Results 41 to 50 of about 1,461,213 (320)

Network topology drives population temporal variability in experimental habitat networks

Population Ecology, EarlyView.
Habitat patches connected by dispersal pathways form habitat networks. We explored how network topology affects population outcomes in laboratory experiments using a model species (Daphnia carinata). Central habitat nodes in complex lattice networks exhibited lower temporal variability in population sizes, suggesting they support more stable ...
Yiwen Xu, J. Angus Webb, William D. Bovill, Elise L. King   +3 more
wiley   +1 more source

Exploring the randomness of Directed Acyclic Networks [PDF]

, 2010
The feed-forward relationship naturally observed in time-dependent processes and in a diverse number of real systems -such as some food-webs and electronic and neural wiring- can be described in terms of so-called directed acyclic graphs (DAGs).
Bernat Corominas-Murtra, C. E. Shannon, Carlos Rodríguez-Caso, H. Frank, J. Kelley, Joaquín Goñi, P. Suppes, R. Clay, R. V. Sole, Ricard V. Solé, S. Haykin, S. N. Dorogovtsev, W. Aiello   +12 more
core   +2 more sources

Geographic variation in walking activity in the red flour beetle Tribolium castaneum

Population Ecology, EarlyView.
This study examined whether there is geographic variation in field populations, focusing on the moving activity in the red flour beetle Tribolium castaneum. Results showed significant differences in moving activity among field populations but no correlation with latitude or meteorological factors.
Kentarou Matsumura
wiley   +1 more source

Online Matching with General Arrivals

, 2019
The online matching problem was introduced by Karp, Vazirani and Vazirani nearly three decades ago. In that seminal work, they studied this problem in bipartite graphs with vertices arriving only on one side, and presented optimal deterministic and ...
Gamlath, Buddhima, Kapralov, Michael, Maggiori, Andreas, Svensson, Ola, Wajc, David   +4 more
core   +1 more source

occumb: An R package for site occupancy modeling of eDNA metabarcoding data

Population Ecology, EarlyView.
This study introduces a new R package, occumb, for the convenient application of site occupancy modeling using environmental DNA (eDNA) metabarcoding data. We outline a data analysis workflow, including data setup, model fitting, model assessment, and comparison of potential study settings based on model predictions, all of which can be performed using
Keiichi Fukaya, Yuta Hasebe
wiley   +1 more source

Convergence Speed of Bermudan, Randomized Bermudan, and Canadian Options

Mathematics
American options have long received considerable attention in the literature, with numerous publications dedicated to their pricing. Bermudan and randomized Bermudan options are broadly used to estimate their prices efficiently.
Guillaume Leduc
doaj   +1 more source

Randomness of random networks: A random matrix analysis [PDF]

EPL (Europhysics Letters), 2009
We analyze complex networks under random matrix theory framework. Particularly, we show that $ _3$ statistic, which gives information about the long range correlations among eigenvalues, provides a qualitative measure of randomness in networks. As networks deviate from the regular structure, $ _3$ follows random matrix prediction of linear behavior ...
Jalan, S., Bandyopadhyay, J.N.
openaire   +4 more sources

Between Droughts and Floods: The Seasonal Response of Freshwater Snails in Artificial Reservoirs in the Brazilian Semiarid Region

Population Ecology, EarlyView.
We investigate the seasonal dynamics of two freshwater snails, Biomphalaria straminea and Melanoides tuberculata, in artificial reservoirs of the Brazilian semiarid region. Despite regulated hydrology, B. straminea exhibited strong seasonal fluctuations associated with dry periods, while M. tuberculata maintained stable populations throughout the year,
Lucas Henrique Sousa da Silva, João Hemerson de Sousa, Adriana Josefa da Rocha, Manuella Feitosa Leal, Lucas Ariel de Sousa Aguiar, Tamaris Gimenez Pinheiro, Edson Lourenço da Silva   +6 more
wiley   +1 more source

Accuracy and distribution of baseline categorical variables and p-values in spine randomized controlled trials

Royal Society Open Science
Levayer and colleagues assessed integrity issues in randomized controlled trials (RCTs) in four spine journals using baseline p-values from categorical variables, concluding that there was no evidence of ‘systemic fraudulent behaviour’.
Mark J. Bolland, Alison Avenell, Andrew Grey   +2 more
doaj   +1 more source

Random Walks in Random Environments [PDF]

, 2006
Random walks provide a simple conventional model to describe various transport processes, for example propagation of heat or diffusion of matter through a medium. However, in many practical cases the medium is highly irregular due to defects, impurities, fluctuations etc., and it is natural to model this as random environment.
openaire   +3 more sources