Notice
Dr Liliana D’Alba - Eggshell mineralization in relation to nesting ecology in reptiles
- document 1 document 2 document 3
- niveau 1 niveau 2 niveau 3
Descriptif
Egg morphologyis essential for animal survival, mediating the interactions between embryosand their environment, and a result have evolved into an enormous diversity offorms and functions in modern vertebrates. Reptiles show considerable variation in thedegree eggshell calcification, which through evolution shows a tendency toincrease. Several hypotheses have been proposed to explain the advantages ofintensified mineralization, for example that calcified eggshells increaseprotection of embryos from mechanical and biological stressors, modulate gasexchange and water physiology or that calcification might be a detoxificationmechanism. However, these hypotheses still await experimental validation.Moreover, a vast proportion of reptiles successfully reproduce based oneggshells with incipient or no calcification. Thus, the questions of why theprocess of increasing calcification of eggshells occurred or about theadvantages of shell calcification still remain. In this study I characterizedeggshell structure and chemical composition of eggshells of 96 species, andperformed comparative phylogenetic analyses to investigate the relationshipbetween life-history, nesting ecology and functional properties on theevolution of calcification of reptile eggshells. The findings show that reptile eggs display larger diversity in egg phenotypes thanpreviously thought and that this diversity is coupled with a large range offunctional properties.Calcium content is correlated with adult body size but it seems a poorpredictor of its functional performance. At a large scale, the nestingenvironment seems to play a minor role in determining the level ofmineralization of eggshells but specific nesting microclimates might lead toparticular calcification patterns. Inferences generated in this project willcontribute to increase our understanding about theimportance of reptile eggs on vertebrate evolution and diversification.
Thème
Dans la même collection
-
Dr Robbie Rae - Biological armour used to kill parasites
The co-evolution of parasites and hosts has shaped the immune system. One such ‘arms race’ is between parasitic nematodes and their molluscan hosts. One such species (Phasmarhabditis hermaphrodita)
-
Dr Frédéric Marin - Mollusk shell matrices: unexpected functions in biomineralization
To construct their skeletons, all metazoans secrete a complex array of macromolecules that are supposed to display key-functions in biomineralization, such as crystal nucleation and crystal growth
-
Dr Sophie Berland - Probing the mechanical properties and biochemical defence offered by shell matr…
Calcium carbonate is paired up with shell matrix proteins in the suited organo-mineral outer shell in molluscs. Advanced knowledge in the shell proteome is achieved with the development of
-
Dr Christine Paillard - The Brown Ring disease in clams, a double-edged defense mechanism for shell…
Brown Ring disease is caused by Vibrio tapetis, which, by adhering to newly secreted shell matrices, interferes with the biomineralization process. Colonization and alteration of the matrices induce
-
-
Dr Natalie Reznikov - Application of deep learning for segmentation of 3D images in biomineralizati…
Modern 3D imaging methods in biomineralization – such as X-ray tomography and dual-beam electron tomography – produce datasets that are rich in fine detail and enormous in size, often containing
-
Dr Claudine Blin - The innate immune function and diversity of osteoclasts
Osteoclasts are the cells responsible for bone resorption in steady state and bone destruction in chronic inflammatory diseases and osteoporosis. Up to recently, they have been considered only as
-
Prof. Maxwell Hincke - The chroriallantoic membrane: insight from proteomics.
In oviparous animals such as birds, embryonic development occurs in the egg; after oviposition, there is no further possibility of material exchange from the hen to fulfill the physiological needs
-
Dr Sophie Réhault-Godbert - The eggshell microbiome
Avian eggs possess very efficient and orchestrated systems to protect the embryo during incubation, until hatch. Although the internal components of the egg are assumed to be sterile, the surface
-
Dr Nicolas Guyot - Phylogenetic and structural evolution of egg antimicrobial proteins and peptides
The avian egg is designed to support the autonomous development of the chick embryo in the outside environment. It initially contains all the nutrients required for embryonic growth and provides
-
Dr Ian Dunn - The genetics and function of the cuticle, the eggs antimicrobial outer barrier.
Avian eggs have a proteinaceous cuticle covering the outside of the eggshell forming a barrier to the transmission of microorganisms. Although the cuticle is similar to the organic matrix, its
-
Prof. Alejandro Rodriguez Navarro - Mechanisms of eggshell biomineralization
The avian eggshell is a thin mineral layer (350 µm thick in chicken) that protects the egg content against mechanical impacts, dehydration and microorganism contamination. Eggshell formation is a
Sur le même thème
-
Voyage au coeur des déchets électroniques
Les objets électroniques ont très largement transformé nos sociétés modernes. Ils ont permis le développement d’infrastructures toujours plus complexes et connectées, promesses d’une transition
-
Du teint de porcelaine à l'addiction solaire
par Laurence Coiffard, Laboratoire de Pharmacie industrielle et de cosmétologie, MMS EA2160, Faculté de pharmacie de Nantes.
-
21 Molecular Algorithms Using Reprogrammable DNA Self-Assembly
WoodsDamienThe history of computing tells us that computers can be made of almost anything: silicon, gears and levers, neurons, flowing water, interacting particles or even light. Although lithographically
-
Dr Robbie Rae - Biological armour used to kill parasites
The co-evolution of parasites and hosts has shaped the immune system. One such ‘arms race’ is between parasitic nematodes and their molluscan hosts. One such species (Phasmarhabditis hermaphrodita)
-
Dr Christine Paillard - The Brown Ring disease in clams, a double-edged defense mechanism for shell…
Brown Ring disease is caused by Vibrio tapetis, which, by adhering to newly secreted shell matrices, interferes with the biomineralization process. Colonization and alteration of the matrices induce
-
Dr Frédéric Marin - Mollusk shell matrices: unexpected functions in biomineralization
To construct their skeletons, all metazoans secrete a complex array of macromolecules that are supposed to display key-functions in biomineralization, such as crystal nucleation and crystal growth
-
Dr Sophie Berland - Probing the mechanical properties and biochemical defence offered by shell matr…
Calcium carbonate is paired up with shell matrix proteins in the suited organo-mineral outer shell in molluscs. Advanced knowledge in the shell proteome is achieved with the development of
-
-
Dr Claudine Blin - The innate immune function and diversity of osteoclasts
Osteoclasts are the cells responsible for bone resorption in steady state and bone destruction in chronic inflammatory diseases and osteoporosis. Up to recently, they have been considered only as
-
Dr Natalie Reznikov - Application of deep learning for segmentation of 3D images in biomineralizati…
Modern 3D imaging methods in biomineralization – such as X-ray tomography and dual-beam electron tomography – produce datasets that are rich in fine detail and enormous in size, often containing
-
Dr Sophie Réhault-Godbert - The eggshell microbiome
Avian eggs possess very efficient and orchestrated systems to protect the embryo during incubation, until hatch. Although the internal components of the egg are assumed to be sterile, the surface
-
Dr Nicolas Guyot - Phylogenetic and structural evolution of egg antimicrobial proteins and peptides
The avian egg is designed to support the autonomous development of the chick embryo in the outside environment. It initially contains all the nutrients required for embryonic growth and provides
