Results 21 to 30 of about 1,991,503 (333)

Range‐wide occupancy trends for the Mojave desert tortoise (Gopherus agassizii)

Ecosphere, 2023
Data from long‐term monitoring programs, such as the US Fish and Wildlife Service (USFWS) line distance sampling (LDS) program for Mojave desert tortoises (Gopherus agassizii), are increasingly being used in new ways to elucidate trends in population ...
Amanda M. Kissel, Bryan Wallace, Jesse Anderson, Brett G. Dickson, Kristen Van Neste, Vincent Landau, Roy C. Averill‐Murray, Linda J. Allison, Amy Fesnock   +8 more
doaj   +1 more source

Assessing uncertainty in sighting records: an example of the Barbary lion [PDF]

, 2015
As species become rare and approach extinction, purported sightings can be controversial, especially when scarce management resources are at stake. We consider the probability that each individual sighting of a series is valid.
Tamsin E. Lee, Reed, J. Michael, Hadi Al Hikmani, Angelici, Francesco M., Al Hikmani, Hadi, David L. Roberts, Lee, Tamsin E., Fellous, Amina, Elphick, Chris S., Francesco M. Angelici, J. Michael Reed, Amina Fellous, Roberts, David L., Michael Reed, J., Black, Simon A., Yamaguchi, Nobuyuki, Simon A. Black, Chris S. Elphick, Nobuyuki Yamaguchi   +18 more
core   +1 more source

Assortativity and the Probability of Epidemic Extinction: A Case Study of Pandemic Influenza A (H1N1-2009) [PDF]

, 2011
Unlike local transmission of pandemic influenza A (H1N1-2009), which was frequently driven by school children, most cases identified in long-distance intranational and international travelers have been adults.
Alex R. Cook, Cowling, B.J., Benjamin J. Cowling, Nishiura, H., Nishiura, H, Cook, AR, Cowling, BJ, Hiroshi Nishiura, Cook, A.R.   +8 more
core   +1 more source

Muller's ratchet and mutational meltdowns [PDF]

, 1993
We extend our earlier work on the role of deleterious mutations in the extinction of obligately asexual populations. First, we develop analytical models for mutation accumulation that obviate the need for time-consuming computer simulations in certain ...
Lynch, M., Bürger, R., Lynch, Michael, Gabriel, W., Bürger, Reinhard, W. Gabriel, M. Lynch, R. Bürger, Gabriel, Wilfried   +8 more
core   +1 more source

Modeling the effects of water regulation on the population viability of a threatened amphibian

Ecosphere, 2023
The regulation of river systems alters hydrodynamics and often reduces lateral connectivity between river channels and floodplains. For taxa such as frogs that rely on floodplain wetlands to complete their life cycle, decreasing inundation frequency can ...
Rupert Mathwin, Skye Wassens, Matthew S. Gibbs, Jeanne Young, Qifeng Ye, Frédérik Saltré, Corey J. A. Bradshaw   +6 more
doaj   +1 more source

An Analysis of CTMC Stochastic Models with Quarantine on the Spread of Tuberculosis Diseases

Journal of Mathematical and Fundamental Sciences, 2021
The SIQRS epidemic model developed in this study is intended to analyze the spread characteristics of the infectious disease tuberculosis. It is a modification of the SIQR model developed by Cao et al., using a stochastic model called the Continuous Time
Fatimatuzzahroh , Hadi Sumarno, Paian Sianturi   +2 more
doaj   +1 more source

Extinction probability and total progeny of predator-prey dynamics on infinite trees [PDF]

, 2012
We consider the spreading dynamics of two nested invasion clusters on an infinite tree. This model was defined as the chase-escape model by Kordzakhia and it admits a limit process, the birth-and-assassination process, previously introduced by Aldous and
C. Bordenave
semanticscholar   +1 more source

Geometric branching reproduction Markov processes

Modern Stochastics: Theory and Applications, 2020
We present a model of a continuous-time Markov branching process with the infinitesimal generating function defined by the geometric probability distribution.
Assen Tchorbadjieff, Penka Mayster
doaj   +1 more source

Local chronicles reveal the effect of anthropogenic and climatic impacts on local extinctions of Chinese pangolins (Manis pentadactyla) in mainland China

Ecology and Evolution, 2022
Anthropogenic and climatic factors affect the survival of animal species. Chinese pangolin is a critically endangered species, and identifying which variables lead to local extinction events is essential for conservation management.
Haiyang Gao, Hongliang Dou, Shichao Wei, Song Sun, Yulin Zhang, Yan Hua   +5 more
doaj   +1 more source

Local colonization‐extinction dynamics of a tree‐killing bark beetle during a large‐scale outbreak

Ecosphere, 2016
Forest pest insects may cause large‐scale tree growth reductions and tree mortality during outbreaks. The large‐scale development of outbreaks has frequently been studied, while the colonization‐extinction dynamics during outbreaks is less known.
S. Kärvemo, V. Johansson, M. Schroeder, T. Ranius   +3 more
doaj   +1 more source