scholarly journals Lunge feeding in early marine reptiles and fast evolution of marine tetrapod feeding guilds

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Ryosuke Motani ◽  
Xiao-hong Chen ◽  
Da-yong Jiang ◽  
Long Cheng ◽  
Andrea Tintori ◽  
...  
Keyword(s):  
Feeding Guilds ◽  
Marine Reptiles ◽  
Fast Evolution ◽  
Lunge Feeding

Mineral composition and gemological characteristics of the fossil marine reptiles of the Ulyanovsk region

2018 ◽  
pp. 12-16 ◽  
Author(s):  
D. A. Petrochenkov
Keyword(s):  
Chemical Composition ◽  
Bone Tissue ◽  
Mineral Composition ◽  
Bone Structure ◽  
Upper Jurassic ◽  
Marine Reptiles ◽  
Ulyanovsk Region ◽  
Impurity Elements ◽  
Wide Assortment

Fossils of marine reptiles are a new jewelry and ornamental material and collected in the Ulyanovsk region from the Upper Jurassic deposits. They consist of (wt. %): calcite — 52, apatite — 24 and pyrite — 23, and also gypsum presents. The contents of radioactive and carcinogenic elements are close to background. The original bone structure of reptiles is preserved. Apatite replaces the bone tissue of marine reptiles, forming a cellular framework. According to the chemical composition, apatite refers to fluorohydroxyapatite with an increased Sr content. The size of the crystals is finely-dispersed. Calcite and pyrite fill the central parts of the cells. Calcite crystals of isometric and elongated shape, 0,01—0,05 mm in size, form blocks up to 0,3 mm during intergrowth. Calcite fills thin, discontinuous veins along the contour of cells with a width of up to 0,03 mm. In calcite, among the impurity elements, there are (wt. %, on the average): Mg — 0,30, Mn — 0,39 and Fe — 0,96. Pyrite forms a dispersed impregnation in calcite and apatite, content of impurities is, wt. %: Ni — up to 0,96 and Cu — up to 0,24. On technological and decorative characteristics of fossils of sea reptiles of Ulyanovsk region are qualitative jewelry and ornamental materials of biomineral group, allowing to make a wide assortment of jewelry and souvenir products.

The large superpredators’ teeth from Middle Triassic of Poland

2013 ◽  
Vol 2 (1) ◽  
pp. 91-94 ◽  
Author(s):  
Dawid Surmik ◽  
Tomasz Brachaniec
Keyword(s):  
Marine Sediments ◽  
Middle Triassic ◽  
Morphological Features ◽  
Marine Reptiles

ABSTRACT An unusual large teeth, finding from time to time in marine sediments of Muschelkalk, Silesia, Poland indicate the superpredators occurrence. According to size and morphological features the teeth are similar to archosaurs or giant marine reptiles.

FAST RADIATION OF EARLY TRIASSIC MARINE REPTILES IN THE WAKE OF THE END-PERMIAN EXTINCTION

2017 ◽  
Author(s):  
Da-yong Jiang ◽  
◽  
Ryosuke Motani ◽  
Andrea Tintori ◽  
Zuoyu Sun ◽  
...  
Keyword(s):  
Early Triassic ◽  
Marine Reptiles ◽  
Permian Extinction

Polychaete feeding guilds from Georges Bank, USA

1981 ◽  
Vol 62 (2-3) ◽  
pp. 161-171 ◽  
Author(s):  
D. Maurer ◽  
W. Leathem
Keyword(s):  
Feeding Guilds ◽  
Georges Bank

Different kinetoplast degradation patterns in American Trypanosoma vivax strains: Multiple independent origins or fast evolution?

