Results 71 to 80 of about 10,094 (209)

Wood density variation across an Andes‐to‐Amazon elevational gradient

Journal of Ecology, Volume 113, Issue 9, Page 2370-2385, September 2025.
We study how wood density varies along a 3500‐m elevational gradient, spanning from the Andean tree line to the Amazon basin. Our results reveal that wood density decreases from low to mid‐elevations, then increases toward the tree line. These patterns underscore the influence of species composition, life forms such as tree ferns, and local ...
William Farfan‐Rios, Sassan Saatchi, Imma Oliveras Menor, Yadvinder Malhi, Chelsea M. Robinson, Oliver L. Phillips, Alex Nina‐Quispe, Juan A. Gibaja, Israel Cuba, Karina Garcia‐Cabrera, Norma Salinas, John Terborgh, Nigel Pitman, Rodolfo Vasquez, Abel Monteagudo Mendoza, Percy Nunez Vargas, Craig A. Layman, Miles R. Silman   +17 more
wiley   +1 more source

Integro-differential equation with Cauchy kernel

Journal of Computational and Applied Mathematics, 2001
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +3 more sources

Distinguishing passive and driven trait evolution in the presence of boundaries

Methods in Ecology and Evolution, Volume 16, Issue 9, Page 2067-2081, September 2025.
Abstract Quantifying the dynamics of macroevolutionary trends, such as changes in body size and complexity, is vital for understanding the processes that have shaped patterns of extant and extinct biodiversity. For example, whilst maximum body size may tend to increase within lineages (the Cope‐Depéret rule), it is still unclear whether such patterns ...
Elliot M. Butterworth, Tim Rogers, Matthew A. Wills   +2 more
wiley   +1 more source

Adjoint systems and Green functionals for second-order linear integro-differential equations with nonlocal conditions

Electronic Journal of Differential Equations, 2015
In this work, we generalize so called Green's functional concept in literature to second-order linear integro-differential equation with nonlocal conditions. According to this technique, a linear completely nonhomogeneous nonlocal problem for a second-
Ali Sirma
doaj  

Optimal control of axial dispersion tubular reactors with recycle: Addressing state‐delay through transport PDEs

The Canadian Journal of Chemical Engineering, Volume 103, Issue 8, Page 3751-3766, August 2025.
The boundary‐regulated distributed parameter system of an axial dispersion tubular reactor with delayed recycle is showcased, along with the optimal observer‐based control strategy developed using a late‐lumping method for its stabilization. Abstract The optimal control of an axial tubular reactor with a recycle stream is addressed as a key type of ...
Behrad Moadeli, Guilherme Ozorio Cassol, Stevan Dubljevic   +2 more
wiley   +1 more source

Plankton Communities Behave Chaotically Under Seasonal or Stochastic Temperature Forcings

Ecology and Evolution, Volume 15, Issue 8, August 2025.
Periodic forcing can drive a system into chaos when the autonomous system exhibits periodic behavior. In contrast, stochastic forcing has the potential to induce chaos regardless of the underlying dynamics of the autonomous system. ABSTRACT Chaos is observed in natural systems, especially in ecosystems with populations characterized by a short ...
Guido Occhipinti, Cosimo Solidoro, Roberto Grimaudo, Davide Valenti, Paolo Lazzari   +4 more
wiley   +1 more source

New Approaches to Assess Food Web Stability in Aquatic Ecosystems: A Case Study on Baiyangdian Lake

Ecology and Evolution, Volume 15, Issue 8, August 2025.
A method for calculating the interaction strength of a phytoplankton‐based and a detritus food web. A geometric mean ratio of predator‐to‐prey biomass BCBPt$$ {\left(\frac{B_C}{B_P}\right)}_t $$ as an alternative indicator for food web stability. The changes in the stability of the BYD Lake from the 1950s to the 2010s indicate that two steady‐state ...
Yong Zeng, Wei Yang, Yanwei Zhao
wiley   +1 more source

An existence theorem for an integro-differential equation

Journal of Mathematical Analysis and Applications, 1978
AbstractIn this paper we obtain an existence theorem for an integro-differential equation of the type u(s)+∫ω K(s,t) ∑α|⩽m (−1)|α| DαBα(t,ξ(u)(t)) dt=0. Hence ξ(u)(t) = {Dαu(t) : ¦ α ¦ ⩽ m} and Bα is a function of Ω × RSm in to R1.We assume that Bα satisfies “Nemytskii type” growth condition and also a monotonicity type condition.
openaire   +2 more sources

Analytic-Approximate Solution For An Integro- Differential Equation Arising In Oscillating Magnetic Fields Using Homotopy Analysis Method [PDF]

Iranian Journal of Optimization, 2013
In this paper, we give an analytical approximate solution for an integro- differential equation which describes the charged particle motion for certain configurations of oscillating magnetic fields is considered.
H. Saberi-Nik, S. Effati, R. Buzhabadi
doaj  

Symmetries of Integro-Differential Equations [PDF]

, 2010
This book aims to coherently present applications of group analysis to integro-differential equations in an accessible way. The book will be useful to both physicists and mathematicians interested in general methods to investigate nonlinear problems using symmetries.
Vladimir F. Kovalev, Nail H. Ibragimov, Sergey V. Meleshko, Yurii N. Grigoriev   +3 more
openaire   +2 more sources