Results 111 to 120 of about 336,431 (337)

The shape of ecological networks

, 2001
We study the statistics of ecosystems with a variable number of co-evolving species. The species interact in two ways: by prey-predator relationships and by direct competition with similar kinds.
Angelo Valleriani, B. Drossel, B. Drossel, E. C. Pielou, G. Caldarelli, J. Camacho, J. E. Cohen, J. E. Cohen, J. Maynard Smith, J. Maynard Smith, L. A. Nunes Amaral, L.-F. Bersier, M. A. Leibold, M. L. Rosenzweig, Michael Lässig, N. C. Stenseth, P. H. Warren, R. J. Williams, R. M. May, R. May, R. V. Solé, R. V. Solé, S. J. Gould, S. L. Pimm, Susanna C. Manrubia, Ugo Bastolla, W. C. Allee   +26 more
core   +1 more source

New techniques for old bones: Morphometric and diffeomorphometric analysis of the bony labyrinth of the Reilingen and Ehringsdorf Neandertals

The Anatomical Record, EarlyView.
Abstract Neandertals are known to possess very distinctive traits in their bony labyrinth morphology, such as an inferiorly positioned posterior canal and a very low number of turns in the cochlea. Hence, the inner ear has been often used to assess the Neandertal status of fragmentary fossils.
Alessandro Urciuoli, Julia Diez‐Valero, Ignacio Martínez, Rolf Quam, Brian A. Keeling, Nicole M. Webb, Mercedes Conde‐Valverde   +6 more
wiley   +1 more source

Does spatial variation in predation pressure modulate selection for aposematism?

Ecology and Evolution, 2017
It is widely believed that aposematic signals should be conspicuous, but in nature, they vary from highly conspicuous to near cryptic. Current theory, including the honest signal or trade‐off hypotheses of the toxicity–conspicuousness relationship ...
S. Tharanga Aluthwattha, Rhett D. Harrison, Kithsiri B. Ranawana, Cheng Xu, Ren Lai, Jin Chen   +5 more
doaj   +1 more source

Histology and fossil diagenesis of a pterosaur tooth from the Crato Formation (Lower Cretaceous of Brazil)

The Anatomical Record, EarlyView.
Abstract Pterosaur dental biology remains poorly understood despite its importance for comprehending feeding strategies and flight adaptations. Here, we present the first comprehensive histological analysis of an ornithocheiriform pterosaur tooth from the Lower Cretaceous Crato Formation (Santana Group, Northeast Brazil).
Tito Aureliano, Matheus P. S. Rocha, Francisco P. Lima‐Filho, Aline M. Ghilardi   +3 more
wiley   +1 more source

Persistence of Monopoly, Innovation, and R-and-D Spillovers: Static versus Dynamic Analysis [PDF]

We build a dynamic duopoly model that accounts for the empirical observation of monopoly persistence in the long run. More specifically, we analyze the conditions under which it is optimal for the market leader in an initially duopoly setup to undertake ...
Eugen Kovac, Kresimir Zigic, Viatcheslav Vinogradov   +2 more
core  

A jump-growth model for predator-prey dynamics: derivation and application to marine ecosystems

, 2010
This paper investigates the dynamics of biomass in a marine ecosystem. A stochastic process is defined in which organisms undergo jumps in body size as they catch and eat smaller organisms. Using a systematic expansion of the master equation, we derive a
A. Okubo, A.G. McKendrick, C.-H. Hsieh, C.A. Pfister, C.N.K. Anderson, D. Finkelshtein, D.C. Bardos, D.J. Aldous, D.M. Ware, D.T. Gillespie, D.T. Gillespie, E. Benoît, Gustav W. Delius, H. Foerster von, J. Camacho, J.E. Cohen, J.E. Paloheimo, J.H. Brown, J.L. Blanchard, K.H. Andersen, K.H. Andersen, M. Smoluchowski, M.R. Heath, N.G. Kampen van, O. Maury, P.A. Marquet, P.R. Boudreau, R. Law, R.W. Sheldon, R.W. Sheldon, Richard Law, S. Jennings, S.R. Kerr, Samik Datta, T. Platt, W. Silvert, W. Silvert, W.H. Press, W.S.C. Gurney, Y.-J. Shin   +39 more
core   +1 more source

Bacterial predators [PDF]

Current Biology, 2009
Velicer, Gregory J., Mendes-Soares, Helena   +1 more
openaire   +2 more sources

Endothermy, neuron counts, and other issues: Further remarks on neurocognitive evolution in fossil vertebrates

The Anatomical Record, EarlyView.
Abstract Last year, we challenged the view that large‐bodied theropod dinosaurs such as Tyrannosaurus rex resembled primates in cognition and behavior, a proposition made by Herculano‐Houzel in 2023. More recently, Jensen et al. have criticized our work on this topic, raising methodological and conceptual issues.
Kai R. Caspar, Cristián Gutiérrez‐Ibáñez, Hady George, Thomas R. Holtz Jr., Darren Naish, Grant R. Hurlburt   +5 more
wiley   +1 more source

Sentinel prey settings differ in their ability to distinguish organic from conventional apple orchards and in their sensitivity to weather conditions during field exposure

Biological Control
Determining factors that affect pest predation by natural enemies is essential for designing cropping systems that promote conservation biological control.
Claire Lavigne, Bertrand Gauffre, Cécile Thomas, Jean-Charles Bouvier, Xavier Said, Filipa Knapen, Jérôme Olivares, Alexis Cavazzini, Pierre Franck   +8 more
doaj   +1 more source

Comparative cranial biomechanics reveal macroevolutionary trends in theropod dinosaurs, with emphasis on Tyrannosauroidea

The Anatomical Record, EarlyView.
Abstract Tyrannosaurus is viewed as a model organism in vertebrate paleontology, with numerous studies analyzing its feeding biomechanics. Nonetheless, the evolution of this feeding performance has been under‐addressed in Tyrannosauroidea, especially in basal tyrannosauroids. Here we used muscle‐force reconstruction and finite element analysis (FEA) to
Evan Johnson‐Ransom, Paul Gignac, Daniel E. Barta, Ryan N. Felice, Eric Snively   +4 more
wiley   +1 more source