Results 71 to 80 of about 34,326 (336)

Possible Origin of Stagnation and Variability of Earth's Biodiversity

, 2014
The magnitude and variability of Earth's biodiversity have puzzled scientists ever since paleontologic fossil databases became available. We identify and study a model of interdependent species where both endogenous and exogenous impacts determine the ...
Geisel, Theo, Nagler, Jan, Stollmeier, Frank   +2 more
core   +1 more source

Investigating Variation in the Prevalence of Weathering in Faunal Assemblages in the UK: A Multivariate Statistical Approach [PDF]

, 2012
This article presents an exploratory multivariate statistical approach to gaining a more comprehensive understanding of variation in subaerial bone weathering in a British context.
Andrews, Bar-Oz, Behrensmeyer, Behrensmeyer, Behrensmmeyer, Binford, Boaz, Butler, Carlson, Chanesta, Collins, Conard, Currey, Currey, Dirrigl, Elkin, Endt, Enloe, Fernández-Jalvo, Fisher, Frison, Galloway, Gifford, Gifford-Gonzales, Hedges, Hedges, Henderson, Hill, Ioannidou, Kinnear, Kooyman, Kreutzer, Lam, Lam, Lam, Lam, Lam, Lambert, Lyman, Lyman, Lyman, Lyman, Maat, Madgwick, Madgwick, Millard, Munson, Munson, Murphy, Nicholson, Outram, Pavao, Pinto Llona, Potts, Potts, Purdy, Randall, Riclefs, Ross, Russell, Saunders, Serjeantson, Serjeantson, Smith, Steele, Stiner, Symmons, Symmons, Tappen, Tappen, Todisco, Trueman, Willey, Wood   +73 more
core   +1 more source

The lower jaw of Devonian ray‐finned fishes (Actinopterygii): Anatomy, relationships, and functional morphology

The Anatomical Record, EarlyView.
Abstract Actinopterygii is a major extant vertebrate group, but limited data are available for its earliest members. Here we investigate the morphology of Devonian actinopterygians, focusing on the lower jaw. We use X‐ray computed tomography (XCT) to provide comprehensive descriptions of the mandibles of 19 species, which span the whole of the Devonian
Ben Igielman, Rodrigo Tinoco Figueroa, Robert R. Higgins, Stephanie E. Pierce, Michael I. Coates, Emily M. Troyer, Vincent Fernandez, Kathleen Dollman, Jing Lu, Min Zhu, Matt Friedman, Sam Giles   +11 more
wiley   +1 more source

Power, competition, and the nature of history [PDF]

, 2019
Historians have debated whether pathways and events from the past to the present are influenced largely by contingency, the dependence of outcomes on particular prior conditions, or whether there is long-term emergent directional change.
Vermeij, Geerat J
core   +1 more source

Molluscs from a shallow-water whale-fall and their affinities with adjacent benthic communities on the Swedish west coast [PDF]

, 2013
We conducted a species-level study of molluscs associated with a 5-m long carcass of a minke whale at a depth of 125 m in the Kosterfjord (North Sea, Sweden).
Dahlgren, TG, Danise, S, Dominici, S, Glover, AG   +3 more
core   +3 more sources

Functional anatomy, jaw mechanisms, and feeding behavior of Dunkleosteus terrelli (Placodermi, Arthrodira)

The Anatomical Record, EarlyView.
A new musculoskeletal reconstruction and revision of the cranio‐mandibular anatomy of the Devonian arthrodire placoderm Dunkleosteus terrelli from a comparative and functional anatomical perspective. Dunkleosteus is a specialized arthrodire with many specializations for feeding on large vertebrates, and many of its features are part of broader ...
Russell K. Engelman, Robert K. Carr, Kate Trinajstic, Zerina Johanson, Oleg A. Lebedev   +4 more
wiley   +1 more source

Ecological succession of a Jurassic shallow-water ichthyosaur fall. [PDF]

, 2014
After the discovery of whale fall communities in modern oceans, it has been hypothesized that during the Mesozoic the carcasses of marine reptiles created similar habitats supporting long-lived and specialized animal communities.
A Glover, A Kaim, A Kaim, A Kaim, A Sheldon, C Bristow, C Clausen, C Gaillard, C Smith, C Smith, CE Braby, CR Smith, DL Distel, DM Martill, DM Martill, DM Martill, F Garcia-Pichel, F Garcia-Pichel, G Bianucci, H Astibia, HS Chafetz, J Taylor, JA Hogler, JA Hogler, JA Massare, JW Deming, K Amano, K Duff, K Olu-Le Roy, L Lundsten, LA Levin, M Hrs-Brenko, ME Jans, ME Williams, P Dando, PA Allison, PB Wignall, PD Taylor, R Bromley, R Motani, R Motani, R Riding, R Twitchett, R Vrijenhoek, RC Vrijenhoek, RS Shapiro, S Danise, S Danise, S Danise, S Danise, S Dominici, S Golubic, S Kiel, S Kiel, S Kiel, T Treude, V De Buffrenil, V Thiel, Z Lewy   +58 more
core   +3 more sources

A detailed redescription of a skeletally immature ‘Redondasaurus’ suggests ontogenetic transformations in the taxon mirror phytosaurian morphological evolution

The Anatomical Record, EarlyView.
Abstract The study of morphological evolution is fundamentally tied to ontogeny, yet studies of these heterochronic processes in the fossil record are rare. Fossils belonging to an ontogenetic series are difficult to assign to an ontogenetic stage due to inconsistent proxies for skeletal ages, challenging to taxonomically assign due to morphological ...
Erika R. Goldsmith, Michelle R. Stocker
wiley   +1 more source

Speleothem and biofilm formation in a granite/dolerite cave, Northern Sweden

International Journal of Speleology, 2014
Tjuv-Antes grotta (Tjuv-Ante's Cave) located in northern Sweden is a round-abraded sea cave ('tunnel cave'), about 30 m in length, formed by rock-water abrasion in a dolerite dyke in granite gneiss. Abundant speleothems are restricted to the inner, mafic
Therese Sallstedt, Magnus Ivarsson, Johannes Lundberg, Rabbe Sjöberg, Juan Ramón Vidal Romaní   +4 more
doaj   +1 more source

Stable isotopes and predation marks shed new light on ammonoid habitat depth preferences

Scientific Reports, 2021
Ammonoids are extinct cephalopods with external shells which predominated in many late Paleozoic and Mesozoic marine ecosystems. Stable isotope data from ammonoid shells constitute primary tools for understanding their palaeohabitats.
Marcin Machalski, Krzysztof Owocki, Zofia Dubicka, Oksana Malchyk, Weronika Wierny   +4 more
doaj   +1 more source