Results 31 to 40 of about 6,176 (252)

A ubiquitous ~62 Myr periodic fluctuation superimposed on general trends in fossil biodiversity: II, Evolutionary dynamics associated with periodic fluctuation in marine diversity [PDF]

Paleobiology 37:383-408,2011, 2010
We investigate evolutionary dynamics related to periodicity fossil biodiversity. Coherent periodic fluctuation in origination/extinction of marine genera that survive <45 million years is the source of an observed ~62 million year periodicity analyzed in Paper I. We also show that the evolutionary dynamics of "long-lived" genera (those that survive >45
arxiv   +1 more source

Body mass estimation in Triassic cynodonts from Argentina based on limb variables

Acta Palaeontologica Polonica, 2022
Body mass estimations for extinct taxa are fundamental in palaeobiological reconstructions, but little work has been done on this topic for non-mammaliaform cynodonts (NMC), the diverse and abundant Permo-Cretaceous forerunners of mammals.
FLORENCIA S. FILIPPINI, FERNANDO ABDALA, GUILLERMO H. CASSINI   +2 more
doaj   +1 more source

Estimating the evolutionary rates in mosasauroids and plesiosaurs: discussion of niche occupation in Late Cretaceous seas [PDF]

PeerJ, 2020
Observations of temporal overlap of niche occupation among Late Cretaceous marine amniotes suggest that the rise and diversification of mosasauroid squamates might have been influenced by competition with or disappearance of some plesiosaur taxa.
Daniel Madzia, Andrea Cau
doaj   +2 more sources

Developmental traits and life strategy of redlichiid trilobites

Biological Reviews, Volume 98, Issue 1, Page 63-80, February 2023., 2023
ABSTRACT The developmental mode of four redlichiid trilobites is summarized, based upon exceptionally well‐preserved, articulated specimens from Cambrian Series 2 (stages 3 and 4) strata in southwestern China and South Australia. These relatively complete developmental sequences indicate a balanced rate in segment increase and addition to the thorax ...
Tao Dai, Xingliang Zhang, Shanchi Peng
wiley   +1 more source

Vanishing waters: water chemistry of temporary rock pools of the Western Ghats, India

Water Practice and Technology, 2022
The freshwater rockpools support high endemic biodiversity but are poorly studied habitats in the Western Ghats biodiversity hotspot. These freshwater rock pools are situated on outcrops at various elevations in the Western Ghats and are composed of ...
Aboli Kulkarni, Surajit Roy, Murugesan Yogeshwaran, Bhushan Shigwan, Smrithy Vijayan, Pranav Kshirsagar, Mandar N. Datar, Balasubramanian Karthick   +7 more
doaj   +1 more source

The early diversification of ray‐finned fishes (Actinopterygii): hypotheses, challenges and future prospects

Biological Reviews, Volume 98, Issue 1, Page 284-315, February 2023., 2023
ABSTRACT Actinopterygii makes up half of living vertebrate diversity, and study of fossil members during their Palaeozoic rise to dominance has a long history of descriptive work. Although research interest into Palaeozoic actinopterygians has increased in recent years, broader patterns of diversity and diversity dynamics remain critically understudied.
Struan Henderson, Emma M. Dunne, Sophie A. Fasey, Sam Giles   +3 more
wiley   +1 more source

Mesoproterozoic surface oxygenation accompanied major sedimentary manganese deposition at 1.4 and 1.1 Ga

Geobiology, Volume 21, Issue 1, Page 28-43, January 2023., 2023
Abstract Manganese (Mn) oxidation in marine environments requires oxygen (O2) or other reactive oxygen species in the water column, and widespread Mn oxide deposition in ancient sedimentary rocks has long been used as a proxy for oxidation. The oxygenation of Earth's atmosphere and oceans across the Archean‐Proterozoic boundary are associated with ...
Sam C. Spinks, Erik A. Sperling, Robert L. Thorne, Felicity LaFountain, Alistair J. R. White, Joseph Armstrong, Martijn Woltering, Ian M. Tyler   +7 more
wiley   +1 more source

Production of diverse brGDGTs by Acidobacterium Solibacter usitatus in response to temperature, pH, and O2 provides a culturing perspective on brGDGT proxies and biosynthesis

Geobiology, Volume 21, Issue 1, Page 102-118, January 2023., 2023
Abstract Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are bacterial membrane lipids that are frequently employed as paleoenvironmental proxies because of the strong empirical correlations between their relative abundances and environmental temperature and pH.
Toby A. Halamka, Jonathan H. Raberg, Jamie M. McFarlin, Adam D. Younkin, Christopher Mulligan, Xiao‐Lei Liu, Sebastian H. Kopf   +6 more
wiley   +1 more source

Bone microstructure of the sphenodont rhynchocephalian Priosphenodon avelasi and its paleobiological implications [PDF]

Acta Palaeontologica Polonica
Sphenodontians are a group of vertebrates with a vast taxonomic diversity and worldwide distribution of their fossils. Although they have been the subject of many studies on their phylogeny and morphology, those focused on their paleobiology are still ...
SOL A. CAVASIN, IGNACIO A. CERDA, SEBASTIÁN APESTEGUÍA   +2 more
doaj   +1 more source

Oxygen and carbon isotope variations in Chamelea gallina shells: Environmental influences and vital effects

Geobiology, Volume 21, Issue 1, Page 119-132, January 2023., 2023
Abstract Stable isotopes in mollusc shells, together with variable growth rates and other geochemical properties, can register different environmental clues, including seawater temperature, salinity and primary productivity. However, the strict biological control over the construction of biominerals exerted by many calcifying organisms can constrain ...
Arianna Mancuso, Ruth Yam, Fiorella Prada, Marco Stagioni, Stefano Goffredo, Aldo Shemesh   +5 more
wiley   +1 more source