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Asymmetric Migration Shapes Genetic Structure of the Invasive Avian Vampire Fly (Philornis downsi) Across the Galápagos Islands

Molecular Ecology, Volume 35, Issue 21, November 2026.
ABSTRACT Biological invasions on islands provide a natural framework to study how dispersal and connectivity influence evolutionary and ecological processes. The avian nest parasitic fly, Philornis downsi—first recorded in Darwin's finch nests in 1997—causes high mortality in endemic land birds, yet its inter‐island and sex‐specific patterns of ...
Abbie C. Hay +9 more
wiley +1 more source

Multivalued weakly picard operators and some fixed point results [PDF]

, 2017
Bu tez çalışmasında, temel olarak küme değerli zayıf Picard operatörler ve bazı sabit nokta sonuçları incelenmiştir. İlk olarak, tez boyunca kullanılacak metrik uzay ile ilgili temel tanımlar, bazı teoremler ve ?-büzülme dönüşümü verilmiştir.
Kanyılmaz, Sema
core

Stancu modified operators revisited

Journal of Numerical Analysis and Approximation Theory, 2002
In this paper we construct a general positive approximation process representing an integral form in Kantorovich sense of the Stancu operators. By using K-functionals and some moduli of smoothness we give direct theorems for pointwise approximation. Also,
Octavian Agratini
doaj +2 more sources

Some remarks on modified picard operators preserving some exponential functions

, 2020
In the present paper, we investigate the convergence properties of a class of modified Picard operators in exponential weighted Lebesgue spaces. © 2020, Research Publication.
Uysal, G., G. Uysal
core +1 more source

Fixed point results for contractions of polynomial type

Demonstratio Mathematica
We introduce two new classes of single-valued contractions of polynomial type defined on a metric space. For the first one, called the class of polynomial contractions, we establish two fixed point theorems.
Jleli Mohamed, Păcurar Cristina Maria, Samet Bessem +2 more
doaj +1 more source

Existence and Stability of Solutions for p-Proportional ω-Weighted κ-Hilfer Fractional Differential Inclusions in the Presence of Non-Instantaneous Impulses in Banach Spaces

Fractal and Fractional
In this work, we introduce a new definition for the fractional differential operator that generalizes several well-known fractional differential operators.
Feryal Aladsani, Ahmed Gamal Ibrahim
doaj +1 more source

Some results on order weakly compact operators [PDF]

, 1981
summary:We establish some properties of the class of order weakly compact operators on Banach lattices. As consequences, we obtain some characterizations of Banach lattices with order continuous norms or whose topological duals have order continuous ...
Aqzzouz, Belmesnaoui +3 more
core +1 more source

Fixed point theory for multivalued φ-contractions

Fixed Point Theory and Applications, 2011
The purpose of this paper is to present a fixed point theory for multivalued φ-contractions using the following concepts: fixed points, strict fixed points, periodic points, strict periodic points, multivalued Picard and weakly Picard operators ...
Lazăr Vasile
doaj

Multivalued Pseudo-Picard Operators and Fixed Point Results

, 2020
We introduce the concept of multivalued pseudo-Picard (MPP) operator on a metric space. This concept is weaker than multivalued weakly Picard (MWP) operator, which is given by M.
Özlem Acar, Ishak Altun, Gülhan Mjnak
core

On discrete Picard operators

, 2016
Bascanbaz-Tunca, Gulen/0000-0003-3216-1661;The present paper is concerned with the approximation properties of discrete version of Picard operators. We first give exact equalities for the moments of the operators.
Ali Aral +6 more
core +1 more source

contraction principle
fixed point
bernstein type operators

weakly picard operator
multivalued weakly picard operator
mathematics

data dependence