified and unidentified samples.
  • Noninvasive sampling methods frequently yield a mix of identified and unidentified data, posing analytical challenges.

Purpose of the Study:

  • To develop a novel "random thinning" spatial capture-recapture model.
  • To integrate both identified and unidentified samples within a single observation model.
  • To improve population density estimation in scenarios with limited individual identification.

Main Methods:

  • Developed a "random thinning" SCR model.
  • Utilized a Bayesian framework with NIMBLE for model fitting.
  • Combined data from identified and unidentified samples within a unified model structure.

Main Results:

  • The "random thinning" SCR model significantly improved parameter estimates, particularly for low-density populations.
  • Inclusion of unidentified samples led to up to 79% greater precision in estimates.
  • The model was successfully applied to estimate brown bear density in Northern Spain.

Conclusions:

  • The "random thinning" SCR model offers a robust approach for integrating mixed-identity data in noninvasive wildlife studies.
  • This method enhances the precision of population density estimates, especially in challenging low-density scenarios.
  • The model maximizes data utilization, preventing the loss of valuable information from unidentified samples.