Genomics ◽  
2021 ◽  
Author(s):  
Gonzalo Greif ◽  
Matias Rodriguez ◽  
Ivan Bontempi ◽  
Carlos Robello ◽  
Fernando Alvarez-Valin
Keyword(s):  
Trypanosoma Vivax ◽  
Fast Evolution

scholarly journals The impact of Sosnowsky’s Hogweed on feeding guilds of birds

2021 ◽  
Author(s):  
Emilia Grzędzicka ◽  
Jiří Reif
Keyword(s):  
Negative Impact ◽  
Bird Community ◽  
Plant Invasions ◽  
Bird Communities ◽  
Feeding Guilds ◽  
Guild Structure ◽  
Feeding Guild ◽  
Potential Impact ◽  
Underlying Mechanisms ◽  
The Impact

AbstractPlant invasions alter bird community composition worldwide, but the underlying mechanisms still require exploration. The investigation of feeding guild structure of bird communities can be informative in respect to the potential impact of invasion features on the availability of food for birds. For this purpose, we focused on determining the influence of the invasive Sosnowsky’s Hogweed Heracleum sosnowskyi on the abundance of birds from various feeding guilds. In spring and summer 2019, birds were counted three times on 52 pairs of sites (control + Heracleum) in southern Poland, at various stages of Sosnowsky’s Hogweed development (i.e. sprouting, full growth and flowering, all corresponding to respective bird counts). We have shown that the presence of invader negatively affected the abundance of birds from all feeding guilds. However, a closer examination of the invaded sites uncovered that responses of particular guilds differed in respect to development stages expressed by a set of characteristics of the invader. Ground and herb insectivores were more common on plots with a higher number of the invader, while the abundance of bush and tree insectivores was negatively correlated with hogweeds’ height. Granivores were not affected by the invader’s features, while the abundance of omnivores was negatively related to the number of flowering hogweeds. Besides showing the general negative impact of the invader on different feeding guilds, our research has shown that certain aspects of Sosnowsky’s Hogweed invasion may support or depress occurrence of different birds on invaded plots. Knowledge of these aspects may facilitate our capacity for coping with challenges the invasive plants put in front of bird conservationists.

scholarly journals The Bird Assemblage of the Darwin Region (Australia): What Is the Effect of Twenty Years of Increasing Urbanisation?

Diversity ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 294
Author(s):  
Sarah E. Fischer ◽  
Andrew C. Edwards ◽  
Patrice Weber ◽  
Stephen T. Garnett ◽  
Timothy G. Whiteside
Keyword(s):  
Urban Development ◽  
Bird Community ◽  
Feeding Guilds ◽  
Australian Birds ◽  
Bird Survey ◽  
Species Analysis ◽  
Community Data ◽  
Bird Assemblage ◽  
Significant Change ◽  
The Difference

There has been considerable urban development in the Darwin region over the last twenty years; as for most fauna in Australia since colonisation, the potential effects to the bird assemblage were expected to be disastrous. To provide a broad overview of changes, bird survey data from 1998 and 2018 were extracted from BirdLife Australia’s ‘Atlas of Australian Birds’ database. A total of 165 species were categorised into primary food source feeding guilds and levels of food specialisation. This was integrated into ArcGIS along with land use change mapping from 1998 and 2018 to investigate its impact on bird assemblages. There was no significant change in overall species numbers when all sites were analysed. However, when sites were separated into those with increased urbanisation or decreased greenspace, several sites showed a significant change in the number of species. For the majority of species, analysis of primary food types found no difference in the proportion of species within the assemblages between 1998 and 2018, regardless of the level of urbanisation or greenspace; the exception being those species that primarily feed on insects, where the difference was just significant. An analysis using bird community data sorted into levels of food specialisation also found no difference between 1998 and 2018 despite habitat changes. These findings suggest that although there has been considerable urban development in the Darwin region, bird communities are remaining relatively stable.

scholarly journals Network analyses reveal the role of large snakes in connecting feeding guilds in a species‐rich Amazonian snake community

2021 ◽  
Author(s):  
Daniela Pinto‐Coelho ◽  
Marcio Martins ◽  
Paulo Roberto Guimarães Junior
Keyword(s):  
Feeding Guilds ◽  
Network Analyses
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