Results 41 to 50 of about 824 (154)

A comparison of monitoring methods for inferring demographics of a pond‐breeding amphibian population over 14 years

The Journal of Wildlife Management, Volume 90, Issue 6, August 2026.
We used 4 sampling methods to estimate or index the abundance and sex ratio of spotted salamanders (Ambystoma maculatum) over 14 years. The present study highlights the importance of considering individual heterogeneity in capture probability when estimating abundance of pond‐breeding amphibians from capture data with imperfect detection. Abstract Long‐
Patrick D. Moldowan, Doug P. Armstrong, Glenn J. Tattersall, Njal Rollinson   +3 more
wiley   +1 more source

Population ecology of Chaetophractus vellerosus: the first report for an armadillo in South America

Zoologia (Curitiba), 2017
The aim of this work was to obtain the first estimates of survival rates (S), capture probability (p) and life expectancy for armadillos in South America by analyzing capture-mark-recapture data obtained from a population of Chaetophractus vellerosus ...
Agustín M. Abba, Veronica V. Benitez, Santiago R. Doyle   +2 more
doaj   +1 more source

Demographic responses to population recovery illustrated by 30 years of monitoring a once critically endangered parrot

Journal of Applied Ecology, Volume 63, Issue 8, August 2026.
These findings highlight the dynamic nature of demographic processes throughout population recovery and emphasise the value of continued monitoring beyond apparent recovery to detect density‐dependent shifts in demographic rates of wildlife populations.
Adrien Gellé, Malcolm A.C. Nicoll, Esther F. Kettel, Angelo P. Pernetta, Helen Gath, Jim Groombridge, Sion Henshaw, Carl G. Jones, Kevin Ruhomaun, Vikash Tatayah, Ken Norris, Simon Tollington   +11 more
wiley   +1 more source

Residual diagnostics for assessing closed population capture–recapture models

Methods in Ecology and Evolution, Volume 17, Issue 8, Page 2277-2284, August 2026.
Abstract Capture–recapture models provide a statistical framework for estimating demographic parameters from incomplete observation data, where not all individuals in a population are detected during sampling. Assessing the fit of such models is crucial for reliable inference.
Jakub Stoklosa, Bernice Laitly, Pierre Lafaye de Micheaux   +2 more
wiley   +1 more source

High Levels of Straying in Returning, Repeat‐Spawning Atlantic Salmon Between Two Neighbouring Danish Rivers

Ecology and Evolution, Volume 16, Issue 7, July 2026.
We studied the seaward and return migration of Atlantic salmon kelts from both wild and hatchery origin in River Skjern, Denmark. Of the 199 tagged animals, 110 reached the ocean (55%). Only 10 kelts were recorded returning after spending more than 1 year at sea.
Hugo Flávio, Lene Klubben Sortland, Kim Birnie‐Gauvin, Anders Koed, Søren Larsen, Kim Aarestrup   +5 more
wiley   +1 more source

Accounting for heterogeneity when estimating stopover duration, timing and population size of red knots along the Luannan Coast of Bohai Bay, China

Ecology and Evolution, 2019
To successfully perform their long‐distance migrations, migratory birds require sites along their migratory routes to rest and refuel. Monitoring the use of so‐called stopover and staging sites provides insights into (a) the timing of migration and (b ...
Tamar Lok, Chris J. Hassell, Theunis Piersma, Roger Pradel, Olivier Gimenez   +4 more
doaj   +1 more source

Extreme polygyny results in intersex differences in age-dependent survival of a highly dimorphic marine mammal

Royal Society Open Science, 2023
Developmental differences in vital rates are especially profound in polygamous mating systems. Southern elephant seals (Mirounga leonina) are highly dimorphic and extremely polygynous marine mammals.
Sophia Volzke, Jaimie B. Cleeland, Mark A. Hindell, Stuart P. Corney, Simon J. Wotherspoon, Clive R. McMahon   +5 more
doaj   +1 more source

Spatially explicit capture–recapture models for relative density

Ecology, Volume 107, Issue 7, July 2026.
Abstract Spatially explicit capture–recapture (SECR) methods are used widely to estimate animal population density and related parameters. Maximum likelihood has been applied to two flavors of the SECR model—a full model that includes absolute density as a spatially varying parameter, and a model conditional on the number of detected individuals that ...
Murray G. Efford
wiley   +1 more source

Evaluation of abundance indexes in open population studies: a comparison in populations of small mammals in southern Brazil

Brazilian Journal of Biology
Many manuscripts comparing populations and/or analysing the structure of animal communities use indexes of captures as synonymous of abundance. However, the basic methods more suitable to this assumption - probabilistic estimates based on equal capture ...
ME Graipel, MIM Hernández, C Salvador
doaj   +1 more source

Estimation of Time-Specific Survival Rates from Tag-Resighting Samples: A Generalization of the Jolly-Seber Model [PDF]

Biometrics, 1983
On étudie le comportement d'animaux capturés, marqués puis remis en liberté, en les observent plutot qu'en les recapturent on étudie ainsi l'influence de la capture et du marquage sur leur survie. On généralise ici les modèles de Cormack et de Jolly-Seber, qui ont le défaut de considérer que la capture n'influe pas sur leur survie, et dont les ...
Brownie, C., Robson, D. S.
openaire   +1 more source