Results 41 to 50 of about 1,020 (210)

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

Body Size and Symmetry Properties of Termite Soldiers Under Two Intraspecific Competition Scenarios

Frontiers in Ecology and Evolution, 2022
Single-piece nesting termites live and forage in the same piece of wood throughout their life, which limit their colony size. In certain species, more than one colony thrive in a given piece of wood (multicolonial substrate) and intraspecific competition
Daniel Aguilera-Olivares, Bárbara Torres-Guzmán, Alberto Arab, Luis Flores-Prado, Hermann M. Niemeyer   +4 more
doaj   +1 more source

GRAY WOLF POPULATION PROJECTION WITH INTRASPECIFIC COMPETITION

Natural Resource Modeling, 2014
AbstractCompetition effects are incorporated into a model of wolf‐population dynamics. A classic single‐state model is augmented into a dual‐state mapping of the evolution of the size of wolf packs and the number of wolf packs. This dual‐state model, unlike the single‐state density dependent model, is amenable to analyzing intraspecific competition ...
Hochard, J., Finnoff, D.
openaire   +1 more source

Nasal soft‐tissue anatomy of Triceratops and other horned dinosaurs

The Anatomical Record, EarlyView.
Abstract Although ceratopsid dinosaurs possess a characteristically hypertrophied narial region, soft‐tissue anatomy associated with such a skeletal structure and their biological significance remain poorly understood. The present study provides the first comprehensive hypothesis on the soft‐tissue anatomy in the ceratopsid rostrum based on the Extant ...
Seishiro Tada, Takanobu Tsuihiji, Hiroki Ishikawa, Noriyuki Wakimizu, Soichiro Kawabe, Kodai Sakane   +5 more
wiley   +1 more source

Interspecific and intraspecific competition of A. trifida and A. artemisiifolia [PDF]

Acta herbologica, 2019
In addition to Ambrosia artemisiifolia (common ragweed), Ambrosia trifida L. (giant ragweed) is also locally present and naturalized in Serbia. Taking into account its vegetative and generative potential, its further expansion and, consequently, greater damage to agriculture can be expected.
Aleksandra Savić, Jovan Lazarević, Sava Vrbničanin   +2 more
openaire   +2 more sources

A second species of non‐crocodyliform crocodylomorph from the Late Triassic fissure deposits of southwestern UK: Implications for locomotory ecological diversity in Saltoposuchidae

The Anatomical Record, EarlyView.
Abstract The Late Triassic–Early Jurassic fissures of the Bristol Channel area (southwest England and south Wales) are renowned for their diverse vertebrate faunas. These assemblages have yielded an array of predominantly small‐bodied forms that are crucial to our understanding of the early evolution of several major tetrapod clades.
Ewan H. Bodenham, Stephan N. F. Spiekman, Susannah C. R. Maidment, Paul Upchurch, Philip D. Mannion   +4 more
wiley   +1 more source

Robust coexistence in competitive ecological communities

Nature Communications
Darwin already recognized that competition is fiercest among conspecifics, a principle that later made intraspecific competition central to ecological theory through concepts such as niche differentiation and limiting similarity.
Pablo Lechón-Alonso, Srilena Kundu, Paula Lemos-Costa, José A. Capitán, Stefano Allesina   +4 more
doaj   +1 more source

Intraspecific competition and individual behaviour but not urbanization affect the dietary patterns of a generalist avian predator

Scientific Reports, 2023
Urbanization has reshaped ecosystems and changed natural processes, driving an intense transformation of biomes, biotic community composition and diversity. Despite the growing interest in studying urban ecology over the last decades, the consequences of
Pedro Romero-Vidal, Álvaro Luna, Lola Fernández-Gómez, Joan Navarro, Antonio Palma, José L. Tella, Martina Carrete   +6 more
doaj   +1 more source

Inter‐ and intraspecific variation in theropod dinosaur dental microwear and its palaeoecological implications

The Anatomical Record, EarlyView.
Abstract Differences in skull and tooth morphology, stomach contents, and estimated bite force between medium‐to‐large sized (≥100 kg) predatory theropod dinosaurs have long been suspected to correlate with differences in their diets and dietary guilds (e.g., hypercarnivory, piscivory).
Cassius Morrison, James Gregory, Christopher Jackson, Jordan Bestwick, Katlin Schroeder, Samuel J.L. Gascoigne, Paul Bills, Laura B. Porro, Philip D. Mannion, Paul M. Barrett   +9 more
wiley   +1 more source

Quantitative muscle architecture in large carnivorous marsupials (Marsupialia: Dasyuridae) and links to substrate use and prey processing

The Anatomical Record, EarlyView.
Abstract The Dasyurid species Sarcophilus harrisii, Dasyurus maculatus, and Dasyurus viverrinus, occupying diverse ecological niches and forming a guild structure in Tasmania, provide a basis for examining the roles of various forelimb muscle groups in prey capture and locomotion.
Riya G. Bidaye, Samuel H. Frenkel, David P. Hocking, Alistair R. Evans, Justin W. Adams   +4 more
wiley   +1 more source