Results 51 to 60 of about 787 (144)

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

Long‐term apparent survival of a cold‐stunned subpopulation of juvenile green turtles

Ecosphere, 2022
Understanding the effects of extreme weather on animal populations is fundamental to ecological and conservation sciences and species management. Climate change has resulted in both warm and cold temperature extremes, including an increased frequency of ...
Robert Mollenhauer, Margaret M. Lamont, Allen Foley   +2 more
doaj   +1 more source

Seasonal body mass dynamics mediate life‐history trade‐offs in a hibernating mammal

Journal of Animal Ecology, Volume 95, Issue 3, Page 383-396, March 2026.
We tested a suite of ecological hypotheses to explain variation in seasonal body mass dynamics of a fat‐storing mammalian hibernator. We further demonstrated that pre‐hibernation mass gain in ground squirrels mediates an annual allocation trade‐off between current and future reproduction as the squirrels forage and rear young under predation risk ...
Austin Z. T. Allison, Courtney J. Conway, Amanda R. Goldberg, Alice E. Morris, Emma C. Hakanson   +4 more
wiley   +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

Age‐Specific Survival Estimation of a Eurasian Crane Population Highlights a Long‐Term Decline in Juvenile Survival

Ecology and Evolution, Volume 16, Issue 2, February 2026.
The Eurasian crane (Grus grus), a symbol of conservation success in Europe, has made an impressive recovery. However, our results show that over the study period, juvenile survival declined by almost 30% overall, while sub‐adults experienced a smaller decrease, and adults showed no change.
Morgane Gicquel, Juan C. Alonso, Lovisa Nilsson, Matthew Low, Javier A. Alonso, Dmitrijs Boiko, Damon Bridge, Patrick Dulau, Thomas Heinicke, Anne Kettner, Yosef Kiat, Petras Kurlavičius, Sigvard Lundgren, Michael Modrow, Günter Nowald, Ivar Ojaste, Alain Salvi, Jostein Sandvik, Markéta Ticháčková, Antonio Torrijo, Jari Valkama, Zsolt Végvári, Johan Månsson   +22 more
wiley   +1 more source

Trap‐dependence in capture–recapture studies: empirical evidence in vertebrates and biological meaning

Oikos, Volume 2026, Issue 2, February 2026.
Capture–recapture (CR) models have been used for decades to estimate population size and demographic rates in natural populations from the monitoring of individuals. One of the most frequent deviations from assumptions required in CR studies is the immediate trap‐dependence that corresponds to the correlation between capture events. We review empirical
Jessica Cachelou, Jean‐Michel Gaillard, Agathe Chassagneux, Eric Baubet, Marlène Gamelon   +4 more
wiley   +1 more source

Overwintering in the East China Sea or Japan Is Linked to Concerningly Low Survival in a Migratory Shorebird

Diversity and Distributions, Volume 32, Issue 2, February 2026.
ABSTRACT Aim Site network approaches to waterbird conservation are easily biased towards species that occur in high densities and locations and periods of the annual cycle with dense concentrations of birds, thereby potentially failing to address underlying factors driving certain population declines.
Benjamin J. Lagassé, Richard B. Lanctot, Stephen C. Brown, Christopher J. Latty, Joseph R. Liebezeit, Rebecca L. McGuire, Sarah T. Saalfeld, Greg A. Breed   +7 more
wiley   +1 more source

Survival probabilities of loggerhead sea turtles (Caretta caretta) estimated from capture-mark-recapture data in the Mediterranean Sea

Scientia Marina, 2007
Survival probabilities of loggerhead sea turtles (Caretta caretta) are estimated for the first time in the Mediterranean by analysing 3254 tagging and 134 re-encounter data from this region. Most of these turtles were juveniles found at sea.
Paolo Casale, Antonios D. Mazaris, Daniela Freggi, Roberto Basso, Roberto Argano   +4 more
doaj   +1 more source

Abundancia de dos poblaciones de toninas (Tursiops truncatus) en el norte de Veracruz, México

Revista Mexicana de Biodiversidad, 2011
En México no se conoce el tamaño de las poblaciones de la tonina (Tursiops truncatus) debido a su gran movilidad y al ocasional intercambio de individuos entre poblaciones.
Michelle P. Valdes-Arellanes, Arturo Serrano, Gisela Heckel, Yolanda Schramm, Ibiza Martínez-Serrano   +4 more
doaj   +1 more source

An approach to modeling abundance of marine wildlife over space and time using unstructured aerial surveys

The Journal of Wildlife Management, Volume 90, Issue 1, January 2026.
We present an approach for estimating wildlife abundance from unstructured aerial surveys. We combine a spatial model for count data with auxiliary information on detection probability. This framework is intended to be flexible, requiring lower survey costs and less computation time than other alternatives for estimating abundance.
Timothy A. Gowan, Jennifer F. Moore, Holly H. Edwards, Ashley B. C. Goode, Julien Martin   +4 more
wiley   +1 more source