Results 61 to 70 of about 339 (176)

The Effects of Land‐Use Dynamics on Avian Phylogenetic Diversity Across Island Ecosystems

Journal of Biogeography, Volume 53, Issue 7, July 2026.
ABSTRACT Aim To test whether forest extent and recent forest‐cover change are associated with avian phylogenetic diversity and community‐level evolutionary value across islands. Location Seven islands spanning Borneo and Wallacea in the Malay Archipelago. Taxon Terrestrial birds. Methods We sampled 1410 sites (2010–2022).
Halvina G. Saiya, David P. Edwards, Matthew J. Struebig, David J. I. Seaman, Robby Butarbutar, Nurul L. Winarni, Simon L. Mitchell, Jatna Supriatna, Rob W. Martin, Adi Karya, Robert P. Freckleton   +10 more
wiley   +1 more source

Indivisible ultrametric spaces

Topology and its Applications, 2008
A metric space is indivisible if for any partition of it into finitely many pieces one piece contains an isometric copy of the whole space. Continuing our investigation of indivisible metric spaces, we show that a countable ultrametric space embeds isometrically into an indivisible ultrametric metric space if and only if it does not contain a strictly ...
Delhommé, Christian, Laflamme, Claude, Pouzet, Maurice, Sauer, Norbert   +3 more
openaire   +4 more sources

Climate, Continental Breakup and Habitat Shape Global Diversification and Biogeography of Turtles (Testudines)

Journal of Biogeography, Volume 53, Issue 7, July 2026.
ABSTRACT Aim Evaluate the relative contributions of palaeotemperature, palaeogeographic reconfiguration, and habitat heterogeneity to the diversification and biogeographic history of turtles (Order Testudines) from the Triassic to the present. Location and Time Period Global; Triassic–Recent.
Zhongning Zhao, Chad Keates, J. Paul Grobler, Phillip. A. Bester, Stephanus Riekert, Neil Heideman   +5 more
wiley   +1 more source

Orderability and continuous selections for Wijsman and Vietoris hyperspaces

Applied General Topology, 2003
Bertacchi and Costantini obtained some conditions equivalent to the existence of continuous selections for the Wijsman hyperspace of ultrametric Polish spaces. We introduce a new class of hypertopologies, the macro-topologies.
Debora Di Caprio, Stephen Watson
doaj   +1 more source

p-adic numbers encode complex networks

Scientific Reports, 2021
The Erdős-Rényi (ER) random graph G(n, p) analytically characterizes the behaviors in complex networks. However, attempts to fit real-world observations need more sophisticated structures (e.g., multilayer networks), rules (e.g., Achlioptas processes ...
Hao Hua, Ludger Hovestadt
doaj   +1 more source

Profundum solomoni (Amphipoda: Uristidae) Exhibits a Disjunct Geographic Distribution at Hadal Depths Across the San Cristobal Trench, Santa Cruz Trench and Nova Canton Trough

Zoologica Scripta, Volume 55, Issue 4, Page 639-651, July 2026.
ABSTRACT Hadal environments (> 6000 m ocean depths) are often viewed as isolated locations with high species endemism due to limited dispersal. However, molecular studies continue to reveal greater complexity that questions historical perceptions. Recent population genetic studies focused on scavenging amphipods have identified broadly distributed ...
Brett C. Gonzalez, Jennifer A. Wainwright, Alan J. Jamieson   +2 more
wiley   +1 more source

Mal'tsev objects, R_1-spaces and ultrametric spaces

Theory and Applications of Categories, 2017
In this paper we introduce a notion of Mal'tsev object, and the dual notion of co-Mal'tsev object, in a general category. In particular, a category $\mathbb{C}$ is a Mal'tsev category if and only if every object in $\mathbb{C}$ is a Mal'tsev object.
openaire   +3 more sources

Hyperbolic Metric Spaces and Stochastic Embeddings

Forum of Mathematics, Sigma
Stochastic embeddings of finite metric spaces into graph-theoretic trees have proven to be a vital tool for constructing approximation algorithms in theoretical computer science.
Chris Gartland
doaj   +1 more source

Fecal DNA Identifies a Disjunct Population of an Endemic Deer (Mazama jucunda) From the Atlantic Forest, Brazil

Animal Genetics, Volume 57, Issue 3, June 2026.
ABSTRACT Limited knowledge of brocket deer distribution persists due to their elusive behavior and the morphological similarities among species. A population of red brocket deer (genus Mazama) was recently discovered in the Rio Doce State Park (PERD), a protected area within the Brazilian Atlantic Forest; however, species‐level identification was ...
Jeferson L. S. Freitas, Pedro H. F. Peres, Francisco Grotta‐Neto, Márcio L. Oliveira, José M. B. Duarte   +4 more
wiley   +1 more source

Ramsey degrees of finite ultrametric spaces, ultrametric Urysohn spaces and dynamics of their isometry groups [PDF]

European Journal of Combinatorics, 2009
We study Ramsey-theoretic properties of several natural classes of finite ultrametric spaces, describe the corresponding Urysohn spaces and compute a dynamical invariant attached to their isometry groups.
openaire   +2 more sources